diff mbox series

[v7,09/15] media: bcm2835-unicam: Add support for CCP2/CSI2 camera interface

Message ID 20240324220854.15010-10-laurent.pinchart@ideasonboard.com
State Superseded
Headers show
Series media: Add driver for the Raspberry Pi <5 CSI-2 receiver | expand

Commit Message

Laurent Pinchart March 24, 2024, 10:08 p.m. UTC
From: Dave Stevenson <dave.stevenson@raspberrypi.com>

Add a driver for the Unicam camera receiver block on BCM283x processors.
It is represented as two video device nodes: unicam-image and
unicam-embedded which are connected to an internal subdev (named
unicam-subdev) in order to manage streams routing.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Co-developed-by: Naushir Patuck <naush@raspberrypi.com>
Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
Co-developed-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com>
Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com>
Co-developed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
---
Changes since v6:

- Fix typos in comments
- Drop outdated comment
- Indentation fixes
- Turn UNICAM_SD_PAD_* into an enum
- Drop unicam_format_info.metadata_fmt
- Remove unneeded dev_dbg()
- Report meta frame sizes as V4L2_FRMSIZE_TYPE_STEPWISE
- Drop stray semicolons
- Set V4L2_FMT_FLAG_META_LINE_BASED for metadata format
- Rename error label
- Use .get_mbus_config() to get number of data lanes
- Drop minimum of 3 buffers in .queue_setup()
- Merge locks for the two video nodes
- Rework start/stop to avoid race conditions

Changes since v5:

- Move to drivers/media/platform/broadcom/
- Port to the upstream V4L2 streams API
- Rebase on latest metadata API proposal
- Add missing error message
- Drop unneeded documentation block for unicam_isr()
- Drop unneeded dev_dbg() and dev_err() messages
- Drop unneeded streams_mask and fmt checks
- Drop unused unicam_sd_pad_is_sink()
- Drop unneeded includes
- Drop v4l2_ctrl_subscribe_event() call
- Use pm_runtime_resume_and_get()
- Indentation and line wrap fixes
- Let the framework set bus_info
- Use v4l2_fwnode_endpoint_parse()
- Fix media device cleanup
- Drop lane reordering checks
- Fix subdev state locking
- Drop extra debug messages
- Move clock handling to runtime PM handlers
- Reorder functions
- Rename init functions for more clarity
- Initialize runtime PM earlier
- Clarify error messages
- Simplify subdev init with local variable
- Fix subdev cleanup
- Fix typos and indentation
- Don't initialize local variables needlessly
- Simplify num lanes check
- Fix metadata handling in subdev set_fmt
- Drop manual fallback to .s_stream()
- Pass v4l2_pix_format to unicam_calc_format_size_bpl()
- Simplify unicam_set_default_format()
- Fix default format settings
- Add busy check in unicam_s_fmt_meta()
- Add missing \n at end of format strings
- Fix metadata handling in subdev set_fmt
- Fix locking when starting streaming
- Return buffers from start streaming fails
- Fix format validation for metadata node
- Use video_device_pipeline_{start,stop}() helpers
- Simplify format enumeration
- Drop unset variable
- Update MAINTAINERS entry
- Update to the upstream v4l2_async_nf API
- Update to the latest subdev routing API
- Update to the latest subdev state API
- Move from subdev .init_cfg() to .init_state()
- Update to the latest videobuf2 API
- Fix v4l2_subdev_enable_streams() error check
- Use correct pad for the connected subdev
- Return buffers to vb2 when start streaming fails
- Improve debugging in start streaming handler
- Simplify DMA address management
- Drop comment about bcm2835-camera driver
- Clarify comments that explain min/max sizes
- Pass v4l2_pix_format to unicam_try_fmt()
- Drop unneeded local variables
- Rename image-related constants and functions
- Turn unicam_fmt.metadata_fmt into bool
- Rename unicam_fmt to unicam_format_info
- Rename unicam_format_info variables to fmtinfo
- Rename unicam_node.v_fmt to fmt
- Add metadata formats for RAW10, RAW12 and RAW14
- Make metadata formats line-based
- Validate format on metadata video device
- Add Co-devlopped-by tags

Changes since v3:

- Add the vendor prefix for DT name
- Use the reg-names in DT parsing
- Remove MAINTAINERS entry

Changes since v2:

- Change code organization
- Remove unused variables
- Correct the fmt_meta functions
- Rewrite the start/stop streaming
  - You can now start the image node alone, but not the metadata one
  - The buffers are allocated per-node
  - only the required stream is started, if the route exists and is
    enabled
- Prefix the macros with UNICAM_ to not have too generic names
- Drop colorspace support

Changes since v1:

- Replace the unicam_{info,debug,error} macros with dev_*()
---
 MAINTAINERS                                   |    1 +
 drivers/media/platform/Kconfig                |    1 +
 drivers/media/platform/Makefile               |    1 +
 drivers/media/platform/broadcom/Kconfig       |   23 +
 drivers/media/platform/broadcom/Makefile      |    3 +
 .../platform/broadcom/bcm2835-unicam-regs.h   |  255 ++
 .../media/platform/broadcom/bcm2835-unicam.c  | 2667 +++++++++++++++++
 7 files changed, 2951 insertions(+)
 create mode 100644 drivers/media/platform/broadcom/Kconfig
 create mode 100644 drivers/media/platform/broadcom/Makefile
 create mode 100644 drivers/media/platform/broadcom/bcm2835-unicam-regs.h
 create mode 100644 drivers/media/platform/broadcom/bcm2835-unicam.c

Comments

Laurent Pinchart April 1, 2024, 1:52 p.m. UTC | #1
On Wed, Mar 27, 2024 at 01:21:09PM +0200, Tomi Valkeinen wrote:
> On 25/03/2024 00:08, Laurent Pinchart wrote:
> > From: Dave Stevenson <dave.stevenson@raspberrypi.com>
> > 
> > Add a driver for the Unicam camera receiver block on BCM283x processors.
> > It is represented as two video device nodes: unicam-image and
> > unicam-embedded which are connected to an internal subdev (named
> > unicam-subdev) in order to manage streams routing.
> 
> Shouldn't this driver call get_frame_desc somewhere to get the VC and DT 
> for the streams?

Generally speaking, yes. In practice, configuring the DT from the frame
descriptor is probably not very useful, as CSI-2 sources that transmit
image data using a DT that doesn't correspond to the media bus code are
not very common and I don't expect this to be needed for unicam.
Configuring the VC, on the other hand, seems to me like a better use
case. I will add get_frame_desc support for the next version.
Tomi Valkeinen April 2, 2024, 6 a.m. UTC | #2
On 01/04/2024 16:52, Laurent Pinchart wrote:
> On Wed, Mar 27, 2024 at 01:21:09PM +0200, Tomi Valkeinen wrote:
>> On 25/03/2024 00:08, Laurent Pinchart wrote:
>>> From: Dave Stevenson <dave.stevenson@raspberrypi.com>
>>>
>>> Add a driver for the Unicam camera receiver block on BCM283x processors.
>>> It is represented as two video device nodes: unicam-image and
>>> unicam-embedded which are connected to an internal subdev (named
>>> unicam-subdev) in order to manage streams routing.
>>
>> Shouldn't this driver call get_frame_desc somewhere to get the VC and DT
>> for the streams?
> 
> Generally speaking, yes. In practice, configuring the DT from the frame
> descriptor is probably not very useful, as CSI-2 sources that transmit
> image data using a DT that doesn't correspond to the media bus code are
> not very common and I don't expect this to be needed for unicam.

Perhaps, but if the driver gets the DT from the frame descriptor, then 
the driver doesn't need to have tables for the DTs.

Although when I did this with the RPi CFE driver, I also implemented a 
fallback mechanism for the cases when there is no get_frame_desc, and so 
I still had to keep the DT tables...

  Tomi
Laurent Pinchart April 2, 2024, 6:05 a.m. UTC | #3
On Tue, Apr 02, 2024 at 09:00:43AM +0300, Tomi Valkeinen wrote:
> On 01/04/2024 16:52, Laurent Pinchart wrote:
> > On Wed, Mar 27, 2024 at 01:21:09PM +0200, Tomi Valkeinen wrote:
> >> On 25/03/2024 00:08, Laurent Pinchart wrote:
> >>> From: Dave Stevenson <dave.stevenson@raspberrypi.com>
> >>>
> >>> Add a driver for the Unicam camera receiver block on BCM283x processors.
> >>> It is represented as two video device nodes: unicam-image and
> >>> unicam-embedded which are connected to an internal subdev (named
> >>> unicam-subdev) in order to manage streams routing.
> >>
> >> Shouldn't this driver call get_frame_desc somewhere to get the VC and DT
> >> for the streams?
> > 
> > Generally speaking, yes. In practice, configuring the DT from the frame
> > descriptor is probably not very useful, as CSI-2 sources that transmit
> > image data using a DT that doesn't correspond to the media bus code are
> > not very common and I don't expect this to be needed for unicam.
> 
> Perhaps, but if the driver gets the DT from the frame descriptor, then 
> the driver doesn't need to have tables for the DTs.
> 
> Although when I did this with the RPi CFE driver, I also implemented a 
> fallback mechanism for the cases when there is no get_frame_desc, and so 
> I still had to keep the DT tables...

I did the same in v9. The DT value in the existing format info table
also serves for CCP2 support, which isn't supported by
.get_frame_desc(). Even if it was, CCP2 doesn't have an explicit DT
concept (as far as I can tell), but the hardware requires the DT value
to still be programmed.
diff mbox series

Patch

diff --git a/MAINTAINERS b/MAINTAINERS
index ee7ee1ec6370..a61203ea1104 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -4040,6 +4040,7 @@  M:	Raspberry Pi Kernel Maintenance <kernel-list@raspberrypi.com>
 L:	linux-media@vger.kernel.org
 S:	Maintained
 F:	Documentation/devicetree/bindings/media/brcm,bcm2835-unicam.yaml
+F:	drivers/media/platform/bcm2835/
 
 BROADCOM BCM47XX MIPS ARCHITECTURE
 M:	Hauke Mehrtens <hauke@hauke-m.de>
diff --git a/drivers/media/platform/Kconfig b/drivers/media/platform/Kconfig
index 91e54215de3a..2d79bfc68c15 100644
--- a/drivers/media/platform/Kconfig
+++ b/drivers/media/platform/Kconfig
@@ -67,6 +67,7 @@  source "drivers/media/platform/amlogic/Kconfig"
 source "drivers/media/platform/amphion/Kconfig"
 source "drivers/media/platform/aspeed/Kconfig"
 source "drivers/media/platform/atmel/Kconfig"
+source "drivers/media/platform/broadcom/Kconfig"
 source "drivers/media/platform/cadence/Kconfig"
 source "drivers/media/platform/chips-media/Kconfig"
 source "drivers/media/platform/intel/Kconfig"
diff --git a/drivers/media/platform/Makefile b/drivers/media/platform/Makefile
index 3296ec1ebe16..da17301f7439 100644
--- a/drivers/media/platform/Makefile
+++ b/drivers/media/platform/Makefile
@@ -10,6 +10,7 @@  obj-y += amlogic/
 obj-y += amphion/
 obj-y += aspeed/
 obj-y += atmel/
+obj-y += broadcom/
 obj-y += cadence/
 obj-y += chips-media/
 obj-y += intel/
diff --git a/drivers/media/platform/broadcom/Kconfig b/drivers/media/platform/broadcom/Kconfig
new file mode 100644
index 000000000000..cc2c9afcc948
--- /dev/null
+++ b/drivers/media/platform/broadcom/Kconfig
@@ -0,0 +1,23 @@ 
+# SPDX-License-Identifier: GPL-2.0
+
+config VIDEO_BCM2835_UNICAM
+	tristate "Broadcom BCM283x/BCM271x Unicam video capture driver"
+	depends on ARCH_BCM2835 || COMPILE_TEST
+	depends on PM
+	depends on VIDEO_DEV
+	select MEDIA_CONTROLLER
+	select V4L2_FWNODE
+	select VIDEO_V4L2_SUBDEV_API
+	select VIDEOBUF2_DMA_CONTIG
+	help
+	  Say Y here to enable support for the BCM283x/BCM271x CSI-2 receiver.
+	  This is a V4L2 driver that controls the CSI-2 receiver directly,
+	  independently from the VC4 firmware.
+
+	  This driver is mutually exclusive with the use of bcm2835-camera. The
+	  firmware will disable all access to the peripheral from within the
+	  firmware if it finds a DT node using it, and bcm2835-camera will
+	  therefore fail to probe.
+
+	  To compile this driver as a module, choose M here. The module will be
+	  called bcm2835-unicam.
diff --git a/drivers/media/platform/broadcom/Makefile b/drivers/media/platform/broadcom/Makefile
new file mode 100644
index 000000000000..03d2045aba2e
--- /dev/null
+++ b/drivers/media/platform/broadcom/Makefile
@@ -0,0 +1,3 @@ 
+# SPDX-License-Identifier: GPL-2.0
+
+obj-$(CONFIG_VIDEO_BCM2835_UNICAM) += bcm2835-unicam.o
diff --git a/drivers/media/platform/broadcom/bcm2835-unicam-regs.h b/drivers/media/platform/broadcom/bcm2835-unicam-regs.h
new file mode 100644
index 000000000000..84775fd2fac5
--- /dev/null
+++ b/drivers/media/platform/broadcom/bcm2835-unicam-regs.h
@@ -0,0 +1,255 @@ 
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+/*
+ * Copyright (C) 2017-2020 Raspberry Pi Trading.
+ * Dave Stevenson <dave.stevenson@raspberrypi.com>
+ */
+
+#ifndef VC4_REGS_UNICAM_H
+#define VC4_REGS_UNICAM_H
+
+#include <linux/bits.h>
+
+/*
+ * The following values are taken from files found within the code drop
+ * made by Broadcom for the BCM21553 Graphics Driver, predominantly in
+ * brcm_usrlib/dag/vmcsx/vcinclude/hardware_vc4.h.
+ * They have been modified to be only the register offset.
+ */
+#define UNICAM_CTRL		0x000
+#define UNICAM_STA		0x004
+#define UNICAM_ANA		0x008
+#define UNICAM_PRI		0x00c
+#define UNICAM_CLK		0x010
+#define UNICAM_CLT		0x014
+#define UNICAM_DAT0		0x018
+#define UNICAM_DAT1		0x01c
+#define UNICAM_DAT2		0x020
+#define UNICAM_DAT3		0x024
+#define UNICAM_DLT		0x028
+#define UNICAM_CMP0		0x02c
+#define UNICAM_CMP1		0x030
+#define UNICAM_CAP0		0x034
+#define UNICAM_CAP1		0x038
+#define UNICAM_ICTL		0x100
+#define UNICAM_ISTA		0x104
+#define UNICAM_IDI0		0x108
+#define UNICAM_IPIPE		0x10c
+#define UNICAM_IBSA0		0x110
+#define UNICAM_IBEA0		0x114
+#define UNICAM_IBLS		0x118
+#define UNICAM_IBWP		0x11c
+#define UNICAM_IHWIN		0x120
+#define UNICAM_IHSTA		0x124
+#define UNICAM_IVWIN		0x128
+#define UNICAM_IVSTA		0x12c
+#define UNICAM_ICC		0x130
+#define UNICAM_ICS		0x134
+#define UNICAM_IDC		0x138
+#define UNICAM_IDPO		0x13c
+#define UNICAM_IDCA		0x140
+#define UNICAM_IDCD		0x144
+#define UNICAM_IDS		0x148
+#define UNICAM_DCS		0x200
+#define UNICAM_DBSA0		0x204
+#define UNICAM_DBEA0		0x208
+#define UNICAM_DBWP		0x20c
+#define UNICAM_DBCTL		0x300
+#define UNICAM_IBSA1		0x304
+#define UNICAM_IBEA1		0x308
+#define UNICAM_IDI1		0x30c
+#define UNICAM_DBSA1		0x310
+#define UNICAM_DBEA1		0x314
+#define UNICAM_MISC		0x400
+
+/*
+ * The following bitmasks are from the kernel released by Broadcom
+ * for Android - https://android.googlesource.com/kernel/bcm/
+ * The Rhea, Hawaii, and Java chips all contain the same VideoCore4
+ * Unicam block as BCM2835, as defined in eg
+ * arch/arm/mach-rhea/include/mach/rdb_A0/brcm_rdb_cam.h and similar.
+ * Values reworked to use the kernel BIT and GENMASK macros.
+ *
+ * Some of the bit mnenomics have been amended to match the datasheet.
+ */
+/* UNICAM_CTRL Register */
+#define UNICAM_CPE		BIT(0)
+#define UNICAM_MEM		BIT(1)
+#define UNICAM_CPR		BIT(2)
+#define UNICAM_CPM_MASK		GENMASK(3, 3)
+#define UNICAM_CPM_CSI2		0
+#define UNICAM_CPM_CCP2		1
+#define UNICAM_SOE		BIT(4)
+#define UNICAM_DCM_MASK		GENMASK(5, 5)
+#define UNICAM_DCM_STROBE	0
+#define UNICAM_DCM_DATA		1
+#define UNICAM_SLS		BIT(6)
+#define UNICAM_PFT_MASK		GENMASK(11, 8)
+#define UNICAM_OET_MASK		GENMASK(20, 12)
+
+/* UNICAM_STA Register */
+#define UNICAM_SYN		BIT(0)
+#define UNICAM_CS		BIT(1)
+#define UNICAM_SBE		BIT(2)
+#define UNICAM_PBE		BIT(3)
+#define UNICAM_HOE		BIT(4)
+#define UNICAM_PLE		BIT(5)
+#define UNICAM_SSC		BIT(6)
+#define UNICAM_CRCE		BIT(7)
+#define UNICAM_OES		BIT(8)
+#define UNICAM_IFO		BIT(9)
+#define UNICAM_OFO		BIT(10)
+#define UNICAM_BFO		BIT(11)
+#define UNICAM_DL		BIT(12)
+#define UNICAM_PS		BIT(13)
+#define UNICAM_IS		BIT(14)
+#define UNICAM_PI0		BIT(15)
+#define UNICAM_PI1		BIT(16)
+#define UNICAM_FSI_S		BIT(17)
+#define UNICAM_FEI_S		BIT(18)
+#define UNICAM_LCI_S		BIT(19)
+#define UNICAM_BUF0_RDY		BIT(20)
+#define UNICAM_BUF0_NO		BIT(21)
+#define UNICAM_BUF1_RDY		BIT(22)
+#define UNICAM_BUF1_NO		BIT(23)
+#define UNICAM_DI		BIT(24)
+
+#define UNICAM_STA_MASK_ALL \
+		(UNICAM_DL | \
+		UNICAM_SBE | \
+		UNICAM_PBE | \
+		UNICAM_HOE | \
+		UNICAM_PLE | \
+		UNICAM_SSC | \
+		UNICAM_CRCE | \
+		UNICAM_IFO | \
+		UNICAM_OFO | \
+		UNICAM_PS | \
+		UNICAM_PI0 | \
+		UNICAM_PI1)
+
+/* UNICAM_ANA Register */
+#define UNICAM_APD		BIT(0)
+#define UNICAM_BPD		BIT(1)
+#define UNICAM_AR		BIT(2)
+#define UNICAM_DDL		BIT(3)
+#define UNICAM_CTATADJ_MASK	GENMASK(7, 4)
+#define UNICAM_PTATADJ_MASK	GENMASK(11, 8)
+
+/* UNICAM_PRI Register */
+#define UNICAM_PE		BIT(0)
+#define UNICAM_PT_MASK		GENMASK(2, 1)
+#define UNICAM_NP_MASK		GENMASK(7, 4)
+#define UNICAM_PP_MASK		GENMASK(11, 8)
+#define UNICAM_BS_MASK		GENMASK(15, 12)
+#define UNICAM_BL_MASK		GENMASK(17, 16)
+
+/* UNICAM_CLK Register */
+#define UNICAM_CLE		BIT(0)
+#define UNICAM_CLPD		BIT(1)
+#define UNICAM_CLLPE		BIT(2)
+#define UNICAM_CLHSE		BIT(3)
+#define UNICAM_CLTRE		BIT(4)
+#define UNICAM_CLAC_MASK	GENMASK(8, 5)
+#define UNICAM_CLSTE		BIT(29)
+
+/* UNICAM_CLT Register */
+#define UNICAM_CLT1_MASK	GENMASK(7, 0)
+#define UNICAM_CLT2_MASK	GENMASK(15, 8)
+
+/* UNICAM_DATn Registers */
+#define UNICAM_DLE		BIT(0)
+#define UNICAM_DLPD		BIT(1)
+#define UNICAM_DLLPE		BIT(2)
+#define UNICAM_DLHSE		BIT(3)
+#define UNICAM_DLTRE		BIT(4)
+#define UNICAM_DLSM		BIT(5)
+#define UNICAM_DLFO		BIT(28)
+#define UNICAM_DLSTE		BIT(29)
+
+#define UNICAM_DAT_MASK_ALL	(UNICAM_DLSTE | UNICAM_DLFO)
+
+/* UNICAM_DLT Register */
+#define UNICAM_DLT1_MASK	GENMASK(7, 0)
+#define UNICAM_DLT2_MASK	GENMASK(15, 8)
+#define UNICAM_DLT3_MASK	GENMASK(23, 16)
+
+/* UNICAM_ICTL Register */
+#define UNICAM_FSIE		BIT(0)
+#define UNICAM_FEIE		BIT(1)
+#define UNICAM_IBOB		BIT(2)
+#define UNICAM_FCM		BIT(3)
+#define UNICAM_TFC		BIT(4)
+#define UNICAM_LIP_MASK		GENMASK(6, 5)
+#define UNICAM_LCIE_MASK	GENMASK(28, 16)
+
+/* UNICAM_IDI0/1 Register */
+#define UNICAM_ID0_MASK		GENMASK(7, 0)
+#define UNICAM_ID1_MASK		GENMASK(15, 8)
+#define UNICAM_ID2_MASK		GENMASK(23, 16)
+#define UNICAM_ID3_MASK		GENMASK(31, 24)
+
+/* UNICAM_ISTA Register */
+#define UNICAM_FSI		BIT(0)
+#define UNICAM_FEI		BIT(1)
+#define UNICAM_LCI		BIT(2)
+
+#define UNICAM_ISTA_MASK_ALL	(UNICAM_FSI | UNICAM_FEI | UNICAM_LCI)
+
+/* UNICAM_IPIPE Register */
+#define UNICAM_PUM_MASK		GENMASK(2, 0)
+/* Unpacking modes */
+#define UNICAM_PUM_NONE		0
+#define UNICAM_PUM_UNPACK6	1
+#define UNICAM_PUM_UNPACK7	2
+#define UNICAM_PUM_UNPACK8	3
+#define UNICAM_PUM_UNPACK10	4
+#define UNICAM_PUM_UNPACK12	5
+#define UNICAM_PUM_UNPACK14	6
+#define UNICAM_PUM_UNPACK16	7
+#define UNICAM_DDM_MASK		GENMASK(6, 3)
+#define UNICAM_PPM_MASK		GENMASK(9, 7)
+/* Packing modes */
+#define UNICAM_PPM_NONE		0
+#define UNICAM_PPM_PACK8	1
+#define UNICAM_PPM_PACK10	2
+#define UNICAM_PPM_PACK12	3
+#define UNICAM_PPM_PACK14	4
+#define UNICAM_PPM_PACK16	5
+#define UNICAM_DEM_MASK		GENMASK(11, 10)
+#define UNICAM_DEBL_MASK	GENMASK(14, 12)
+#define UNICAM_ICM_MASK		GENMASK(16, 15)
+#define UNICAM_IDM_MASK		GENMASK(17, 17)
+
+/* UNICAM_ICC Register */
+#define UNICAM_ICFL_MASK	GENMASK(4, 0)
+#define UNICAM_ICFH_MASK	GENMASK(9, 5)
+#define UNICAM_ICST_MASK	GENMASK(12, 10)
+#define UNICAM_ICLT_MASK	GENMASK(15, 13)
+#define UNICAM_ICLL_MASK	GENMASK(31, 16)
+
+/* UNICAM_DCS Register */
+#define UNICAM_DIE		BIT(0)
+#define UNICAM_DIM		BIT(1)
+#define UNICAM_DBOB		BIT(3)
+#define UNICAM_FDE		BIT(4)
+#define UNICAM_LDP		BIT(5)
+#define UNICAM_EDL_MASK		GENMASK(15, 8)
+
+/* UNICAM_DBCTL Register */
+#define UNICAM_DBEN		BIT(0)
+#define UNICAM_BUF0_IE		BIT(1)
+#define UNICAM_BUF1_IE		BIT(2)
+
+/* UNICAM_CMP[0,1] register */
+#define UNICAM_PCE		BIT(31)
+#define UNICAM_GI		BIT(9)
+#define UNICAM_CPH		BIT(8)
+#define UNICAM_PCVC_MASK	GENMASK(7, 6)
+#define UNICAM_PCDT_MASK	GENMASK(5, 0)
+
+/* UNICAM_MISC register */
+#define UNICAM_FL0		BIT(6)
+#define UNICAM_FL1		BIT(9)
+
+#endif
diff --git a/drivers/media/platform/broadcom/bcm2835-unicam.c b/drivers/media/platform/broadcom/bcm2835-unicam.c
new file mode 100644
index 000000000000..a6420e2b311d
--- /dev/null
+++ b/drivers/media/platform/broadcom/bcm2835-unicam.c
@@ -0,0 +1,2667 @@ 
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * BCM283x / BCM271x Unicam Capture Driver
+ *
+ * Copyright (C) 2017-2020 - Raspberry Pi (Trading) Ltd.
+ *
+ * Dave Stevenson <dave.stevenson@raspberrypi.com>
+ *
+ * Based on TI am437x driver by
+ *   Benoit Parrot <bparrot@ti.com>
+ *   Lad, Prabhakar <prabhakar.csengg@gmail.com>
+ *
+ * and TI CAL camera interface driver by
+ *    Benoit Parrot <bparrot@ti.com>
+ *
+ *
+ * There are two camera drivers in the kernel for BCM283x - this one and
+ * bcm2835-camera (currently in staging).
+ *
+ * This driver directly controls the Unicam peripheral - there is no
+ * involvement with the VideoCore firmware. Unicam receives CSI-2 or CCP2 data
+ * and writes it into SDRAM. The only potential processing options are to
+ * repack Bayer data into an alternate format, and applying windowing. The
+ * repacking does not shift the data, so can repack V4L2_PIX_FMT_Sxxxx10P to
+ * V4L2_PIX_FMT_Sxxxx10, or V4L2_PIX_FMT_Sxxxx12P to V4L2_PIX_FMT_Sxxxx12, but
+ * not generically up to V4L2_PIX_FMT_Sxxxx16. Support for windowing may be
+ * added later.
+ *
+ * It should be possible to connect this driver to any sensor with a suitable
+ * output interface and V4L2 subdevice driver.
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/dma-mapping.h>
+#include <linux/err.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/slab.h>
+#include <linux/videodev2.h>
+
+#include <media/v4l2-async.h>
+#include <media/v4l2-common.h>
+#include <media/v4l2-dev.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-event.h>
+#include <media/v4l2-ioctl.h>
+#include <media/v4l2-fwnode.h>
+#include <media/v4l2-mc.h>
+#include <media/videobuf2-dma-contig.h>
+
+#include "bcm2835-unicam-regs.h"
+
+#define UNICAM_MODULE_NAME		"unicam"
+
+/*
+ * Unicam must request a minimum of 250Mhz from the VPU clock.
+ * Otherwise the input FIFOs overrun and cause image corruption.
+ */
+#define UNICAM_MIN_VPU_CLOCK_RATE	(250 * 1000 * 1000)
+
+/* Unicam has an internal DMA alignment constraint of 16 bytes for each line. */
+#define UNICAM_DMA_BPL_ALIGNMENT	16
+
+/*
+ * The image stride is stored in a 16 bit register, and needs to be aligned to
+ * the DMA constraint. As the ISP in the same SoC has a 32 bytes alignment
+ * constraint on its input, set the image stride alignment to 32 bytes here as
+ * well to avoid incompatible configurations.
+ */
+#define UNICAM_IMAGE_BPL_ALIGNMENT	32
+#define UNICAM_IMAGE_MAX_BPL		((1 << 16) - UNICAM_IMAGE_BPL_ALIGNMENT)
+
+/*
+ * Max width is therefore determined by the max stride divided by the number of
+ * bits per pixel. Take 32bpp as a worst case. No imposed limit on the height,
+ * so adopt a square image for want of anything better.
+ */
+#define UNICAM_IMAGE_MIN_WIDTH		16
+#define UNICAM_IMAGE_MIN_HEIGHT		16
+#define UNICAM_IMAGE_MAX_WIDTH		(UNICAM_IMAGE_MAX_BPL / 4)
+#define UNICAM_IMAGE_MAX_HEIGHT		UNICAM_IMAGE_MAX_WIDTH
+
+/*
+ * There's no intrinsic limits on the width and height for embedded data. Use
+ * the same maximum values as for the image, to avoid overflows in the image
+ * size computation.
+ */
+#define UNICAM_META_MIN_WIDTH		1
+#define UNICAM_META_MIN_HEIGHT		1
+#define UNICAM_META_MAX_WIDTH		UNICAM_IMAGE_MAX_WIDTH
+#define UNICAM_META_MAX_HEIGHT		UNICAM_IMAGE_MAX_HEIGHT
+
+/*
+ * Size of the dummy buffer. Can be any size really, but the DMA
+ * allocation works in units of page sizes.
+ */
+#define UNICAM_DUMMY_BUF_SIZE		PAGE_SIZE
+
+enum unicam_pad {
+	UNICAM_SD_PAD_SINK,
+	UNICAM_SD_PAD_SOURCE_IMAGE,
+	UNICAM_SD_PAD_SOURCE_METADATA,
+	UNICAM_SD_NUM_PADS
+};
+
+enum unicam_node_type {
+	UNICAM_IMAGE_NODE,
+	UNICAM_METADATA_NODE,
+	UNICAM_MAX_NODES
+};
+
+/*
+ * struct unicam_format_info - Unicam media bus format information
+ * @fourcc: V4L2 pixel format FCC identifier. 0 if n/a.
+ * @unpacked_fourcc: V4L2 pixel format FCC identifier if the data is expanded
+ * out to 16bpp. 0 if n/a.
+ * @code: V4L2 media bus format code.
+ * @depth: Bits per pixel as delivered from the source.
+ * @csi_dt: CSI data type.
+ */
+struct unicam_format_info {
+	u32	fourcc;
+	u32	unpacked_fourcc;
+	u32	code;
+	u8	depth;
+	u8	csi_dt;
+};
+
+struct unicam_buffer {
+	struct vb2_v4l2_buffer vb;
+	struct list_head list;
+	dma_addr_t dma_addr;
+	unsigned int size;
+};
+
+static inline struct unicam_buffer *to_unicam_buffer(struct vb2_buffer *vb)
+{
+	return container_of(vb, struct unicam_buffer, vb.vb2_buf);
+}
+
+struct unicam_node {
+	bool registered;
+	bool streaming;
+	unsigned int id;
+
+	/* Pointer to the current v4l2_buffer */
+	struct unicam_buffer *cur_frm;
+	/* Pointer to the next v4l2_buffer */
+	struct unicam_buffer *next_frm;
+	/* video capture */
+	const struct unicam_format_info *fmtinfo;
+	/* Used to store current pixel format */
+	struct v4l2_format fmt;
+	/* Buffer queue used in video-buf */
+	struct vb2_queue buffer_queue;
+	/* Queue of filled frames */
+	struct list_head dma_queue;
+	/* IRQ lock for DMA queue */
+	spinlock_t dma_queue_lock;
+	/* Identifies video device for this channel */
+	struct video_device video_dev;
+	/* Pointer to the parent handle */
+	struct unicam_device *dev;
+	struct media_pad pad;
+	/*
+	 * Dummy buffer intended to be used by unicam
+	 * if we have no other queued buffers to swap to.
+	 */
+	struct unicam_buffer dummy_buf;
+	void *dummy_buf_cpu_addr;
+};
+
+struct unicam_device {
+	struct kref kref;
+
+	/* peripheral base address */
+	void __iomem *base;
+	/* clock gating base address */
+	void __iomem *clk_gate_base;
+	/* lp clock handle */
+	struct clk *clock;
+	/* vpu clock handle */
+	struct clk *vpu_clock;
+	/* V4l2 device */
+	struct v4l2_device v4l2_dev;
+	struct media_device mdev;
+
+	/* parent device */
+	struct device *dev;
+	/* subdevice async notifier */
+	struct v4l2_async_notifier notifier;
+	unsigned int sequence;
+
+	/* Sensor node */
+	struct {
+		struct v4l2_subdev *subdev;
+		struct media_pad *pad;
+	} sensor;
+
+	/* Internal subdev */
+	struct {
+		struct v4l2_subdev sd;
+		struct media_pad pads[UNICAM_SD_NUM_PADS];
+		unsigned int enabled_streams;
+	} subdev;
+
+	enum v4l2_mbus_type bus_type;
+	/*
+	 * Stores bus.mipi_csi2.flags for CSI2 sensors, or
+	 * bus.mipi_csi1.strobe for CCP2.
+	 */
+	unsigned int bus_flags;
+	unsigned int max_data_lanes;
+
+	struct {
+		struct media_pipeline pipe;
+		unsigned int num_data_lanes;
+		unsigned int nodes;
+	} pipe;
+
+	/* Lock used for the video devices of both nodes */
+	struct mutex lock;
+	struct unicam_node node[UNICAM_MAX_NODES];
+};
+
+static inline struct unicam_device *
+notifier_to_unicam_device(struct v4l2_async_notifier *notifier)
+{
+	return container_of(notifier, struct unicam_device, notifier);
+}
+
+static inline struct unicam_device *
+sd_to_unicam_device(struct v4l2_subdev *sd)
+{
+	return container_of(sd, struct unicam_device, subdev.sd);
+}
+
+static void unicam_release(struct kref *kref)
+{
+	struct unicam_device *unicam =
+		container_of(kref, struct unicam_device, kref);
+
+	if (unicam->mdev.dev)
+		media_device_cleanup(&unicam->mdev);
+
+	mutex_destroy(&unicam->lock);
+	kfree(unicam);
+}
+
+static struct unicam_device *unicam_get(struct unicam_device *unicam)
+{
+	kref_get(&unicam->kref);
+	return unicam;
+}
+
+static void unicam_put(struct unicam_device *unicam)
+{
+	kref_put(&unicam->kref, unicam_release);
+}
+
+/* -----------------------------------------------------------------------------
+ * Misc helper functions
+ */
+
+static inline bool unicam_sd_pad_is_source(u32 pad)
+{
+	/* Camera RX has 1 sink pad, and N source pads */
+	return pad != UNICAM_SD_PAD_SINK;
+}
+
+static inline bool is_metadata_node(struct unicam_node *node)
+{
+	return node->video_dev.device_caps & V4L2_CAP_META_CAPTURE;
+}
+
+static inline bool is_image_node(struct unicam_node *node)
+{
+	return node->video_dev.device_caps & V4L2_CAP_VIDEO_CAPTURE;
+}
+
+/* -----------------------------------------------------------------------------
+ * Format data table and helper functions
+ */
+
+static const struct v4l2_mbus_framefmt unicam_default_image_format = {
+	.width = 640,
+	.height = 480,
+	.code = MEDIA_BUS_FMT_UYVY8_1X16,
+	.field = V4L2_FIELD_NONE,
+	.colorspace = V4L2_COLORSPACE_SRGB,
+	.ycbcr_enc = V4L2_YCBCR_ENC_601,
+	.quantization = V4L2_QUANTIZATION_LIM_RANGE,
+	.xfer_func = V4L2_XFER_FUNC_SRGB,
+	.flags = 0,
+};
+
+static const struct v4l2_mbus_framefmt unicam_default_meta_format = {
+	.width = 640,
+	.height = 2,
+	.code = MEDIA_BUS_FMT_META_8,
+	.field = V4L2_FIELD_NONE,
+};
+
+static const struct unicam_format_info unicam_image_formats[] = {
+	/* YUV Formats */
+	{
+		.fourcc		= V4L2_PIX_FMT_YUYV,
+		.code		= MEDIA_BUS_FMT_YUYV8_1X16,
+		.depth		= 16,
+		.csi_dt		= 0x1e,
+	}, {
+		.fourcc		= V4L2_PIX_FMT_UYVY,
+		.code		= MEDIA_BUS_FMT_UYVY8_1X16,
+		.depth		= 16,
+		.csi_dt		= 0x1e,
+	}, {
+		.fourcc		= V4L2_PIX_FMT_YVYU,
+		.code		= MEDIA_BUS_FMT_YVYU8_1X16,
+		.depth		= 16,
+		.csi_dt		= 0x1e,
+	}, {
+		.fourcc		= V4L2_PIX_FMT_VYUY,
+		.code		= MEDIA_BUS_FMT_VYUY8_1X16,
+		.depth		= 16,
+		.csi_dt		= 0x1e,
+	}, {
+	/* RGB Formats */
+		.fourcc		= V4L2_PIX_FMT_RGB565, /* gggbbbbb rrrrrggg */
+		.code		= MEDIA_BUS_FMT_RGB565_1X16,
+		.depth		= 16,
+		.csi_dt		= 0x22,
+	}, {
+		.fourcc		= V4L2_PIX_FMT_RGB24, /* rgb */
+		.code		= MEDIA_BUS_FMT_RGB888_1X24,
+		.depth		= 24,
+		.csi_dt		= 0x24,
+	}, {
+		.fourcc		= V4L2_PIX_FMT_BGR24, /* bgr */
+		.code		= MEDIA_BUS_FMT_BGR888_1X24,
+		.depth		= 24,
+		.csi_dt		= 0x24,
+	}, {
+	/* Bayer Formats */
+		.fourcc		= V4L2_PIX_FMT_SBGGR8,
+		.code		= MEDIA_BUS_FMT_SBGGR8_1X8,
+		.depth		= 8,
+		.csi_dt		= 0x2a,
+	}, {
+		.fourcc		= V4L2_PIX_FMT_SGBRG8,
+		.code		= MEDIA_BUS_FMT_SGBRG8_1X8,
+		.depth		= 8,
+		.csi_dt		= 0x2a,
+	}, {
+		.fourcc		= V4L2_PIX_FMT_SGRBG8,
+		.code		= MEDIA_BUS_FMT_SGRBG8_1X8,
+		.depth		= 8,
+		.csi_dt		= 0x2a,
+	}, {
+		.fourcc		= V4L2_PIX_FMT_SRGGB8,
+		.code		= MEDIA_BUS_FMT_SRGGB8_1X8,
+		.depth		= 8,
+		.csi_dt		= 0x2a,
+	}, {
+		.fourcc		= V4L2_PIX_FMT_SBGGR10P,
+		.unpacked_fourcc = V4L2_PIX_FMT_SBGGR10,
+		.code		= MEDIA_BUS_FMT_SBGGR10_1X10,
+		.depth		= 10,
+		.csi_dt		= 0x2b,
+	}, {
+		.fourcc		= V4L2_PIX_FMT_SGBRG10P,
+		.unpacked_fourcc = V4L2_PIX_FMT_SGBRG10,
+		.code		= MEDIA_BUS_FMT_SGBRG10_1X10,
+		.depth		= 10,
+		.csi_dt		= 0x2b,
+	}, {
+		.fourcc		= V4L2_PIX_FMT_SGRBG10P,
+		.unpacked_fourcc = V4L2_PIX_FMT_SGRBG10,
+		.code		= MEDIA_BUS_FMT_SGRBG10_1X10,
+		.depth		= 10,
+		.csi_dt		= 0x2b,
+	}, {
+		.fourcc		= V4L2_PIX_FMT_SRGGB10P,
+		.unpacked_fourcc = V4L2_PIX_FMT_SRGGB10,
+		.code		= MEDIA_BUS_FMT_SRGGB10_1X10,
+		.depth		= 10,
+		.csi_dt		= 0x2b,
+	}, {
+		.fourcc		= V4L2_PIX_FMT_SBGGR12P,
+		.unpacked_fourcc = V4L2_PIX_FMT_SBGGR12,
+		.code		= MEDIA_BUS_FMT_SBGGR12_1X12,
+		.depth		= 12,
+		.csi_dt		= 0x2c,
+	}, {
+		.fourcc		= V4L2_PIX_FMT_SGBRG12P,
+		.unpacked_fourcc = V4L2_PIX_FMT_SGBRG12,
+		.code		= MEDIA_BUS_FMT_SGBRG12_1X12,
+		.depth		= 12,
+		.csi_dt		= 0x2c,
+	}, {
+		.fourcc		= V4L2_PIX_FMT_SGRBG12P,
+		.unpacked_fourcc = V4L2_PIX_FMT_SGRBG12,
+		.code		= MEDIA_BUS_FMT_SGRBG12_1X12,
+		.depth		= 12,
+		.csi_dt		= 0x2c,
+	}, {
+		.fourcc		= V4L2_PIX_FMT_SRGGB12P,
+		.unpacked_fourcc = V4L2_PIX_FMT_SRGGB12,
+		.code		= MEDIA_BUS_FMT_SRGGB12_1X12,
+		.depth		= 12,
+		.csi_dt		= 0x2c,
+	}, {
+		.fourcc		= V4L2_PIX_FMT_SBGGR14P,
+		.unpacked_fourcc = V4L2_PIX_FMT_SBGGR14,
+		.code		= MEDIA_BUS_FMT_SBGGR14_1X14,
+		.depth		= 14,
+		.csi_dt		= 0x2d,
+	}, {
+		.fourcc		= V4L2_PIX_FMT_SGBRG14P,
+		.unpacked_fourcc = V4L2_PIX_FMT_SGBRG14,
+		.code		= MEDIA_BUS_FMT_SGBRG14_1X14,
+		.depth		= 14,
+		.csi_dt		= 0x2d,
+	}, {
+		.fourcc		= V4L2_PIX_FMT_SGRBG14P,
+		.unpacked_fourcc = V4L2_PIX_FMT_SGRBG14,
+		.code		= MEDIA_BUS_FMT_SGRBG14_1X14,
+		.depth		= 14,
+		.csi_dt		= 0x2d,
+	}, {
+		.fourcc		= V4L2_PIX_FMT_SRGGB14P,
+		.unpacked_fourcc = V4L2_PIX_FMT_SRGGB14,
+		.code		= MEDIA_BUS_FMT_SRGGB14_1X14,
+		.depth		= 14,
+		.csi_dt		= 0x2d,
+	}, {
+	/* 16 bit Bayer formats could be supported. */
+
+	/* Greyscale formats */
+		.fourcc		= V4L2_PIX_FMT_GREY,
+		.code		= MEDIA_BUS_FMT_Y8_1X8,
+		.depth		= 8,
+		.csi_dt		= 0x2a,
+	}, {
+		.fourcc		= V4L2_PIX_FMT_Y10P,
+		.unpacked_fourcc = V4L2_PIX_FMT_Y10,
+		.code		= MEDIA_BUS_FMT_Y10_1X10,
+		.depth		= 10,
+		.csi_dt		= 0x2b,
+	}, {
+		.fourcc		= V4L2_PIX_FMT_Y12P,
+		.unpacked_fourcc = V4L2_PIX_FMT_Y12,
+		.code		= MEDIA_BUS_FMT_Y12_1X12,
+		.depth		= 12,
+		.csi_dt		= 0x2c,
+	}, {
+		.fourcc		= V4L2_PIX_FMT_Y14P,
+		.unpacked_fourcc = V4L2_PIX_FMT_Y14,
+		.code		= MEDIA_BUS_FMT_Y14_1X14,
+		.depth		= 14,
+		.csi_dt		= 0x2d,
+	},
+};
+
+static const struct unicam_format_info unicam_meta_formats[] = {
+	{
+		.fourcc		= V4L2_META_FMT_GENERIC_8,
+		.code		= MEDIA_BUS_FMT_META_8,
+		.depth		= 8,
+	}, {
+		.fourcc		= V4L2_META_FMT_GENERIC_CSI2_10,
+		.code		= MEDIA_BUS_FMT_META_10,
+		.depth		= 10,
+	}, {
+		.fourcc		= V4L2_META_FMT_GENERIC_CSI2_12,
+		.code		= MEDIA_BUS_FMT_META_12,
+		.depth		= 12,
+	}, {
+		.fourcc		= V4L2_META_FMT_GENERIC_CSI2_14,
+		.code		= MEDIA_BUS_FMT_META_14,
+		.depth		= 14,
+	},
+};
+
+/* Format setup functions */
+static const struct unicam_format_info *
+unicam_find_format_by_code(u32 code, u32 pad)
+{
+	const struct unicam_format_info *formats;
+	unsigned int num_formats;
+	unsigned int i;
+
+	if (pad == UNICAM_SD_PAD_SOURCE_IMAGE) {
+		formats = unicam_image_formats;
+		num_formats = ARRAY_SIZE(unicam_image_formats);
+	} else {
+		formats = unicam_meta_formats;
+		num_formats = ARRAY_SIZE(unicam_meta_formats);
+	}
+
+	for (i = 0; i < num_formats; i++) {
+		if (formats[i].code == code)
+			return &formats[i];
+	}
+
+	return NULL;
+}
+
+static const struct unicam_format_info *
+unicam_find_format_by_fourcc(u32 fourcc, u32 pad)
+{
+	const struct unicam_format_info *formats;
+	unsigned int num_formats;
+	unsigned int i;
+
+	if (pad == UNICAM_SD_PAD_SOURCE_IMAGE) {
+		formats = unicam_image_formats;
+		num_formats = ARRAY_SIZE(unicam_image_formats);
+	} else {
+		formats = unicam_meta_formats;
+		num_formats = ARRAY_SIZE(unicam_meta_formats);
+	}
+
+	for (i = 0; i < num_formats; ++i) {
+		if (formats[i].fourcc == fourcc)
+			return &formats[i];
+	}
+
+	return NULL;
+}
+
+static void unicam_calc_image_size_bpl(struct unicam_device *unicam,
+				       const struct unicam_format_info *fmtinfo,
+				       struct v4l2_pix_format *pix)
+{
+	u32 min_bpl;
+
+	v4l_bound_align_image(&pix->width, UNICAM_IMAGE_MIN_WIDTH,
+			      UNICAM_IMAGE_MAX_WIDTH, 2,
+			      &pix->height, UNICAM_IMAGE_MIN_HEIGHT,
+			      UNICAM_IMAGE_MAX_HEIGHT, 0, 0);
+
+	/* Unpacking always goes to 16bpp */
+	if (pix->pixelformat == fmtinfo->unpacked_fourcc)
+		min_bpl = pix->width * 2;
+	else
+		min_bpl = pix->width * fmtinfo->depth / 8;
+	min_bpl = ALIGN(min_bpl, UNICAM_IMAGE_BPL_ALIGNMENT);
+
+	pix->bytesperline = ALIGN(pix->bytesperline, UNICAM_IMAGE_BPL_ALIGNMENT);
+	pix->bytesperline = clamp_t(unsigned int, pix->bytesperline, min_bpl,
+				    UNICAM_IMAGE_MAX_BPL);
+
+	pix->sizeimage = pix->height * pix->bytesperline;
+}
+
+static void unicam_calc_meta_size_bpl(struct unicam_device *unicam,
+				      const struct unicam_format_info *fmtinfo,
+				      struct v4l2_meta_format *meta)
+{
+	v4l_bound_align_image(&meta->width, UNICAM_META_MIN_WIDTH,
+			      UNICAM_META_MAX_WIDTH, 0,
+			      &meta->height, UNICAM_META_MIN_HEIGHT,
+			      UNICAM_META_MAX_HEIGHT, 0, 0);
+
+	meta->bytesperline = ALIGN(meta->width * fmtinfo->depth / 8,
+				   UNICAM_DMA_BPL_ALIGNMENT);
+	meta->buffersize = meta->height * meta->bytesperline;
+}
+
+/* -----------------------------------------------------------------------------
+ * Hardware handling
+ */
+
+static inline void unicam_clk_write(struct unicam_device *unicam, u32 val)
+{
+	/* Pass the CM_PASSWORD along with the value. */
+	writel(val | 0x5a000000, unicam->clk_gate_base);
+}
+
+static inline u32 unicam_reg_read(struct unicam_device *unicam, u32 offset)
+{
+	return readl(unicam->base + offset);
+}
+
+static inline void unicam_reg_write(struct unicam_device *unicam, u32 offset, u32 val)
+{
+	writel(val, unicam->base + offset);
+}
+
+static inline int unicam_get_field(u32 value, u32 mask)
+{
+	return (value & mask) >> __ffs(mask);
+}
+
+static inline void unicam_set_field(u32 *valp, u32 field, u32 mask)
+{
+	u32 val = *valp;
+
+	val &= ~mask;
+	val |= (field << __ffs(mask)) & mask;
+	*valp = val;
+}
+
+static inline void unicam_reg_write_field(struct unicam_device *unicam, u32 offset,
+					  u32 field, u32 mask)
+{
+	u32 val = unicam_reg_read(unicam, offset);
+
+	unicam_set_field(&val, field, mask);
+	unicam_reg_write(unicam, offset, val);
+}
+
+static void unicam_wr_dma_addr(struct unicam_node *node,
+			       struct unicam_buffer *buf)
+{
+	dma_addr_t endaddr = buf->dma_addr + buf->size;
+
+	if (node->id == UNICAM_IMAGE_NODE) {
+		unicam_reg_write(node->dev, UNICAM_IBSA0, buf->dma_addr);
+		unicam_reg_write(node->dev, UNICAM_IBEA0, endaddr);
+	} else {
+		unicam_reg_write(node->dev, UNICAM_DBSA0, buf->dma_addr);
+		unicam_reg_write(node->dev, UNICAM_DBEA0, endaddr);
+	}
+}
+
+static unsigned int unicam_get_lines_done(struct unicam_device *unicam)
+{
+	struct unicam_node *node = &unicam->node[UNICAM_IMAGE_NODE];
+	unsigned int stride = node->fmt.fmt.pix.bytesperline;
+	struct unicam_buffer *frm = node->cur_frm;
+	dma_addr_t cur_addr;
+
+	if (!frm)
+		return 0;
+
+	cur_addr = unicam_reg_read(unicam, UNICAM_IBWP);
+	return (unsigned int)(cur_addr - frm->dma_addr) / stride;
+}
+
+static void unicam_schedule_next_buffer(struct unicam_node *node)
+{
+	struct unicam_buffer *buf;
+
+	buf = list_first_entry(&node->dma_queue, struct unicam_buffer, list);
+	node->next_frm = buf;
+	list_del(&buf->list);
+
+	unicam_wr_dma_addr(node, buf);
+}
+
+static void unicam_schedule_dummy_buffer(struct unicam_node *node)
+{
+	int node_id = is_image_node(node) ? UNICAM_IMAGE_NODE : UNICAM_METADATA_NODE;
+
+	dev_dbg(node->dev->dev, "Scheduling dummy buffer for node %d\n", node_id);
+
+	unicam_wr_dma_addr(node, &node->dummy_buf);
+
+	node->next_frm = NULL;
+}
+
+static void unicam_process_buffer_complete(struct unicam_node *node,
+					   unsigned int sequence)
+{
+	node->cur_frm->vb.field = node->fmt.fmt.pix.field;
+	node->cur_frm->vb.sequence = sequence;
+
+	vb2_buffer_done(&node->cur_frm->vb.vb2_buf, VB2_BUF_STATE_DONE);
+}
+
+static void unicam_queue_event_sof(struct unicam_device *unicam)
+{
+	struct unicam_node *node = &unicam->node[UNICAM_IMAGE_NODE];
+
+	struct v4l2_event event = {
+		.type = V4L2_EVENT_FRAME_SYNC,
+		.u.frame_sync.frame_sequence = unicam->sequence,
+	};
+
+	v4l2_event_queue(&node->video_dev, &event);
+}
+
+static irqreturn_t unicam_isr(int irq, void *dev)
+{
+	struct unicam_device *unicam = dev;
+	unsigned int lines_done = unicam_get_lines_done(dev);
+	unsigned int sequence = unicam->sequence;
+	unsigned int i;
+	u32 ista, sta;
+	bool fe;
+	u64 ts;
+
+	sta = unicam_reg_read(unicam, UNICAM_STA);
+	/* Write value back to clear the interrupts */
+	unicam_reg_write(unicam, UNICAM_STA, sta);
+
+	ista = unicam_reg_read(unicam, UNICAM_ISTA);
+	/* Write value back to clear the interrupts */
+	unicam_reg_write(unicam, UNICAM_ISTA, ista);
+
+	dev_dbg(unicam->dev, "ISR: ISTA: 0x%X, STA: 0x%X, sequence %d, lines done %d\n",
+		ista, sta, sequence, lines_done);
+
+	if (!(sta & (UNICAM_IS | UNICAM_PI0)))
+		return IRQ_HANDLED;
+
+	/*
+	 * Look for either the Frame End interrupt or the Packet Capture status
+	 * to signal a frame end.
+	 */
+	fe = ista & UNICAM_FEI || sta & UNICAM_PI0;
+
+	/*
+	 * We must run the frame end handler first. If we have a valid next_frm
+	 * and we get a simultaneout FE + FS interrupt, running the FS handler
+	 * first would null out the next_frm ptr and we would have lost the
+	 * buffer forever.
+	 */
+	if (fe) {
+		/*
+		 * Ensure we have swapped buffers already as we can't
+		 * stop the peripheral. If no buffer is available, use a
+		 * dummy buffer to dump out frames until we get a new buffer
+		 * to use.
+		 */
+		for (i = 0; i < ARRAY_SIZE(unicam->node); i++) {
+			if (!unicam->node[i].streaming)
+				continue;
+
+			/*
+			 * If cur_frm == next_frm, it means we have not had
+			 * a chance to swap buffers, likely due to having
+			 * multiple interrupts occurring simultaneously (like FE
+			 * + FS + LS). In this case, we cannot signal the buffer
+			 * as complete, as the HW will reuse that buffer.
+			 */
+			if (unicam->node[i].cur_frm &&
+			    unicam->node[i].cur_frm != unicam->node[i].next_frm)
+				unicam_process_buffer_complete(&unicam->node[i],
+							       sequence);
+			unicam->node[i].cur_frm = unicam->node[i].next_frm;
+		}
+		unicam->sequence++;
+	}
+
+	if (ista & UNICAM_FSI) {
+		/*
+		 * Timestamp is to be when the first data byte was captured,
+		 * aka frame start.
+		 */
+		ts = ktime_get_ns();
+		for (i = 0; i < ARRAY_SIZE(unicam->node); i++) {
+			if (!unicam->node[i].streaming)
+				continue;
+
+			if (unicam->node[i].cur_frm)
+				unicam->node[i].cur_frm->vb.vb2_buf.timestamp =
+								ts;
+			else
+				dev_dbg(unicam->v4l2_dev.dev,
+					"ISR: [%d] Dropping frame, buffer not available at FS\n",
+					i);
+			/*
+			 * Set the next frame output to go to a dummy frame
+			 * if we have not managed to obtain another frame
+			 * from the queue.
+			 */
+			unicam_schedule_dummy_buffer(&unicam->node[i]);
+		}
+
+		unicam_queue_event_sof(unicam);
+	}
+
+	/*
+	 * Cannot swap buffer at frame end, there may be a race condition
+	 * where the HW does not actually swap it if the new frame has
+	 * already started.
+	 */
+	if (ista & (UNICAM_FSI | UNICAM_LCI) && !fe) {
+		for (i = 0; i < ARRAY_SIZE(unicam->node); i++) {
+			if (!unicam->node[i].streaming)
+				continue;
+
+			spin_lock(&unicam->node[i].dma_queue_lock);
+			if (!list_empty(&unicam->node[i].dma_queue) &&
+			    !unicam->node[i].next_frm)
+				unicam_schedule_next_buffer(&unicam->node[i]);
+			spin_unlock(&unicam->node[i].dma_queue_lock);
+		}
+	}
+
+	if (unicam_reg_read(unicam, UNICAM_ICTL) & UNICAM_FCM) {
+		/* Switch out of trigger mode if selected */
+		unicam_reg_write_field(unicam, UNICAM_ICTL, 1, UNICAM_TFC);
+		unicam_reg_write_field(unicam, UNICAM_ICTL, 0, UNICAM_FCM);
+	}
+	return IRQ_HANDLED;
+}
+
+static void unicam_set_packing_config(struct unicam_device *unicam)
+{
+	struct unicam_node *node = &unicam->node[UNICAM_IMAGE_NODE];
+	u32 pack, unpack;
+	u32 val;
+
+	if (node->fmt.fmt.pix.pixelformat == node->fmtinfo->fourcc) {
+		unpack = UNICAM_PUM_NONE;
+		pack = UNICAM_PPM_NONE;
+	} else {
+		switch (node->fmtinfo->depth) {
+		case 8:
+			unpack = UNICAM_PUM_UNPACK8;
+			break;
+		case 10:
+			unpack = UNICAM_PUM_UNPACK10;
+			break;
+		case 12:
+			unpack = UNICAM_PUM_UNPACK12;
+			break;
+		case 14:
+			unpack = UNICAM_PUM_UNPACK14;
+			break;
+		case 16:
+			unpack = UNICAM_PUM_UNPACK16;
+			break;
+		default:
+			unpack = UNICAM_PUM_NONE;
+			break;
+		}
+
+		/* Repacking is always to 16bpp */
+		pack = UNICAM_PPM_PACK16;
+	}
+
+	val = 0;
+	unicam_set_field(&val, unpack, UNICAM_PUM_MASK);
+	unicam_set_field(&val, pack, UNICAM_PPM_MASK);
+	unicam_reg_write(unicam, UNICAM_IPIPE, val);
+}
+
+static void unicam_cfg_image_id(struct unicam_device *unicam)
+{
+	struct unicam_node *node = &unicam->node[UNICAM_IMAGE_NODE];
+
+	if (unicam->bus_type == V4L2_MBUS_CSI2_DPHY) {
+		/* CSI2 mode, hardcode VC 0 for now. */
+		unicam_reg_write(unicam, UNICAM_IDI0,
+				 (0 << 6) | node->fmtinfo->csi_dt);
+	} else {
+		/* CCP2 mode */
+		unicam_reg_write(unicam, UNICAM_IDI0,
+				 0x80 | node->fmtinfo->csi_dt);
+	}
+}
+
+static void unicam_enable_ed(struct unicam_device *unicam)
+{
+	u32 val = unicam_reg_read(unicam, UNICAM_DCS);
+
+	unicam_set_field(&val, 2, UNICAM_EDL_MASK);
+	/* Do not wrap at the end of the embedded data buffer */
+	unicam_set_field(&val, 0, UNICAM_DBOB);
+
+	unicam_reg_write(unicam, UNICAM_DCS, val);
+}
+
+static void unicam_start_rx(struct unicam_device *unicam)
+{
+	struct unicam_node *node = &unicam->node[UNICAM_IMAGE_NODE];
+	int line_int_freq = node->fmt.fmt.pix.height >> 2;
+	unsigned int i;
+	u32 val;
+
+	if (line_int_freq < 128)
+		line_int_freq = 128;
+
+	/* Enable lane clocks */
+	val = 1;
+	for (i = 0; i < unicam->pipe.num_data_lanes; i++)
+		val = val << 2 | 1;
+	unicam_clk_write(unicam, val);
+
+	/* Basic init */
+	unicam_reg_write(unicam, UNICAM_CTRL, UNICAM_MEM);
+
+	/* Enable analogue control, and leave in reset. */
+	val = UNICAM_AR;
+	unicam_set_field(&val, 7, UNICAM_CTATADJ_MASK);
+	unicam_set_field(&val, 7, UNICAM_PTATADJ_MASK);
+	unicam_reg_write(unicam, UNICAM_ANA, val);
+	usleep_range(1000, 2000);
+
+	/* Come out of reset */
+	unicam_reg_write_field(unicam, UNICAM_ANA, 0, UNICAM_AR);
+
+	/* Peripheral reset */
+	unicam_reg_write_field(unicam, UNICAM_CTRL, 1, UNICAM_CPR);
+	unicam_reg_write_field(unicam, UNICAM_CTRL, 0, UNICAM_CPR);
+
+	unicam_reg_write_field(unicam, UNICAM_CTRL, 0, UNICAM_CPE);
+
+	/* Enable Rx control. */
+	val = unicam_reg_read(unicam, UNICAM_CTRL);
+	if (unicam->bus_type == V4L2_MBUS_CSI2_DPHY) {
+		unicam_set_field(&val, UNICAM_CPM_CSI2, UNICAM_CPM_MASK);
+		unicam_set_field(&val, UNICAM_DCM_STROBE, UNICAM_DCM_MASK);
+	} else {
+		unicam_set_field(&val, UNICAM_CPM_CCP2, UNICAM_CPM_MASK);
+		unicam_set_field(&val, unicam->bus_flags, UNICAM_DCM_MASK);
+	}
+	/* Packet framer timeout */
+	unicam_set_field(&val, 0xf, UNICAM_PFT_MASK);
+	unicam_set_field(&val, 128, UNICAM_OET_MASK);
+	unicam_reg_write(unicam, UNICAM_CTRL, val);
+
+	unicam_reg_write(unicam, UNICAM_IHWIN, 0);
+	unicam_reg_write(unicam, UNICAM_IVWIN, 0);
+
+	/* AXI bus access QoS setup */
+	val = unicam_reg_read(unicam, UNICAM_PRI);
+	unicam_set_field(&val, 0, UNICAM_BL_MASK);
+	unicam_set_field(&val, 0, UNICAM_BS_MASK);
+	unicam_set_field(&val, 0xe, UNICAM_PP_MASK);
+	unicam_set_field(&val, 8, UNICAM_NP_MASK);
+	unicam_set_field(&val, 2, UNICAM_PT_MASK);
+	unicam_set_field(&val, 1, UNICAM_PE);
+	unicam_reg_write(unicam, UNICAM_PRI, val);
+
+	unicam_reg_write_field(unicam, UNICAM_ANA, 0, UNICAM_DDL);
+
+	/* Always start in trigger frame capture mode (UNICAM_FCM set) */
+	val = UNICAM_FSIE | UNICAM_FEIE | UNICAM_FCM | UNICAM_IBOB;
+	unicam_set_field(&val, line_int_freq, UNICAM_LCIE_MASK);
+	unicam_reg_write(unicam, UNICAM_ICTL, val);
+	unicam_reg_write(unicam, UNICAM_STA, UNICAM_STA_MASK_ALL);
+	unicam_reg_write(unicam, UNICAM_ISTA, UNICAM_ISTA_MASK_ALL);
+
+	/* tclk_term_en */
+	unicam_reg_write_field(unicam, UNICAM_CLT, 2, UNICAM_CLT1_MASK);
+	/* tclk_settle */
+	unicam_reg_write_field(unicam, UNICAM_CLT, 6, UNICAM_CLT2_MASK);
+	/* td_term_en */
+	unicam_reg_write_field(unicam, UNICAM_DLT, 2, UNICAM_DLT1_MASK);
+	/* ths_settle */
+	unicam_reg_write_field(unicam, UNICAM_DLT, 6, UNICAM_DLT2_MASK);
+	/* trx_enable */
+	unicam_reg_write_field(unicam, UNICAM_DLT, 0, UNICAM_DLT3_MASK);
+
+	unicam_reg_write_field(unicam, UNICAM_CTRL, 0, UNICAM_SOE);
+
+	/* Packet compare setup - required to avoid missing frame ends */
+	val = 0;
+	unicam_set_field(&val, 1, UNICAM_PCE);
+	unicam_set_field(&val, 1, UNICAM_GI);
+	unicam_set_field(&val, 1, UNICAM_CPH);
+	unicam_set_field(&val, 0, UNICAM_PCVC_MASK);
+	unicam_set_field(&val, 1, UNICAM_PCDT_MASK);
+	unicam_reg_write(unicam, UNICAM_CMP0, val);
+
+	/* Enable clock lane and set up terminations */
+	val = 0;
+	if (unicam->bus_type == V4L2_MBUS_CSI2_DPHY) {
+		/* CSI2 */
+		unicam_set_field(&val, 1, UNICAM_CLE);
+		unicam_set_field(&val, 1, UNICAM_CLLPE);
+		if (!(unicam->bus_flags & V4L2_MBUS_CSI2_NONCONTINUOUS_CLOCK)) {
+			unicam_set_field(&val, 1, UNICAM_CLTRE);
+			unicam_set_field(&val, 1, UNICAM_CLHSE);
+		}
+	} else {
+		/* CCP2 */
+		unicam_set_field(&val, 1, UNICAM_CLE);
+		unicam_set_field(&val, 1, UNICAM_CLHSE);
+		unicam_set_field(&val, 1, UNICAM_CLTRE);
+	}
+	unicam_reg_write(unicam, UNICAM_CLK, val);
+
+	/*
+	 * Enable required data lanes with appropriate terminations.
+	 * The same value needs to be written to UNICAM_DATn registers for
+	 * the active lanes, and 0 for inactive ones.
+	 */
+	val = 0;
+	if (unicam->bus_type == V4L2_MBUS_CSI2_DPHY) {
+		/* CSI2 */
+		unicam_set_field(&val, 1, UNICAM_DLE);
+		unicam_set_field(&val, 1, UNICAM_DLLPE);
+		if (!(unicam->bus_flags & V4L2_MBUS_CSI2_NONCONTINUOUS_CLOCK)) {
+			unicam_set_field(&val, 1, UNICAM_DLTRE);
+			unicam_set_field(&val, 1, UNICAM_DLHSE);
+		}
+	} else {
+		/* CCP2 */
+		unicam_set_field(&val, 1, UNICAM_DLE);
+		unicam_set_field(&val, 1, UNICAM_DLHSE);
+		unicam_set_field(&val, 1, UNICAM_DLTRE);
+	}
+	unicam_reg_write(unicam, UNICAM_DAT0, val);
+
+	if (unicam->pipe.num_data_lanes == 1)
+		val = 0;
+	unicam_reg_write(unicam, UNICAM_DAT1, val);
+
+	if (unicam->max_data_lanes > 2) {
+		/*
+		 * Registers UNICAM_DAT2 and UNICAM_DAT3 only valid if the
+		 * instance supports more than 2 data lanes.
+		 */
+		if (unicam->pipe.num_data_lanes == 2)
+			val = 0;
+		unicam_reg_write(unicam, UNICAM_DAT2, val);
+
+		if (unicam->pipe.num_data_lanes == 3)
+			val = 0;
+		unicam_reg_write(unicam, UNICAM_DAT3, val);
+	}
+
+	unicam_reg_write(unicam, UNICAM_IBLS,
+			 node->fmt.fmt.pix.bytesperline);
+	unicam_wr_dma_addr(node, node->cur_frm);
+	unicam_set_packing_config(unicam);
+	unicam_cfg_image_id(unicam);
+
+	val = unicam_reg_read(unicam, UNICAM_MISC);
+	unicam_set_field(&val, 1, UNICAM_FL0);
+	unicam_set_field(&val, 1, UNICAM_FL1);
+	unicam_reg_write(unicam, UNICAM_MISC, val);
+
+	/* Enable peripheral */
+	unicam_reg_write_field(unicam, UNICAM_CTRL, 1, UNICAM_CPE);
+
+	/* Load image pointers */
+	unicam_reg_write_field(unicam, UNICAM_ICTL, 1, UNICAM_LIP_MASK);
+
+	/*
+	 * Enable trigger only for the first frame to
+	 * sync correctly to the FS from the source.
+	 */
+	unicam_reg_write_field(unicam, UNICAM_ICTL, 1, UNICAM_TFC);
+}
+
+static void unicam_start_metadata(struct unicam_device *unicam)
+{
+	struct unicam_node *node = &unicam->node[UNICAM_METADATA_NODE];
+
+	unicam_enable_ed(unicam);
+	unicam_wr_dma_addr(node, node->cur_frm);
+	unicam_reg_write_field(unicam, UNICAM_DCS, 1, UNICAM_LDP);
+}
+
+static void unicam_disable(struct unicam_device *unicam)
+{
+	/* Analogue lane control disable */
+	unicam_reg_write_field(unicam, UNICAM_ANA, 1, UNICAM_DDL);
+
+	/* Stop the output engine */
+	unicam_reg_write_field(unicam, UNICAM_CTRL, 1, UNICAM_SOE);
+
+	/* Disable the data lanes. */
+	unicam_reg_write(unicam, UNICAM_DAT0, 0);
+	unicam_reg_write(unicam, UNICAM_DAT1, 0);
+
+	if (unicam->max_data_lanes > 2) {
+		unicam_reg_write(unicam, UNICAM_DAT2, 0);
+		unicam_reg_write(unicam, UNICAM_DAT3, 0);
+	}
+
+	/* Peripheral reset */
+	unicam_reg_write_field(unicam, UNICAM_CTRL, 1, UNICAM_CPR);
+	usleep_range(50, 100);
+	unicam_reg_write_field(unicam, UNICAM_CTRL, 0, UNICAM_CPR);
+
+	/* Disable peripheral */
+	unicam_reg_write_field(unicam, UNICAM_CTRL, 0, UNICAM_CPE);
+
+	/* Clear ED setup */
+	unicam_reg_write(unicam, UNICAM_DCS, 0);
+
+	/* Disable all lane clocks */
+	unicam_clk_write(unicam, 0);
+}
+
+/* -----------------------------------------------------------------------------
+ * V4L2 subdev operations
+ */
+
+static int __unicam_subdev_set_routing(struct v4l2_subdev *sd,
+				       struct v4l2_subdev_state *state,
+				       struct v4l2_subdev_krouting *routing)
+{
+	struct v4l2_subdev_route *route;
+	int ret;
+
+	ret = v4l2_subdev_routing_validate(sd, routing,
+					   V4L2_SUBDEV_ROUTING_ONLY_1_TO_1);
+	if (ret)
+		return ret;
+
+	ret = v4l2_subdev_set_routing(sd, state, routing);
+	if (ret)
+		return ret;
+
+	for_each_active_route(&state->routing, route) {
+		const struct v4l2_mbus_framefmt *def_fmt;
+		struct v4l2_mbus_framefmt *fmt;
+
+		if (route->source_pad == UNICAM_SD_PAD_SOURCE_IMAGE)
+			def_fmt = &unicam_default_image_format;
+		else
+			def_fmt = &unicam_default_meta_format;
+
+		fmt = v4l2_subdev_state_get_format(state, route->sink_pad,
+						   route->sink_stream);
+		*fmt = *def_fmt;
+		fmt = v4l2_subdev_state_get_format(state, route->source_pad,
+						   route->source_stream);
+		*fmt = *def_fmt;
+	}
+
+	return 0;
+}
+
+static int unicam_subdev_init_state(struct v4l2_subdev *sd,
+				    struct v4l2_subdev_state *state)
+{
+	struct v4l2_subdev_route routes[] = {
+		{
+			.sink_pad = UNICAM_SD_PAD_SINK,
+			.sink_stream = 0,
+			.source_pad = UNICAM_SD_PAD_SOURCE_IMAGE,
+			.source_stream = 0,
+			.flags = V4L2_SUBDEV_ROUTE_FL_ACTIVE,
+		},
+	};
+
+	struct v4l2_subdev_krouting routing = {
+		.len_routes = ARRAY_SIZE(routes),
+		.num_routes = ARRAY_SIZE(routes),
+		.routes = routes,
+	};
+
+	/* Initialize routing to single route to the fist source pad. */
+	return __unicam_subdev_set_routing(sd, state, &routing);
+}
+
+static int unicam_subdev_enum_mbus_code(struct v4l2_subdev *sd,
+					struct v4l2_subdev_state *state,
+					struct v4l2_subdev_mbus_code_enum *code)
+{
+	u32 pad, stream;
+	int ret;
+
+	ret = v4l2_subdev_routing_find_opposite_end(&state->routing,
+						    code->pad, code->stream,
+						    &pad, &stream);
+	if (ret)
+		return ret;
+
+	if (unicam_sd_pad_is_source(code->pad)) {
+		/* No transcoding, source and sink codes must match. */
+		const struct v4l2_mbus_framefmt *fmt;
+
+		fmt = v4l2_subdev_state_get_format(state, pad, stream);
+		if (!fmt)
+			return -EINVAL;
+
+		if (code->index > 0)
+			return -EINVAL;
+
+		code->code = fmt->code;
+	} else {
+		const struct unicam_format_info *formats;
+		unsigned int num_formats;
+
+		if (pad == UNICAM_SD_PAD_SOURCE_IMAGE) {
+			formats = unicam_image_formats;
+			num_formats = ARRAY_SIZE(unicam_image_formats);
+		} else {
+			formats = unicam_meta_formats;
+			num_formats = ARRAY_SIZE(unicam_meta_formats);
+		}
+
+		if (code->index >= num_formats)
+			return -EINVAL;
+
+		code->code = formats[code->index].code;
+	}
+
+	return 0;
+}
+
+static int unicam_subdev_enum_frame_size(struct v4l2_subdev *sd,
+					 struct v4l2_subdev_state *state,
+					 struct v4l2_subdev_frame_size_enum *fse)
+{
+	u32 pad, stream;
+	int ret;
+
+	if (fse->index > 0)
+		return -EINVAL;
+
+	ret = v4l2_subdev_routing_find_opposite_end(&state->routing, fse->pad,
+						    fse->stream, &pad,
+						    &stream);
+	if (ret)
+		return ret;
+
+	if (unicam_sd_pad_is_source(fse->pad)) {
+		/* No transcoding, source and sink formats must match. */
+		const struct v4l2_mbus_framefmt *fmt;
+
+		fmt = v4l2_subdev_state_get_format(state, pad, stream);
+		if (!fmt)
+			return -EINVAL;
+
+		if (fse->code != fmt->code)
+			return -EINVAL;
+
+		fse->min_width = fmt->width;
+		fse->max_width = fmt->width;
+		fse->min_height = fmt->height;
+		fse->max_height = fmt->height;
+	} else {
+		const struct unicam_format_info *fmtinfo;
+
+		fmtinfo = unicam_find_format_by_code(fse->code, pad);
+		if (!fmtinfo)
+			return -EINVAL;
+
+		if (pad == UNICAM_SD_PAD_SOURCE_IMAGE) {
+			fse->min_width = UNICAM_IMAGE_MIN_WIDTH;
+			fse->max_width = UNICAM_IMAGE_MAX_WIDTH;
+			fse->min_height = UNICAM_IMAGE_MIN_HEIGHT;
+			fse->max_height = UNICAM_IMAGE_MAX_HEIGHT;
+		} else {
+			fse->min_width = UNICAM_META_MIN_WIDTH;
+			fse->max_width = UNICAM_META_MAX_WIDTH;
+			fse->min_height = UNICAM_META_MIN_HEIGHT;
+			fse->max_height = UNICAM_META_MAX_HEIGHT;
+		}
+	}
+
+	return 0;
+}
+
+static int unicam_subdev_set_format(struct v4l2_subdev *sd,
+				    struct v4l2_subdev_state *state,
+				    struct v4l2_subdev_format *format)
+{
+	struct unicam_device *unicam = sd_to_unicam_device(sd);
+	struct v4l2_mbus_framefmt *sink_format, *source_format;
+	const struct unicam_format_info *fmtinfo;
+	u32 source_pad, source_stream;
+	int ret;
+
+	if (format->which == V4L2_SUBDEV_FORMAT_ACTIVE &&
+	    unicam->subdev.enabled_streams)
+		return -EBUSY;
+
+	/* No transcoding, source and sink formats must match. */
+	if (unicam_sd_pad_is_source(format->pad))
+		return v4l2_subdev_get_fmt(sd, state, format);
+
+	/*
+	 * Allowed formats for the stream on the sink pad depend on what source
+	 * pad the stream is routed to. Find the corresponding source pad and
+	 * use it to validate the media bus code.
+	 */
+	ret = v4l2_subdev_routing_find_opposite_end(&state->routing,
+						    format->pad, format->stream,
+						    &source_pad, &source_stream);
+	if (ret)
+		return ret;
+
+	fmtinfo = unicam_find_format_by_code(format->format.code, source_pad);
+	if (!fmtinfo) {
+		fmtinfo = source_pad == UNICAM_SD_PAD_SOURCE_IMAGE
+			? &unicam_image_formats[0] : &unicam_meta_formats[0];
+		format->format.code = fmtinfo->code;
+	}
+
+	if (source_pad == UNICAM_SD_PAD_SOURCE_IMAGE) {
+		format->format.width = clamp_t(unsigned int,
+					       format->format.width,
+					       UNICAM_IMAGE_MIN_WIDTH,
+					       UNICAM_IMAGE_MAX_WIDTH);
+		format->format.height = clamp_t(unsigned int,
+						format->format.height,
+						UNICAM_IMAGE_MIN_HEIGHT,
+						UNICAM_IMAGE_MAX_HEIGHT);
+		format->format.field = V4L2_FIELD_NONE;
+	} else {
+		format->format.width = clamp_t(unsigned int,
+					       format->format.width,
+					       UNICAM_META_MIN_WIDTH,
+					       UNICAM_META_MAX_WIDTH);
+		format->format.height = clamp_t(unsigned int,
+						format->format.height,
+						UNICAM_META_MIN_HEIGHT,
+						UNICAM_META_MAX_HEIGHT);
+		format->format.field = V4L2_FIELD_NONE;
+
+		/* Colorspace don't apply to metadata. */
+		format->format.colorspace = 0;
+		format->format.ycbcr_enc = 0;
+		format->format.quantization = 0;
+		format->format.xfer_func = 0;
+	}
+
+	sink_format = v4l2_subdev_state_get_format(state, format->pad,
+						   format->stream);
+	source_format = v4l2_subdev_state_get_format(state, source_pad,
+						     source_stream);
+	*sink_format = format->format;
+	*source_format = format->format;
+
+	return 0;
+}
+
+static int unicam_subdev_set_routing(struct v4l2_subdev *sd,
+				     struct v4l2_subdev_state *state,
+				     enum v4l2_subdev_format_whence which,
+				     struct v4l2_subdev_krouting *routing)
+{
+	struct unicam_device *unicam = sd_to_unicam_device(sd);
+
+	if (which == V4L2_SUBDEV_FORMAT_ACTIVE && unicam->subdev.enabled_streams)
+		return -EBUSY;
+
+	return __unicam_subdev_set_routing(sd, state, routing);
+}
+
+static int unicam_sd_enable_streams(struct v4l2_subdev *sd,
+				    struct v4l2_subdev_state *state, u32 pad,
+				    u64 streams_mask)
+{
+	struct unicam_device *unicam = sd_to_unicam_device(sd);
+	u32 other_pad, other_stream;
+	int ret;
+
+	ret = v4l2_subdev_routing_find_opposite_end(&state->routing, pad, 0,
+						    &other_pad, &other_stream);
+	if (ret)
+		return ret;
+
+	ret = v4l2_subdev_enable_streams(unicam->sensor.subdev,
+					 unicam->sensor.pad->index,
+					 BIT(other_stream));
+	if (ret) {
+		dev_err(unicam->dev, "stream on failed in subdev\n");
+		return ret;
+	}
+
+	unicam->subdev.enabled_streams |= BIT(other_stream);
+
+	return 0;
+}
+
+static int unicam_sd_disable_streams(struct v4l2_subdev *sd,
+				     struct v4l2_subdev_state *state, u32 pad,
+				     u64 streams_mask)
+{
+	struct unicam_device *unicam = sd_to_unicam_device(sd);
+	u32 other_pad, other_stream;
+	int ret;
+
+	ret = v4l2_subdev_routing_find_opposite_end(&state->routing, pad, 0,
+						    &other_pad, &other_stream);
+	if (ret)
+		return ret;
+
+	v4l2_subdev_disable_streams(unicam->sensor.subdev,
+				    unicam->sensor.pad->index,
+				    BIT(other_stream));
+
+	unicam->subdev.enabled_streams &= ~BIT(other_stream);
+
+	return 0;
+}
+
+static const struct v4l2_subdev_pad_ops unicam_subdev_pad_ops = {
+	.enum_mbus_code		= unicam_subdev_enum_mbus_code,
+	.enum_frame_size	= unicam_subdev_enum_frame_size,
+	.get_fmt		= v4l2_subdev_get_fmt,
+	.set_fmt		= unicam_subdev_set_format,
+	.set_routing		= unicam_subdev_set_routing,
+	.enable_streams		= unicam_sd_enable_streams,
+	.disable_streams	= unicam_sd_disable_streams,
+};
+
+static const struct v4l2_subdev_ops unicam_subdev_ops = {
+	.pad			= &unicam_subdev_pad_ops,
+};
+
+static const struct v4l2_subdev_internal_ops unicam_subdev_internal_ops = {
+	.init_state		= unicam_subdev_init_state,
+};
+
+static const struct media_entity_operations unicam_subdev_media_ops = {
+	.link_validate		= v4l2_subdev_link_validate,
+	.has_pad_interdep	= v4l2_subdev_has_pad_interdep,
+};
+
+static int unicam_subdev_init(struct unicam_device *unicam)
+{
+	struct v4l2_subdev *sd = &unicam->subdev.sd;
+	int ret;
+
+	v4l2_subdev_init(sd, &unicam_subdev_ops);
+	sd->internal_ops = &unicam_subdev_internal_ops;
+	v4l2_set_subdevdata(sd, unicam);
+
+	sd->entity.function = MEDIA_ENT_F_VID_IF_BRIDGE;
+	sd->entity.ops = &unicam_subdev_media_ops;
+	sd->dev = unicam->dev;
+	sd->owner = THIS_MODULE;
+	sd->flags = V4L2_SUBDEV_FL_HAS_DEVNODE | V4L2_SUBDEV_FL_STREAMS;
+
+	strscpy(sd->name, "unicam", sizeof(sd->name));
+
+	unicam->subdev.pads[UNICAM_SD_PAD_SINK].flags = MEDIA_PAD_FL_SINK;
+	unicam->subdev.pads[UNICAM_SD_PAD_SOURCE_IMAGE].flags = MEDIA_PAD_FL_SOURCE;
+	unicam->subdev.pads[UNICAM_SD_PAD_SOURCE_METADATA].flags = MEDIA_PAD_FL_SOURCE;
+
+	ret = media_entity_pads_init(&sd->entity, ARRAY_SIZE(unicam->subdev.pads),
+				     unicam->subdev.pads);
+	if (ret) {
+		dev_err(unicam->dev, "Failed to initialize media entity: %d\n",
+			ret);
+		return ret;
+	}
+
+	ret = v4l2_subdev_init_finalize(sd);
+	if (ret) {
+		dev_err(unicam->dev, "Failed to initialize subdev: %d\n", ret);
+		goto err_entity;
+	}
+
+	ret = v4l2_device_register_subdev(&unicam->v4l2_dev, sd);
+	if (ret) {
+		dev_err(unicam->dev, "Failed to register subdev: %d\n", ret);
+		goto err_subdev;
+	}
+
+	return 0;
+
+err_subdev:
+	v4l2_subdev_cleanup(sd);
+err_entity:
+	media_entity_cleanup(&sd->entity);
+	return ret;
+}
+
+static void unicam_subdev_cleanup(struct unicam_device *unicam)
+{
+	v4l2_subdev_cleanup(&unicam->subdev.sd);
+	media_entity_cleanup(&unicam->subdev.sd.entity);
+}
+
+/* -----------------------------------------------------------------------------
+ * Videobuf2 queue operations
+ */
+
+static int unicam_queue_setup(struct vb2_queue *vq, unsigned int *nbuffers,
+			      unsigned int *nplanes, unsigned int sizes[],
+			      struct device *alloc_devs[])
+{
+	struct unicam_node *node = vb2_get_drv_priv(vq);
+	u32 size = is_image_node(node) ? node->fmt.fmt.pix.sizeimage
+		 : node->fmt.fmt.meta.buffersize;
+
+	if (*nplanes) {
+		if (sizes[0] < size) {
+			dev_dbg(node->dev->dev, "sizes[0] %i < size %u\n",
+				sizes[0], size);
+			return -EINVAL;
+		}
+		size = sizes[0];
+	}
+
+	*nplanes = 1;
+	sizes[0] = size;
+
+	return 0;
+}
+
+static int unicam_buffer_prepare(struct vb2_buffer *vb)
+{
+	struct unicam_node *node = vb2_get_drv_priv(vb->vb2_queue);
+	struct unicam_buffer *buf = to_unicam_buffer(vb);
+	u32 size = is_image_node(node) ? node->fmt.fmt.pix.sizeimage
+		 : node->fmt.fmt.meta.buffersize;
+
+	if (vb2_plane_size(vb, 0) < size) {
+		dev_dbg(node->dev->dev,
+			"data will not fit into plane (%lu < %u)\n",
+			vb2_plane_size(vb, 0), size);
+		return -EINVAL;
+	}
+
+	buf->dma_addr = vb2_dma_contig_plane_dma_addr(&buf->vb.vb2_buf, 0);
+	buf->size = size;
+
+	vb2_set_plane_payload(&buf->vb.vb2_buf, 0, size);
+
+	return 0;
+}
+
+static void unicam_return_buffers(struct unicam_node *node,
+				  enum vb2_buffer_state state)
+{
+	struct unicam_buffer *buf, *tmp;
+
+	list_for_each_entry_safe(buf, tmp, &node->dma_queue, list) {
+		list_del(&buf->list);
+		vb2_buffer_done(&buf->vb.vb2_buf, state);
+	}
+
+	if (node->cur_frm)
+		vb2_buffer_done(&node->cur_frm->vb.vb2_buf,
+				state);
+	if (node->next_frm && node->cur_frm != node->next_frm)
+		vb2_buffer_done(&node->next_frm->vb.vb2_buf,
+				state);
+
+	node->cur_frm = NULL;
+	node->next_frm = NULL;
+}
+
+static int unicam_num_data_lanes(struct unicam_device *unicam)
+{
+	struct v4l2_mbus_config mbus_config = { 0 };
+	unsigned int num_data_lanes;
+	int ret;
+
+	if (unicam->bus_type != V4L2_MBUS_CSI2_DPHY)
+		return unicam->max_data_lanes;
+
+	ret = v4l2_subdev_call(unicam->sensor.subdev, pad, get_mbus_config,
+			       unicam->sensor.pad->index, &mbus_config);
+	if (ret == -ENOIOCTLCMD)
+		return unicam->max_data_lanes;
+
+	if (ret < 0) {
+		dev_err(unicam->dev, "Failed to get mbus config: %d\n", ret);
+		return ret;
+	}
+
+	num_data_lanes = mbus_config.bus.mipi_csi2.num_data_lanes;
+
+	if (num_data_lanes != 1 && num_data_lanes != 2 && num_data_lanes != 4) {
+		dev_err(unicam->dev,
+			"Device %s has requested %u data lanes, invalid\n",
+			unicam->sensor.subdev->name, num_data_lanes);
+		return -EINVAL;
+	}
+
+	if (num_data_lanes > unicam->max_data_lanes) {
+		dev_err(unicam->dev,
+			"Device %s has requested %u data lanes, >%u configured in DT\n",
+			unicam->sensor.subdev->name, num_data_lanes,
+			unicam->max_data_lanes);
+		return -EINVAL;
+	}
+
+	return num_data_lanes;
+}
+
+static int unicam_start_streaming(struct vb2_queue *vq, unsigned int count)
+{
+	struct unicam_node *node = vb2_get_drv_priv(vq);
+	struct unicam_device *unicam = node->dev;
+	struct unicam_buffer *buf;
+	struct media_pipeline_pad_iter iter;
+	struct media_pad *pad;
+	unsigned long flags;
+	int ret;
+
+	dev_dbg(unicam->dev, "Starting stream on %s device\n",
+		is_metadata_node(node) ? "metadata" : "image");
+
+	/*
+	 * Start the pipeline. This validates all links, and populates the
+	 * pipeline structure.
+	 */
+	ret = video_device_pipeline_start(&node->video_dev, &unicam->pipe.pipe);
+	if (ret < 0) {
+		dev_dbg(unicam->dev, "Failed to start media pipeline: %d\n", ret);
+		goto err_buffers;
+	}
+
+	/*
+	 * Determine which video nodes are included in the pipeline, and get the
+	 * number of data lanes.
+	 */
+	if (unicam->pipe.pipe.start_count == 1) {
+		unicam->pipe.nodes = 0;
+
+		media_pipeline_for_each_pad(&unicam->pipe.pipe, &iter, pad) {
+			if (pad->entity != &unicam->subdev.sd.entity)
+				continue;
+
+			if (pad->index == UNICAM_SD_PAD_SOURCE_IMAGE)
+				unicam->pipe.nodes |= BIT(UNICAM_IMAGE_NODE);
+			else if (pad->index == UNICAM_SD_PAD_SOURCE_METADATA)
+				unicam->pipe.nodes |= BIT(UNICAM_METADATA_NODE);
+		}
+
+		if (!(unicam->pipe.nodes & BIT(UNICAM_IMAGE_NODE))) {
+			dev_dbg(unicam->dev,
+				"Pipeline does not include image node\n");
+			ret = -EPIPE;
+			goto err_pipeline;
+		}
+
+		ret = unicam_num_data_lanes(unicam);
+		if (ret < 0)
+			goto err_pipeline;
+
+		unicam->pipe.num_data_lanes = ret;
+
+		dev_dbg(unicam->dev, "Running with %u data lanes, nodes %u\n",
+			unicam->pipe.num_data_lanes, unicam->pipe.nodes);
+	}
+
+	node->streaming = true;
+
+	/* Arm the node with the first buffer from the DMA queue. */
+	spin_lock_irqsave(&node->dma_queue_lock, flags);
+	buf = list_first_entry(&node->dma_queue, struct unicam_buffer, list);
+	node->cur_frm = buf;
+	node->next_frm = buf;
+	list_del(&buf->list);
+	spin_unlock_irqrestore(&node->dma_queue_lock, flags);
+
+	/*
+	 * Wait for all the video devices in the pipeline to have been started
+	 * before starting the hardware. In the general case, this would
+	 * prevent capturing multiple streams independently. However, the
+	 * Unicam DMA engines are not generic, they have been designed to
+	 * capture image data and embedded data from the same camera sensor.
+	 * Not only does the main use case not benefit from independent
+	 * capture, it requires proper synchronization of the streams at start
+	 * time.
+	 */
+	if (unicam->pipe.pipe.start_count < hweight32(unicam->pipe.nodes))
+		return 0;
+
+	/* Configure and start Unicam. */
+	ret = pm_runtime_resume_and_get(unicam->dev);
+	if (ret < 0) {
+		dev_err(unicam->dev, "PM runtime resume failed: %d\n", ret);
+		goto err_pipeline;
+	}
+
+	unicam->sequence = 0;
+
+	if (unicam->pipe.nodes & BIT(UNICAM_METADATA_NODE))
+		unicam_start_metadata(unicam);
+
+	unicam_start_rx(unicam);
+
+	/* Enable the streams on the source. */
+	ret = v4l2_subdev_enable_streams(&unicam->subdev.sd,
+					 UNICAM_SD_PAD_SOURCE_IMAGE,
+					 BIT(0));
+	if (ret < 0) {
+		dev_err(unicam->dev, "stream on failed in subdev\n");
+		goto err_pm_put;
+	}
+
+	if (unicam->pipe.nodes & BIT(UNICAM_METADATA_NODE)) {
+		ret = v4l2_subdev_enable_streams(&unicam->subdev.sd,
+						 UNICAM_SD_PAD_SOURCE_METADATA,
+						 BIT(0));
+		if (ret < 0) {
+			dev_err(unicam->dev, "stream on failed in subdev\n");
+			goto err_pm_put;
+		}
+	}
+
+	return 0;
+
+err_pm_put:
+	pm_runtime_put_sync(unicam->dev);
+err_pipeline:
+	video_device_pipeline_stop(&node->video_dev);
+err_buffers:
+	unicam_return_buffers(node, VB2_BUF_STATE_QUEUED);
+	node->streaming = false;
+	return ret;
+}
+
+static void unicam_stop_streaming(struct vb2_queue *vq)
+{
+	struct unicam_node *node = vb2_get_drv_priv(vq);
+	struct unicam_device *unicam = node->dev;
+
+	/* Stop the hardware when the first video device gets stopped. */
+	if (unicam->pipe.pipe.start_count == hweight32(unicam->pipe.nodes)) {
+		if (unicam->pipe.nodes & BIT(UNICAM_METADATA_NODE))
+			v4l2_subdev_disable_streams(&unicam->subdev.sd,
+						    UNICAM_SD_PAD_SOURCE_METADATA,
+						    BIT(0));
+
+		v4l2_subdev_disable_streams(&unicam->subdev.sd,
+					    UNICAM_SD_PAD_SOURCE_IMAGE,
+					    BIT(0));
+
+		unicam_disable(unicam);
+
+		pm_runtime_put(unicam->dev);
+	}
+
+	node->streaming = false;
+
+	video_device_pipeline_stop(&node->video_dev);
+
+	/* Clear all queued buffers for the node */
+	unicam_return_buffers(node, VB2_BUF_STATE_ERROR);
+}
+
+static void unicam_buffer_queue(struct vb2_buffer *vb)
+{
+	struct unicam_node *node = vb2_get_drv_priv(vb->vb2_queue);
+	struct unicam_buffer *buf = to_unicam_buffer(vb);
+
+	spin_lock_irq(&node->dma_queue_lock);
+	list_add_tail(&buf->list, &node->dma_queue);
+	spin_unlock_irq(&node->dma_queue_lock);
+}
+
+static const struct vb2_ops unicam_video_qops = {
+	.queue_setup		= unicam_queue_setup,
+	.wait_prepare		= vb2_ops_wait_prepare,
+	.wait_finish		= vb2_ops_wait_finish,
+	.buf_prepare		= unicam_buffer_prepare,
+	.start_streaming	= unicam_start_streaming,
+	.stop_streaming		= unicam_stop_streaming,
+	.buf_queue		= unicam_buffer_queue,
+};
+
+/* -----------------------------------------------------------------------------
+ *  V4L2 video device operations
+ */
+
+static int unicam_querycap(struct file *file, void *priv,
+			   struct v4l2_capability *cap)
+{
+	strscpy(cap->driver, UNICAM_MODULE_NAME, sizeof(cap->driver));
+	strscpy(cap->card, UNICAM_MODULE_NAME, sizeof(cap->card));
+
+	cap->capabilities |= V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_META_CAPTURE;
+
+	return 0;
+}
+
+static int unicam_enum_fmt_vid(struct file *file, void  *priv,
+			       struct v4l2_fmtdesc *f)
+{
+	unsigned int index;
+	unsigned int i;
+
+	for (i = 0, index = 0; i < ARRAY_SIZE(unicam_image_formats); i++) {
+		if (f->mbus_code && unicam_image_formats[i].code != f->mbus_code)
+			continue;
+
+		if (index == f->index) {
+			f->pixelformat = unicam_image_formats[i].fourcc;
+			return 0;
+		}
+
+		index++;
+
+		if (!unicam_image_formats[i].unpacked_fourcc)
+			continue;
+
+		if (index == f->index) {
+			f->pixelformat = unicam_image_formats[i].unpacked_fourcc;
+			return 0;
+		}
+
+		index++;
+	}
+
+	return -EINVAL;
+}
+
+static int unicam_g_fmt_vid(struct file *file, void *priv,
+			    struct v4l2_format *f)
+{
+	struct unicam_node *node = video_drvdata(file);
+
+	*f = node->fmt;
+
+	return 0;
+}
+
+static const struct unicam_format_info *
+__unicam_try_fmt_vid(struct unicam_node *node, struct v4l2_pix_format *pix)
+{
+	const struct unicam_format_info *fmtinfo;
+
+	/*
+	 * Default to the first format if the requested pixel format code isn't
+	 * supported.
+	 */
+	fmtinfo = unicam_find_format_by_fourcc(pix->pixelformat,
+					       UNICAM_SD_PAD_SOURCE_IMAGE);
+	if (!fmtinfo) {
+		fmtinfo = &unicam_image_formats[0];
+		pix->pixelformat = fmtinfo->fourcc;
+	}
+
+	unicam_calc_image_size_bpl(node->dev, fmtinfo, pix);
+
+	if (pix->field == V4L2_FIELD_ANY)
+		pix->field = V4L2_FIELD_NONE;
+
+	return fmtinfo;
+}
+
+static int unicam_try_fmt_vid(struct file *file, void *priv,
+			      struct v4l2_format *f)
+{
+	struct unicam_node *node = video_drvdata(file);
+
+	__unicam_try_fmt_vid(node, &f->fmt.pix);
+	return 0;
+}
+
+static int unicam_s_fmt_vid(struct file *file, void *priv,
+			    struct v4l2_format *f)
+{
+	struct unicam_node *node = video_drvdata(file);
+
+	if (vb2_is_busy(&node->buffer_queue))
+		return -EBUSY;
+
+	node->fmtinfo = __unicam_try_fmt_vid(node, &f->fmt.pix);
+	node->fmt = *f;
+
+	return 0;
+}
+
+static int unicam_enum_fmt_meta(struct file *file, void *priv,
+				struct v4l2_fmtdesc *f)
+{
+	unsigned int i, index;
+
+	for (i = 0, index = 0; i < ARRAY_SIZE(unicam_meta_formats); i++) {
+		if (f->mbus_code && unicam_meta_formats[i].code != f->mbus_code)
+			continue;
+
+		if (index == f->index) {
+			f->pixelformat = unicam_meta_formats[i].fourcc;
+			f->type = V4L2_BUF_TYPE_META_CAPTURE;
+			f->flags = V4L2_FMT_FLAG_META_LINE_BASED;
+			return 0;
+		}
+
+		index++;
+	}
+
+	return -EINVAL;
+}
+
+static int unicam_g_fmt_meta(struct file *file, void *priv,
+			     struct v4l2_format *f)
+{
+	struct unicam_node *node = video_drvdata(file);
+
+	f->fmt.meta = node->fmt.fmt.meta;
+
+	return 0;
+}
+
+static const struct unicam_format_info *
+__unicam_try_fmt_meta(struct unicam_node *node, struct v4l2_meta_format *meta)
+{
+	const struct unicam_format_info *fmtinfo;
+
+	/*
+	 * Default to the first format if the requested pixel format code isn't
+	 * supported.
+	 */
+	fmtinfo = unicam_find_format_by_fourcc(meta->dataformat,
+					       UNICAM_SD_PAD_SOURCE_METADATA);
+	if (!fmtinfo) {
+		fmtinfo = &unicam_meta_formats[0];
+		meta->dataformat = fmtinfo->fourcc;
+	}
+
+	unicam_calc_meta_size_bpl(node->dev, fmtinfo, meta);
+
+	return fmtinfo;
+}
+
+static int unicam_try_fmt_meta(struct file *file, void *priv,
+			       struct v4l2_format *f)
+{
+	struct unicam_node *node = video_drvdata(file);
+
+	__unicam_try_fmt_vid(node, &f->fmt.pix);
+	return 0;
+}
+
+static int unicam_s_fmt_meta(struct file *file, void *priv,
+			     struct v4l2_format *f)
+{
+	struct unicam_node *node = video_drvdata(file);
+
+	if (vb2_is_busy(&node->buffer_queue))
+		return -EBUSY;
+
+	node->fmtinfo = __unicam_try_fmt_meta(node, &f->fmt.meta);
+	node->fmt = *f;
+
+	return 0;
+}
+
+static int unicam_enum_framesizes(struct file *file, void *fh,
+				  struct v4l2_frmsizeenum *fsize)
+{
+	struct unicam_node *node = video_drvdata(file);
+	int ret = -EINVAL;
+
+	if (fsize->index > 0)
+		return ret;
+
+	if (is_image_node(node)) {
+		if (!unicam_find_format_by_fourcc(fsize->pixel_format,
+						  UNICAM_SD_PAD_SOURCE_IMAGE))
+			return ret;
+
+		fsize->type = V4L2_FRMSIZE_TYPE_STEPWISE;
+		fsize->stepwise.min_width = UNICAM_IMAGE_MIN_WIDTH;
+		fsize->stepwise.max_width = UNICAM_IMAGE_MAX_WIDTH;
+		fsize->stepwise.step_width = 1;
+		fsize->stepwise.min_height = UNICAM_IMAGE_MIN_HEIGHT;
+		fsize->stepwise.max_height = UNICAM_IMAGE_MAX_HEIGHT;
+		fsize->stepwise.step_height = 1;
+	} else {
+		if (!unicam_find_format_by_fourcc(fsize->pixel_format,
+						  UNICAM_SD_PAD_SOURCE_METADATA))
+			return ret;
+
+		fsize->type = V4L2_FRMSIZE_TYPE_STEPWISE;
+		fsize->stepwise.min_width = UNICAM_META_MIN_WIDTH;
+		fsize->stepwise.max_width = UNICAM_META_MAX_WIDTH;
+		fsize->stepwise.step_width = 1;
+		fsize->stepwise.min_height = UNICAM_META_MIN_HEIGHT;
+		fsize->stepwise.max_height = UNICAM_META_MAX_HEIGHT;
+		fsize->stepwise.step_height = 1;
+	}
+
+	return 0;
+}
+
+static int unicam_log_status(struct file *file, void *fh)
+{
+	struct unicam_node *node = video_drvdata(file);
+	struct unicam_device *unicam = node->dev;
+	u32 reg;
+
+	/* status for sub devices */
+	v4l2_device_call_all(&unicam->v4l2_dev, 0, core, log_status);
+
+	dev_info(unicam->dev, "-----Receiver status-----\n");
+	dev_info(unicam->dev, "V4L2 width/height:   %ux%u\n",
+		 node->fmt.fmt.pix.width, node->fmt.fmt.pix.height);
+	dev_info(unicam->dev, "Mediabus format:     %08x\n",
+		 node->fmtinfo->code);
+	dev_info(unicam->dev, "V4L2 format:         %08x\n",
+		 node->fmt.fmt.pix.pixelformat);
+	reg = unicam_reg_read(unicam, UNICAM_IPIPE);
+	dev_info(unicam->dev, "Unpacking/packing:   %u / %u\n",
+		 unicam_get_field(reg, UNICAM_PUM_MASK),
+		 unicam_get_field(reg, UNICAM_PPM_MASK));
+	dev_info(unicam->dev, "----Live data----\n");
+	dev_info(unicam->dev, "Programmed stride:   %4u\n",
+		 unicam_reg_read(unicam, UNICAM_IBLS));
+	dev_info(unicam->dev, "Detected resolution: %ux%u\n",
+		 unicam_reg_read(unicam, UNICAM_IHSTA),
+		 unicam_reg_read(unicam, UNICAM_IVSTA));
+	dev_info(unicam->dev, "Write pointer:       %08x\n",
+		 unicam_reg_read(unicam, UNICAM_IBWP));
+
+	return 0;
+}
+
+static int unicam_subscribe_event(struct v4l2_fh *fh,
+				  const struct v4l2_event_subscription *sub)
+{
+	switch (sub->type) {
+	case V4L2_EVENT_FRAME_SYNC:
+		return v4l2_event_subscribe(fh, sub, 2, NULL);
+	default:
+		return -EINVAL;
+	}
+}
+
+static const struct v4l2_ioctl_ops unicam_ioctl_ops = {
+	.vidioc_querycap		= unicam_querycap,
+
+	.vidioc_enum_fmt_vid_cap	= unicam_enum_fmt_vid,
+	.vidioc_g_fmt_vid_cap		= unicam_g_fmt_vid,
+	.vidioc_try_fmt_vid_cap		= unicam_try_fmt_vid,
+	.vidioc_s_fmt_vid_cap		= unicam_s_fmt_vid,
+
+	.vidioc_enum_fmt_meta_cap	= unicam_enum_fmt_meta,
+	.vidioc_g_fmt_meta_cap		= unicam_g_fmt_meta,
+	.vidioc_try_fmt_meta_cap	= unicam_try_fmt_meta,
+	.vidioc_s_fmt_meta_cap		= unicam_s_fmt_meta,
+
+	.vidioc_enum_framesizes		= unicam_enum_framesizes,
+
+	.vidioc_reqbufs			= vb2_ioctl_reqbufs,
+	.vidioc_create_bufs		= vb2_ioctl_create_bufs,
+	.vidioc_prepare_buf		= vb2_ioctl_prepare_buf,
+	.vidioc_querybuf		= vb2_ioctl_querybuf,
+	.vidioc_qbuf			= vb2_ioctl_qbuf,
+	.vidioc_dqbuf			= vb2_ioctl_dqbuf,
+	.vidioc_expbuf			= vb2_ioctl_expbuf,
+	.vidioc_streamon		= vb2_ioctl_streamon,
+	.vidioc_streamoff		= vb2_ioctl_streamoff,
+
+	.vidioc_log_status		= unicam_log_status,
+	.vidioc_subscribe_event		= unicam_subscribe_event,
+	.vidioc_unsubscribe_event	= v4l2_event_unsubscribe,
+};
+
+/* unicam capture driver file operations */
+static const struct v4l2_file_operations unicam_fops = {
+	.owner		= THIS_MODULE,
+	.open           = v4l2_fh_open,
+	.release        = vb2_fop_release,
+	.poll		= vb2_fop_poll,
+	.unlocked_ioctl = video_ioctl2,
+	.mmap           = vb2_fop_mmap,
+};
+
+static int unicam_video_link_validate(struct media_link *link)
+{
+	struct video_device *vdev =
+		media_entity_to_video_device(link->sink->entity);
+	struct v4l2_subdev *sd =
+		media_entity_to_v4l2_subdev(link->source->entity);
+	struct unicam_node *node = video_get_drvdata(vdev);
+	const u32 pad = is_image_node(node) ? UNICAM_SD_PAD_SOURCE_IMAGE
+		      : UNICAM_SD_PAD_SOURCE_METADATA;
+	const struct v4l2_mbus_framefmt *format;
+	struct v4l2_subdev_state *state;
+	int ret = 0;
+
+	state = v4l2_subdev_lock_and_get_active_state(sd);
+
+	format = v4l2_subdev_state_get_format(state, pad, 0);
+	if (!format) {
+		ret = -EINVAL;
+		goto out;
+	}
+
+	if (is_image_node(node)) {
+		const struct v4l2_pix_format *fmt = &node->fmt.fmt.pix;
+
+		if (node->fmtinfo->code != format->code ||
+		    fmt->height != format->height ||
+		    fmt->width != format->width ||
+		    fmt->field != format->field) {
+			dev_dbg(node->dev->dev,
+				"image: (%u x %u) 0x%08x %s != (%u x %u) 0x%08x %s\n",
+				fmt->width, fmt->height, node->fmtinfo->code,
+				v4l2_field_names[fmt->field],
+				format->width, format->height, format->code,
+				v4l2_field_names[format->field]);
+			ret = -EPIPE;
+		}
+	} else {
+		const struct v4l2_meta_format *fmt = &node->fmt.fmt.meta;
+
+		if (node->fmtinfo->code != format->code ||
+		    fmt->height != format->height ||
+		    fmt->width != format->width) {
+			dev_dbg(node->dev->dev,
+				"meta: (%u x %u) 0x%04x != (%u x %u) 0x%04x\n",
+				fmt->width, fmt->height, node->fmtinfo->code,
+				format->width, format->height, format->code);
+			ret = -EPIPE;
+		}
+	}
+
+out:
+	v4l2_subdev_unlock_state(state);
+	return ret;
+}
+
+static const struct media_entity_operations unicam_video_media_ops = {
+	.link_validate = unicam_video_link_validate,
+};
+
+static void unicam_node_release(struct video_device *vdev)
+{
+	struct unicam_node *node = video_get_drvdata(vdev);
+
+	unicam_put(node->dev);
+}
+
+static void unicam_set_default_format(struct unicam_node *node)
+{
+	if (is_image_node(node)) {
+		struct v4l2_pix_format *fmt = &node->fmt.fmt.pix;
+
+		node->fmtinfo = &unicam_image_formats[0];
+		node->fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+
+		v4l2_fill_pix_format(fmt, &unicam_default_image_format);
+		fmt->pixelformat = node->fmtinfo->fourcc;
+		unicam_calc_image_size_bpl(node->dev, node->fmtinfo, fmt);
+	} else {
+		struct v4l2_meta_format *fmt = &node->fmt.fmt.meta;
+
+		node->fmtinfo = &unicam_meta_formats[0];
+		node->fmt.type = V4L2_BUF_TYPE_META_CAPTURE;
+
+		fmt->dataformat = node->fmtinfo->fourcc;
+		fmt->width = unicam_default_meta_format.width;
+		fmt->height = unicam_default_meta_format.height;
+		unicam_calc_meta_size_bpl(node->dev, node->fmtinfo, fmt);
+	}
+}
+
+static int unicam_register_node(struct unicam_device *unicam,
+				enum unicam_node_type type)
+{
+	const u32 pad_index = type == UNICAM_IMAGE_NODE
+			    ? UNICAM_SD_PAD_SOURCE_IMAGE
+			    : UNICAM_SD_PAD_SOURCE_METADATA;
+	struct unicam_node *node = &unicam->node[type];
+	struct video_device *vdev = &node->video_dev;
+	struct vb2_queue *q = &node->buffer_queue;
+	int ret;
+
+	node->dev = unicam_get(unicam);
+	node->id = type;
+
+	spin_lock_init(&node->dma_queue_lock);
+
+	INIT_LIST_HEAD(&node->dma_queue);
+
+	/* Initialize the videobuf2 queue. */
+	q->type = type == UNICAM_IMAGE_NODE ? V4L2_BUF_TYPE_VIDEO_CAPTURE
+					    : V4L2_BUF_TYPE_META_CAPTURE;
+	q->io_modes = VB2_MMAP | VB2_DMABUF;
+	q->drv_priv = node;
+	q->ops = &unicam_video_qops;
+	q->mem_ops = &vb2_dma_contig_memops;
+	q->buf_struct_size = sizeof(struct unicam_buffer);
+	q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
+	q->lock = &unicam->lock;
+	q->min_queued_buffers = 1;
+	q->dev = unicam->dev;
+
+	ret = vb2_queue_init(q);
+	if (ret) {
+		dev_err(unicam->dev, "vb2_queue_init() failed\n");
+		goto err_unicam_put;
+	}
+
+	/* Initialize the video device. */
+	vdev->release = unicam_node_release;
+	vdev->fops = &unicam_fops;
+	vdev->ioctl_ops = &unicam_ioctl_ops;
+	vdev->v4l2_dev = &unicam->v4l2_dev;
+	vdev->vfl_dir = VFL_DIR_RX;
+	vdev->queue = q;
+	vdev->lock = &unicam->lock;
+	vdev->device_caps = type == UNICAM_IMAGE_NODE
+			  ? V4L2_CAP_VIDEO_CAPTURE : V4L2_CAP_META_CAPTURE;
+	vdev->device_caps |= V4L2_CAP_STREAMING | V4L2_CAP_IO_MC;
+	vdev->entity.ops = &unicam_video_media_ops;
+
+	snprintf(vdev->name, sizeof(vdev->name), "%s-%s", UNICAM_MODULE_NAME,
+		 type == UNICAM_IMAGE_NODE ? "image" : "embedded");
+
+	video_set_drvdata(vdev, node);
+
+	if (type == UNICAM_IMAGE_NODE)
+		vdev->entity.flags |= MEDIA_ENT_FL_DEFAULT;
+
+	node->pad.flags = MEDIA_PAD_FL_SINK;
+
+	ret = media_entity_pads_init(&vdev->entity, 1, &node->pad);
+	if (ret)
+		goto err_unicam_put;
+
+	node->dummy_buf.size = UNICAM_DUMMY_BUF_SIZE;
+	node->dummy_buf_cpu_addr = dma_alloc_coherent(unicam->dev,
+						      node->dummy_buf.size,
+						      &node->dummy_buf.dma_addr,
+						      GFP_KERNEL);
+	if (!node->dummy_buf_cpu_addr) {
+		dev_err(unicam->dev, "Unable to allocate dummy buffer.\n");
+		ret = -ENOMEM;
+		goto err_entity_cleanup;
+	}
+
+	unicam_set_default_format(node);
+
+	ret = video_register_device(vdev, VFL_TYPE_VIDEO, -1);
+	if (ret) {
+		dev_err(unicam->dev, "Unable to register video device %s\n",
+			vdev->name);
+		goto err_dma_free;
+	}
+
+	node->registered = true;
+
+	ret = media_create_pad_link(&unicam->subdev.sd.entity,
+				    pad_index,
+				    &node->video_dev.entity,
+				    0,
+				    MEDIA_LNK_FL_ENABLED |
+				    MEDIA_LNK_FL_IMMUTABLE);
+	if (ret) {
+		/*
+		 * No need for cleanup, the caller will unregister the
+		 * video device, which will drop the reference on the
+		 * device and trigger the cleanup.
+		 */
+		dev_err(unicam->dev, "Unable to create pad link for %s\n",
+			unicam->sensor.subdev->name);
+		return ret;
+	}
+
+	return 0;
+
+err_dma_free:
+	dma_free_coherent(unicam->dev, node->dummy_buf.size,
+			  node->dummy_buf_cpu_addr,
+			  node->dummy_buf.dma_addr);
+err_entity_cleanup:
+	media_entity_cleanup(&vdev->entity);
+err_unicam_put:
+	unicam_put(unicam);
+	return ret;
+}
+
+static void unicam_unregister_nodes(struct unicam_device *unicam)
+{
+	unsigned int i;
+
+	for (i = 0; i < ARRAY_SIZE(unicam->node); i++) {
+		struct unicam_node *node = &unicam->node[i];
+
+		if (node->dummy_buf_cpu_addr)
+			dma_free_coherent(unicam->dev, node->dummy_buf.size,
+					  node->dummy_buf_cpu_addr,
+					  node->dummy_buf.dma_addr);
+
+		if (node->registered) {
+			video_unregister_device(&node->video_dev);
+			node->registered = false;
+		}
+	}
+}
+
+/* -----------------------------------------------------------------------------
+ * Power management
+ */
+
+static int unicam_runtime_resume(struct device *dev)
+{
+	struct unicam_device *unicam = dev_get_drvdata(dev);
+	int ret;
+
+	ret = clk_set_min_rate(unicam->vpu_clock, UNICAM_MIN_VPU_CLOCK_RATE);
+	if (ret) {
+		dev_err(unicam->dev, "failed to set up VPU clock\n");
+		return ret;
+	}
+
+	ret = clk_prepare_enable(unicam->vpu_clock);
+	if (ret) {
+		dev_err(unicam->dev, "Failed to enable VPU clock: %d\n", ret);
+		goto err_vpu_clock;
+	}
+
+	ret = clk_set_rate(unicam->clock, 100 * 1000 * 1000);
+	if (ret) {
+		dev_err(unicam->dev, "failed to set up CSI clock\n");
+		goto err_vpu_prepare;
+	}
+
+	ret = clk_prepare_enable(unicam->clock);
+	if (ret) {
+		dev_err(unicam->dev, "Failed to enable CSI clock: %d\n", ret);
+		goto err_vpu_prepare;
+	}
+
+	return 0;
+
+err_vpu_prepare:
+	clk_disable_unprepare(unicam->vpu_clock);
+err_vpu_clock:
+	if (clk_set_min_rate(unicam->vpu_clock, 0))
+		dev_err(unicam->dev, "failed to reset the VPU clock\n");
+
+	return ret;
+}
+
+static int unicam_runtime_suspend(struct device *dev)
+{
+	struct unicam_device *unicam = dev_get_drvdata(dev);
+
+	clk_disable_unprepare(unicam->clock);
+
+	if (clk_set_min_rate(unicam->vpu_clock, 0))
+		dev_err(unicam->dev, "failed to reset the VPU clock\n");
+
+	clk_disable_unprepare(unicam->vpu_clock);
+
+	return 0;
+}
+
+static const struct dev_pm_ops unicam_pm_ops = {
+	RUNTIME_PM_OPS(unicam_runtime_suspend, unicam_runtime_resume, NULL)
+};
+
+/* -----------------------------------------------------------------------------
+ * V4L2 async notifier
+ */
+
+static int unicam_async_bound(struct v4l2_async_notifier *notifier,
+			      struct v4l2_subdev *subdev,
+			      struct v4l2_async_connection *asc)
+{
+	struct unicam_device *unicam = notifier_to_unicam_device(notifier);
+	struct media_pad *sink = &unicam->subdev.pads[UNICAM_SD_PAD_SINK];
+	struct media_pad *source;
+	int ret;
+
+	dev_dbg(unicam->dev, "Using sensor %s for capture\n",
+		subdev->name);
+
+	ret = v4l2_create_fwnode_links_to_pad(subdev, sink, MEDIA_LNK_FL_ENABLED |
+					      MEDIA_LNK_FL_IMMUTABLE);
+	if (ret)
+		return ret;
+
+	source = media_pad_remote_pad_unique(sink);
+	if (!source) {
+		dev_err(unicam->dev, "No connected sensor pad\n");
+		return -ENOTCONN;
+	}
+
+	unicam->sensor.subdev = subdev;
+	unicam->sensor.pad = source;
+
+	return 0;
+}
+
+static int unicam_async_complete(struct v4l2_async_notifier *notifier)
+{
+	struct unicam_device *unicam = notifier_to_unicam_device(notifier);
+	int ret;
+
+	ret = unicam_register_node(unicam, UNICAM_IMAGE_NODE);
+	if (ret) {
+		dev_err(unicam->dev, "Unable to register image video device.\n");
+		goto unregister;
+	}
+
+	ret = unicam_register_node(unicam, UNICAM_METADATA_NODE);
+	if (ret) {
+		dev_err(unicam->dev, "Unable to register metadata video device.\n");
+		goto unregister;
+	}
+
+	ret = v4l2_device_register_subdev_nodes(&unicam->v4l2_dev);
+	if (ret) {
+		dev_err(unicam->dev, "Unable to register subdev nodes.\n");
+		goto unregister;
+	}
+
+	return 0;
+
+unregister:
+	unicam_unregister_nodes(unicam);
+	unicam_put(unicam);
+
+	return ret;
+}
+
+static const struct v4l2_async_notifier_operations unicam_async_ops = {
+	.bound = unicam_async_bound,
+	.complete = unicam_async_complete,
+};
+
+static int unicam_async_nf_init(struct unicam_device *unicam)
+{
+	struct v4l2_fwnode_endpoint ep = { };
+	struct fwnode_handle *ep_handle;
+	struct v4l2_async_connection *asc;
+	int ret;
+
+	ret = of_property_read_u32(unicam->dev->of_node, "brcm,num-data-lanes",
+				   &unicam->max_data_lanes);
+	if (ret < 0) {
+		dev_err(unicam->dev, "Missing %s DT property\n",
+			"brcm,num-data-lanes");
+		return -EINVAL;
+	}
+
+	/* Get and parse the local endpoint. */
+	ep_handle = fwnode_graph_get_endpoint_by_id(dev_fwnode(unicam->dev), 0, 0,
+						    FWNODE_GRAPH_ENDPOINT_NEXT);
+	if (!ep_handle) {
+		dev_err(unicam->dev, "No endpoint found\n");
+		return -ENODEV;
+	}
+
+	ret = v4l2_fwnode_endpoint_parse(ep_handle, &ep);
+	if (ret) {
+		dev_err(unicam->dev, "Failed to parse endpoint: %d\n", ret);
+		goto error;
+	}
+
+	unicam->bus_type = ep.bus_type;
+
+	switch (ep.bus_type) {
+	case V4L2_MBUS_CSI2_DPHY: {
+		unsigned int num_data_lanes = ep.bus.mipi_csi2.num_data_lanes;
+
+		if (num_data_lanes != 1 && num_data_lanes != 2 &&
+		    num_data_lanes != 4) {
+			dev_err(unicam->dev, "%u data lanes not supported\n",
+				num_data_lanes);
+			goto error;
+		}
+
+		if (num_data_lanes > unicam->max_data_lanes) {
+			dev_err(unicam->dev,
+				"Endpoint uses %u data lanes when %u are supported\n",
+				num_data_lanes, unicam->max_data_lanes);
+			goto error;
+		}
+
+		unicam->max_data_lanes = num_data_lanes;
+		unicam->bus_flags = ep.bus.mipi_csi2.flags;
+		break;
+	}
+
+	case V4L2_MBUS_CCP2:
+		unicam->max_data_lanes = 1;
+		unicam->bus_flags = ep.bus.mipi_csi1.strobe;
+		break;
+
+	default:
+		/* Unsupported bus type */
+		dev_err(unicam->dev, "Unsupported bus type %u\n", ep.bus_type);
+		goto error;
+	}
+
+	/* Initialize and register the async notifier. */
+	v4l2_async_nf_init(&unicam->notifier, &unicam->v4l2_dev);
+
+	asc = v4l2_async_nf_add_fwnode_remote(&unicam->notifier, ep_handle,
+					      struct v4l2_async_connection);
+	fwnode_handle_put(ep_handle);
+	ep_handle = NULL;
+
+	if (IS_ERR(asc)) {
+		ret = PTR_ERR(asc);
+		dev_err(unicam->dev, "Failed to add entry to notifier: %d\n",
+			ret);
+		goto error;
+	}
+
+	unicam->notifier.ops = &unicam_async_ops;
+
+	ret = v4l2_async_nf_register(&unicam->notifier);
+	if (ret) {
+		dev_err(unicam->dev, "Error registering device notifier: %d\n",
+			ret);
+		goto error;
+	}
+
+	return 0;
+
+error:
+	fwnode_handle_put(ep_handle);
+	return ret;
+}
+
+/* -----------------------------------------------------------------------------
+ * Probe & remove
+ */
+
+static int unicam_media_init(struct unicam_device *unicam)
+{
+	int ret;
+
+	unicam->mdev.dev = unicam->dev;
+	strscpy(unicam->mdev.model, UNICAM_MODULE_NAME,
+		sizeof(unicam->mdev.model));
+	strscpy(unicam->mdev.serial, "", sizeof(unicam->mdev.serial));
+	unicam->mdev.hw_revision = 0;
+
+	media_device_init(&unicam->mdev);
+
+	unicam->v4l2_dev.mdev = &unicam->mdev;
+
+	ret = v4l2_device_register(unicam->dev, &unicam->v4l2_dev);
+	if (ret < 0) {
+		dev_err(unicam->dev, "Unable to register v4l2 device\n");
+		goto err_media_cleanup;
+	}
+
+	ret = media_device_register(&unicam->mdev);
+	if (ret < 0) {
+		dev_err(unicam->dev,
+			"Unable to register media-controller device\n");
+		goto err_v4l2_unregister;
+	}
+
+	return 0;
+
+err_v4l2_unregister:
+	v4l2_device_unregister(&unicam->v4l2_dev);
+err_media_cleanup:
+	media_device_cleanup(&unicam->mdev);
+	return ret;
+}
+
+static int unicam_probe(struct platform_device *pdev)
+{
+	struct unicam_device *unicam;
+	int ret;
+
+	unicam = kzalloc(sizeof(*unicam), GFP_KERNEL);
+	if (!unicam)
+		return -ENOMEM;
+
+	kref_init(&unicam->kref);
+	mutex_init(&unicam->lock);
+
+	unicam->dev = &pdev->dev;
+	platform_set_drvdata(pdev, unicam);
+
+	unicam->base = devm_platform_ioremap_resource_byname(pdev, "unicam");
+	if (IS_ERR(unicam->base)) {
+		ret = PTR_ERR(unicam->base);
+		goto err_unicam_put;
+	}
+
+	unicam->clk_gate_base = devm_platform_ioremap_resource_byname(pdev, "cmi");
+	if (IS_ERR(unicam->clk_gate_base)) {
+		ret = PTR_ERR(unicam->clk_gate_base);
+		goto err_unicam_put;
+	}
+
+	unicam->clock = devm_clk_get(&pdev->dev, "lp");
+	if (IS_ERR(unicam->clock)) {
+		dev_err(unicam->dev, "Failed to get lp clock\n");
+		ret = PTR_ERR(unicam->clock);
+		goto err_unicam_put;
+	}
+
+	unicam->vpu_clock = devm_clk_get(&pdev->dev, "vpu");
+	if (IS_ERR(unicam->vpu_clock)) {
+		dev_err(unicam->dev, "Failed to get vpu clock\n");
+		ret = PTR_ERR(unicam->vpu_clock);
+		goto err_unicam_put;
+	}
+
+	ret = platform_get_irq(pdev, 0);
+	if (ret <= 0) {
+		dev_err(&pdev->dev, "No IRQ resource\n");
+		ret = -EINVAL;
+		goto err_unicam_put;
+	}
+
+	ret = devm_request_irq(&pdev->dev, ret, unicam_isr, 0,
+			       "unicam_capture0", unicam);
+	if (ret) {
+		dev_err(&pdev->dev, "Unable to request interrupt\n");
+		ret = -EINVAL;
+		goto err_unicam_put;
+	}
+
+	/* Enable the block power domain. */
+	pm_runtime_enable(&pdev->dev);
+
+	ret = unicam_media_init(unicam);
+	if (ret)
+		goto err_pm_runtime;
+
+	ret = unicam_subdev_init(unicam);
+	if (ret)
+		goto err_media_unregister;
+
+	ret = unicam_async_nf_init(unicam);
+	if (ret)
+		goto err_subdev_unregister;
+
+	return 0;
+
+err_subdev_unregister:
+	unicam_subdev_cleanup(unicam);
+err_media_unregister:
+	media_device_unregister(&unicam->mdev);
+err_pm_runtime:
+	pm_runtime_disable(&pdev->dev);
+err_unicam_put:
+	unicam_put(unicam);
+
+	return ret;
+}
+
+static int unicam_remove(struct platform_device *pdev)
+{
+	struct unicam_device *unicam = platform_get_drvdata(pdev);
+
+	unicam_unregister_nodes(unicam);
+	v4l2_device_unregister(&unicam->v4l2_dev);
+	media_device_unregister(&unicam->mdev);
+	v4l2_async_nf_unregister(&unicam->notifier);
+
+	unicam_subdev_cleanup(unicam);
+
+	unicam_put(unicam);
+
+	pm_runtime_disable(&pdev->dev);
+
+	return 0;
+}
+
+static const struct of_device_id unicam_of_match[] = {
+	{ .compatible = "brcm,bcm2835-unicam", },
+	{ /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, unicam_of_match);
+
+static struct platform_driver unicam_driver = {
+	.probe		= unicam_probe,
+	.remove		= unicam_remove,
+	.driver = {
+		.name	= UNICAM_MODULE_NAME,
+		.pm	= pm_ptr(&unicam_pm_ops),
+		.of_match_table = of_match_ptr(unicam_of_match),
+	},
+};
+
+module_platform_driver(unicam_driver);
+
+MODULE_AUTHOR("Dave Stevenson <dave.stevenson@raspberrypi.com>");
+MODULE_DESCRIPTION("BCM2835 Unicam driver");
+MODULE_LICENSE("GPL");