diff mbox series

[v14,RESEND,1/6] dt-bindings: display: imx: Add i.MX8qxp/qm DPU binding

Message ID 20230822085949.816844-2-victor.liu@nxp.com
State New
Headers show
Series [v14,RESEND,1/6] dt-bindings: display: imx: Add i.MX8qxp/qm DPU binding | expand

Commit Message

Ying Liu Aug. 22, 2023, 8:59 a.m. UTC 
This patch adds bindings for i.MX8qxp/qm Display Processing Unit.

Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Liu Ying <victor.liu@nxp.com>
---
v7->v14:
* No change.

v6->v7:
* Add Rob's R-b tag back.

v5->v6:
* Use graph schema. So, drop Rob's R-b tag as review is needed.

v4->v5:
* No change.

v3->v4:
* Improve compatible property by using enum instead of oneOf+const. (Rob)
* Add Rob's R-b tag.

v2->v3:
* No change.

v1->v2:
* Fix yamllint warnings.
* Require bypass0 and bypass1 clocks for both i.MX8qxp and i.MX8qm, as the
  display controller subsystem spec does say that they exist.
* Use new dt binding way to add clocks in the example.
* Trivial tweaks for the example.

 .../bindings/display/imx/fsl,imx8qxp-dpu.yaml | 387 ++++++++++++++++++
 1 file changed, 387 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/imx/fsl,imx8qxp-dpu.yaml

Comments

Ying Liu Sept. 5, 2023, 3:44 a.m. UTC | #1 
On Thursday, August 24, 2023 5:48 PM, Maxime Ripard <mripard@kernel.org> wrote: 
> On Wed, Aug 23, 2023 at 08:47:51AM +0000, Ying Liu wrote:
> > > > This dt-binding just follows generic dt-binding rule to describe the DPU
> IP
> > > > hardware, not the software implementation.  DPU internal units do not
> > > > constitute separate devices.
> > >
> > > I mean, your driver does split them into separate devices so surely it
> > > constitutes separate devices.
> >
> > My driver treats them as DPU internal units, especially not Linux devices.
> >
> > Let's avoid Linuxisms when implementing this dt-binding and just be simple
> > to describe necessary stuff exposing to DPU's embodying system/SoC, like
> > reg, interrupts, clocks and power-domains.
> 
> Let's focus the conversation here, because it's redundant with the rest.
> 
> Your driver registers two additional devices, that have a different
> register space, different clocks, different interrupts, different power
> domains, etc. That has nothing to do with Linux, it's hardware
> properties.
> 
> That alone is a very good indication to me that these devices should be
> modeled as such. And your driver agrees.
> 
> Whether or not the other internal units need to be described as separate
> devices, I can't really tell, I don't have the datasheet.

i.MX8qxp and i.MX8qm SoC reference manuals can be found at(I think
registration is needed first):
https://www.nxp.com/webapp/Download?colCode=IMX8DQXPRM
https://www.nxp.com/webapp/Download?colCode=IMX8QMRM

Sorry for putting this in a short way, but the DPU is one IP, so one dt-binding.

> 
> But at least the CRTC and the interrupt controller should be split away,
> or explained and detailed far better than "well it's just convenient".

CRTC is Linuxisms, which cannot be referenced to determine dt-binding.

DPU as Display Controller is listed as a standalone module/IP in RM.
This is how the IP is designed in the first place, not for any convenient
purpose.

Regards,
Liu Ying

> 
> Maxime
Maxime Ripard Sept. 29, 2023, 1:46 p.m. UTC | #2 
On Tue, Sep 05, 2023 at 03:44:23AM +0000, Ying Liu wrote:
> On Thursday, August 24, 2023 5:48 PM, Maxime Ripard <mripard@kernel.org> wrote: 
> > On Wed, Aug 23, 2023 at 08:47:51AM +0000, Ying Liu wrote:
> > > > > This dt-binding just follows generic dt-binding rule to describe the DPU
> > IP
> > > > > hardware, not the software implementation.  DPU internal units do not
> > > > > constitute separate devices.
> > > >
> > > > I mean, your driver does split them into separate devices so surely it
> > > > constitutes separate devices.
> > >
> > > My driver treats them as DPU internal units, especially not Linux devices.
> > >
> > > Let's avoid Linuxisms when implementing this dt-binding and just be simple
> > > to describe necessary stuff exposing to DPU's embodying system/SoC, like
> > > reg, interrupts, clocks and power-domains.
> > 
> > Let's focus the conversation here, because it's redundant with the rest.
> > 
> > Your driver registers two additional devices, that have a different
> > register space, different clocks, different interrupts, different power
> > domains, etc. That has nothing to do with Linux, it's hardware
> > properties.
> > 
> > That alone is a very good indication to me that these devices should be
> > modeled as such. And your driver agrees.
> > 
> > Whether or not the other internal units need to be described as separate
> > devices, I can't really tell, I don't have the datasheet.
> 
> i.MX8qxp and i.MX8qm SoC reference manuals can be found at(I think
> registration is needed first):
> https://www.nxp.com/webapp/Download?colCode=IMX8DQXPRM
> https://www.nxp.com/webapp/Download?colCode=IMX8QMRM

I tried, but the registration is buggy. The email takes longer than the
timeout to be sent.

> Sorry for putting this in a short way, but the DPU is one IP, so one dt-binding.
> 
> > 
> > But at least the CRTC and the interrupt controller should be split away,
> > or explained and detailed far better than "well it's just convenient".
> 
> CRTC is Linuxisms, which cannot be referenced to determine dt-binding.
> 
> DPU as Display Controller is listed as a standalone module/IP in RM.
> This is how the IP is designed in the first place, not for any convenient
> purpose.

Sure, but pushing that argument further, the entire SoC has been
designed as a single entity.

Every vendor out there designs its display pipeline in its entirety and
not block by block. This doesn't mean that it isn't composed of several
mostly discrete components.

If it has a separate address space, clock and interrupt, it's a
different device, no matter how it was designed or what the intent was.

Maxime
diff mbox series

Patch

diff --git a/Documentation/devicetree/bindings/display/imx/fsl,imx8qxp-dpu.yaml b/Documentation/devicetree/bindings/display/imx/fsl,imx8qxp-dpu.yaml
new file mode 100644
index 000000000000..6b05c586cd9d
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/imx/fsl,imx8qxp-dpu.yaml
@@ -0,0 +1,387 @@ 
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/imx/fsl,imx8qxp-dpu.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Freescale i.MX8qm/qxp Display Processing Unit
+
+maintainers:
+  - Liu Ying <victor.liu@nxp.com>
+
+description: |
+  The Freescale i.MX8qm/qxp Display Processing Unit(DPU) is comprised of two
+  main components that include a blit engine for 2D graphics accelerations
+  and a display controller for display output processing, as well as a command
+  sequencer.
+
+properties:
+  compatible:
+    enum:
+      - fsl,imx8qxp-dpu
+      - fsl,imx8qm-dpu
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    items:
+      - description: |
+          store9 shadow load interrupt(blit engine)
+      - description: |
+          store9 frame complete interrupt(blit engine)
+      - description: |
+          store9 sequence complete interrupt(blit engine)
+      - description: |
+          extdst0 shadow load interrupt
+          (display controller, content stream 0)
+      - description: |
+          extdst0 frame complete interrupt
+          (display controller, content stream 0)
+      - description: |
+          extdst0 sequence complete interrupt
+          (display controller, content stream 0)
+      - description: |
+          extdst4 shadow load interrupt
+          (display controller, safety stream 0)
+      - description: |
+          extdst4 frame complete interrupt
+          (display controller, safety stream 0)
+      - description: |
+          extdst4 sequence complete interrupt
+          (display controller, safety stream 0)
+      - description: |
+          extdst1 shadow load interrupt
+          (display controller, content stream 1)
+      - description: |
+          extdst1 frame complete interrupt
+          (display controller, content stream 1)
+      - description: |
+          extdst1 sequence complete interrupt
+          (display controller, content stream 1)
+      - description: |
+          extdst5 shadow load interrupt
+          (display controller, safety stream 1)
+      - description: |
+          extdst5 frame complete interrupt
+          (display controller, safety stream 1)
+      - description: |
+          extdst5 sequence complete interrupt
+          (display controller, safety stream 1)
+      - description: |
+          disengcfg0 shadow load interrupt
+          (display controller, display stream 0)
+      - description: |
+          disengcfg0 frame complete interrupt
+          (display controller, display stream 0)
+      - description: |
+          disengcfg0 sequence complete interrupt
+          (display controller, display stream 0)
+      - description: |
+          framegen0 programmable interrupt0
+          (display controller, display stream 0)
+      - description: |
+          framegen0 programmable interrupt1
+          (display controller, display stream 0)
+      - description: |
+          framegen0 programmable interrupt2
+          (display controller, display stream 0)
+      - description: |
+          framegen0 programmable interrupt3
+          (display controller, display stream 0)
+      - description: |
+          signature0 shadow load interrupt
+          (display controller, display stream 0)
+      - description: |
+          signature0 measurement valid interrupt
+          (display controller, display stream 0)
+      - description: |
+          signature0 error condition interrupt
+          (display controller, display stream 0)
+      - description: |
+          disengcfg1 shadow load interrupt
+          (display controller, display stream 1)
+      - description: |
+          disengcfg1 frame complete interrupt
+          (display controller, display stream 1)
+      - description: |
+          disengcfg1 sequence complete interrupt
+          (display controller, display stream 1)
+      - description: |
+          framegen1 programmable interrupt0
+          (display controller, display stream 1)
+      - description: |
+          framegen1 programmable interrupt1
+          (display controller, display stream 1)
+      - description: |
+          framegen1 programmable interrupt2
+          (display controller, display stream 1)
+      - description: |
+          framegen1 programmable interrupt3
+          (display controller, display stream 1)
+      - description: |
+          signature1 shadow load interrupt
+          (display controller, display stream 1)
+      - description: |
+          signature1 measurement valid interrupt
+          (display controller, display stream 1)
+      - description: |
+          signature1 error condition interrupt
+          (display controller, display stream 1)
+      - description: |
+          command sequencer error condition interrupt(command sequencer)
+      - description: |
+          common control software interrupt0(common control)
+      - description: |
+          common control software interrupt1(common control)
+      - description: |
+          common control software interrupt2(common control)
+      - description: |
+          common control software interrupt3(common control)
+      - description: |
+          framegen0 synchronization status activated interrupt
+          (display controller, safety stream 0)
+      - description: |
+          framegen0 synchronization status deactivated interrupt
+          (display controller, safety stream 0)
+      - description: |
+          framegen0 synchronization status activated interrupt
+          (display controller, content stream 0)
+      - description: |
+          framegen0 synchronization status deactivated interrupt
+          (display controller, content stream 0)
+      - description: |
+          framegen1 synchronization status activated interrupt
+          (display controller, safety stream 1)
+      - description: |
+          framegen1 synchronization status deactivated interrupt
+          (display controller, safety stream 1)
+      - description: |
+          framegen1 synchronization status activated interrupt
+          (display controller, content stream 1)
+      - description: |
+          framegen1 synchronization status deactivated interrupt
+          (display controller, content stream 1)
+
+  interrupt-names:
+    items:
+      - const: store9_shdload
+      - const: store9_framecomplete
+      - const: store9_seqcomplete
+      - const: extdst0_shdload
+      - const: extdst0_framecomplete
+      - const: extdst0_seqcomplete
+      - const: extdst4_shdload
+      - const: extdst4_framecomplete
+      - const: extdst4_seqcomplete
+      - const: extdst1_shdload
+      - const: extdst1_framecomplete
+      - const: extdst1_seqcomplete
+      - const: extdst5_shdload
+      - const: extdst5_framecomplete
+      - const: extdst5_seqcomplete
+      - const: disengcfg_shdload0
+      - const: disengcfg_framecomplete0
+      - const: disengcfg_seqcomplete0
+      - const: framegen0_int0
+      - const: framegen0_int1
+      - const: framegen0_int2
+      - const: framegen0_int3
+      - const: sig0_shdload
+      - const: sig0_valid
+      - const: sig0_error
+      - const: disengcfg_shdload1
+      - const: disengcfg_framecomplete1
+      - const: disengcfg_seqcomplete1
+      - const: framegen1_int0
+      - const: framegen1_int1
+      - const: framegen1_int2
+      - const: framegen1_int3
+      - const: sig1_shdload
+      - const: sig1_valid
+      - const: sig1_error
+      - const: cmdseq_error
+      - const: comctrl_sw0
+      - const: comctrl_sw1
+      - const: comctrl_sw2
+      - const: comctrl_sw3
+      - const: framegen0_primsync_on
+      - const: framegen0_primsync_off
+      - const: framegen0_secsync_on
+      - const: framegen0_secsync_off
+      - const: framegen1_primsync_on
+      - const: framegen1_primsync_off
+      - const: framegen1_secsync_on
+      - const: framegen1_secsync_off
+
+  clocks:
+    maxItems: 8
+
+  clock-names:
+    items:
+      - const: axi
+      - const: cfg
+      - const: pll0
+      - const: pll1
+      - const: bypass0
+      - const: bypass1
+      - const: disp0
+      - const: disp1
+
+  power-domains:
+    items:
+      - description: DC power-domain
+      - description: PLL0 power-domain
+      - description: PLL1 power-domain
+
+  power-domain-names:
+    items:
+      - const: dc
+      - const: pll0
+      - const: pll1
+
+  fsl,dpr-channels:
+    $ref: /schemas/types.yaml#/definitions/phandle-array
+    description: |
+      List of phandle which points to DPR channels associated with
+      this DPU instance.
+
+  ports:
+    $ref: /schemas/graph.yaml#/properties/ports
+
+    properties:
+      port@0:
+        $ref: /schemas/graph.yaml#/properties/port
+        description: The DPU output port node from display stream0.
+
+      port@1:
+        $ref: /schemas/graph.yaml#/properties/port
+        description: The DPU output port node from display stream1.
+
+    required:
+      - port@0
+      - port@1
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - interrupt-names
+  - clocks
+  - clock-names
+  - power-domains
+  - power-domain-names
+  - fsl,dpr-channels
+  - ports
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/imx8-lpcg.h>
+    #include <dt-bindings/firmware/imx/rsrc.h>
+    dpu@56180000 {
+        compatible = "fsl,imx8qxp-dpu";
+        reg = <0x56180000 0x40000>;
+        interrupt-parent = <&dc0_irqsteer>;
+        interrupts = <448>, <449>, <450>,  <64>,
+                      <65>,  <66>,  <67>,  <68>,
+                      <69>,  <70>, <193>, <194>,
+                     <195>, <196>, <197>,  <72>,
+                      <73>,  <74>,  <75>,  <76>,
+                      <77>,  <78>,  <79>,  <80>,
+                      <81>, <199>, <200>, <201>,
+                     <202>, <203>, <204>, <205>,
+                     <206>, <207>, <208>,   <0>,
+                       <1>,   <2>,   <3>,   <4>,
+                      <82>,  <83>,  <84>,  <85>,
+                     <209>, <210>, <211>, <212>;
+        interrupt-names = "store9_shdload",
+                          "store9_framecomplete",
+                          "store9_seqcomplete",
+                          "extdst0_shdload",
+                          "extdst0_framecomplete",
+                          "extdst0_seqcomplete",
+                          "extdst4_shdload",
+                          "extdst4_framecomplete",
+                          "extdst4_seqcomplete",
+                          "extdst1_shdload",
+                          "extdst1_framecomplete",
+                          "extdst1_seqcomplete",
+                          "extdst5_shdload",
+                          "extdst5_framecomplete",
+                          "extdst5_seqcomplete",
+                          "disengcfg_shdload0",
+                          "disengcfg_framecomplete0",
+                          "disengcfg_seqcomplete0",
+                          "framegen0_int0",
+                          "framegen0_int1",
+                          "framegen0_int2",
+                          "framegen0_int3",
+                          "sig0_shdload",
+                          "sig0_valid",
+                          "sig0_error",
+                          "disengcfg_shdload1",
+                          "disengcfg_framecomplete1",
+                          "disengcfg_seqcomplete1",
+                          "framegen1_int0",
+                          "framegen1_int1",
+                          "framegen1_int2",
+                          "framegen1_int3",
+                          "sig1_shdload",
+                          "sig1_valid",
+                          "sig1_error",
+                          "cmdseq_error",
+                          "comctrl_sw0",
+                          "comctrl_sw1",
+                          "comctrl_sw2",
+                          "comctrl_sw3",
+                          "framegen0_primsync_on",
+                          "framegen0_primsync_off",
+                          "framegen0_secsync_on",
+                          "framegen0_secsync_off",
+                          "framegen1_primsync_on",
+                          "framegen1_primsync_off",
+                          "framegen1_secsync_on",
+                          "framegen1_secsync_off";
+        clocks = <&dc0_dpu_lpcg IMX_LPCG_CLK_5>,
+                 <&dc0_dpu_lpcg IMX_LPCG_CLK_4>,
+                 <&clk IMX_SC_R_DC_0_PLL_0 IMX_SC_PM_CLK_PLL>,
+                 <&clk IMX_SC_R_DC_0_PLL_1 IMX_SC_PM_CLK_PLL>,
+                 <&clk IMX_SC_R_DC_0_VIDEO0 IMX_SC_PM_CLK_BYPASS>,
+                 <&clk IMX_SC_R_DC_0_VIDEO1 IMX_SC_PM_CLK_BYPASS>,
+                 <&dc0_disp_lpcg IMX_LPCG_CLK_0>,
+                 <&dc0_disp_lpcg IMX_LPCG_CLK_1>;
+        clock-names = "axi", "cfg",
+                      "pll0", "pll1", "bypass0", "bypass1",
+                      "disp0", "disp1";
+        power-domains = <&pd IMX_SC_R_DC_0>,
+                        <&pd IMX_SC_R_DC_0_PLL_0>,
+                        <&pd IMX_SC_R_DC_0_PLL_1>;
+        power-domain-names = "dc", "pll0", "pll1";
+        fsl,dpr-channels = <&dc0_dpr1_channel1>,
+                           <&dc0_dpr1_channel2>,
+                           <&dc0_dpr1_channel3>,
+                           <&dc0_dpr2_channel1>,
+                           <&dc0_dpr2_channel2>,
+                           <&dc0_dpr2_channel3>;
+
+        ports {
+            #address-cells = <1>;
+            #size-cells = <0>;
+
+            port@0 {
+                reg = <0>;
+                dpu0_disp0_pixel_combiner0_ch0: endpoint {
+                    remote-endpoint = <&pixel_combiner0_ch0_dpu0_disp0>;
+                };
+            };
+
+            port@1 {
+                reg = <1>;
+                dpu0_disp1_pixel_combiner0_ch1: endpoint {
+                    remote-endpoint = <&pixel_combiner0_ch1_dpu0_disp1>;
+                };
+            };
+        };
+    };