| Message ID | 914978925d34cfb5bee10fe92603f98763af48b0.1730123575.git.andrea.porta@suse.com |
|---|---|
| State | New |
| Headers | show |
| Series | Add support for RaspberryPi RP1 PCI device using a DT overlay | expand |
On Mon, Oct 28, 2024 at 03:07:18PM +0100, Andrea della Porta wrote: > Add device tree bindings for the clock generator found in RP1 multi > function device, and relative entries in MAINTAINERS file. > > Signed-off-by: Andrea della Porta <andrea.porta@suse.com> > --- > .../clock/raspberrypi,rp1-clocks.yaml | 62 +++++++++++++++++++ > MAINTAINERS | 6 ++ > .../clock/raspberrypi,rp1-clocks.h | 61 ++++++++++++++++++ > 3 files changed, 129 insertions(+) > create mode 100644 Documentation/devicetree/bindings/clock/raspberrypi,rp1-clocks.yaml > create mode 100644 include/dt-bindings/clock/raspberrypi,rp1-clocks.h > > diff --git a/Documentation/devicetree/bindings/clock/raspberrypi,rp1-clocks.yaml b/Documentation/devicetree/bindings/clock/raspberrypi,rp1-clocks.yaml > new file mode 100644 > index 000000000000..a123dd619f8e > --- /dev/null > +++ b/Documentation/devicetree/bindings/clock/raspberrypi,rp1-clocks.yaml > @@ -0,0 +1,62 @@ > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) > +%YAML 1.2 > +--- > +$id: http://devicetree.org/schemas/clock/raspberrypi,rp1-clocks.yaml# > +$schema: http://devicetree.org/meta-schemas/core.yaml# > + > +title: RaspberryPi RP1 clock generator > + > +maintainers: > + - Andrea della Porta <andrea.porta@suse.com> > + > +description: | > + The RP1 contains a clock generator designed as three PLLs (CORE, AUDIO, > + VIDEO), and each PLL output can be programmed though dividers to generate > + the clocks to drive the sub-peripherals embedded inside the chipset. > + > + Link to datasheet: > + https://datasheets.raspberrypi.com/rp1/rp1-peripherals.pdf > + > +properties: > + compatible: > + const: raspberrypi,rp1-clocks > + > + reg: > + maxItems: 1 > + > + '#clock-cells': > + description: > + The index in the assigned-clocks is mapped to the output clock as per > + definitions in include/dt-bindings/clock/raspberrypi,rp1-clocks.h. You still describe how current driver matches assigned-clocks to your output clocks. That's not the property of clock-cells and that's not how assigned-clocks work. There are no assigned clocks in your DTS, so this is really irrelevant (or not correct, choose). > + const: 1 > + > + clocks: > + maxItems: 1 > + > + clock-names: > + const: xosc What is the purpose of clock-names if you do not use it? Drop. > + > +required: > + - compatible > + - reg > + - '#clock-cells' > + - clocks > + > +additionalProperties: false > + > +examples: > + - | > + #include <dt-bindings/clock/raspberrypi,rp1-clocks.h> > + > + rp1 { > + #address-cells = <2>; > + #size-cells = <2>; > + > + clocks@c040018000 { > + compatible = "raspberrypi,rp1-clocks"; > + reg = <0xc0 0x40018000 0x0 0x10038>; > + #clock-cells = <1>; > + clocks = <&clk_rp1_xosc>; > + clock-names = "xosc"; Only one space after '='. Best regards, Krzysztof
Hi Krzysztof, On 10:16 Thu 31 Oct , Andrea della Porta wrote: > Hi Krzysztof, > > On 08:23 Tue 29 Oct , Krzysztof Kozlowski wrote: > > On Mon, Oct 28, 2024 at 03:07:18PM +0100, Andrea della Porta wrote: > > > Add device tree bindings for the clock generator found in RP1 multi > > > function device, and relative entries in MAINTAINERS file. > > > > > > Signed-off-by: Andrea della Porta <andrea.porta@suse.com> > > > --- > > > .../clock/raspberrypi,rp1-clocks.yaml | 62 +++++++++++++++++++ > > > MAINTAINERS | 6 ++ > > > .../clock/raspberrypi,rp1-clocks.h | 61 ++++++++++++++++++ > > > 3 files changed, 129 insertions(+) > > > create mode 100644 Documentation/devicetree/bindings/clock/raspberrypi,rp1-clocks.yaml > > > create mode 100644 include/dt-bindings/clock/raspberrypi,rp1-clocks.h > > > > > > diff --git a/Documentation/devicetree/bindings/clock/raspberrypi,rp1-clocks.yaml b/Documentation/devicetree/bindings/clock/raspberrypi,rp1-clocks.yaml > > > new file mode 100644 > > > index 000000000000..a123dd619f8e > > > --- /dev/null > > > +++ b/Documentation/devicetree/bindings/clock/raspberrypi,rp1-clocks.yaml > > > @@ -0,0 +1,62 @@ > > > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) > > > +%YAML 1.2 > > > +--- > > > +$id: http://devicetree.org/schemas/clock/raspberrypi,rp1-clocks.yaml# > > > +$schema: http://devicetree.org/meta-schemas/core.yaml# > > > + > > > +title: RaspberryPi RP1 clock generator > > > + > > > +maintainers: > > > + - Andrea della Porta <andrea.porta@suse.com> > > > + > > > +description: | > > > + The RP1 contains a clock generator designed as three PLLs (CORE, AUDIO, > > > + VIDEO), and each PLL output can be programmed though dividers to generate > > > + the clocks to drive the sub-peripherals embedded inside the chipset. > > > + > > > + Link to datasheet: > > > + https://datasheets.raspberrypi.com/rp1/rp1-peripherals.pdf > > > + > > > +properties: > > > + compatible: > > > + const: raspberrypi,rp1-clocks > > > + > > > + reg: > > > + maxItems: 1 > > > + > > > + '#clock-cells': > > > + description: > > > + The index in the assigned-clocks is mapped to the output clock as per > > > + definitions in include/dt-bindings/clock/raspberrypi,rp1-clocks.h. > > > > You still describe how current driver matches assigned-clocks to your > > output clocks. That's not the property of clock-cells and that's not how > > assigned-clocks work. > > This description is taken by another upstream binding, please see > Documentation/devicetree/bindings/clock/renesas,5p35023.yaml > > Its purpose is to let the user know how clock-cell number specified > in assigned-clocks is mapped to the clock provided by this generator. > Since some of these clocks are shared among peripherals, their frequency > cannot be set by consumers, so it's the provider itself (i.e. the clock > device described with this binding) that should take care of them. > The renesas example has assigned-clocks specified though, please see below. > > > > > There are no assigned clocks in your DTS, so this is really irrelevant > > (or not correct, choose). > > In the first revision of this patchset (please see [1] and following messages) > I had the assigned-clocks setup in the example while trying to explain their > purpose, but Conor said those didn't seem to be relevant, hence I dropped them. > Maybe I had to be more incisive on that. > So, I'd be inclined to retain the description as it is and reintroduce some > assigned-clocks in the example as in the renesas one, would it be ok for you? Since I'm on the verge of producing a new patchset revision, may I kindly ask some comments on this? Is it ok for you? Many thanks, Andrea > > > > > > > > + const: 1 > > > + > > > + clocks: > > > + maxItems: 1 > > > + > > > + clock-names: > > > + const: xosc > > > > What is the purpose of clock-names if you do not use it? Drop. > > Ack. > > > > > > + > > > +required: > > > + - compatible > > > + - reg > > > + - '#clock-cells' > > > + - clocks > > > + > > > +additionalProperties: false > > > + > > > +examples: > > > + - | > > > + #include <dt-bindings/clock/raspberrypi,rp1-clocks.h> > > > + > > > + rp1 { > > > + #address-cells = <2>; > > > + #size-cells = <2>; > > > + > > > + clocks@c040018000 { > > > + compatible = "raspberrypi,rp1-clocks"; > > > + reg = <0xc0 0x40018000 0x0 0x10038>; > > > + #clock-cells = <1>; > > > + clocks = <&clk_rp1_xosc>; > > > + clock-names = "xosc"; > > > > Only one space after '='. > > I will drop the name since the driver will not refer to it via clk_get() > but will use clk_parent_data::index. > > Many thanks, > Andrea > > [1] - https://lore.kernel.org/all/20240822-refutable-railroad-a3f111ab1e3f@spud/ > > > > > Best regards, > > Krzysztof > >
Quoting Andrea della Porta (2024-11-15 03:31:45) > On 10:16 Thu 31 Oct , Andrea della Porta wrote: > > On 08:23 Tue 29 Oct , Krzysztof Kozlowski wrote: > > > > + '#clock-cells': > > > > + description: > > > > + The index in the assigned-clocks is mapped to the output clock as per > > > > + definitions in include/dt-bindings/clock/raspberrypi,rp1-clocks.h. > > > > > > You still describe how current driver matches assigned-clocks to your > > > output clocks. That's not the property of clock-cells and that's not how > > > assigned-clocks work. > > > > This description is taken by another upstream binding, please see > > Documentation/devicetree/bindings/clock/renesas,5p35023.yaml > > > > Its purpose is to let the user know how clock-cell number specified > > in assigned-clocks is mapped to the clock provided by this generator. > > Since some of these clocks are shared among peripherals, their frequency > > cannot be set by consumers, so it's the provider itself (i.e. the clock > > device described with this binding) that should take care of them. > > The renesas example has assigned-clocks specified though, please see below. > > > > > > > > There are no assigned clocks in your DTS, so this is really irrelevant > > > (or not correct, choose). > > > > In the first revision of this patchset (please see [1] and following messages) > > I had the assigned-clocks setup in the example while trying to explain their > > purpose, but Conor said those didn't seem to be relevant, hence I dropped them. > > Maybe I had to be more incisive on that. > > So, I'd be inclined to retain the description as it is and reintroduce some > > assigned-clocks in the example as in the renesas one, would it be ok for you? > > Since I'm on the verge of producing a new patchset revision, may I kindly ask > some comments on this? Is it ok for you? > Everyone knows how #clock-cells works. It shouldn't need a description about how it works. It should just point at the header file with the numbers if anything.
diff --git a/Documentation/devicetree/bindings/clock/raspberrypi,rp1-clocks.yaml b/Documentation/devicetree/bindings/clock/raspberrypi,rp1-clocks.yaml new file mode 100644 index 000000000000..a123dd619f8e --- /dev/null +++ b/Documentation/devicetree/bindings/clock/raspberrypi,rp1-clocks.yaml @@ -0,0 +1,62 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/clock/raspberrypi,rp1-clocks.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: RaspberryPi RP1 clock generator + +maintainers: + - Andrea della Porta <andrea.porta@suse.com> + +description: | + The RP1 contains a clock generator designed as three PLLs (CORE, AUDIO, + VIDEO), and each PLL output can be programmed though dividers to generate + the clocks to drive the sub-peripherals embedded inside the chipset. + + Link to datasheet: + https://datasheets.raspberrypi.com/rp1/rp1-peripherals.pdf + +properties: + compatible: + const: raspberrypi,rp1-clocks + + reg: + maxItems: 1 + + '#clock-cells': + description: + The index in the assigned-clocks is mapped to the output clock as per + definitions in include/dt-bindings/clock/raspberrypi,rp1-clocks.h. + const: 1 + + clocks: + maxItems: 1 + + clock-names: + const: xosc + +required: + - compatible + - reg + - '#clock-cells' + - clocks + +additionalProperties: false + +examples: + - | + #include <dt-bindings/clock/raspberrypi,rp1-clocks.h> + + rp1 { + #address-cells = <2>; + #size-cells = <2>; + + clocks@c040018000 { + compatible = "raspberrypi,rp1-clocks"; + reg = <0xc0 0x40018000 0x0 0x10038>; + #clock-cells = <1>; + clocks = <&clk_rp1_xosc>; + clock-names = "xosc"; + }; + }; diff --git a/MAINTAINERS b/MAINTAINERS index c27f3190737f..75a66e3e34c9 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -19380,6 +19380,12 @@ F: Documentation/devicetree/bindings/media/raspberrypi,pispbe.yaml F: drivers/media/platform/raspberrypi/pisp_be/ F: include/uapi/linux/media/raspberrypi/ +RASPBERRY PI RP1 PCI DRIVER +M: Andrea della Porta <andrea.porta@suse.com> +S: Maintained +F: Documentation/devicetree/bindings/clock/raspberrypi,rp1-clocks.yaml +F: include/dt-bindings/clock/rp1.h + RC-CORE / LIRC FRAMEWORK M: Sean Young <sean@mess.org> L: linux-media@vger.kernel.org diff --git a/include/dt-bindings/clock/raspberrypi,rp1-clocks.h b/include/dt-bindings/clock/raspberrypi,rp1-clocks.h new file mode 100644 index 000000000000..248efb895f35 --- /dev/null +++ b/include/dt-bindings/clock/raspberrypi,rp1-clocks.h @@ -0,0 +1,61 @@ +/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) */ +/* + * Copyright (C) 2021 Raspberry Pi Ltd. + */ + +#ifndef __DT_BINDINGS_CLOCK_RASPBERRYPI_RP1 +#define __DT_BINDINGS_CLOCK_RASPBERRYPI_RP1 + +#define RP1_PLL_SYS_CORE 0 +#define RP1_PLL_AUDIO_CORE 1 +#define RP1_PLL_VIDEO_CORE 2 + +#define RP1_PLL_SYS 3 +#define RP1_PLL_AUDIO 4 +#define RP1_PLL_VIDEO 5 + +#define RP1_PLL_SYS_PRI_PH 6 +#define RP1_PLL_SYS_SEC_PH 7 +#define RP1_PLL_AUDIO_PRI_PH 8 + +#define RP1_PLL_SYS_SEC 9 +#define RP1_PLL_AUDIO_SEC 10 +#define RP1_PLL_VIDEO_SEC 11 + +#define RP1_CLK_SYS 12 +#define RP1_CLK_SLOW_SYS 13 +#define RP1_CLK_DMA 14 +#define RP1_CLK_UART 15 +#define RP1_CLK_ETH 16 +#define RP1_CLK_PWM0 17 +#define RP1_CLK_PWM1 18 +#define RP1_CLK_AUDIO_IN 19 +#define RP1_CLK_AUDIO_OUT 20 +#define RP1_CLK_I2S 21 +#define RP1_CLK_MIPI0_CFG 22 +#define RP1_CLK_MIPI1_CFG 23 +#define RP1_CLK_PCIE_AUX 24 +#define RP1_CLK_USBH0_MICROFRAME 25 +#define RP1_CLK_USBH1_MICROFRAME 26 +#define RP1_CLK_USBH0_SUSPEND 27 +#define RP1_CLK_USBH1_SUSPEND 28 +#define RP1_CLK_ETH_TSU 29 +#define RP1_CLK_ADC 30 +#define RP1_CLK_SDIO_TIMER 31 +#define RP1_CLK_SDIO_ALT_SRC 32 +#define RP1_CLK_GP0 33 +#define RP1_CLK_GP1 34 +#define RP1_CLK_GP2 35 +#define RP1_CLK_GP3 36 +#define RP1_CLK_GP4 37 +#define RP1_CLK_GP5 38 +#define RP1_CLK_VEC 39 +#define RP1_CLK_DPI 40 +#define RP1_CLK_MIPI0_DPI 41 +#define RP1_CLK_MIPI1_DPI 42 + +/* Extra PLL output channels - RP1B0 only */ +#define RP1_PLL_VIDEO_PRI_PH 43 +#define RP1_PLL_AUDIO_TERN 44 + +#endif
Add device tree bindings for the clock generator found in RP1 multi function device, and relative entries in MAINTAINERS file. Signed-off-by: Andrea della Porta <andrea.porta@suse.com> --- .../clock/raspberrypi,rp1-clocks.yaml | 62 +++++++++++++++++++ MAINTAINERS | 6 ++ .../clock/raspberrypi,rp1-clocks.h | 61 ++++++++++++++++++ 3 files changed, 129 insertions(+) create mode 100644 Documentation/devicetree/bindings/clock/raspberrypi,rp1-clocks.yaml create mode 100644 include/dt-bindings/clock/raspberrypi,rp1-clocks.h