linux-kernel - Re: [PATCH v3 1/8] dt-bindings: Document STM32 DCMI bindings

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Date:   Mon, 10 Apr 2017 10:20:25 -0500
From:   Rob Herring <robh@...nel.org>
To:     Hugues Fruchet <hugues.fruchet@...com>
Cc:     Mark Rutland <mark.rutland@....com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Hans Verkuil <hverkuil@...all.nl>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-media@...r.kernel.org,
        Benjamin Gaignard <benjamin.gaignard@...aro.org>,
        Yannick Fertre <yannick.fertre@...com>
Subject: Re: [PATCH v3 1/8] dt-bindings: Document STM32 DCMI bindings

On Tue, Apr 04, 2017 at 05:44:31PM +0200, Hugues Fruchet wrote:
> This adds documentation of device tree bindings for the STM32 DCMI
> (Digital Camera Memory Interface).
> 
> Signed-off-by: Hugues Fruchet <hugues.fruchet@...com>
> ---
>  .../devicetree/bindings/media/st,stm32-dcmi.txt    | 46 ++++++++++++++++++++++
>  1 file changed, 46 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/media/st,stm32-dcmi.txt

One nit below, otherwise:

Acked-by: Rob Herring <robh@...nel.org>

> 
> diff --git a/Documentation/devicetree/bindings/media/st,stm32-dcmi.txt b/Documentation/devicetree/bindings/media/st,stm32-dcmi.txt
> new file mode 100644
> index 0000000..c0f6f4b
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/st,stm32-dcmi.txt
> @@ -0,0 +1,46 @@
> +STMicroelectronics STM32 Digital Camera Memory Interface (DCMI)
> +
> +Required properties:
> +- compatible: "st,stm32-dcmi"
> +- reg: physical base address and length of the registers set for the device
> +- interrupts: should contain IRQ line for the DCMI
> +- resets: reference to a reset controller,
> +          see Documentation/devicetree/bindings/reset/st,stm32-rcc.txt
> +- clocks: list of clock specifiers, corresponding to entries in
> +          the clock-names property
> +- clock-names: must contain "mclk", which is the DCMI peripherial clock
> +- pinctrl: the pincontrol settings to configure muxing properly
> +           for pins that connect to DCMI device.
> +           See Documentation/devicetree/bindings/pinctrl/st,stm32-pinctrl.txt.
> +- dmas: phandle to DMA controller node,
> +        see Documentation/devicetree/bindings/dma/stm32-dma.txt
> +- dma-names: must contain "tx", which is the transmit channel from DCMI to DMA
> +
> +DCMI supports a single port node with parallel bus. It should contain one
> +'port' child node with child 'endpoint' node. Please refer to the bindings
> +defined in Documentation/devicetree/bindings/media/video-interfaces.txt.
> +
> +Example:
> +
> +	dcmi: dcmi@...50000 {
> +		compatible = "st,stm32-dcmi";
> +		reg = <0x50050000 0x400>;
> +		interrupts = <78>;
> +		resets = <&rcc STM32F4_AHB2_RESET(DCMI)>;
> +		clocks = <&rcc 0 STM32F4_AHB2_CLOCK(DCMI)>;
> +		clock-names = "mclk";
> +		pinctrl-names = "default";
> +		pinctrl-0 = <&dcmi_pins>;
> +		dmas = <&dma2 1 1 0x414 0x3>;
> +		dma-names = "tx";
> +		port {
> +			dcmi_0: endpoint@0 {

Unit address in not valid without a reg prop, so drop it.

> +				remote-endpoint = <...>;
> +				bus-width = <8>;
> +				hsync-active = <0>;
> +				vsync-active = <0>;
> +				pclk-sample = <1>;
> +			};
> +		};
> +	};
> +
> -- 
> 1.9.1
>