linux-kernel - Re: [PATCH v2 1/8] dt-bindings: Document STM32 DCMI bindings

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Date:   Tue, 4 Apr 2017 15:45:17 +0000
From:   Hugues FRUCHET <hugues.fruchet@...com>
To:     Rob Herring <robh@...nel.org>
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" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
        Benjamin Gaignard <benjamin.gaignard@...aro.org>,
        Yannick FERTRE <yannick.fertre@...com>
Subject: Re: [PATCH v2 1/8] dt-bindings: Document STM32 DCMI bindings

Thanks Rob for review, find answers below.

On 04/03/2017 06:23 PM, Rob Herring wrote:
> On Thu, Mar 30, 2017 at 05:27:40PM +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    | 85 ++++++++++++++++++++++
>>  1 file changed, 85 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/media/st,stm32-dcmi.txt
>>
>> 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..8180f63
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/media/st,stm32-dcmi.txt
>> @@ -0,0 +1,85 @@
>> +STMicroelectronics STM32 Digital Camera Memory Interface (DCMI)
>> +
>> +Required properties:
>> +- compatible: "st,stm32-dcmi"
>
> Same block and same errata on all stm32 variants?

Yes, it is the same IP block on all stm32 variants.

>
>> +- reg: physical base address and length of the registers set for the device
>> +- interrupts: should contain IRQ line for the DCMI
>> +- clocks: list of clock specifiers, corresponding to entries in
>> +          the clock-names property
>> +- clock-names: must contain "mclk", which is the DCMI peripherial clock
>> +- resets: reference to a reset controller
>> +- reset-names: see Documentation/devicetree/bindings/reset/st,stm32-rcc.txt
>> +
>> +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:
>> +
>> +Device node 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>;
>
> Not documented.

Fixed in v3.

>
>> +		dmas = <&dma2 1 1 0x414 0x3>;
>> +		dma-names = "tx";
>
> Not documented.

Fixed in v3.

>
>> +		status = "disabled";
>
> Drop status from examples.

Fixed in v3.

>
>> +	};
>> +
>> +Board setup example
>
> Please don't split examples. That's just source level details and not
> part of the ABI.

Fixed in v3.

>
>> +-------------------
>> +This example is extracted from STM32F429-EVAL board devicetree.
>> +Please note that on this board, the camera sensor reset & power-down
>> +line level are inverted (so reset is active high and power-down is
>> +active low).
>> +
>> +/ {
>> +	[...]
>> +	clocks {
>> +		clk_ext_camera: clk-ext-camera {
>> +			#clock-cells = <0>;
>> +			compatible = "fixed-clock";
>> +			clock-frequency = <24000000>;
>> +		};
>> +	};
>> +	[...]
>> +};
>> +
>> +&dcmi {
>> +	status = "okay";
>> +
>> +	port {
>> +		dcmi_0: endpoint@0 {
>> +			remote-endpoint = <&ov2640_0>;
>> +			bus-width = <8>;
>> +			hsync-active = <0>;
>> +			vsync-active = <0>;
>> +			pclk-sample = <1>;
>> +		};
>> +	};
>> +};
>> +
>> +&i2c@1 {
>> +	[...]
>> +	ov2640: camera@30 {
>> +		compatible = "ovti,ov2640";
>> +		reg = <0x30>;
>> +		resetb-gpios = <&stmpegpio 2 GPIO_ACTIVE_HIGH>;
>> +		pwdn-gpios = <&stmpegpio 0 GPIO_ACTIVE_LOW>;
>> +		clocks = <&clk_ext_camera>;
>> +		clock-names = "xvclk";
>> +		status = "okay";
>> +
>> +		port {
>> +			ov2640_0: endpoint {
>> +				remote-endpoint = <&dcmi_0>;
>> +			};
>> +		};
>> +	};
>> +};
>> --
>> 1.9.1
>>