linux-kernel - Re: [PATCH v4 2/2] [media] atmel-isc: DT binding for Image Sensor Controller driver

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Date:	Wed, 8 Jun 2016 23:57:53 +0200
From:	Boris Brezillon <boris.brezillon@...e-electrons.com>
To:	Songjun Wu <songjun.wu@...el.com>
Cc:	<laurent.pinchart@...asonboard.com>, <nicolas.ferre@...el.com>,
	<alexandre.belloni@...e-electrons.com>, <robh@...nel.org>,
	<devicetree@...r.kernel.org>, Kumar Gala <galak@...eaurora.org>,
	<linux-kernel@...r.kernel.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>
Subject: Re: [PATCH v4 2/2] [media] atmel-isc: DT binding for Image Sensor
 Controller driver

On Tue, 7 Jun 2016 15:11:53 +0800
Songjun Wu <songjun.wu@...el.com> wrote:

> DT binding documentation for ISC driver.
> 
> Signed-off-by: Songjun Wu <songjun.wu@...el.com>
> ---
> 
> Changes in v4:
> - Remove the isc clock nodes.
> 
> Changes in v3:
> - Remove the 'atmel,sensor-preferred'.
> - Modify the isc clock node according to the Rob's remarks.
> 
> Changes in v2:
> - Remove the unit address of the endpoint.
> - Add the unit address to the clock node.
> - Avoid using underscores in node names.
> - Drop the "0x" in the unit address of the i2c node.
> - Modify the description of 'atmel,sensor-preferred'.
> - Add the description for the ISC internal clock.
> 
>  .../devicetree/bindings/media/atmel-isc.txt        | 69 ++++++++++++++++++++++
>  1 file changed, 69 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/media/atmel-isc.txt
> 
> diff --git a/Documentation/devicetree/bindings/media/atmel-isc.txt b/Documentation/devicetree/bindings/media/atmel-isc.txt
> new file mode 100644
> index 0000000..3f83524
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/atmel-isc.txt
> @@ -0,0 +1,69 @@
> +Atmel Image Sensor Controller (ISC)
> +----------------------------------------------
> +
> +Required properties for ISC:
> +- compatible
> +	Must be "atmel,sama5d2-isc".
> +- reg
> +	Physical base address and length of the registers set for the device.
> +- interrupts
> +	Should contain IRQ line for the ISC.
> +- clocks
> +	List of clock specifiers, corresponding to entries in
> +	the clock-names property;
> +	Please refer to clock-bindings.txt.
> +- clock-names
> +	Required elements: "hclock".
> +- #clock-cells
> +	Should be 0.
> +- clock-output-names
> +	Should contain the name of the clock driving the sensor master clock.
> +- pinctrl-names, pinctrl-0
> +	Please refer to pinctrl-bindings.txt.
> +
> +
> +ISC 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:
> +isc: isc@...08000 {
> +	compatible = "atmel,sama5d2-isc";
> +	reg = <0xf0008000 0x4000>;
> +	interrupts = <46 IRQ_TYPE_LEVEL_HIGH 5>;
> +	clocks = <&isc_clk>, <&iscck>, <&isc_gclk>;
> +	clock-names = "hclock";

You have 3 clocks here and only one name. Are you sure this example is
actually working?

> +	#clock-cells = <0>;
> +	clock-output-names = "isc-mck";
> +
> +	port {
> +		#address-cells = <1>;
> +		#size-cells = <0>;
> +
> +		isc_0: endpoint {
> +			remote-endpoint = <&ov7740_0>;
> +			hsync-active = <1>;
> +			vsync-active = <0>;
> +			pclk-sample = <1>;
> +		};
> +	};
> +
> +
> +};
> +
> +i2c1: i2c@...28000 {
> +	ov7740: camera@21 {
> +	compatible = "ovti,ov7740";
> +	reg = <0x21>;
> +
> +	clocks = <&isc>;
> +	clock-names = "xvclk";
> +	assigned-clocks = <&isc>;
> +	assigned-clock-rates = <24000000>;
> +
> +	port {
> +		ov7740_0: endpoint {
> +			remote-endpoint = <&isc_0>;
> +		};
> +	};
> +};



-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com