linux-kernel - Re: [PATCH 1/2] dt-bindings: media: i2c: Add mt9t111 image sensor

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Date:   Mon, 7 May 2018 12:17:54 +0300
From:   Sakari Ailus <sakari.ailus@....fi>
To:     Jacopo Mondi <jacopo+renesas@...ndi.org>
Cc:     hans.verkuil@...co.com, mchehab@...nel.org, robh+dt@...nel.org,
        linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: media: i2c: Add mt9t111 image sensor

Hi Jacopo,

On Wed, Apr 25, 2018 at 01:00:13PM +0200, Jacopo Mondi wrote:
> Add device tree bindings documentation for Micron MT9T111/MT9T112 image
> sensors.
> 
> Signed-off-by: Jacopo Mondi <jacopo+renesas@...ndi.org>
> ---
>  Documentation/devicetree/bindings/mt9t112.txt | 41 +++++++++++++++++++++++++++
>  1 file changed, 41 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/mt9t112.txt
> 
> diff --git a/Documentation/devicetree/bindings/mt9t112.txt b/Documentation/devicetree/bindings/mt9t112.txt
> new file mode 100644
> index 0000000..cbad475
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mt9t112.txt
> @@ -0,0 +1,41 @@
> +Micron 3.1Mp CMOS Digital Image Sensor
> +--------------------------------------
> +
> +The Micron MT9T111 and MT9T112 are 1/4 inch 3.1Mp System-On-A-Chip (SOC) CMOS
> +digital image sensors which support up to QXGA (2048x1536) image resolution in
> +4/3 format.
> +
> +The sensors can be programmed through a two-wire serial interface and can
> +work both in parallel data output mode as well as in MIPI CSI-2 mode.
> +
> +Required Properties:
> +- compatible: shall be one of the following values
> +  	"micron,mt9t111" for MT9T111 sensors
> +	"micron,mt9t112" for MT9T112 sensors
> +
> +Optional properties:
> +- powerdown-gpios: reference to powerdown input GPIO signal. Pin name "STANDBY".
> +  Active level is high.
> +
> +The device node shall contain one 'port' sub-node with one 'endpoint' child
> +node, modeled accordingly to bindings described in:
> +Documentation/devicetree/bindings/media/video-interfaces.txt
> +
> +Example:
> +--------
> +
> +	mt9t112@3d {
> +		compatible = "micron,mt9t112";
> +		reg = <0x3d>;
> +
> +		powerdown-gpios = <&gpio4 2 GPIO_ACTIVE_HIGH>;
> +
> +		port {
> +			mt9t112_out: endpoint {
> +				pclk-sample = <1>;

Could you document pclk-sample as an endpoint property? I'd suggest making
it optional with a default configuration.

> +				remote-endpoint = <&ceu_in>;
> +			};
> +		};
> +	};
> +
> +

-- 
Sakari Ailus
e-mail: sakari.ailus@....fi