linux-kernel - Re: [PATCH v2 1/3] dt-bindings: media: i2c: Add IMX290 CMOS sensor binding

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Message-ID: <20190813094526.GG835@valkosipuli.retiisi.org.uk>
Date:   Tue, 13 Aug 2019 12:45:26 +0300
From:   Sakari Ailus <sakari.ailus@....fi>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc:     mchehab@...nel.org, robh+dt@...nel.org,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        c.barrett@...mos.com, a.brela@...mos.com
Subject: Re: [PATCH v2 1/3] dt-bindings: media: i2c: Add IMX290 CMOS sensor
 binding

Hi Manivannan,

On Tue, Aug 06, 2019 at 06:39:36PM +0530, Manivannan Sadhasivam wrote:
> Add devicetree binding for IMX290 CMOS image sensor.
> 
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> Reviewed-by: Rob Herring <robh@...nel.org>
> ---
>  .../devicetree/bindings/media/i2c/imx290.txt  | 51 +++++++++++++++++++
>  1 file changed, 51 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/media/i2c/imx290.txt
> 
> diff --git a/Documentation/devicetree/bindings/media/i2c/imx290.txt b/Documentation/devicetree/bindings/media/i2c/imx290.txt
> new file mode 100644
> index 000000000000..7535b5b5b24b
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/i2c/imx290.txt
> @@ -0,0 +1,51 @@
> +* Sony IMX290 1/2.8-Inch CMOS Image Sensor
> +
> +The Sony IMX290 is a 1/2.8-Inch CMOS Solid-state image sensor with
> +Square Pixel for Color Cameras. It is programmable through I2C and 4-wire
> +interfaces. The sensor output is available via CMOS logic parallel SDR output,
> +Low voltage LVDS DDR output and CSI-2 serial data output.

If there are three to choose from, then you should specify which one is in
use. Given that I think chances remain slim we'd add support for the other
two (it's certainly not ruled out though), CSI-2 could be the default. But
this needs to be documented.

> +
> +Required Properties:
> +- compatible: Should be "sony,imx290"
> +- reg: I2C bus address of the device
> +- clocks: Reference to the xclk clock.
> +- clock-names: Should be "xclk".
> +- clock-frequency: Frequency of the xclk clock.

...in Hz.

> +- vdddo-supply: Sensor digital IO regulator.
> +- vdda-supply: Sensor analog regulator.
> +- vddd-supply: Sensor digital core regulator.
> +
> +Optional Properties:
> +- reset-gpios: Sensor reset GPIO
> +
> +The imx290 device node should contain one 'port' child node with
> +an 'endpoint' subnode. For further reading on port node refer to
> +Documentation/devicetree/bindings/media/video-interfaces.txt.

Which other properties are relevant for the device? I suppose you can't
change the lane order, so clock-lanes is redundant (don't use it in the
example) and data-lanes should be monotonically incrementing series from 1
to 4.

> +
> +Example:
> +	&i2c1 {
> +		...
> +		imx290: imx290@1a {

imx290: camera-sensor@1a {

> +			compatible = "sony,imx290";
> +			reg = <0x1a>;
> +
> +			reset-gpios = <&msmgpio 35 GPIO_ACTIVE_LOW>;
> +			pinctrl-names = "default";
> +			pinctrl-0 = <&camera_rear_default>;
> +
> +			clocks = <&gcc GCC_CAMSS_MCLK0_CLK>;
> +			clock-names = "xclk";
> +			clock-frequency = <37125000>;
> +
> +			vdddo-supply = <&camera_vdddo_1v8>;
> +			vdda-supply = <&camera_vdda_2v8>;
> +			vddd-supply = <&camera_vddd_1v5>;
> +
> +			port {
> +				imx290_ep: endpoint {
> +					clock-lanes = <1>;
> +					data-lanes = <0 2 3 4>;
> +					remote-endpoint = <&csiphy0_ep>;
> +				};
> +			};
> +		};

-- 
Regards,

Sakari Ailus