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SubjectRe: [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@linaro.org>
> Reviewed-by: Rob Herring <robh@kernel.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

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