linux-kernel - Re: [PATCH v4 1/2] [media] imx214: device tree binding

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Date:   Tue, 02 Oct 2018 23:06:57 +0300
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
Cc:     Hans Verkuil <hans.verkuil@...co.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
        jacopo@...ndi.org, phdm@...q.eu, devicetree@...r.kernel.org
Subject: Re: [PATCH v4 1/2] [media] imx214: device tree binding

Hi Ricardo,

Thank you for the patch.

On Tuesday, 2 October 2018 17:05:15 EEST Ricardo Ribalda Delgado wrote:
> Document bindings for imx214 camera sensor
> 
> Cc: devicetree@...r.kernel.org
> Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
> ---
> Changelog from v3:
> 
> Sakari Ailus:
> -s/should/shall/
> -remove clock-lanes
> 
> Philippe De Muyter:
> -s/imx274/imx214/
> 
> Laurent Pinchart:
> -s/to to/to/
> -Better description of lanes
> -clock-names: Shall be "xclk"
> -Drop clock-freq
> 
>  .../devicetree/bindings/media/i2c/imx214.txt  | 53 +++++++++++++++++++
>  1 file changed, 53 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/media/i2c/imx214.txt
> 
> diff --git a/Documentation/devicetree/bindings/media/i2c/imx214.txt
> b/Documentation/devicetree/bindings/media/i2c/imx214.txt new file mode
> 100644
> index 000000000000..421a019ab7f9
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/i2c/imx214.txt
> @@ -0,0 +1,53 @@
> +* Sony 1/3.06-Inch 13.13Mp CMOS Digital Image Sensor
> +
> +The Sony imx214 is a 1/3.06-inch CMOS active pixel digital image sensor
> with +an active array size of 4224H x 3200V. It is programmable through an
> I2C +interface. The I2C address can be configured to 0x1a or 0x10,
> depending on +how the hardware is wired.
> +Image data is sent through MIPI CSI-2, through 2 or 4 lanes at a maximum
> +throughput of 1.2Gbps/lane.
> +
> +
> +Required Properties:
> +- compatible: value should be "sony,imx214" for imx214 sensor
> +- reg: I2C bus address of the device
> +- enable-gpios: GPIO descriptor for the enable pin.
> +- vdddo-supply: Chip digital IO regulator (1.8V).
> +- vdda-supply: Chip analog regulator (2.7V).
> +- vddd-supply: Chip digital core regulator (1.12V).
> +- clocks: Reference to the xclk clock.
> +- clock-names:  Shall be "xclk".
> +
> +Optional Properties:
> +- flash-leds: See ../video-interfaces.txt
> +- lens-focus: See ../video-interfaces.txt
> +
> +The imx214 device node shall contain one 'port' child node with
> +an 'endpoint' subnode. For further reading on port node refer to
> +Documentation/devicetree/bindings/media/video-interfaces.txt.
> +
> +Required Properties on endpoint:
> +- data-lanes: check ../video-interfaces.txt

As I suppose you got access to the datasheet which doesn't appear to be 
public, I'll take this as an opportunity to fish for information :-) Does the 
sensor support remapping data lanes ? Could you please document that here ?

You should also state that only the 2 lanes and 4 lanes options are valid, and 
what lanes can be used in those cases. I assume that would be <1 2> and <1 2 3 
4>, but if other options are possible, it would be useful to document that.

With this updated,

Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

> +- link-frequencies: check ../video-interfaces.txt
> +- remote-endpoint: check ../video-interfaces.txt
> +
> +Example:
> +
> +	camera_rear@1a {
> +		compatible = "sony,imx214";
> +		reg = <0x1a>;
> +		vdddo-supply = <&pm8994_lvs1>;
> +		vddd-supply = <&camera_vddd_1v12>;
> +		vdda-supply = <&pm8994_l17>;
> +		lens-focus = <&ad5820>;
> +		enable-gpios = <&msmgpio 25 GPIO_ACTIVE_HIGH>;
> +		clocks = <&mmcc CAMSS_MCLK0_CLK>;
> +		clock-names = "xclk";
> +		port {
> +			imx214_ep: endpoint {
> +				data-lanes = <1 2 3 4>;
> +				link-frequencies = /bits/ 64 <480000000>;
> +				remote-endpoint = <&csiphy0_ep>;
> +			};
> +		};
> +	};


-- 
Regards,

Laurent Pinchart