linux-kernel - Re: RFC: dt-binding: media: document ON Semi AR0521 sensor bindings

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Date:   Tue, 16 Mar 2021 21:04:36 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Krzysztof Hałasa <khalasa@...p.pl>
Cc:     devicetree@...r.kernel.org,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: RFC: dt-binding: media: document ON Semi AR0521 sensor bindings

Hi Krzysztof,

Thank you for the patch.

On Tue, Mar 16, 2021 at 02:25:01PM +0100, Krzysztof Hałasa wrote:
> This file documents DT bindings for the AR0521 camera sensor driver.
> 
> Signed-off-by: Krzysztof Halasa <khalasa@...p.pl>
> 
> diff --git a/Documentation/devicetree/bindings/media/i2c/onnn,ar0521.yaml b/Documentation/devicetree/bindings/media/i2c/onnn,ar0521.yaml
> new file mode 100644
> index 000000000000..f649d4cbcb37
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/i2c/onnn,ar0521.yaml
> @@ -0,0 +1,76 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/media/i2c/onnn,ar0521.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: ON Semiconductor AR0521 MIPI CSI-2 sensor
> +
> +maintainers:
> +  - Krzysztof Halasa <khalasa@...p.pl>
> +
> +description: |-
> +  The AR0521 is a raw CMOS image sensor with MIPI CSI-2 and
> +  I2C-compatible control interface.
> +
> +properties:
> +  compatible:
> +    const: on-semi,ar0521

That's not the correct prefix for ON Semiconductor. See
Documentation/devicetree/bindings/vendor-prefixes.yaml. Or just the name
of this file :-)

> +
> +  reg:
> +    description: I2C bus address of the sensor device

You can drop this, it's implicit for I2C devices.

> +    maxItems: 1
> +
> +  clocks:
> +    description: reference to the xclk clock
> +    maxItems: 1
> +
> +  clock-names:
> +    const: xclk
> +
> +  reset-gpios:
> +    description: active low reset GPIO
> +    maxItems: 1
> +
> +  port:
> +    type: object
> +    description: |
> +      Output video port: 1, 2 or 4 lanes. See ../video-interfaces.txt.

You can use the OF graph and video interfaces schema, see commit
066a94e28a23 in mainline.

> +
> +required:
> +  - compatible
> +  - reg
> +  - clocks
> +  - clock-names
> +  - port
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/gpio/gpio.h>
> +    #include <dt-bindings/clock/imx6qdl-clock.h>
> +
> +    i2c {
> +            #address-cells = <1>;
> +            #size-cells = <0>;
> +
> +            ar0521: camera-sensor@36 {
> +                    compatible = "onnn,ar0521";
> +                    reg = <0x36>;
> +                    pinctrl-names = "default";
> +                    pinctrl-0 = <&pinctrl_mipi_camera>;
> +
> +                    clocks = <&clks IMX6QDL_CLK_CKO>;
> +                    clock-names = "xclk";
> +
> +                    reset-gpios = <&gpio1 7 GPIO_ACTIVE_LOW>;
> +
> +                    port {
> +                           mipi_camera_to_mipi_csi2: endpoint {
> +                                    remote-endpoint = <&mipi_csi2_in>;
> +                                    data-lanes = <1 2 3 4>;
> +                            };
> +                    };
> +            };
> +    };

-- 
Regards,

Laurent Pinchart