Re: [PATCH v2 1/2] media: dt-bindings: alvium: add document YAML binding

[Conor Dooley <conor@kernel.org>]

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Hey Tommaso,

On Fri, May 26, 2023 at 07:39:43PM +0200, Tommaso Merciai wrote:
> Add documentation of device tree in YAML schema for the ALVIUM
> Camera from Allied Vision Inc.
> 
> References:
>  - https://www.alliedvision.com/en/products/embedded-vision-solutions
> 
> Signed-off-by: Tommaso Merciai <tomm.merciai@gmail.com>
> ---
> Changes since v1:
>  - Fixed build error as suggested by RHerring bot
> 
>  .../media/i2c/alliedvision,alvium.yaml        | 115 ++++++++++++++++++
>  1 file changed, 115 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/media/i2c/alliedvision,alvium.yaml
> 
> diff --git a/Documentation/devicetree/bindings/media/i2c/alliedvision,alvium.yaml b/Documentation/devicetree/bindings/media/i2c/alliedvision,alvium.yaml
> new file mode 100644
> index 000000000000..81e9e560c99d
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/i2c/alliedvision,alvium.yaml
> @@ -0,0 +1,115 @@
> +# SPDX-License-Identifier: GPL-2.0

No dual license?

> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/media/i2c/alliedvision,alvium.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Alliedvision Alvium Camera
> +
> +maintainers:
> +  - Tommaso Merciai <tomm.merciai@gmail.com>
> +  - Martin Hecht <martin.hecht@avnet.eu>
> +
> +allOf:
> +  - $ref: /schemas/media/video-interface-devices.yaml#
> +
> +properties:
> +  compatible:
> +    const: alliedvision,alvium
> +
> +  reg:
> +    maxItems: 1
> +
> +  clocks:
> +    description: XCLK Input Clock

Description is a bit moot when you have the clock name and there's only
one. No harm done I suppose.

> +
> +  clock-names:
> +    const: xclk
> +
> +  powerdown-gpios:
> +    maxItems: 1
> +    description: >

You don't have any newlines, so you don't need a >

> +      Reference to the GPIO connected to the powerdown pin, if any.
> +
> +  reset-gpios:
> +    maxItems: 1
> +    description: >
> +      Reference to the GPIO connected to the reset pin, if any.
> +
> +  streamon-delay:
> +    maxItems: 1
> +    description: >
> +      Delay before camera start capturing frames in us.
> +
> +  rotation:
> +    enum:
> +      - 0
> +      - 180

Could style this as enum: [0, 180], but I don't mind which you do.

> +  port:
> +    description: Digital Output Port
> +    $ref: /schemas/graph.yaml#/$defs/port-base
> +    additionalProperties: false
> +
> +    properties:
> +      endpoint:
> +        $ref: /schemas/media/video-interfaces.yaml#
> +        unevaluatedProperties: false
> +
> +        properties:
> +          clock-lanes:
> +            const: 0
> +          data-lanes:
> +            minItems: 1
> +            maxItems: 4
> +          link-frequencies: true
> +
> +        required:
> +          - data-lanes
> +          - link-frequencies
> +
> +required:
> +  - compatible
> +  - reg
> +  - clocks
> +  - clock-names
> +  - port
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +      #include <dt-bindings/gpio/gpio.h>
> +      #include <dt-bindings/clock/imx8mp-clock.h>
> +
> +      i2c {
> +          #address-cells = <1>;
> +          #size-cells = <0>;
> +
> +          camera: alvium@3c {

Label does not seem to be used & the generic node name should probably
be "camera", no?

> +              compatible = "alliedvision,alvium";
> +              pinctrl-names = "default";
> +              pinctrl-0 = <&pinctrl_csi0_pwn>, <&pinctrl_csi0_rst>, <&pinctrl_csi_mclk>;
> +              reg = <0x3c>;
> +              clocks = <&clk IMX8MP_CLK_IPP_DO_CLKO2>;
> +              clock-names = "xclk";
> +              assigned-clocks = <&clk IMX8MP_CLK_IPP_DO_CLKO2>;
> +              assigned-clock-parents = <&clk IMX8MP_CLK_24M>;
> +              assigned-clock-rates = <24000000>;
> +              streamon-delay = <20>;
> +              powerdown-gpios = <&gpio2 11 GPIO_ACTIVE_HIGH>;
> +              reset-gpios = <&gpio1 6 GPIO_ACTIVE_LOW>;
> +              status = "okay";
> +
> +              port {
> +                  alvium_out: endpoint {

Ditto here, drop the unused label?

Otherwise, looks grand to me.

Cheers,
Conor.

> +                      remote-endpoint = <&mipi_csi_0_in>;
> +                      data-lanes = <1 2 3 4>;
> +                      link-frequencies = /bits/ 64 <681250000>;
> +                      clock-lanes = <0>;
> +                  };
> +              };
> +          };
> +      };
> +
> +...
> -- 
> 2.34.1
> 

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