Re: [PATCH 1/2] dt-bindings: leds: add mps mp3326 LED

[Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxx>]

On 08/11/2023 04:29, Yuxi Wang wrote:
> Document mps mp3326 LED driver devicetree bindings.
> 
> Signed-off-by: Yuxi Wang <wyx137120466@xxxxxxxxx>
> ---
>  .../devicetree/bindings/leds/leds-mp3326.yaml | 184 ++++++++++++++++++
>  1 file changed, 184 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/leds/leds-mp3326.yaml

Except that this was not tested :(, few more comments.

Filename like compatible.

> 
> diff --git a/Documentation/devicetree/bindings/leds/leds-mp3326.yaml b/Documentation/devicetree/bindings/leds/leds-mp3326.yaml
> new file mode 100644
> index 000000000000..899cf568f647
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/leds/leds-mp3326.yaml
> @@ -0,0 +1,184 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/mps,mp3326.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: MPS MP3326 RGB/White LED Driver
> +
> +maintainers:
> +  - Yuxi Wang <wyx137120466@xxxxxxxxx>
> +
> +description: |
> +  The MP3326 is a RGB/White LED driver with I2C interface.
> +
> +  For more product information please see the link below:
> +  https://www.monolithicpower.com/en/products/mp3326.html
> +
> +properties:
> +  compatible:
> +    - const: mps,mp3326
> +
> +  "#address-cells":
> +    const: 1
> +
> +  "#size-cells":
> +    const: 0
> +
> +  reg:
> +    maxItems: 1
> +
> +  mps,led-protect:
> +    description: |
> +      LED short protection threshold.

threshold? So in some units? What does it mean? What do the values mean?

> +    enum: [0, 1, 2, 3]
> +
> +  multi-led:
> +    type: object
> +
> +    properties:
> +      "#address-cells":
> +        const: 1
> +      "#size-cells":
> +        const: 0
> +
> +      color:
> +        description: RGB module
> +        const: LED_COLOR_ID_RGB
> +
> +      led_r:

Nope. First, no underscores in names. Second, please open existing
bindings and look how it is done there.

> +        type: object
> +
> +        properties:
> +          "#address-cells":
> +            const: 1
> +          "#size-cells":
> +            const: 0

Why do you have the,?

> +          reg:
> +            description: Index of the LED.
> +            minimum: 1
> +            maximum: 16

Please format it properly. You miss blank lines between each property
description.

> +          color:
> +            description: Red.
> +            const: LED_COLOR_ID_RED
> +          required:
> +            - reg
> +            - color
> +
> +      led_g:
> +        type: object
> +
> +        properties:
> +          "#address-cells":
> +            const: 1
> +          "#size-cells":
> +            const: 0
> +        reg:
> +          description: Index of the LED.
> +          minimum: 1
> +          maximum: 16
> +        color:
> +          description: Green.
> +          const: LED_COLOR_ID_GREEN
> +        required:
> +          - reg
> +          - color
> +
> +      led_b:
> +        type: object
> +
> +        properties:
> +          "#address-cells":
> +            const: 1
> +          "#size-cells":
> +            const: 0
> +        reg:
> +          description: Index of the LED.
> +          minimum: 1
> +          maximum: 16
> +        color:
> +          description: Blue.
> +          const: LED_COLOR_ID_BLUE
> +        required:
> +          - reg
> +          - color
> +
> +  patternProperties:
> +    "^led@[0-3]$":
> +      type: object
> +
> +      properties:
> +        reg:
> +          description: Index of the LED.
> +          minimum: 1
> +          maximum: 16
> +
> +        required:
> +          - reg
> +          - color

Missing required, additionalProperties.

Open existing binding and use it as example.

> +
> +examples:
> +  - |
> +    #include <dt-bindings/leds/common.h>
> +
> +    i2c {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        mp3326@30 {

Node names should be generic. See also an explanation and list of
examples (not exhaustive) in DT specification:
https://devicetree-specification.readthedocs.io/en/latest/chapter2-devicetree-basics.html#generic-names-recommendation


> +            compatible = "mps,mp3326";
> +            reg = <0x30>;
> +            led-protect =<3>;
> +            #address-cells = <1>;
> +            #size-cells = <0>;
> +
> +            multi-led {
> +              color = <LED_COLOR_ID_RGB>;
> +              #address-cells = <1>;
> +              #size-cells = <0>;
> +
> +              rgb_r@1 {
> +                  #address-cells = <1>;
> +                  #size-cells = <0>;
> +                  reg  = <1>;
> +                  color = <LED_COLOR_ID_RED>;
> +              };
> +              rgb_g@2 {
> +                  #address-cells = <1>;
> +                  #size-cells = <0>;
> +                  reg = <2>;
> +                  color = <LED_COLOR_ID_GREEN>;
> +              };
> +              rgb_b@3 {
> +                  #address-cells = <1>;
> +                  #size-cells = <0>;
> +                  reg = <3>;
> +                  color = <LED_COLOR_ID_BLUE>;
> +              };
> +            };
> +        };
> +    };
> +
> +  - |
> +    #include <dt-bindings/leds/common.h>
> +
> +    i2c {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        mp3326@30 {

Node names should be generic. See also an explanation and list of
examples (not exhaustive) in DT specification:
https://devicetree-specification.readthedocs.io/en/latest/chapter2-devicetree-basics.html#generic-names-recommendation


> +            compatible = "mps,mp3326";
> +            reg = <0x30>;
> +            led-protect =<3>;
> +            #address-cells = <1>;
> +            #size-cells = <0>;
> +            led0@0 {
> +                #address-cells = <1>;
> +                #size-cells = <0>;
> +                reg= <5>;
> +                color = <LED_COLOR_ID_WHITE>;
> +            };
> +        };
> +    };
> +
> +...

Best regards,
Krzysztof