Re: [PATCH v6 2/3] dt-bindings: leds: Add multicolor PWM LED bindings

[Rob Herring <robh@kernel.org>]

On Tue, Feb 08, 2022 at 08:12:35PM +0100, sven@svenschwermer.de wrote:
> From: Sven Schwermer <sven.schwermer@disruptive-technologies.com>
> 
> This allows to group multiple PWM-connected monochrome LEDs into
> multicolor LEDs, e.g. RGB LEDs.
> 
> Signed-off-by: Sven Schwermer <sven.schwermer@disruptive-technologies.com>
> ---
> 
> Notes:
>     Changes in v6:
>     * Fix device tree binding schema
>     
>     Changes in v5:
>     * (no changes)
>     
>     Changes in v4:
>     * (no changes)
>     
>     Changes in v3:
>     * Remove multi-led unit name
> 
>  .../bindings/leds/leds-pwm-multicolor.yaml    | 69 +++++++++++++++++++
>  1 file changed, 69 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/leds/leds-pwm-multicolor.yaml
> 
> diff --git a/Documentation/devicetree/bindings/leds/leds-pwm-multicolor.yaml b/Documentation/devicetree/bindings/leds/leds-pwm-multicolor.yaml
> new file mode 100644
> index 000000000000..f7ce29c8ae63
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/leds/leds-pwm-multicolor.yaml
> @@ -0,0 +1,69 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/leds/leds-pwm-multicolor.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Multi-color LEDs connected to PWM
> +
> +maintainers:
> +  - Sven Schwermer <sven.schwermer@disruptive-technologies.com>
> +
> +description: |
> +  This driver combines several monochrome PWM LEDs into one multi-color
> +  LED using the multicolor LED class.
> +
> +properties:
> +  compatible:
> +    const: pwm-leds-multicolor

blank line

> +  multi-led:
> +    type: object

blank line

> +    patternProperties:
> +      "^led-[0-9a-z]+$":
> +        type: object
> +        $ref: common.yaml#

blank line

> +        properties:
> +          pwms:
> +            maxItems: 1

blank line and so on. (There not a hard rule, but roughly it's 
blank lines between DT property sub-schemas, top-level keywords, and 
properties/patternProperties/required.)

> +          pwm-names: true
> +          color: true
> +        required:
> +          - pwms
> +          - color

> +        additionalProperties: false

While the top level goes at the end, I find it is easier to read putting 
the indented cases before properties/patternProperties. 

> +required:
> +  - compatible
> +allOf:
> +  - $ref: leds-class-multicolor.yaml#
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/leds/common.h>
> +
> +    rgb-led {
> +        compatible = "pwm-leds-multicolor";
> +
> +        multi-led {
> +          color = <LED_COLOR_ID_RGB>;
> +          function = LED_FUNCTION_INDICATOR;
> +          max-brightness = <65535>;
> +
> +          led-red {
> +              pwms = <&pwm1 0 1000000>;
> +              color = <LED_COLOR_ID_RED>;
> +          };
> +
> +          led-green {
> +              pwms = <&pwm2 0 1000000>;
> +              color = <LED_COLOR_ID_GREEN>;
> +          };
> +
> +          led-blue {
> +              pwms = <&pwm3 0 1000000>;
> +              color = <LED_COLOR_ID_BLUE>;
> +          };
> +        };
> +    };
> +
> +...
> -- 
> 2.35.1
> 
>