linux-kernel - Re: [PATCH v3 3/4] dt-bindings: leds: Add binding for a multicolor group of LEDs

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Message-ID: <20220824122156.GQ17485@pengutronix.de>
Date:   Wed, 24 Aug 2022 14:21:56 +0200
From:   Sascha Hauer <sha@...gutronix.de>
To:     Jean-Jacques Hiblot <jjhiblot@...phandler.com>
Cc:     pavel@....cz, robh+dt@...nel.org,
        sven.schwermer@...ruptive-technologies.com,
        krzysztof.kozlowski+dt@...aro.org, johan+linaro@...nel.org,
        marijn.suijten@...ainline.org, bjorn.andersson@...aro.org,
        andy.shevchenko@...il.com, linux-leds@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Rob Herring <robh@...nel.org>
Subject: Re: [PATCH v3 3/4] dt-bindings: leds: Add binding for a multicolor
 group of LEDs

On Wed, Aug 24, 2022 at 12:30:31PM +0200, Jean-Jacques Hiblot wrote:
> This allows to group multiple monochromatic LEDs into a multicolor
> LED, e.g. RGB LEDs.
> 
> Signed-off-by: Jean-Jacques Hiblot <jjhiblot@...phandler.com>
> Reviewed-by: Rob Herring <robh@...nel.org>
> ---
>  .../bindings/leds/leds-group-multicolor.yaml  | 61 +++++++++++++++++++
>  1 file changed, 61 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/leds/leds-group-multicolor.yaml
> 
> diff --git a/Documentation/devicetree/bindings/leds/leds-group-multicolor.yaml b/Documentation/devicetree/bindings/leds/leds-group-multicolor.yaml
> new file mode 100644
> index 000000000000..79e5882a08e2
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/leds/leds-group-multicolor.yaml
> @@ -0,0 +1,61 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/leds/leds-group-multicolor.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Multi-color LED built with monochromatic LEDs
> +
> +maintainers:
> +  - Jean-Jacques Hiblot <jjhiblot@...phandler.com>
> +
> +description: |
> +  This driver combines several monochromatic LEDs into one multi-color
> +  LED using the multicolor LED class.
> +
> +properties:
> +  compatible:
> +    const: leds-group-multicolor
> +
> +  leds:
> +    description:
> +      An aray of monochromatic leds
> +    $ref: /schemas/types.yaml#/definitions/phandle-array
> +
> +required:
> +  - leds
> +
> +allOf:
> +  - $ref: leds-class-multicolor.yaml#
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/gpio/gpio.h>
> +    #include <dt-bindings/leds/common.h>
> +
> +    monochromatic-leds {
> +        compatible = "gpio-leds";
> +
> +        led0: led-0 {
> +            gpios = <&mcu_pio 0 GPIO_ACTIVE_LOW>;
> +        };
> +
> +        led1: led-1 {
> +            gpios = <&mcu_pio 1 GPIO_ACTIVE_HIGH>;
> +        };
> +
> +        led2: led-2 {
> +            gpios = <&mcu_pio 1 GPIO_ACTIVE_HIGH>;
> +        };

led-2 has the same GPIO as led-1, should likely be <&mcu_pio 2 GPIO_ACTIVE_HIGH>;

> +    };
> +
> +    multi-led {
> +        compatible = "leds-group-multicolor";
> +        color = <LED_COLOR_ID_RGB>;
> +        function = LED_FUNCTION_INDICATOR;
> +        leds = <&led0>, <&led1>, <&led2>;
> +    };

When reading this I wondered how the driver knows which LED has which
color. Should you assign colors to the individual LEDs to make that
clear in the example?

Sascha

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