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

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Date:   Wed, 24 Aug 2022 14:47:18 +0200
From:   Jean-Jacques Hiblot <jjhiblot@...phandler.com>
To:     Sascha Hauer <sha@...gutronix.de>
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 24/08/2022 14:21, Sascha Hauer wrote:
> 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>;
ok.
>
>> +    };
>> +
>> +    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?

Good point. I'll add this to the example. Thanks.

JJ

>
> Sascha
>