linux-kernel - Re: [PATCH v3 2/3] dt-bindings: leds: Shiji Lighting APA102C LED

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Date:   Fri, 6 Mar 2020 21:19:57 +0100
From:   Jacek Anaszewski <jacek.anaszewski@...il.com>
To:     Nicolas Belin <nbelin@...libre.com>, linux-kernel@...r.kernel.org,
        linux-leds@...r.kernel.org, pavel@....cz, dmurphy@...com,
        devicetree@...r.kernel.org
Cc:     baylibre-upstreaming@...ups.io
Subject: Re: [PATCH v3 2/3] dt-bindings: leds: Shiji Lighting APA102C LED

Hi Nicolas,

On 3/6/20 2:40 PM, Nicolas Belin wrote:
> Document Shiji Lighting APA102C LED driver device tree bindings.
> 
> Signed-off-by: Nicolas Belin <nbelin@...libre.com>
> ---
>  .../devicetree/bindings/leds/leds-apa102c.yaml     | 97 ++++++++++++++++++++++
>  1 file changed, 97 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/leds/leds-apa102c.yaml
> 
> diff --git a/Documentation/devicetree/bindings/leds/leds-apa102c.yaml b/Documentation/devicetree/bindings/leds/leds-apa102c.yaml
> new file mode 100644
> index 000000000000..21457fc3762d
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/leds/leds-apa102c.yaml
> @@ -0,0 +1,97 @@
> +# SPDX-License-Identifier: GPL-2.0
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/leds/leds-apa102c.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: LED driver for Shiji Lighting - APA102C
> +
> +maintainers:
> +  - Nicolas Belin <nbelin@...libre.com>
> +
> +description:
> +  Each RGB LED is represented as a rgb-led sub-node of the leds-apa102c
> +  device.  Each LED is a three color rgb LED with an additional 32 levels
> +  brightness adjustment. They can be cascaded so that multiple LEDs can be set
> +  with a single command.
> +
> +properties:
> +  compatible:
> +    const: shiji,apa102c
> +
> +  reg:
> +    maxItems: 1
> +
> +  spi-max-frequency:
> +    maximum: 1000000
> +
> +  "#address-cells":
> +    const: 1
> +
> +  "#size-cells":
> +    const: 0
> +
> +patternProperties:
> +  "^rgb-led@[0-9]+$":
> +    type: object
> +    description: |
> +      Array of connected RGB LEDs.
> +
> +    properties:
> +      reg:
> +        description: |
> +          This property corresponds to the led index. It has to be between 0
> +          and the number of managed leds minus 1
> +        maxItems: 1
> +
> +      label:

As mentioned before - don't use label and use function
and color properties instead.

> +        description: |
> +          This property corresponds to the name of the RGB led.
> +        maxItems: 1
> +
> +      linux,default-trigger: true
> +
> +      "#address-cells":
> +        const: 1
> +
> +      "#size-cells":
> +        const: 0
> +
> +    required:
> +      - reg
> +      - label
> +      - '#address-cells'
> +      - '#size-cells'
> +
> +required:
> +  - compatible
> +  - reg
> +  - spi-max-frequency
> +  - '#address-cells'
> +  - '#size-cells'
> +
> +examples:
> +  - |
> +    spi {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +        led-controller@0 {
> +            compatible = "shiji,apa102c";
> +            reg = <0>;
> +            spi-max-frequency = <1000000>;
> +            #address-cells = <1>;
> +            #size-cells = <0>;
> +            rgb-led@0 {

s/rgb-led/led/

> +                #address-cells = <1>;
> +                #size-cells = <0>;
> +                reg = <0>;
> +                label = "rgb_led1";

Instead of label please use function and color properties.

E.g.

color = LED_COLOR_ID_RED;
function = LED_FUNCTION_STATUS;

If the function of your interest is not available in
include/dt-bindings/leds/common.h then you can propose one.

Please refer to Documentation/devicetree/bindings/leds/common.txt.


> +            };
> +            rgb-led@1 {

s/rgb-led/led/

> +                #address-cells = <1>;
> +                #size-cells = <0>;
> +                reg = <1>;
> +                label = "rgb_led2";
> +            };

You have to apply DT scheme from LED common bindings and have
separate child node for each color of RGB LED.

> +        };
> +    };
> 

-- 
Best regards,
Jacek Anaszewski