Re: [PATCH 1/2] dt-bindings: leds: Mention GPIO triggers

[Conor Dooley]

On Tue, Sep 12, 2023 at 03:44:30PM +0200, Linus Walleij wrote:
> We reuse the trigger-sources phandle to just point to
> GPIOs we may want to use as LED triggers.
> 
> Example:
> 
> gpio: gpio@0 {
>     compatible "my-gpio";
>     gpio-controller;
>     #gpio-cells = <2>;
>     interrupt-controller;
>     #interrupt-cells = <2>;
>     #trigger-source-cells = <2>;
> };
> 
> leds {
>     compatible = "gpio-leds";
>     led-my-gpio {
>         label = "device:blue:myled";
>         gpios = <&gpio 0 GPIO_ACTIVE_HIGH>;
>         default-state = "off";
>         linux,default-trigger = "gpio";
>         trigger-sources = <&gpio 1 GPIO_ACTIVE_HIGH>;
>     };
> };
> 
> Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
> ---
>  Documentation/devicetree/bindings/leds/common.yaml | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/leds/common.yaml b/Documentation/devicetree/bindings/leds/common.yaml
> index 5fb7007f3618..b42950643b9d 100644
> --- a/Documentation/devicetree/bindings/leds/common.yaml
> +++ b/Documentation/devicetree/bindings/leds/common.yaml
> @@ -191,6 +191,8 @@ properties:
>        each of them having its own LED assigned (assuming they are not
>        hardwired). In such cases this property should contain phandle(s) of
>        related source device(s).
> +      Another example is a GPIO line that will be monitored and mirror the
> +      state of the line (with or without inversion flags) to the LED.
>        In many cases LED can be related to more than one device (e.g. one USB LED
>        vs. multiple USB ports). Each source should be represented by a node in
>        the device tree and be referenced by a phandle and a set of phandle
> 

Acked-by: Conor Dooley <conor.dooley@xxxxxxxxxxxxx>

Thanks,
Conor.

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