Commit f9be4d5b authored by Linus Walleij's avatar Linus Walleij Committed by Lee Jones
Browse files

dt-bindings: leds: Mention GPIO triggers 



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: default avatarLinus Walleij <linus.walleij@linaro.org>
Acked-by: default avatarConor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20230926-gpio-led-trigger-dt-v2-2-e06e458b788e@linaro.org


Signed-off-by: default avatarLee Jones <lee@kernel.org>
parent 8d3fd7ed

Documentation/devicetree/bindings/leds/common.yaml

+2 −0
Original line number Diff line number Diff line
@@ -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