From f9be4d5bb62ab41723db04d7b3abed2ad6c34825 Mon Sep 17 00:00:00 2001
From: Linus Walleij <linus.walleij@linaro.org>
Date: Tue, 26 Sep 2023 23:48:12 +0200
Subject: [PATCH] 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: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20230926-gpio-led-trigger-dt-v2-2-e06e458b788e@linaro.org
Signed-off-by: Lee Jones <lee@kernel.org>
---
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 5fb7007f36189..b42950643b9d6 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
--
GitLab