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-rw-r--r--Documentation/powerpc/dts-bindings/gpio/led.txt46
1 files changed, 37 insertions, 9 deletions
diff --git a/Documentation/powerpc/dts-bindings/gpio/led.txt b/Documentation/powerpc/dts-bindings/gpio/led.txt
index ff51f4c0fa9..4fe14deedc0 100644
--- a/Documentation/powerpc/dts-bindings/gpio/led.txt
+++ b/Documentation/powerpc/dts-bindings/gpio/led.txt
@@ -1,15 +1,43 @@
-LED connected to GPIO
+LEDs connected to GPIO lines
Required properties:
-- compatible : should be "gpio-led".
-- label : (optional) the label for this LED. If omitted, the label is
+- compatible : should be "gpio-leds".
+
+Each LED is represented as a sub-node of the gpio-leds device. Each
+node's name represents the name of the corresponding LED.
+
+LED sub-node properties:
+- gpios : Should specify the LED's GPIO, see "Specifying GPIO information
+ for devices" in Documentation/powerpc/booting-without-of.txt. Active
+ low LEDs should be indicated using flags in the GPIO specifier.
+- label : (optional) The label for this LED. If omitted, the label is
taken from the node name (excluding the unit address).
-- gpios : should specify LED GPIO.
+- linux,default-trigger : (optional) This parameter, if present, is a
+ string defining the trigger assigned to the LED. Current triggers are:
+ "backlight" - LED will act as a back-light, controlled by the framebuffer
+ system
+ "default-on" - LED will turn on
+ "heartbeat" - LED "double" flashes at a load average based rate
+ "ide-disk" - LED indicates disk activity
+ "timer" - LED flashes at a fixed, configurable rate
-Example:
+Examples:
-led@0 {
- compatible = "gpio-led";
- label = "hdd";
- gpios = <&mcu_pio 0 1>;
+leds {
+ compatible = "gpio-leds";
+ hdd {
+ label = "IDE Activity";
+ gpios = <&mcu_pio 0 1>; /* Active low */
+ linux,default-trigger = "ide-disk";
+ };
};
+
+run-control {
+ compatible = "gpio-leds";
+ red {
+ gpios = <&mpc8572 6 0>;
+ };
+ green {
+ gpios = <&mpc8572 7 0>;
+ };
+}