doc/device-tree-bindings/leds/common.txt

   1 Common leds properties.
   2
   3 Optional properties for child nodes:
   4 - label : The label for this LED.  If omitted, the label is
   5   taken from the node name (excluding the unit address).
   6
   7 - linux,default-trigger :  This parameter, if present, is a
   8     string defining the trigger assigned to the LED.  Current triggers are:
   9      "backlight" - LED will act as a back-light, controlled by the framebuffer
  10                    system
  11      "default-on" - LED will turn on (but for leds-gpio see "default-state"
  12                     property in Documentation/devicetree/bindings/gpio/led.txt)
  13      "heartbeat" - LED "double" flashes at a load average based rate
  14      "ide-disk" - LED indicates disk activity
  15      "timer" - LED flashes at a fixed, configurable rate
  16
  17 Examples:
  18
  19 system-status {
  20         label = "Status";
  21         linux,default-trigger = "heartbeat";
  22         ...
  23 };