LXR linux/Documentation/devicetree/bindings/leds/leds-pwm.txt

   1LED connected to PWM
   2
   3Required properties:
   4- compatible : should be "pwm-leds".
   5
   6Each LED is represented as a sub-node of the pwm-leds device.  Each
   7node's name represents the name of the corresponding LED.
   8
   9LED sub-node properties:
  10- pwms : PWM property to point to the PWM device (phandle)/port (id) and to
  11  specify the period time to be used: <&phandle id period_ns>;
  12- pwm-names : (optional) Name to be used by the PWM subsystem for the PWM device
  13  For the pwms and pwm-names property please refer to:
  14  Documentation/devicetree/bindings/pwm/pwm.txt
  15- max-brightness : Maximum brightness possible for the LED
  16- label :  (optional)
  17  see Documentation/devicetree/bindings/leds/common.txt
  18- linux,default-trigger :  (optional)
  19  see Documentation/devicetree/bindings/leds/common.txt
  20
  21Example:
  22
  23twl_pwm: pwm {
  24        /* provides two PWMs (id 0, 1 for PWM1 and PWM2) */
  25        compatible = "ti,twl6030-pwm";
  26        #pwm-cells = <2>;
  27};
  28
  29twl_pwmled: pwmled {
  30        /* provides one PWM (id 0 for Charing indicator LED) */
  31        compatible = "ti,twl6030-pwmled";
  32        #pwm-cells = <2>;
  33};
  34
  35pwmleds {
  36        compatible = "pwm-leds";
  37        kpad {
  38                label = "omap4::keypad";
  39                pwms = <&twl_pwm 0 7812500>;
  40                max-brightness = <127>;
  41        };
  42
  43        charging {
  44                label = "omap4:green:chrg";
  45                pwms = <&twl_pwmled 0 7812500>;
  46                max-brightness = <255>;
  47        };
  48};
  49