Documentation/devicetree/bindings/video/backlight/pwm-backlight.txt

   1 pwm-backlight bindings
   2
   3 Required properties:
   4   - compatible: "pwm-backlight"
   5   - pwms: OF device-tree PWM specification (see PWM binding[0])
   6   - brightness-levels: Array of distinct brightness levels. Typically these
   7       are in the range from 0 to 255, but any range starting at 0 will do.
   8       The actual brightness level (PWM duty cycle) will be interpolated
   9       from these values. 0 means a 0% duty cycle (darkest/off), while the
  10       last value in the array represents a 100% duty cycle (brightest).
  11   - default-brightness-level: the default brightness level (index into the
  12       array defined by the "brightness-levels" property)
  13
  14 Optional properties:
  15   - pwm-names: a list of names for the PWM devices specified in the
  16                "pwms" property (see PWM binding[0])
  17
  18 [0]: Documentation/devicetree/bindings/pwm/pwm.txt
  19
  20 Example:
  21
  22         backlight {
  23                 compatible = "pwm-backlight";
  24                 pwms = <&pwm 0 5000000>;
  25
  26                 brightness-levels = <0 4 8 16 32 64 128 255>;
  27                 default-brightness-level = <6>;
  28         };