Kernel-3.10.0-957.el7_pwm-backlight

pwm-backlight bindings

Required properties:

• compatible: “pwm-backlight”
• pwms: OF device-tree PWM specification (see PWM binding0)
• brightness-levels: Array of distinct brightness levels. Typically these
  are in the range from 0 to 255, but any range starting at 0 will do.
  The actual brightness level (PWM duty cycle) will be interpolated
  from these values. 0 means a 0% duty cycle (darkest/off), while the
  last value in the array represents a 100% duty cycle (brightest).
• default-brightness-level: the default brightness level (index into the
  array defined by the “brightness-levels” property)

Optional properties:

• pwm-names: a list of names for the PWM devices specified in the

         "pwms" property (see PWM binding[0])
  

Example:

backlight {
    compatible = "pwm-backlight";
    pwms = <&pwm 0 5000000>;

    brightness-levels = <0 4 8 16 32 64 128 255>;
    default-brightness-level = <6>;
};