Based on kernel version 4.3. Page generated on 2015-11-02 12:47 EST.
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 - power-supply: regulator for supply voltage 14 15 Optional properties: 16 - pwm-names: a list of names for the PWM devices specified in the 17 "pwms" property (see PWM binding[0]) 18 - enable-gpios: contains a single GPIO specifier for the GPIO which enables 19 and disables the backlight (see GPIO binding[1]) 20 21 [0]: Documentation/devicetree/bindings/pwm/pwm.txt 22 [1]: Documentation/devicetree/bindings/gpio/gpio.txt 23 24 Example: 25 26 backlight { 27 compatible = "pwm-backlight"; 28 pwms = <&pwm 0 5000000>; 29 30 brightness-levels = <0 4 8 16 32 64 128 255>; 31 default-brightness-level = <6>; 32 33 power-supply = <&vdd_bl_reg>; 34 enable-gpios = <&gpio 58 0>; 35 };