Lines Matching +full:pwm +full:- +full:gpio
1 pwm-backlight bindings
4 - compatible: "pwm-backlight"
5 - pwms: OF device-tree PWM specification (see PWM binding[0])
6 - power-supply: regulator for supply voltage
9 - pwm-names: a list of names for the PWM devices specified in the
10 "pwms" property (see PWM binding[0])
11 - enable-gpios: contains a single GPIO specifier for the GPIO which enables
12 and disables the backlight (see GPIO binding[1])
13 - post-pwm-on-delay-ms: Delay in ms between setting an initial (non-zero) PWM
14 and enabling the backlight using GPIO.
15 - pwm-off-delay-ms: Delay in ms between disabling the backlight using GPIO
16 and setting PWM value to 0.
17 - brightness-levels: Array of distinct brightness levels. Typically these
19 0 will do. The actual brightness level (PWM duty cycle)
23 - default-brightness-level: The default brightness level (index into the
24 array defined by the "brightness-levels" property).
25 - num-interpolated-steps: Number of interpolated steps between each value
26 of brightness-levels table. This way a high
27 resolution pwm duty cycle can be used without
29 brightness-level array.
31 [0]: Documentation/devicetree/bindings/pwm/pwm.txt
32 [1]: Documentation/devicetree/bindings/gpio/gpio.txt
37 compatible = "pwm-backlight";
38 pwms = <&pwm 0 5000000>;
40 brightness-levels = <0 4 8 16 32 64 128 255>;
41 default-brightness-level = <6>;
43 power-supply = <&vdd_bl_reg>;
44 enable-gpios = <&gpio 58 0>;
45 post-pwm-on-delay-ms = <10>;
46 pwm-off-delay-ms = <10>;
49 Example using num-interpolation-steps:
52 compatible = "pwm-backlight";
53 pwms = <&pwm 0 5000000>;
55 brightness-levels = <0 2048 4096 8192 16384 65535>;
56 num-interpolated-steps = <2048>;
57 default-brightness-level = <4096>;
59 power-supply = <&vdd_bl_reg>;
60 enable-gpios = <&gpio 58 0>;