Lines Matching +full:pwm +full:- +full:backlight
1 # SPDX-License-Identifier: GPL-2.0-only
3 ---
4 $id: http://devicetree.org/schemas/leds/backlight/pwm-backlight.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: pwm-backlight bindings
10 - Lee Jones <lee@kernel.org>
11 - Daniel Thompson <daniel.thompson@linaro.org>
12 - Jingoo Han <jingoohan1@gmail.com>
16 const: pwm-backlight
21 pwm-names: true
23 power-supply:
26 enable-gpios:
29 the backlight.
32 post-pwm-on-delay-ms:
34 Delay in ms between setting an initial (non-zero) PWM and enabling the
35 backlight using GPIO.
37 pwm-off-delay-ms:
39 Delay in ms between disabling the backlight using GPIO and setting PWM
42 brightness-levels:
46 level (PWM duty cycle) will be interpolated from these values. 0 means a
49 $ref: /schemas/types.yaml#/definitions/uint32-array
51 default-brightness-level:
54 "brightness-levels" property).
57 num-interpolated-steps:
59 Number of interpolated steps between each value of brightness-levels
60 table. This way a high resolution pwm duty cycle can be used without
61 having to list out every possible value in the brightness-level array.
65 default-brightness-level: [brightness-levels]
66 num-interpolated-steps: [brightness-levels]
69 - compatible
70 - pwms
71 - power-supply
76 - |
77 backlight {
78 compatible = "pwm-backlight";
79 pwms = <&pwm 0 5000000>;
81 brightness-levels = <0 4 8 16 32 64 128 255>;
82 default-brightness-level = <6>;
84 power-supply = <&vdd_bl_reg>;
85 enable-gpios = <&gpio 58 0>;
86 post-pwm-on-delay-ms = <10>;
87 pwm-off-delay-ms = <10>;
90 - |
91 // Example using num-interpolation-steps:
92 backlight {
93 compatible = "pwm-backlight";
94 pwms = <&pwm 0 5000000>;
96 brightness-levels = <0 2048 4096 8192 16384 65535>;
97 num-interpolated-steps = <2048>;
98 default-brightness-level = <4096>;
100 power-supply = <&vdd_bl_reg>;
101 enable-gpios = <&gpio 58 0>;