leds/backlight/pwm-backlight.yaml

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
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:
32   post-pwm-on-delay-ms:
34       Delay in ms between setting an initial (non-zero) PWM and enabling the
37   pwm-off-delay-ms:
42   brightness-levels:
44       Array of distinct brightness levels. Typically these are in the range
45       from 0 to 255, but any range starting at 0 will do. The actual brightness
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:
53       The default brightness level (index into the array defined by the
54       "brightness-levels" property).
57   num-interpolated-steps:
59       Number of interpolated steps between each value of brightness-levels
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
75   - |
77         compatible = "pwm-backlight";
80         brightness-levels = <0 4 8 16 32 64 128 255>;
81         default-brightness-level = <6>;
83         power-supply = <&vdd_bl_reg>;
84         enable-gpios = <&gpio 58 0>;
85         post-pwm-on-delay-ms = <10>;
86         pwm-off-delay-ms = <10>;
89   - |
90     // Example using num-interpolation-steps:
92         compatible = "pwm-backlight";
95         brightness-levels = <0 2048 4096 8192 16384 65535>;
96         num-interpolated-steps = <2048>;
97         default-brightness-level = <4096>;
99         power-supply = <&vdd_bl_reg>;
100         enable-gpios = <&gpio 58 0>;