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104 lines
2.8 KiB
104 lines
2.8 KiB
# SPDX-License-Identifier: GPL-2.0-only |
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%YAML 1.2 |
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--- |
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$id: http://devicetree.org/schemas/leds/backlight/pwm-backlight.yaml# |
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$schema: http://devicetree.org/meta-schemas/core.yaml# |
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title: pwm-backlight bindings |
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maintainers: |
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- Lee Jones <[email protected]> |
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- Daniel Thompson <[email protected]> |
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- Jingoo Han <[email protected]> |
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properties: |
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compatible: |
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const: pwm-backlight |
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pwms: |
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maxItems: 1 |
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pwm-names: true |
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power-supply: |
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description: regulator for supply voltage |
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enable-gpios: |
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description: |
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Contains a single GPIO specifier for the GPIO which enables and disables |
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the backlight. |
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maxItems: 1 |
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post-pwm-on-delay-ms: |
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description: |
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Delay in ms between setting an initial (non-zero) PWM and enabling the |
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backlight using GPIO. |
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pwm-off-delay-ms: |
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description: |
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Delay in ms between disabling the backlight using GPIO and setting PWM |
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value to 0. |
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brightness-levels: |
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description: |
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Array of distinct brightness levels. Typically these are in the range |
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from 0 to 255, but any range starting at 0 will do. The actual brightness |
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level (PWM duty cycle) will be interpolated from these values. 0 means a |
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0% duty cycle (darkest/off), while the last value in the array represents |
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a 100% duty cycle (brightest). |
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$ref: /schemas/types.yaml#/definitions/uint32-array |
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default-brightness-level: |
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description: |
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The default brightness level (index into the array defined by the |
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"brightness-levels" property). |
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$ref: /schemas/types.yaml#/definitions/uint32 |
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num-interpolated-steps: |
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description: |
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Number of interpolated steps between each value of brightness-levels |
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table. This way a high resolution pwm duty cycle can be used without |
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having to list out every possible value in the brightness-level array. |
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$ref: /schemas/types.yaml#/definitions/uint32 |
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dependencies: |
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default-brightness-level: [brightness-levels] |
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num-interpolated-steps: [brightness-levels] |
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required: |
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- compatible |
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- pwms |
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- power-supply |
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additionalProperties: false |
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examples: |
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- | |
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backlight { |
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compatible = "pwm-backlight"; |
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pwms = <&pwm 0 5000000>; |
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brightness-levels = <0 4 8 16 32 64 128 255>; |
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default-brightness-level = <6>; |
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power-supply = <&vdd_bl_reg>; |
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enable-gpios = <&gpio 58 0>; |
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post-pwm-on-delay-ms = <10>; |
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pwm-off-delay-ms = <10>; |
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}; |
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- | |
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// Example using num-interpolation-steps: |
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backlight { |
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compatible = "pwm-backlight"; |
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pwms = <&pwm 0 5000000>; |
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brightness-levels = <0 2048 4096 8192 16384 65535>; |
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num-interpolated-steps = <2048>; |
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default-brightness-level = <4096>; |
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power-supply = <&vdd_bl_reg>; |
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enable-gpios = <&gpio 58 0>; |
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}; |
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...
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