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Both files pwm-backlight.yaml and led-backlight.yaml contain properties in common with each other, regarding the brightness levels: - brightness-levels - default-brightness-level These properties can then be moved to backlight/common.yaml. Signed-off-by: Flavio Suligoi <f.suligoi@asem.it> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> Reviewed-by: Rob Herring <robh@kernel.org> Link: https://lore.kernel.org/r/20231016150554.27144-1-f.suligoi@asem.it Signed-off-by: Lee Jones <lee@kernel.org>
91 lines
2.1 KiB
YAML
91 lines
2.1 KiB
YAML
# 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
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maintainers:
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- Lee Jones <lee@kernel.org>
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- Daniel Thompson <daniel.thompson@linaro.org>
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- Jingoo Han <jingoohan1@gmail.com>
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allOf:
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- $ref: common.yaml#
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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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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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unevaluatedProperties: 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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