Rockchip DRM backlight device
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Rockchip display controller(see VOP bindings[0]) support CABC function,
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and the CABC function required using VOP self pwm to control backlight,
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This backlight device manager the backlight PWM, auto select correct
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PWM for backlight.
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Required properties:
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- compatible: Should be "rockchip,drm-backlight"
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Other properties are same to commom PWM backlight bindings[1].
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[0]: Documentation/devicetree/bindings/display/rockchip/rockchip-vop.txt
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[1]: Documentation/devicetree/bindings/leds/backlight/pwm-backlight.txt
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example:
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backlight {
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compatible = "rockchip,drm-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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};
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