36 lines
1.3 KiB
Plaintext
36 lines
1.3 KiB
Plaintext
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pwm-backlight bindings
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Required properties:
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- compatible: "pwm-backlight"
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- pwms: OF device-tree PWM specification (see PWM binding[0])
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- brightness-levels: Array of distinct brightness levels. Typically these
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are in the range from 0 to 255, but any range starting at 0 will do.
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The actual brightness level (PWM duty cycle) will be interpolated
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from these values. 0 means a 0% duty cycle (darkest/off), while the
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last value in the array represents a 100% duty cycle (brightest).
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- default-brightness-level: the default brightness level (index into the
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array defined by the "brightness-levels" property)
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- power-supply: regulator for supply voltage
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Optional properties:
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- pwm-names: a list of names for the PWM devices specified in the
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"pwms" property (see PWM binding[0])
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- enable-gpios: contains a single GPIO specifier for the GPIO which enables
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and disables the backlight (see GPIO binding[1])
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[0]: Documentation/devicetree/bindings/pwm/pwm.txt
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[1]: Documentation/devicetree/bindings/gpio/gpio.txt
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Example:
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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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};
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