LED connected to PWM
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Required properties:
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- compatible : should be "pwm-leds".
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Each LED is represented as a sub-node of the pwm-leds device. Each
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node's name represents the name of the corresponding LED.
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LED sub-node properties:
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- pwms : PWM property to point to the PWM device (phandle)/port (id) and to
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specify the period time to be used: <&phandle id period_ns>;
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- pwm-names : (optional) Name to be used by the PWM subsystem for the PWM device
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For the pwms and pwm-names property please refer to:
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Documentation/devicetree/bindings/pwm/pwm.txt
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- max-brightness : Maximum brightness possible for the LED
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- active-low : (optional) For PWMs where the LED is wired to supply
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rather than ground.
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- label : (optional)
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see Documentation/devicetree/bindings/leds/common.txt
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- linux,default-trigger : (optional)
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see Documentation/devicetree/bindings/leds/common.txt
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Example:
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twl_pwm: pwm {
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/* provides two PWMs (id 0, 1 for PWM1 and PWM2) */
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compatible = "ti,twl6030-pwm";
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#pwm-cells = <2>;
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};
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twl_pwmled: pwmled {
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/* provides one PWM (id 0 for Charing indicator LED) */
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compatible = "ti,twl6030-pwmled";
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#pwm-cells = <2>;
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};
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pwmleds {
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compatible = "pwm-leds";
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kpad {
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label = "omap4::keypad";
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pwms = <&twl_pwm 0 7812500>;
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max-brightness = <127>;
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};
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charging {
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label = "omap4:green:chrg";
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pwms = <&twl_pwmled 0 7812500>;
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max-brightness = <255>;
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};
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};
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