2012-12-21 09:44:01 +00:00
|
|
|
LED connected to PWM
|
|
|
|
|
|
|
|
|
|
Required properties:
|
|
|
|
|
- compatible : should be "pwm-leds".
|
|
|
|
|
|
|
|
|
|
Each LED is represented as a sub-node of the pwm-leds device. Each
|
|
|
|
|
node's name represents the name of the corresponding LED.
|
|
|
|
|
|
|
|
|
|
LED sub-node properties:
|
|
|
|
|
- pwms : PWM property to point to the PWM device (phandle)/port (id) and to
|
|
|
|
|
specify the period time to be used: <&phandle id period_ns>;
|
|
|
|
|
- pwm-names : (optional) Name to be used by the PWM subsystem for the PWM device
|
|
|
|
|
For the pwms and pwm-names property please refer to:
|
|
|
|
|
Documentation/devicetree/bindings/pwm/pwm.txt
|
|
|
|
|
- max-brightness : Maximum brightness possible for the LED
|
2014-04-06 22:20:24 +00:00
|
|
|
- active-low : (optional) For PWMs where the LED is wired to supply
|
|
|
|
|
rather than ground.
|
2012-12-21 09:44:01 +00:00
|
|
|
- label : (optional)
|
|
|
|
|
see Documentation/devicetree/bindings/leds/common.txt
|
|
|
|
|
- linux,default-trigger : (optional)
|
|
|
|
|
see Documentation/devicetree/bindings/leds/common.txt
|
|
|
|
|
|
|
|
|
|
Example:
|
|
|
|
|
|
|
|
|
|
twl_pwm: pwm {
|
|
|
|
|
/* provides two PWMs (id 0, 1 for PWM1 and PWM2) */
|
|
|
|
|
compatible = "ti,twl6030-pwm";
|
|
|
|
|
#pwm-cells = <2>;
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
twl_pwmled: pwmled {
|
|
|
|
|
/* provides one PWM (id 0 for Charing indicator LED) */
|
|
|
|
|
compatible = "ti,twl6030-pwmled";
|
|
|
|
|
#pwm-cells = <2>;
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
pwmleds {
|
|
|
|
|
compatible = "pwm-leds";
|
|
|
|
|
kpad {
|
|
|
|
|
label = "omap4::keypad";
|
|
|
|
|
pwms = <&twl_pwm 0 7812500>;
|
|
|
|
|
max-brightness = <127>;
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
charging {
|
|
|
|
|
label = "omap4:green:chrg";
|
|
|
|
|
pwms = <&twl_pwmled 0 7812500>;
|
|
|
|
|
max-brightness = <255>;
|
|
|
|
|
};
|
|
|
|
|
};
|
