projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 08541cbc PU |
1 | LED connected to PWM |
| 2 | ||
| 3 | Required properties: | |
| 4 | - compatible : should be "pwm-leds". | |
| 5 | ||
| 6 | Each LED is represented as a sub-node of the pwm-leds device. Each | |
| 7 | node's name represents the name of the corresponding LED. | |
| 8 | ||
| 9 | LED sub-node properties: | |
| 10 | - pwms : PWM property to point to the PWM device (phandle)/port (id) and to | |
| 11 | specify the period time to be used: <&phandle id period_ns>; | |
| 12 | - pwm-names : (optional) Name to be used by the PWM subsystem for the PWM device | |
| 13 | For the pwms and pwm-names property please refer to: | |
| 14 | Documentation/devicetree/bindings/pwm/pwm.txt | |
| 15 | - max-brightness : Maximum brightness possible for the LED | |
| b0571e7e RK |
16 | - active-low : (optional) For PWMs where the LED is wired to supply |
| 17 | rather than ground. | |
| 08541cbc PU |
18 | - label : (optional) |
| 19 | see Documentation/devicetree/bindings/leds/common.txt | |
| 20 | - linux,default-trigger : (optional) | |
| 21 | see Documentation/devicetree/bindings/leds/common.txt | |
| 22 | ||
| 23 | Example: | |
| 24 | ||
| 25 | twl_pwm: pwm { | |
| 26 | /* provides two PWMs (id 0, 1 for PWM1 and PWM2) */ | |
| 27 | compatible = "ti,twl6030-pwm"; | |
| 28 | #pwm-cells = <2>; | |
| 29 | }; | |
| 30 | ||
| 31 | twl_pwmled: pwmled { | |
| 32 | /* provides one PWM (id 0 for Charing indicator LED) */ | |
| 33 | compatible = "ti,twl6030-pwmled"; | |
| 34 | #pwm-cells = <2>; | |
| 35 | }; | |
| 36 | ||
| 37 | pwmleds { | |
| 38 | compatible = "pwm-leds"; | |
| 39 | kpad { | |
| 40 | label = "omap4::keypad"; | |
| 41 | pwms = <&twl_pwm 0 7812500>; | |
| 42 | max-brightness = <127>; | |
| 43 | }; | |
| 44 | ||
| 45 | charging { | |
| 46 | label = "omap4:green:chrg"; | |
| 47 | pwms = <&twl_pwmled 0 7812500>; | |
| 48 | max-brightness = <255>; | |
| 49 | }; | |
| 50 | }; |