1* PWM vibrator device tree bindings 2 3Registers a PWM device as vibrator. It is expected, that the vibrator's 4strength increases based on the duty cycle of the enable PWM channel 5(100% duty cycle meaning strongest vibration, 0% meaning no vibration). 6 7The binding supports an optional direction PWM channel, that can be 8driven at fixed duty cycle. If available this is can be used to increase 9the vibration effect of some devices. 10 11Required properties: 12- compatible: should contain "pwm-vibrator" 13- pwm-names: Should contain "enable" and optionally "direction" 14- pwms: Should contain a PWM handle for each entry in pwm-names 15 16Optional properties: 17- vcc-supply: Phandle for the regulator supplying power 18- direction-duty-cycle-ns: Duty cycle of the direction PWM channel in 19 nanoseconds, defaults to 50% of the channel's 20 period. 21 22Example from Motorola Droid 4: 23 24&omap4_pmx_core { 25 vibrator_direction_pin: pinmux_vibrator_direction_pin { 26 pinctrl-single,pins = < 27 OMAP4_IOPAD(0x1ce, PIN_OUTPUT | MUX_MODE1) /* dmtimer8_pwm_evt (gpio_27) */ 28 >; 29 }; 30 31 vibrator_enable_pin: pinmux_vibrator_enable_pin { 32 pinctrl-single,pins = < 33 OMAP4_IOPAD(0X1d0, PIN_OUTPUT | MUX_MODE1) /* dmtimer9_pwm_evt (gpio_28) */ 34 >; 35 }; 36}; 37 38/ { 39 pwm8: dmtimer-pwm { 40 pinctrl-names = "default"; 41 pinctrl-0 = <&vibrator_direction_pin>; 42 43 compatible = "ti,omap-dmtimer-pwm"; 44 #pwm-cells = <3>; 45 ti,timers = <&timer8>; 46 ti,clock-source = <0x01>; 47 }; 48 49 pwm9: dmtimer-pwm { 50 pinctrl-names = "default"; 51 pinctrl-0 = <&vibrator_enable_pin>; 52 53 compatible = "ti,omap-dmtimer-pwm"; 54 #pwm-cells = <3>; 55 ti,timers = <&timer9>; 56 ti,clock-source = <0x01>; 57 }; 58 59 vibrator { 60 compatible = "pwm-vibrator"; 61 pwms = <&pwm9 0 1000000000 0>, 62 <&pwm8 0 1000000000 0>; 63 pwm-names = "enable", "direction"; 64 direction-duty-cycle-ns = <1000000000>; 65 }; 66}; 67