* PWM vibrator device tree bindings
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Registers a PWM device as vibrator. It is expected, that the vibrator's
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strength increases based on the duty cycle of the enable PWM channel
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(100% duty cycle meaning strongest vibration, 0% meaning no vibration).
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The binding supports an optional direction PWM channel, that can be
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driven at fixed duty cycle. If available this is can be used to increase
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the vibration effect of some devices.
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Required properties:
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- compatible: should contain "pwm-vibrator"
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- pwm-names: Should contain "enable" and optionally "direction"
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- pwms: Should contain a PWM handle for each entry in pwm-names
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Optional properties:
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- vcc-supply: Phandle for the regulator supplying power
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- direction-duty-cycle-ns: Duty cycle of the direction PWM channel in
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nanoseconds, defaults to 50% of the channel's
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period.
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Example from Motorola Droid 4:
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&omap4_pmx_core {
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vibrator_direction_pin: pinmux_vibrator_direction_pin {
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pinctrl-single,pins = <
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OMAP4_IOPAD(0x1ce, PIN_OUTPUT | MUX_MODE1) /* dmtimer8_pwm_evt (gpio_27) */
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>;
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};
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vibrator_enable_pin: pinmux_vibrator_enable_pin {
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pinctrl-single,pins = <
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OMAP4_IOPAD(0X1d0, PIN_OUTPUT | MUX_MODE1) /* dmtimer9_pwm_evt (gpio_28) */
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>;
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};
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};
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/ {
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pwm8: dmtimer-pwm {
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pinctrl-names = "default";
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pinctrl-0 = <&vibrator_direction_pin>;
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compatible = "ti,omap-dmtimer-pwm";
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#pwm-cells = <3>;
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ti,timers = <&timer8>;
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ti,clock-source = <0x01>;
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};
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pwm9: dmtimer-pwm {
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pinctrl-names = "default";
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pinctrl-0 = <&vibrator_enable_pin>;
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compatible = "ti,omap-dmtimer-pwm";
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#pwm-cells = <3>;
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ti,timers = <&timer9>;
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ti,clock-source = <0x01>;
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};
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vibrator {
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compatible = "pwm-vibrator";
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pwms = <&pwm9 0 1000000000 0>,
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<&pwm8 0 1000000000 0>;
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pwm-names = "enable", "direction";
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direction-duty-cycle-ns = <1000000000>;
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};
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};
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