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| author | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2017-09-15 18:52:21 +0200 |
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| committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2017-09-15 18:52:21 +0200 |
| commit | bbc8608755da42e7494c00dce24a636007972def (patch) | |
| tree | 7db003ee57a435042dedfa6664aef31c24922c04 /Documentation | |
| parent | Merge branch 'next' into for-linus (diff) | |
| parent | Input: i8042 - add Gigabyte P57 to the keyboard reset table (diff) | |
| download | linux-bbc8608755da42e7494c00dce24a636007972def.tar.xz linux-bbc8608755da42e7494c00dce24a636007972def.zip | |
Merge branch 'next' into for-linus
Prepare second round of input updates for 4.14 merge window.
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/devicetree/bindings/input/pwm-vibrator.txt | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/input/pwm-vibrator.txt b/Documentation/devicetree/bindings/input/pwm-vibrator.txt new file mode 100644 index 000000000000..09145d18491d --- /dev/null +++ b/Documentation/devicetree/bindings/input/pwm-vibrator.txt @@ -0,0 +1,66 @@ +* PWM vibrator device tree bindings + +Registers a PWM device as vibrator. It is expected, that the vibrator's +strength increases based on the duty cycle of the enable PWM channel +(100% duty cycle meaning strongest vibration, 0% meaning no vibration). + +The binding supports an optional direction PWM channel, that can be +driven at fixed duty cycle. If available this is can be used to increase +the vibration effect of some devices. + +Required properties: +- compatible: should contain "pwm-vibrator" +- pwm-names: Should contain "enable" and optionally "direction" +- pwms: Should contain a PWM handle for each entry in pwm-names + +Optional properties: +- vcc-supply: Phandle for the regulator supplying power +- direction-duty-cycle-ns: Duty cycle of the direction PWM channel in + nanoseconds, defaults to 50% of the channel's + period. + +Example from Motorola Droid 4: + +&omap4_pmx_core { + vibrator_direction_pin: pinmux_vibrator_direction_pin { + pinctrl-single,pins = < + OMAP4_IOPAD(0x1ce, PIN_OUTPUT | MUX_MODE1) /* dmtimer8_pwm_evt (gpio_27) */ + >; + }; + + vibrator_enable_pin: pinmux_vibrator_enable_pin { + pinctrl-single,pins = < + OMAP4_IOPAD(0X1d0, PIN_OUTPUT | MUX_MODE1) /* dmtimer9_pwm_evt (gpio_28) */ + >; + }; +}; + +/ { + pwm8: dmtimer-pwm { + pinctrl-names = "default"; + pinctrl-0 = <&vibrator_direction_pin>; + + compatible = "ti,omap-dmtimer-pwm"; + #pwm-cells = <3>; + ti,timers = <&timer8>; + ti,clock-source = <0x01>; + }; + + pwm9: dmtimer-pwm { + pinctrl-names = "default"; + pinctrl-0 = <&vibrator_enable_pin>; + + compatible = "ti,omap-dmtimer-pwm"; + #pwm-cells = <3>; + ti,timers = <&timer9>; + ti,clock-source = <0x01>; + }; + + vibrator { + compatible = "pwm-vibrator"; + pwms = <&pwm8 0 1000000000 0>, + <&pwm9 0 1000000000 0>; + pwm-names = "enable", "direction"; + direction-duty-cycle-ns = <1000000000>; + }; +}; |