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| author | David Lechner <david@lechnology.com> | 2017-01-15 17:09:43 -0800 |
|---|---|---|
| committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2017-01-22 00:23:22 -0800 |
| commit | 9e54924432783bfb21e905e0bf7042556bcb4b90 (patch) | |
| tree | 7ddeb37703ff995a06ee4e77f3c429256a3320cc /Documentation | |
| parent | 62481881401246859d9bd06b7c7b9a391c78892c (diff) | |
| download | linux-9e54924432783bfb21e905e0bf7042556bcb4b90.tar.gz | |
Input: pwm-beeper - add optional amplifier regulator
This adds an optional regulator to the pwm-beeper device. This regulator acts as an amplifier. The amplifier is only enabled while beeping in order to reduce power consumption. Tested on LEGO MINDSTORMS EV3, which has a speaker connected to PWM through an amplifier. Signed-off-by: David Lechner <david@lechnology.com> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/devicetree/bindings/input/pwm-beeper.txt | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/input/pwm-beeper.txt b/Documentation/devicetree/bindings/input/pwm-beeper.txt index be332ae4f2d6..529408b4431a 100644 --- a/Documentation/devicetree/bindings/input/pwm-beeper.txt +++ b/Documentation/devicetree/bindings/input/pwm-beeper.txt @@ -5,3 +5,19 @@ Registers a PWM device as beeper. Required properties: - compatible: should be "pwm-beeper" - pwms: phandle to the physical PWM device + +Optional properties: +- amp-supply: phandle to a regulator that acts as an amplifier for the beeper + +Example: + +beeper_amp: amplifier { + compatible = "fixed-regulator"; + gpios = <&gpio0 1 GPIO_ACTIVE_HIGH>; +}; + +beeper { + compatible = "pwm-beeper"; + pwms = <&pwm0>; + amp-supply = <&beeper_amp>; +}; |