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authorDavid Lechner <david@lechnology.com>2017-01-16 04:09:43 +0300
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2017-01-22 11:23:22 +0300
commit9e54924432783bfb21e905e0bf7042556bcb4b90 (patch)
tree7ddeb37703ff995a06ee4e77f3c429256a3320cc /Documentation/devicetree/bindings/input
parent62481881401246859d9bd06b7c7b9a391c78892c (diff)
downloadlinux-9e54924432783bfb21e905e0bf7042556bcb4b90.tar.xz
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/devicetree/bindings/input')
-rw-r--r--Documentation/devicetree/bindings/input/pwm-beeper.txt16
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>;
+};