tegrakernel/kernel/kernel-4.9/Documentation/devicetree/bindings/input/gpio-beeper.txt

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* GPIO beeper device tree bindings
Register a beeper connected to GPIO pin.
Required properties:
- compatible: Should be "gpio-beeper".
- gpios: From common gpio binding; gpio connection to beeper enable pin.
Example:
beeper: beeper {
compatible = "gpio-beeper";
gpios = <&gpio3 23 GPIO_ACTIVE_HIGH>;
};