linux-arkmicro/linux/Documentation/devicetree/bindings/sound/simple-amplifier.txt

Simple Amplifier Audio Driver

Required properties:
- compatible : "dioo,dio2125" or "simple-audio-amplifier"
- enable-gpios : the gpio connected to the enable pin of the simple amplifier

Example:

amp: analog-amplifier {
	compatible = "simple-audio-amplifier";
	enable-gpios = <&gpio GPIOH_3 0>;
};