linux-zen-desktop/Documentation/devicetree/bindings/sound/wm8524.txt

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WM8524 audio CODEC
This device does not use I2C or SPI but a simple Hardware Control Interface.
Required properties:
- compatible : "wlf,wm8524"
- wlf,mute-gpios: a GPIO spec for the MUTE pin.
Example:
wm8524: codec {
compatible = "wlf,wm8524";
wlf,mute-gpios = <&gpio1 8 GPIO_ACTIVE_LOW>;
};