linux_old1/Documentation/devicetree/bindings/sound/wm8994.txt

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WM1811/WM8994/WM8958 audio CODEC
These devices support both I2C and SPI (configured with pin strapping
on the board).
Required properties:
- compatible : "wlf,wm1811", "wlf,wm8994", "wlf,wm8958"
- reg : the I2C address of the device for I2C, the chip select
number for SPI.
Example:
codec: wm8994@1a {
compatible = "wlf,wm8994";
reg = <0x1a>;
};