linux/Documentation/devicetree/bindings/sound/wm8770.txt
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Prefs
   1WM8770 audio CODEC
   2
   3This device supports SPI.
   4
   5Required properties:
   6
   7  - compatible : "wlf,wm8770"
   8
   9  - reg : the chip select number.
  10
  11Example:
  12
  13codec: wm8770@1 {
  14        compatible = "wlf,wm8770";
  15        reg = <1>;
  16};
  17