Documentation/devicetree/bindings/sound/rockchip,rk3399-gru-sound.txt

   1 ROCKCHIP with MAX98357A/RT5514/DA7219 codecs on GRU boards
   2
   3 Required properties:
   4 - compatible: "rockchip,rk3399-gru-sound"
   5 - rockchip,cpu: The phandle of the Rockchip I2S controller that's
   6   connected to the codecs
   7 - rockchip,codec: The phandle of the audio codecs
   8
   9 Optional properties:
  10 - dmic-wakeup-delay-ms : specify delay time (ms) for DMIC ready.
  11   If this option is specified, which means it's required dmic need
  12   delay for DMIC to ready so that rt5514 can avoid recording before
  13   DMIC send valid data
  14
  15 Example:
  16
  17 sound {
  18         compatible = "rockchip,rk3399-gru-sound";
  19         rockchip,cpu = <&i2s0>;
  20         rockchip,codec = <&max98357a &rt5514 &da7219>;
  21         dmic-wakeup-delay-ms = <20>;
  22 };