linux/Documentation/devicetree/bindings/sound/wm8903.txt
<<
>>
Prefs
   1WM8903 audio CODEC
   2
   3This device supports I2C only.
   4
   5Required properties:
   6
   7  - compatible : "wlf,wm8903"
   8
   9  - reg : the I2C address of the device.
  10
  11  - gpio-controller : Indicates this device is a GPIO controller.
  12
  13  - #gpio-cells : Should be two. The first cell is the pin number and the
  14    second cell is used to specify optional parameters (currently unused).
  15
  16Optional properties:
  17
  18  - interrupts : The interrupt line the codec is connected to.
  19
  20  - micdet-cfg : Default register value for R6 (Mic Bias). If absent, the
  21    default is 0.
  22
  23  - micdet-delay : The debounce delay for microphone detection in mS. If
  24    absent, the default is 100.
  25
  26  - gpio-cfg : A list of GPIO configuration register values. The list must
  27    be 5 entries long. If absent, no configuration of these registers is
  28    performed. If any entry has the value 0xffffffff, that GPIO's
  29    configuration will not be modified.
  30
  31Example:
  32
  33codec: wm8903@1a {
  34        compatible = "wlf,wm8903";
  35        reg = <0x1a>;
  36        interrupts = < 347 >;
  37
  38        gpio-controller;
  39        #gpio-cells = <2>;
  40
  41        micdet-cfg = <0>;
  42        micdet-delay = <100>;
  43        gpio-cfg = <
  44                0x0600 /* DMIC_LR, output */
  45                0x0680 /* DMIC_DAT, input */
  46                0x0000 /* GPIO, output, low */
  47                0x0200 /* Interrupt, output */
  48                0x01a0 /* BCLK, input, active high */
  49        >;
  50};
  51