Kernel-3.10.0-957.el7_wm8903

WM8903 audio CODEC

This device supports I2C only.

Required properties:

• compatible : “wlf,wm8903”

• reg : the I2C address of the device.

• gpio-controller : Indicates this device is a GPIO controller.

• #gpio-cells : Should be two. The first cell is the pin number and the
  second cell is used to specify optional parameters (currently unused).

Optional properties:

• interrupts : The interrupt line the codec is connected to.

• micdet-cfg : Default register value for R6 (Mic Bias). If absent, the
  default is 0.

• micdet-delay : The debounce delay for microphone detection in mS. If
  absent, the default is 100.

• gpio-cfg : A list of GPIO configuration register values. The list must
  be 5 entries long. If absent, no configuration of these registers is
  performed. If any entry has the value 0xffffffff, that GPIO’s
  configuration will not be modified.

Example:

codec: wm8903@1a {
compatible = “wlf,wm8903”;
reg = <0x1a>;
interrupts = < 347 >;

gpio-controller;
#gpio-cells = <2>;

micdet-cfg = <0>;
micdet-delay = <100>;
gpio-cfg = <
    0x0600 /* DMIC_LR, output */
    0x0680 /* DMIC_DAT, input */
    0x0000 /* GPIO, output, low */
    0x0200 /* Interrupt, output */
    0x01a0 /* BCLK, input, active high */
>;

};