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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.

Pins on the device (for linking into audio routes):

  * IN1L
  * IN1R
  * IN2L
  * IN2R
  * IN3L
  * IN3R
  * DMICDAT
  * HPOUTL
  * HPOUTR
  * LINEOUTL
  * LINEOUTR
  * LOP
  * LON
  * ROP
  * RON
  * MICBIAS

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 */
	>;
};