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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.

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 */
	>;
};