Cirrus Logic Madera class audio codecs mic supply regulator driver

Only required if the codec has an internal mic supply regulator.

See also the core bindings for the parent MFD driver:
See Documentation/devicetree/bindinge/mfd/madera.txt

Optional subnodes:

  - micvdd : Initial data for the MICVDD regulator, as covered in
    Documentation/devicetree/bindings/regulator/regulator.txt

Example:

codec: cs47l85@0 {
	compatible = "cirrus,cs47l85";

	micvdd {
		regulator-min-microvolt = <900000>;
		regulator-max-microvolt = <3300000>;
		regulator-allow-bypass = <1>;
	};
};