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Device-Tree bindings for Digital microphone (DMIC) codec

This device support generic PDM digital microphone.

Required properties:
	- compatible: should be "dmic-codec".

Optional properties:
	- dmicen-gpios: GPIO specifier for dmic to control start and stop

Example node:

	dmic_codec: dmic@0 {
		compatible = "dmic-codec";
		dmicen-gpios = <&gpio4 3 GPIO_ACTIVE_HIGH>;
	};
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