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Ingenic JZ4740 codec controller

Required properties:
- compatible : "ingenic,jz4740-codec"
- reg : codec registers location and length
- clocks : phandle to the AIC clock.
- clock-names: must be set to "aic".
- #sound-dai-cells: Must be set to 0.

Example:

codec: audio-codec@10020080 {
	compatible = "ingenic,jz4740-codec";
	reg = <0x10020080 0x8>;

	#sound-dai-cells = <0>;

	clocks = <&cgu JZ4740_CLK_AIC>;
	clock-names = "aic";
};