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CS42448/CS42888 audio CODEC

Required properties:

  - compatible : must contain one of "cirrus,cs42448" and "cirrus,cs42888"

  - reg : the I2C address of the device for I2C

  - clocks : a list of phandles + clock-specifiers, one for each entry in
    clock-names

  - clock-names : must contain "mclk"

  - VA-supply, VD-supply, VLS-supply, VLC-supply: power supplies for the device,
    as covered in Documentation/devicetree/bindings/regulator/regulator.txt

Optional properties:

  - reset-gpios : a GPIO spec to define which pin is connected to the chip's
    !RESET pin

Example:

cs42888: codec@48 {
	compatible = "cirrus,cs42888";
	reg = <0x48>;
	clocks = <&codec_mclk 0>;
	clock-names = "mclk";
	VA-supply = <&reg_audio>;
	VD-supply = <&reg_audio>;
	VLS-supply = <&reg_audio>;
	VLC-supply = <&reg_audio>;
	reset-gpios = <&pca9557_b 1 GPIO_ACTIVE_LOW>;
};