dt-bindings: mux: add adi,adgs1408

Bindings for Analog Devices ADGS1408/1409 8:1/Dual 4:1 Mux

Required properties:

- compatible : Should be one of

	* "adi,adgs1408"

	* "adi,adgs1409"

* Standard mux-controller bindings as described in mux-controller.txt

Optional properties for ADGS1408/1409:

- gpio-controller : if present, #gpio-cells is required.

- #gpio-cells : should be <2>

			- First cell is the GPO line number, i.e. 0 to 3

			for ADGS1408 and 0 to 4 for ADGS1409

			- Second cell is used to specify active high (0)

			or active low (1)

Optional properties:

- idle-state : if present, the state that the mux controller will have

  when idle. The special state MUX_IDLE_AS_IS is the default and

  MUX_IDLE_DISCONNECT is also supported.

States 0 through 7 correspond to signals S1 through S8 in the datasheet.

For ADGS1409 only states 0 to 3 are available.

Example:

	/*

	 * One mux controller.

	 * Mux state set to idle as is (no idle-state declared)

	 */

	&spi0 {

		mux: mux-controller@0 {

			compatible = "adi,adgs1408";

			reg = <0>;

			spi-max-frequency = <1000000>;

			#mux-control-cells = <0>;

		};

	}

	adc-mux {

		compatible = "io-channel-mux";

		io-channels = <&adc 1>;

		io-channel-names = "parent";

		mux-controls = <&mux>;

		channels = "out_a0", "out_a1", "test0", "test1",

			"out_b0", "out_b1", "testb0", "testb1";

	};

S:	Maintained

F:	drivers/media/i2c/ad9389b*

ANALOG DEVICES INC ADGS1408 DRIVER

M:	Mircea Caprioru <mircea.caprioru@analog.com>

S:	Supported

F:	drivers/mux/adgs1408.c

F:	Documentation/devicetree/bindings/mux/adgs1408.txt

ANALOG DEVICES INC ADV7180 DRIVER

M:	Lars-Peter Clausen <lars@metafoo.de>

L:	linux-media@vger.kernel.org