[PATCH v6 8/9] dt-bindings: mux-adg792a: document devicetree bindings for ADG792A/G mux

[Peter Rosin <peda-koto5C5qi+TLoDKTGw+V6w@public.gmane.org>]

Analog Devices ADG792A/G is a triple 4:1 mux.

Signed-off-by: Peter Rosin <peda-koto5C5qi+TLoDKTGw+V6w@public.gmane.org>
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+Bindings for Analog Devices ADG792A/G Triple 4:1 Multiplexers
+
+Required properties:
+- compatible : "adi,adg792a" or "adi,adg792g"
+- #mux-control-cells : <0> if parallel, or <1> if not.
+* Standard mux-controller bindings as decribed in mux-controller.txt
+
+Optional properties:
+- adi,parallel : if present, the three muxes are bound together with a single
+  mux controller, controlling all three muxes in parallel.
+- adi,idle-state : if present, array of states the three mux controllers will
+  have when idle (or, if parallel, a single idle-state).
+
+Mux controller states 0 through 3 correspond to signals A through D in the
+datasheet. Mux controller states 4 and 5 are only available as possible idle
+states. State 4 represents that nothing is connected, and state 5 represents
+that the mux controller keeps the mux in its previously selected state during
+the idle period. State 5 is the default idle state.
+
+Example:
+
+	/* three independent mux controllers (of which one is used) */
+	&i2c0 {
+		mux: adg792a@50 {
+			compatible = "adi,adg792a";
+			reg = <0x50>;
+			#mux-control-cells = <1>;
+		};
+	};
+
+	adc-mux {
+		compatible = "iio-mux";
+		io-channels = <&adc 0>;
+		io-channel-names = "parent";
+
+		mux-controls = <&mux 1>;
+
+		channels = "sync-1", "", "out";
+	};
+
+
+	/*
+	 * Three parallel muxes with one mux controller, useful e.g. if
+	 * the adc is differential, thus needing two signals to be muxed
+	 * simultaneously for correct operation.
+	 */
+	&i2c0 {
+		pmux: adg792a@50 {
+			compatible = "adi,adg792a";
+			reg = <0x50>;
+			#mux-control-cells = <0>;
+			adi,parallel;
+		};
+	};
+
+	diff-adc-mux {
+		compatible = "iio-mux";
+		io-channels = <&adc 0>;
+		io-channel-names = "parent";
+
+		mux-controls = <&pmux>;
+
+		channels = "sync-1", "", "out";
+	};
-- 
2.1.4

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