Analog Devices ADG792A/G is a triple 4:1 mux.
Signed-off-by: Peter Rosin <peda@xxxxxxxxxx>
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.../devicetree/bindings/mux/mux-adg792a.txt | 79 ++++++++++++++++++++++
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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 for ADG792G:
+- gpio-controller : if present, #gpio-cells below is required.
+- #gpio-cells : should be <2>
+ - First cell is the GPO line number, i.e. 0 or 1
+ - Second cell is used to specify active high (0)
+ or active low (1)
+
+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 2-tuples with mux controller number
+ and state that mux controllers will have when idle. States 0 through 3
+ correspond to signals A through D in the datasheet.
+- adi,idle-high-impedance : if present, array of mux controller numbers that
+ should be in the disconnected high-impedance state when idle.
+
+Mux controller states 0 through 3 correspond to signals A through D in the
+datasheet. If a mux controller is mentioned in neither adi,idle-state nor
+adi,idle-high-impedance it is left in its previously selected state when idle.
+
+Example:
+
+ /*
+ * Three independent mux controllers (of which one is used).
+ * Mux 0 is disconnected when idle, mux 1 idles with signal C
+ * and mux 2 idles with signal A.
+ */
+ &i2c0 {
+ mux: adg792a@50 {
+ compatible = "adi,adg792a";
+ reg = <0x50>;
+ #mux-control-cells = <1>;
+
+ adi,idle-high-impedance = <0>;
+ adi,idle-state = <1 2>, <2 0>;
+ };
+ };
+
+ adc-mux {
+ compatible = "io-channel-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 = "io-channel-mux";
+ io-channels = <&adc 0>;
+ io-channel-names = "parent";
+
+ mux-controls = <&pmux>;
+
+ channels = "sync-1", "", "out";
+ };
--
2.1.4
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