ARM: I2C: Add device tree bindings to i2c-mux-gpio

new file mode 100644
index 0000000..f2bd120
@@ -0,0 +1,86 @@
+GPIO-based I2C Bus Mux
+
+This binding describes an I2C bus multiplexer that uses GPIOs to
+route the I2C signals.
+
+                                 +-----+  +-----+
+                                 | dev |  | dev |
+    +------------------------+   +-----+  +-----+
+    | SoC                    |      |        |
+    |                   /----|------+--------+
+    |   +---+   +------+     | child bus A, on GPIO value set to 0
+    |   |I2C|---| Mux  |     |
+    |   +---+   +--+---+     | child bus B, on GPIO value set to 1
+    |              |    \----|------+--------+--------+
+    |   +------+   |         |      |        |        |
+    |   | GPIO |---+         |  +-----+  +-----+  +-----+
+    |   +------+             |  | dev |  | dev |  | dev |
+    +------------------------+  +-----+  +-----+  +-----+
+
+Required properties:
+- compatible: i2c-mux-gpio
+- i2c-parent: The phandle of the I2C bus that this multiplexer's master-side
+  port is connected to.
+
+Also required are:
+
+- muxer-gpios: list of gpios to use to control the muxer
+
+* Standard I2C mux properties. See mux.txt in this directory.
+
+* I2C child bus nodes. See mux.txt in this directory.
+
+For each i2c child nodes, an I2C child bus will be created. They will
+be numbered based on the reg property of each nodes.
+
+Whenever an access is made to a device on a child bus, the value set
+in the revelant node's reg property will be outputed using the list of
+GPIOs, the first in the list holding the most-significant value.
+
+If an idle state is defined, using the idle-state (optional) property,
+whenever an access is not being made to a device on a child bus, the
+idle value will be programmed into the GPIOs.
+
+If an idle state is not defined, the most recently used value will be
+left programmed into hardware whenever no access is being made of a
+device on a child bus.
+
+Example:
+	i2cmux {
+		compatible = "i2c-mux-gpio";
+		#address-cells = <1>;
+		#size-cells = <0>;
+		muxer-gpios = <&gpio1 22 0 &gpio1 23 0>;
+		i2c-parent = <&i2c1>;
+
+		i2c at 0 {
+			reg = <0>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+		};
+
+		i2c at 1 {
+		      reg = <1>;
+		      #address-cells = <1>;
+		      #size-cells = <0>;
+		};
+
+		i2c at 2 {
+			reg = <2>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+		};
+
+		i2c at 3 {
+			reg = <3>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			pca9555: pca9555 at 20 {
+				compatible = "nxp,pca9555";
+				gpio-controller;
+				#gpio-cells = <2>;
+				reg = <0x20>;
+			};
+		};
+	};

index a9288fb..bd6b938 100644
@@ -76,6 +76,39 @@
 				status = "okay";
 			};
 
+			i2cmux {
+				compatible = "i2c-mux-gpio";
+				#address-cells = <1>;
+				#size-cells = <0>;
+				muxer-gpios = <&gpio1 22 0 &gpio1 23 0>;
+				i2c-parent = <&i2c1>;
+
+				i2c at 0 {
+					reg = <0>;
+					#address-cells = <1>;
+					#size-cells = <0>;
+				};
+
+				i2c at 1 {
+				      reg = <1>;
+				      #address-cells = <1>;
+				      #size-cells = <0>;
+				};
+
+				i2c at 2 {
+					reg = <2>;
+					#address-cells = <1>;
+					#size-cells = <0>;
+				};
+
+				i2c at 3 {
+					reg = <3>;
+					#address-cells = <1>;
+					#size-cells = <0>;
+
+				};
+			};
+
 			usbphy1: usbphy at 8007e000 {
 				status = "okay";
 			};