dt-bindings: add eusb i2c repeater

This add description for third party i2c repeater.

Change-Id: I817661157b3262c5014fbbb791940e4e969d81f7

bindings/usb/eusb2-i2c-repeater.txt

@@ -0,0 +1,27 @@
+eUSB2 i2c Repeater
+
+Required properties:
+ - compatible: should be one of the following -
+	"nxp,eusb2-repeater": for NXP eUSB2 repeater
+	"ti,eusb2-repeater": for TI eUSB2 repeater
+ - reg: Address and length of the register set for the device
+ - <supply-name>-supply: phandle to the regulator device tree node
+   Required "supply-name" examples are:
+	"vdd3" : 3.v supply for eUSB2 repeater
+	"vdd18" : 1.8v supply for eUSB2 repeater
+ - reset-gpio: A phandle and gpio specifier denoting the GPIO connected
+        to the RESET pin of the eUSB2 repeater.
+
+Optional properties:
+ - qcom,param-override-seq: parameter override sequence with value, reg offset
+   pair.
+
+Example:
+	eusb2_repeater@fd00 {
+		compatible = "nxp,eusb2-repeater";
+		reg = <0xfd00 0xff>;
+		vdd18-supply = <&pm8841_s2_corner>;
+		vdd3-supply = <&pm8941_l6>;
+		qcom,param-override-seq = <0x4 0x57>;
+		reset-gpio = <&pm8350_gpios 6 GPIO_ACTIVE_LOW>;
+	};