MIPS: dts: mscc: Add i2c on ocelot

Ocelot has an i2c controller, add it. There is only one possible pinmux
configuration so add it as well.

Signed-off-by: Alexandre Belloni <[e-mail]>
Signed-off-by: Paul Burton <[e-mail]>
Patchwork: https://patchwork.linux-mips.org/patch/20353/
Cc: Wolfram Sang <[e-mail]>
Cc: Jarkko Nikula <[e-mail]>
Cc: James Hogan <[e-mail]>
Cc: Andy Shevchenko <[e-mail]>
Cc: Mika Westerberg <[e-mail]>
Cc: [e-mail]
Cc: [e-mail]
Cc: [e-mail]
Cc: [e-mail]
Cc: Thomas Petazzoni <[e-mail]>
Cc: Allan Nielsen <[e-mail]>

arch/mips/boot/dts/mscc/ocelot.dtsi

···
 			status = "disabled";
 		};
 
+		i2c: i2c@100400 {
+			compatible = "mscc,ocelot-i2c", "snps,designware-i2c";
+			pinctrl-0 = <&i2c_pins>;
+			pinctrl-names = "default";
+			reg = <0x100400 0x100>, <0x198 0x8>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+			interrupts = <8>;
+			clocks = <&ahb_clk>;
+
+			status = "disabled";
+		};
+
 		uart2: serial@100800 {
 			pinctrl-0 = <&uart2_pins>;
 			pinctrl-names = "default";
···
 			interrupts = <13>;
 			#interrupt-cells = <2>;
 
+			i2c_pins: i2c-pins {
+				pins = "GPIO_16", "GPIO_17";
+				function = "twi";
+			};
+
 			uart_pins: uart-pins {
 				pins = "GPIO_6", "GPIO_7";
 				function = "uart";
···
 				pins = "GPIO_14", "GPIO_15";
 				function = "miim1";
 			};
+
 		};
 
 		mdio0: mdio@107009c {