ARM: dts: cm-t335: add basic support for I2C

Add pinmux configuration for I2C0 and I2C1 pins.
Add description for I2C0 bus, set clock frequency to 400kHz.
Add child nodes for 24c02 EEPROM and em3027 RTC on I2C0 bus.
Signed-off-by: NIlya Ledvich <ilya@compulab.co.il>
Signed-off-by: NUri Mashiach <uri.mashiach@compulab.co.il>
Acked-by: NIgor Grinberg <grinberg@compulab.co.il>
Signed-off-by: NTony Lindgren <tony@atomide.com>

arch/arm/boot/dts/am335x-cm-t335.dts

@@ -37,6 +37,24 @@
 	pinctrl-names = "default";
 	pinctrl-0 = <>;
 
+	i2c0_pins: pinmux_i2c0_pins {
+		pinctrl-single,pins = <
+			/* i2c0_sda.i2c0_sda */
+			AM33XX_IOPAD(0x988, PIN_INPUT_PULLUP | MUX_MODE0)
+			/* i2c0_scl.i2c0_scl */
+			AM33XX_IOPAD(0x98c, PIN_INPUT_PULLUP | MUX_MODE0)
+		>;
+	};
+
+	i2c1_pins: pinmux_i2c1_pins {
+		pinctrl-single,pins = <
+			/* uart0_ctsn.i2c1_sda */
+			AM33XX_IOPAD(0x968, PIN_INPUT_PULLUP | MUX_MODE2)
+			/* uart0_rtsn.i2c1_scl */
+			AM33XX_IOPAD(0x96c, PIN_INPUT_PULLUP | MUX_MODE2)
+		>;
+	};
+
 	gpio_led_pins: pinmux_gpio_led_pins {
 		pinctrl-single,pins = <
 			/* gpmc_csn3.gpio2_0 */
@@ -60,3 +78,22 @@
 
 	status = "okay";
 };
+
+&i2c0 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&i2c0_pins>;
+
+	status = "okay";
+	clock-frequency = <400000>;
+	/* CM-T335 board EEPROM */
+	eeprom: 24c02@50 {
+		compatible = "atmel,24c02";
+		reg = <0x50>;
+		pagesize = <16>;
+	};
+	/* Real Time Clock */
+	ext_rtc: em3027@56 {
+		compatible = "emmicro,em3027";
+		reg = <0x56>;
+	};
+};