ARM: dts: imx28: add alternative pinmuxing for i2c1

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Shawn Guo <shawn.guo@freescale.com>

arch/arm/boot/dts/imx28.dtsi

@@ -585,6 +585,17 @@ MX28_PAD_PWM1__I2C1_SDA
 					fsl,pull-up = <MXS_PULL_ENABLE>;
 				};
 
+				i2c1_pins_b: i2c1@1 {
+					reg = <1>;
+					fsl,pinmux-ids = <
+						MX28_PAD_AUART2_CTS__I2C1_SCL
+						MX28_PAD_AUART2_RTS__I2C1_SDA
+					>;
+					fsl,drive-strength = <MXS_DRIVE_8mA>;
+					fsl,voltage = <MXS_VOLTAGE_HIGH>;
+					fsl,pull-up = <MXS_PULL_ENABLE>;
+				};
+
 				saif0_pins_a: saif0@0 {
 					reg = <0>;
 					fsl,pinmux-ids = <