ARM: dts: imx28: add alternative pinmuxing for spi3

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

arch/arm/boot/dts/imx28.dtsi

@@ -829,6 +829,19 @@ MX28_PAD_SSP3_SS0__SSP3_D3
 					fsl,pull-up = <MXS_PULL_DISABLE>;
 				};
 
+				spi3_pins_b: spi3@1 {
+					reg = <1>;
+					fsl,pinmux-ids = <
+						MX28_PAD_SSP3_SCK__SSP3_SCK
+						MX28_PAD_SSP3_MOSI__SSP3_CMD
+						MX28_PAD_SSP3_MISO__SSP3_D0
+						MX28_PAD_SSP3_SS0__SSP3_D3
+					>;
+					fsl,drive-strength = <MXS_DRIVE_8mA>;
+					fsl,voltage = <MXS_VOLTAGE_HIGH>;
+					fsl,pull-up = <MXS_PULL_ENABLE>;
+				};
+
 				usb0_pins_a: usb0@0 {
 					reg = <0>;
 					fsl,pinmux-ids = <