ARM: mx28evk: Add SPI flash support

mx28evk has a free slot (J89) which can be used to populate an SPI NOR Flash.

Add support for it.
Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>

arch/arm/boot/dts/imx28-evk.dts

@@ -46,6 +46,23 @@ ssp1: ssp@80012000 {
 				wp-gpios = <&gpio0 28 0>;
 			};
 
+			ssp2: ssp@80014000 {
+				#address-cells = <1>;
+				#size-cells = <0>;
+				compatible = "fsl,imx28-spi";
+				pinctrl-names = "default";
+				pinctrl-0 = <&spi2_pins_a>;
+				status = "okay";
+
+				flash: m25p80@0 {
+					#address-cells = <1>;
+					#size-cells = <1>;
+					compatible = "sst,sst25vf016b";
+					spi-max-frequency = <40000000>;
+					reg = <0>;
+				};
+			};
+
 			pinctrl@80018000 {
 				pinctrl-names = "default";
 				pinctrl-0 = <&hog_pins_a>;