ARM: dts: imx51: add capture-subsystem device

Add IPU CSI ports and capture-subsystem device so the capture subsystem
part of the IPUv3EX can be used with the staging imx-media driver.
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx51.dtsi

@@ -104,6 +104,11 @@ usbphy0: usbphy0 {
 		#phy-cells = <0>;
 	};
 
+	capture-subsystem {
+		compatible = "fsl,imx-capture-subsystem";
+		ports = <&ipu_csi0>, <&ipu_csi1>;
+	};
+
 	display-subsystem {
 		compatible = "fsl,imx-display-subsystem";
 		ports = <&ipu_di0>, <&ipu_di1>;
@@ -143,6 +148,14 @@ ipu: ipu@40000000 {
 			clock-names = "bus", "di0", "di1";
 			resets = <&src 2>;
 
+			ipu_csi0: port@0 {
+				reg = <0>;
+			};
+
+			ipu_csi1: port@1 {
+				reg = <1>;
+			};
+
 			ipu_di0: port@2 {
 				reg = <2>;