ARM: i.MX31: Add GPT devicetree node

The GPT is the GPT timer found on i.MX SoCs.

Since this is the first user of the AIPS2 this patch also adds it.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>

arch/arm/boot/dts/imx31.dtsi

@@ -101,5 +101,21 @@ clks: ccm@53f80000{
 				#clock-cells = <1>;
 			};
 		};
+
+		aips@53f00000 { /* AIPS2 */
+			compatible = "fsl,aips-bus", "simple-bus";
+			#address-cells = <1>;
+			#size-cells = <1>;
+			reg = <0x53f00000 0x100000>;
+			ranges;
+
+			gpt: timer@53f90000 {
+				compatible = "fsl,imx31-gpt";
+				reg = <0x53f90000 0x4000>;
+				interrupts = <29>;
+				clocks = <&clks 10>, <&clks 22>;
+				clock-names = "ipg", "per";
+			};
+		};
 	};
 };