arm/dts: Add minimal device tree support for omap2420 and omap2430

Add minimal device tree support for omap2420 and omap2430.

This is needed to keep the uart functional on omap2 after
omap_serial_init is removed from board-generic.c.
Reviewed-by: NRob Herring <rob.herring@calxeda.com>
Signed-off-by: NTony Lindgren <tony@atomide.com>

arch/arm/boot/dts/omap2.dtsi

+/*
+ * Device Tree Source for OMAP2 SoC
+ *
+ * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
+ *
+ * This file is licensed under the terms of the GNU General Public License
+ * version 2.  This program is licensed "as is" without any warranty of any
+ * kind, whether express or implied.
+ */
+
+/include/ "skeleton.dtsi"
+
+/ {
+	compatible = "ti,omap2430", "ti,omap2420", "ti,omap2";
+
+	aliases {
+		serial0 = &uart1;
+		serial1 = &uart2;
+		serial2 = &uart3;
+	};
+
+	cpus {
+		cpu@0 {
+			compatible = "arm,arm1136jf-s";
+		};
+	};
+
+	soc {
+		compatible = "ti,omap-infra";
+		mpu {
+			compatible = "ti,omap2-mpu";
+			ti,hwmods = "mpu";
+		};
+	};
+
+	ocp {
+		compatible = "simple-bus";
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges;
+		ti,hwmods = "l3_main";
+
+		intc: interrupt-controller@1 {
+			compatible = "ti,omap2-intc";
+			interrupt-controller;
+			#interrupt-cells = <1>;
+		};
+
+		uart1: serial@4806a000 {
+			compatible = "ti,omap2-uart";
+			ti,hwmods = "uart1";
+			clock-frequency = <48000000>;
+		};
+
+		uart2: serial@4806c000 {
+			compatible = "ti,omap2-uart";
+			ti,hwmods = "uart2";
+			clock-frequency = <48000000>;
+		};
+
+		uart3: serial@4806e000 {
+			compatible = "ti,omap2-uart";
+			ti,hwmods = "uart3";
+			clock-frequency = <48000000>;
+		};
+	};
+};