arm/imx6: add imx6q sabrelite board support

- Add basic board dts file
- Add board compatible string to mach-imx6q.
- Update fsl DT board doc.
Signed-off-by: Richard Zhao <richard.zhao@linaro.org>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>

Documentation/devicetree/bindings/arm/fsl.txt

@@ -24,3 +24,7 @@ Required root node properties:
 i.MX6 Quad SABRE Automotive Board
 Required root node properties:
     - compatible = "fsl,imx6q-sabreauto", "fsl,imx6q";
+
+i.MX6 Quad SABRE Lite Board
+Required root node properties:
+    - compatible = "fsl,imx6q-sabrelite", "fsl,imx6q";

arch/arm/boot/dts/imx6q-sabrelite.dts

+/*
+ * Copyright 2011 Freescale Semiconductor, Inc.
+ * Copyright 2011 Linaro Ltd.
+ *
+ * The code contained herein is licensed under the GNU General Public
+ * License. You may obtain a copy of the GNU General Public License
+ * Version 2 or later at the following locations:
+ *
+ * http://www.opensource.org/licenses/gpl-license.html
+ * http://www.gnu.org/copyleft/gpl.html
+ */
+
+/dts-v1/;
+/include/ "imx6q.dtsi"
+
+/ {
+	model = "Freescale i.MX6 Quad SABRE Lite Board";
+	compatible = "fsl,imx6q-sabrelite", "fsl,imx6q";
+
+	memory {
+		reg = <0x10000000 0x40000000>;
+	};
+
+	soc {
+		aips-bus@02100000 { /* AIPS2 */
+			enet@02188000 {
+				phy-mode = "rgmii";
+				phy-reset-gpios = <&gpio3 23 0>;
+				status = "okay";
+			};
+
+			usdhc@02198000 { /* uSDHC3 */
+				cd-gpios = <&gpio7 0 0>;
+				wp-gpios = <&gpio7 1 0>;
+				status = "okay";
+			};
+
+			usdhc@0219c000 { /* uSDHC4 */
+				cd-gpios = <&gpio2 6 0>;
+				wp-gpios = <&gpio2 7 0>;
+				status = "okay";
+			};
+
+			uart2: uart@021e8000 {
+				status = "okay";
+			};
+		};
+	};
+};

arch/arm/mach-imx/mach-imx6q.c

@@ -73,6 +73,7 @@ static struct sys_timer imx6q_timer = {
 
 static const char *imx6q_dt_compat[] __initdata = {
 	"fsl,imx6q-sabreauto",
+	"fsl,imx6q-sabrelite",
 	NULL,
 };