ARM: dts: OMAP3: Add support for Gumstix Overo with Tobi expansion board

The Gumstix Overo is a computer on module using an OMAP3 processor.
This module must be plugged into an expansion board.

This patch adds a first device tree support for the Overo, using the
Tobi expansion board. The current support is able to boot and mount
the rootfs from MMC.

This patche also updates the omap3 dtb build target.

Currently working:
- mmc0 (on board microSD)
- i2c0 and i2c2 (i2c1 not used)
- led on GPIO
Signed-off-by: Florian Vaussard <florian.vaussard@epfl.ch>
Signed-off-by: Benoit Cousson <b-cousson@ti.com>

arch/arm/boot/dts/omap3-overo.dtsi

+/*
+ * Copyright (C) 2012 Florian Vaussard, EPFL Mobots group
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/*
+ * The Gumstix Overo must be combined with an expansion board.
+ */
+/dts-v1/;
+
+/include/ "omap3.dtsi"
+
+&i2c1 {
+	clock-frequency = <2600000>;
+
+	twl: twl@48 {
+		reg = <0x48>;
+		interrupts = <7>; /* SYS_NIRQ cascaded to intc */
+		interrupt-parent = <&intc>;
+	};
+};
+
+/include/ "twl4030.dtsi"
+
+/* i2c2 pins are used for gpio */
+&i2c2 {
+	status = "disabled";
+};
+
+/* on board microSD slot */
+&mmc1 {
+	vmmc-supply = <&vmmc1>;
+	bus-width = <4>;
+};
+
+/* optional on board WiFi */
+&mmc2 {
+	bus-width = <4>;
+};

arch/arm/boot/dts/omap3-tobi.dts

+/*
+ * Copyright (C) 2012 Florian Vaussard, EPFL Mobots group
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/*
+ * Tobi expansion board is manufactured by Gumstix Inc.
+ */
+
+/include/ "omap3-overo.dtsi"
+
+/ {
+	model = "TI OMAP3 Gumstix Overo on Tobi";
+	compatible = "ti,omap3-tobi", "ti,omap3-overo", "ti,omap3";
+
+	leds {
+		compatible = "gpio-leds";
+		heartbeat {
+			label = "overo:red:gpio21";
+			gpios = <&gpio1 21 0>;
+			linux,default-trigger = "heartbeat";
+		};
+	};
+};
+
+&i2c3 {
+	clock-frequency = <100000>;
+};
+
+&mmc3 {
+	status = "disabled";
+};

arch/arm/mach-omap2/Makefile.boot

@@ -3,7 +3,7 @@ params_phys-y		:= 0x80000100
 initrd_phys-y		:= 0x80800000
 
 dtb-$(CONFIG_SOC_OMAP2420)	+= omap2420-h4.dtb
-dtb-$(CONFIG_ARCH_OMAP3)	+= omap3-beagle.dtb omap3-evm.dtb
+dtb-$(CONFIG_ARCH_OMAP3)	+= omap3-beagle.dtb omap3-evm.dtb omap3-tobi.dtb
 dtb-$(CONFIG_ARCH_OMAP4)	+= omap4-panda.dtb omap4-pandaES.dtb
 dtb-$(CONFIG_ARCH_OMAP4)	+= omap4-var_som.dtb omap4-sdp.dtb
 dtb-$(CONFIG_SOC_OMAP5)		+= omap5-evm.dtb