ARM: DRA7: board-generic: Add basic DT support

Describe minimal DT boot machine details for DRA7xx based SoC's. DRA7xx
family is based on dual core ARM CORTEX A15 using GIC as the interrupt controller.
The PRCM and timer infrastructure is reused from OMAP5 and so are the io
descriptor tables.
Signed-off-by: R Sricharan <r.sricharan@ti.com>
Signed-off-by: Rajendra Nayak <rnayak@ti.com>

Documentation/devicetree/bindings/arm/omap/omap.txt

@@ -59,3 +59,6 @@ Boards:
 
 - AM43x EPOS EVM
   compatible = "ti,am43x-epos-evm", "ti,am4372", "ti,am43"
+
+- DRA7 EVM:  Software Developement Board for DRA7XX
+  compatible = "ti,dra7-evm", "ti,dra7"

arch/arm/mach-omap2/board-generic.c

@@ -222,3 +222,21 @@ DT_MACHINE_START(AM43_DT, "Generic AM43 (Flattened Device Tree)")
 	.dt_compat	= am43_boards_compat,
 MACHINE_END
 #endif
+
+#ifdef CONFIG_SOC_DRA7XX
+static const char *dra7xx_boards_compat[] __initdata = {
+	"ti,dra7",
+	NULL,
+};
+
+DT_MACHINE_START(DRA7XX_DT, "Generic DRA7XX (Flattened Device Tree)")
+	.reserve	= omap_reserve,
+	.smp		= smp_ops(omap4_smp_ops),
+	.map_io		= omap5_map_io,
+	.init_early	= dra7xx_init_early,
+	.init_irq	= omap_gic_of_init,
+	.init_machine	= omap_generic_init,
+	.init_time	= omap5_realtime_timer_init,
+	.dt_compat	= dra7xx_boards_compat,
+MACHINE_END
+#endif