arm: Add Initial TI-Nspire support

This patch adds support for the TI-Nspire platform.

Changes between v1 and v2:
* Added GENERIC_IRQ_CHIP to platform Kconfig

Signed-off-by: Daniel Tang <dt.tangr@gmail.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
diff --git a/arch/arm/mach-nspire/Kconfig b/arch/arm/mach-nspire/Kconfig
new file mode 100644
index 0000000..59d8f0a
--- /dev/null
+++ b/arch/arm/mach-nspire/Kconfig
@@ -0,0 +1,16 @@
+config ARCH_NSPIRE
+	bool "TI-NSPIRE based"
+	depends on ARCH_MULTI_V4_V5
+	depends on MMU
+	select CPU_ARM926T
+	select COMMON_CLK
+	select GENERIC_CLOCKEVENTS
+	select GENERIC_IRQ_CHIP
+	select SPARSE_IRQ
+	select ARM_AMBA
+	select ARM_VIC
+	select ARM_TIMER_SP804
+	select USE_OF
+	select CLKSRC_OF
+	help
+	  This enables support for systems using the TI-NSPIRE CPU