ARM: DRA7: Add is_dra7xx cpu check definition

A generic is_dra7xx cpu check is useful for grouping
all the revisions under that. This is used in the
subsequent patches.

Signed-off-by: Sricharan R <r.sricharan@ti.com>
diff --git a/arch/arm/include/asm/omap_common.h b/arch/arm/include/asm/omap_common.h
index 8a395e8..0219d6c 100644
--- a/arch/arm/include/asm/omap_common.h
+++ b/arch/arm/include/asm/omap_common.h
@@ -605,6 +605,14 @@
 	extern u32 *const omap_si_rev;
 	return ((*omap_si_rev & 0xFF000000) == OMAP54xx);
 }
+
+#define DRA7XX		0x07000000
+
+static inline u8 is_dra7xx(void)
+{
+	extern u32 *const omap_si_rev;
+	return ((*omap_si_rev & 0xFF000000) == DRA7XX);
+}
 #endif
 
 /*