imx: arch-mx6: add is_soc_type helper macro

Add helper macro is_soc_type to identify iMX SoC family

Signed-off-by: Adrian Alonso <aalonso@freescale.com>

arch/arm/include/asm/arch-imx/cpu.h

@@ -23,6 +23,8 @@
 #define MXC_CPU_MX6QP		0x69
 #define MXC_CPU_VF610		0xF6 /* dummy ID */
 
+#define MXC_SOC_MX6		0x60
+
 #define CS0_128					0
 #define CS0_64M_CS1_64M				1
 #define CS0_64M_CS1_32M_CS2_32M			2

arch/arm/include/asm/imx-common/sys_proto.h

@@ -17,9 +17,12 @@
 
 /* returns MXC_CPU_ value */
 #define cpu_type(rev) (((rev) >> 12) & 0xff)
+#define soc_type(rev) (((rev) >> 12) & 0xf0)
 /* both macros return/take MXC_CPU_ constants */
 #define get_cpu_type() (cpu_type(get_cpu_rev()))
+#define get_soc_type() (soc_type(get_cpu_rev()))
 #define is_cpu_type(cpu) (get_cpu_type() == cpu)
+#define is_soc_type(soc) (get_soc_type() == soc)
 
 #define is_mx6dqp() (is_cpu_type(MXC_CPU_MX6QP) || is_cpu_type(MXC_CPU_MX6DP))