imx: vf610 add get_cpu_rev

Since we need to support runtime check for different drivers, we need
to add get_cpu_rev for vf610, otherwise there will be build errors.

This patch introduces a dummy CPU id which is not read from chip
silicon. Later when we can get the real id from chip, can fix the
value of MXC_CPU_VF610 then.

Signed-off-by: Peng Fan <Peng.Fan@freescale.com>
Suggested-by: Stefano Babic <sbabic@denx.de>
Cc: Stefano Babic <sbabic@denx.de>
Acked-by: Stefano Babic <sbabic@denx.de>

arch/arm/cpu/armv7/vf610/generic.c

@@ -9,6 +9,7 @@
 #include <asm/arch/imx-regs.h>
 #include <asm/arch/clock.h>
 #include <asm/arch/crm_regs.h>
+#include <asm/imx-common/sys_proto.h>
 #include <netdev.h>
 #ifdef CONFIG_FSL_ESDHC
 #include <fsl_esdhc.h>
@@ -266,6 +267,11 @@ void imx_get_mac_from_fuse(int dev_id, unsigned char *mac)
 }
 #endif
 
+u32 get_cpu_rev(void)
+{
+	return MXC_CPU_VF610 << 12;
+}
+
 #if defined(CONFIG_DISPLAY_CPUINFO)
 static char *get_reset_cause(void)
 {

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

@@ -21,6 +21,7 @@
 #define MXC_CPU_MX6D		0x67
 #define MXC_CPU_MX6DP		0x68
 #define MXC_CPU_MX6QP		0x69
+#define MXC_CPU_VF610		0xF6 /* dummy ID */
 
 #define CS0_128					0
 #define CS0_64M_CS1_64M				1