arm: exynos: realign the code to allow support for newer 64-bit platforms

The existing Exynos 32-bit platform support needs to be realigned in
order to support newer 64-bit Exynos platforms. The driver model will
be utlized for drivers on the 64-bit Exynos platforms and so some of
the older platform support code would not be required for the newer
64-bit Exynos platforms.

Cc: Minkyu Kang <mk7.kang@samsung.com>
Signed-off-by: Thomas Abraham <thomas.ab@samsung.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
diff --git a/arch/arm/mach-exynos/Kconfig b/arch/arm/mach-exynos/Kconfig
index a6a7597..28a6a60 100644
--- a/arch/arm/mach-exynos/Kconfig
+++ b/arch/arm/mach-exynos/Kconfig
@@ -1,9 +1,32 @@
 if ARCH_EXYNOS
 
 choice
-	prompt "EXYNOS board select"
+	prompt "EXYNOS architecture type select"
 	optional
 
+config ARCH_EXYNOS4
+	bool "Exynos4 SoC family"
+	select CPU_V7
+	help
+	  Samsung Exynos4 SoC family are based on ARM Cortex-A9 CPU. There
+	  are multiple SoCs in this family including Exynos4210, Exynos4412,
+	  and Exynos4212.
+
+config ARCH_EXYNOS5
+	bool "Exynos5 SoC family"
+	select CPU_V7
+	help
+	  Samsung Exynos5 SoC family are based on ARM Cortex-A15 CPU (and
+	  Cortex-A7 CPU in big.LITTLE configuration). There are multiple SoCs
+	  in this family including Exynos5250, Exynos5420 and Exynos5800.
+
+endchoice
+
+if ARCH_EXYNOS4
+
+choice
+	prompt "EXYNOS4 board select"
+
 config TARGET_SMDKV310
 	select SUPPORT_SPL
 	bool "Exynos4210 SMDKV310 board"
@@ -25,6 +48,14 @@
 config TARGET_ODROID
 	bool "Exynos4412 Odroid board"
 
+endchoice
+endif
+
+if ARCH_EXYNOS5
+
+choice
+	prompt "EXYNOS5 board select"
+
 config TARGET_ODROID_XU3
 	bool "Exynos5422 Odroid board"
 	select OF_CONTROL
@@ -68,6 +99,7 @@
 	select OF_CONTROL
 
 endchoice
+endif
 
 config SYS_SOC
 	default "exynos"