ARM: uniphier: allow to enable multiple SoCs

Before this commit, the Kconfig menu in mach-uniphier only allowed us
to choose one SoC to be compiled.  Each SoC has its own defconfig file
for the build-test coverage.  Consequently, some defconfig files are
duplicated with only the difference in CONFIG_DEFAULT_DEVICE_TREE and
CONFIG_{SOC_NAME}=y.

Now, most of board-specific parameters have been moved to device trees,
so it makes sense to include init code of multiple SoCs into a single
image as long as the SoCs have similar architecture.  In fact, some
SoCs of UniPhier family are very similar:
 - PH1-LD4 and PH1-sLD8
 - PH1-LD6b and ProXstream2 (will be added in the upcoming commit)

This commit will be helpful to merge some defconfig files for better
maintainability.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/arch/arm/mach-uniphier/Kconfig b/arch/arm/mach-uniphier/Kconfig
index d7a19c6..2cc5dac 100644
--- a/arch/arm/mach-uniphier/Kconfig
+++ b/arch/arm/mach-uniphier/Kconfig
@@ -6,25 +6,32 @@
 config UNIPHIER_SMP
 	bool
 
-choice
-	prompt "UniPhier SoC select"
-	default ARCH_UNIPHIER_PH1_PRO4
-
 config ARCH_UNIPHIER_PH1_SLD3
-	bool "PH1-sLD3"
+	bool "UniPhier PH1-sLD3 SoC"
 	select UNIPHIER_SMP
+	help
+	  This enables support for UniPhier PH1-sLD3 SoC.
 
 config ARCH_UNIPHIER_PH1_LD4
-	bool "PH1-LD4"
+	bool "UniPhier PH1-LD4 SoC"
+	depends on !ARCH_UNIPHIER_PH1_SLD3
+	help
+	  This enables support for UniPhier PH1-LD4 SoC.
 
 config ARCH_UNIPHIER_PH1_PRO4
-	bool "PH1-Pro4"
+	bool "UniPhier PH1-Pro4 SoC"
 	select UNIPHIER_SMP
+	depends on !ARCH_UNIPHIER_PH1_SLD3 && \
+		   !ARCH_UNIPHIER_PH1_LD4 && \
+		   !ARCH_UNIPHIER_PH1_SLD8
+	help
+	  This enables support for UniPhier PH1-Pro4 SoC.
 
 config ARCH_UNIPHIER_PH1_SLD8
-	bool "PH1-sLD8"
-
-endchoice
+	bool "UniPhier PH1-sLD8 SoC"
+	depends on !ARCH_UNIPHIER_PH1_SLD3
+	help
+	  This enables support for UniPhier PH1-sLD8 SoC.
 
 config MICRO_SUPPORT_CARD
 	bool "Use Micro Support Card"
@@ -48,22 +55,4 @@
 	  The command "ddrphy" shows the resulting parameters of DDR PHY
 	  training; it is useful for the evaluation of DDR PHY training.
 
-choice
-	prompt "DDR3 Frequency select"
-
-config DDR_FREQ_1600
-	bool "DDR3 1600"
-	depends on ARCH_UNIPHIER_PH1_SLD3 || ARCH_UNIPHIER_PH1_LD4 || ARCH_UNIPHIER_PH1_PRO4
-
-config DDR_FREQ_1333
-	bool "DDR3 1333"
-	depends on ARCH_UNIPHIER_PH1_SLD3 || ARCH_UNIPHIER_PH1_LD4 || ARCH_UNIPHIER_PH1_SLD8
-
-endchoice
-
-config DDR_FREQ
-	int
-	default 1333 if DDR_FREQ_1333
-	default 1600 if DDR_FREQ_1600
-
 endif