dm: select CONFIG_DM* options

As mentioned in the previous commit, adding default values in each
Kconfig causes problems because it does not co-exist with the
"depends on" syntax.  (Please note this is not a bug of Kconfig.)
We should not do so unless we have a special reason.  Actually,
for CONFIG_DM*, we have no good reason to do so.

Generally, CONFIG_DM is not a user-configurable option.  Once we
convert a driver into Driver Model, the board only works with Driver
Model, i.e. CONFIG_DM must be always enabled for that board.
So, using "select DM" is more suitable rather than allowing users to
modify it.  Another good thing is, Kconfig warns unmet dependencies
for "select" syntax, so we easily notice bugs.

Actually, CONFIG_DM and other related options have been added
without consistency: some into arch/*/Kconfig, some into
board/*/Kconfig, and some into configs/*_defconfig.

This commit prefers "select" and cleans up the following issues.

[1] Never use "CONFIG_DM=n" in defconfig files

It is really rare to add "CONFIG_FOO=n" to disable CONFIG options.
It is more common to use "# CONFIG_FOO is not set".  But here, we
do not even have to do it.
Less than half of OMAP3 boards have been converted to Driver Model.
Adding the default values to arch/arm/cpu/armv7/omap3/Kconfig is
weird.  Instead, add "select DM" only to appropriate boards, which
eventually eliminates "CONFIG_DM=n", etc.

[2] Delete redundant CONFIGs

Sandbox sets CONFIG_DM in arch/sandbox/Kconfig and defines it again
in configs/sandbox_defconfig.
Likewise, OMAP3 sets CONFIG_DM arch/arm/cpu/armv7/omap3/Kconfig and
defines it also in omap3_beagle_defconfig and devkit8000_defconfig.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

9 files changed, 64 insertions, 81 deletions

diff --git a/arch/Kconfig b/arch/Kconfig
index 2ca530525e0..11023462200 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -70,6 +70,12 @@ config SANDBOX
 	select HAVE_GENERIC_BOARD
 	select SYS_GENERIC_BOARD
 	select SUPPORT_OF_CONTROL
+	select DM
+	select DM_SPI_FLASH
+	select DM_SERIAL
+	select DM_I2C
+	select DM_SPI
+	select DM_GPIO
 
 config SH
 	bool "SuperH architecture"
@@ -84,6 +90,9 @@ config X86
 	select HAVE_GENERIC_BOARD
 	select SYS_GENERIC_BOARD
 	select SUPPORT_OF_CONTROL
+	select DM
+	select DM_SERIAL
+	select DM_GPIO
 
 endchoice
 
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 7ed0e205210..afd770c7dbd 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -293,6 +293,9 @@ config TARGET_MX35PDK
 
 config ARCH_BCM283X
 	bool "Broadcom BCM283X family"
+	select DM
+	select DM_SERIAL
+	select DM_GPIO
 
 config TARGET_INTEGRATORAP_CM946ES
 	bool "Support integratorap_cm946es"
@@ -330,21 +333,33 @@ config TARGET_CM_T335
 	bool "Support cm_t335"
 	select CPU_V7
 	select SUPPORT_SPL
+	select DM
+	select DM_SERIAL
+	select DM_GPIO
 
 config TARGET_PEPPER
 	bool "Support pepper"
 	select CPU_V7
 	select SUPPORT_SPL
+	select DM
+	select DM_SERIAL
+	select DM_GPIO
 
 config TARGET_AM335X_IGEP0033
 	bool "Support am335x_igep0033"
 	select CPU_V7
 	select SUPPORT_SPL
+	select DM
+	select DM_SERIAL
+	select DM_GPIO
 
 config TARGET_PCM051
 	bool "Support pcm051"
 	select CPU_V7
 	select SUPPORT_SPL
+	select DM
+	select DM_SERIAL
+	select DM_GPIO
 
 config TARGET_DRACO
 	bool "Support draco"
@@ -370,11 +385,17 @@ config TARGET_PENGWYN
 	bool "Support pengwyn"
 	select CPU_V7
 	select SUPPORT_SPL
+	select DM
+	select DM_SERIAL
+	select DM_GPIO
 
 config TARGET_AM335X_EVM
 	bool "Support am335x_evm"
 	select CPU_V7
 	select SUPPORT_SPL
+	select DM
+	select DM_SERIAL
+	select DM_GPIO
 
 config TARGET_AM43XX_EVM
 	bool "Support am43xx_evm"
@@ -419,10 +440,18 @@ config TARGET_BCMNSP
 config ARCH_EXYNOS
 	bool "Samsung EXYNOS"
 	select CPU_V7
+	select DM
+	select DM_SPI_FLASH
+	select DM_SERIAL
+	select DM_SPI
+	select DM_GPIO
 
 config ARCH_S5PC1XX
 	bool "Samsung S5PC1XX"
 	select CPU_V7
+	select DM
+	select DM_SERIAL
+	select DM_GPIO
 
 config ARCH_HIGHBANK
 	bool "Calxeda Highbank"
@@ -632,6 +661,12 @@ config TEGRA
 	select SPL
 	select OF_CONTROL
 	select CPU_V7
+	select DM
+	select DM_SPI_FLASH
+	select DM_SERIAL
+	select DM_I2C
+	select DM_SPI
+	select DM_GPIO
 
 config TARGET_VEXPRESS64_AEMV8A
 	bool "Support vexpress_aemv8a"
diff --git a/arch/arm/cpu/armv7/exynos/Kconfig b/arch/arm/cpu/armv7/exynos/Kconfig
index 338a7452762..f6084ac4769 100644
--- a/arch/arm/cpu/armv7/exynos/Kconfig
+++ b/arch/arm/cpu/armv7/exynos/Kconfig
@@ -65,21 +65,6 @@ endchoice
 config SYS_SOC
 	default "exynos"
 
-config DM
-	default y
-
-config DM_SERIAL
-	default y
-
-config DM_SPI
-	default y
-
-config DM_SPI_FLASH
-	default y
-
-config DM_GPIO
-	default y
-
 config DM_USB
 	default y
 
diff --git a/arch/arm/cpu/armv7/omap3/Kconfig b/arch/arm/cpu/armv7/omap3/Kconfig
index 1f96498fb87..cc82c5000e7 100644
--- a/arch/arm/cpu/armv7/omap3/Kconfig
+++ b/arch/arm/cpu/armv7/omap3/Kconfig
@@ -17,6 +17,9 @@ config TARGET_OMAP3_SDP3430
 config TARGET_OMAP3_BEAGLE
 	bool "TI OMAP3 BeagleBoard"
 	select SUPPORT_SPL
+	select DM
+	select DM_SERIAL
+	select DM_GPIO
 
 config TARGET_CM_T35
 	bool "CompuLab CM-T3530 and CM-T3730 boards"
@@ -28,6 +31,9 @@ config TARGET_CM_T3517
 config TARGET_DEVKIT8000
 	bool "TimLL OMAP3 Devkit8000"
 	select SUPPORT_SPL
+	select DM
+	select DM_SERIAL
+	select DM_GPIO
 
 config TARGET_OMAP3_EVM
 	bool "TI OMAP3 EVM"
@@ -44,13 +50,22 @@ config TARGET_OMAP3_EVM_QUICK_NAND
 config TARGET_OMAP3_IGEP00X0
 	bool "IGEP"
 	select SUPPORT_SPL
+	select DM
+	select DM_SERIAL
+	select DM_GPIO
 
 config TARGET_OMAP3_OVERO
 	bool "OMAP35xx Gumstix Overo"
 	select SUPPORT_SPL
+	select DM
+	select DM_SERIAL
+	select DM_GPIO
 
 config TARGET_OMAP3_ZOOM1
 	bool "TI Zoom1"
+	select DM
+	select DM_SERIAL
+	select DM_GPIO
 
 config TARGET_AM3517_CRANE
 	bool "am3517_crane"
@@ -94,18 +109,12 @@ config TARGET_TWISTER
 config TARGET_OMAP3_CAIRO
 	bool "QUIPOS CAIRO"
 	select SUPPORT_SPL
+	select DM
+	select DM_SERIAL
+	select DM_GPIO
 
 endchoice
 
-config DM
-	default y
-
-config DM_GPIO
-	default y if DM
-
-config DM_SERIAL
-	default y if DM
-
 config SYS_SOC
 	default "omap3"
 
diff --git a/arch/arm/mach-bcm283x/Kconfig b/arch/arm/mach-bcm283x/Kconfig
index 0c04c301b23..c740180e68d 100644
--- a/arch/arm/mach-bcm283x/Kconfig
+++ b/arch/arm/mach-bcm283x/Kconfig
@@ -14,15 +14,6 @@ config TARGET_RPI_2
 
 endchoice
 
-config DM
-	default y
-
-config DM_SERIAL
-	default y
-
-config DM_GPIO
-	default y
-
 config PHYS_TO_BUS
 	default y
 
diff --git a/arch/arm/mach-tegra/Kconfig b/arch/arm/mach-tegra/Kconfig
index fce1c1dc878..8bab594f49e 100644
--- a/arch/arm/mach-tegra/Kconfig
+++ b/arch/arm/mach-tegra/Kconfig
@@ -23,27 +23,9 @@ config SYS_MALLOC_F_LEN
 config USE_PRIVATE_LIBGCC
 	default y
 
-config DM
-	default y
-
 config SPL_DM
 	default y
 
-config DM_SERIAL
-	default y
-
-config DM_SPI
-	default y
-
-config DM_SPI_FLASH
-	default y
-
-config DM_I2C
-	default y
-
-config DM_GPIO
-	default y
-
 source "arch/arm/mach-tegra/tegra20/Kconfig"
 source "arch/arm/mach-tegra/tegra30/Kconfig"
 source "arch/arm/mach-tegra/tegra114/Kconfig"
diff --git a/arch/powerpc/cpu/ppc4xx/Kconfig b/arch/powerpc/cpu/ppc4xx/Kconfig
index 9e52d3f22dc..89cb3e9c4ee 100644
--- a/arch/powerpc/cpu/ppc4xx/Kconfig
+++ b/arch/powerpc/cpu/ppc4xx/Kconfig
@@ -43,6 +43,8 @@ config TARGET_BUBINGA
 
 config TARGET_CANYONLANDS
 	bool "Support canyonlands"
+	select DM
+	select DM_SERIAL
 
 config TARGET_EBONY
 	bool "Support ebony"
diff --git a/arch/sandbox/Kconfig b/arch/sandbox/Kconfig
index e1832c931db..8aac96f8d92 100644
--- a/arch/sandbox/Kconfig
+++ b/arch/sandbox/Kconfig
@@ -10,24 +10,6 @@ config SYS_BOARD
 config SYS_CONFIG_NAME
 	default "sandbox"
 
-config DM
-	default y
-
-config DM_GPIO
-	default y
-
-config DM_SERIAL
-	default y
-
-config DM_SPI
-	default y
-
-config DM_SPI_FLASH
-	default y
-
-config DM_I2C
-	default y
-
 config DM_TEST
 	default y
 
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index b67a89928f6..6cff14a0ca8 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -81,18 +81,6 @@ config TARGET_GALILEO
 
 endchoice
 
-config DM
-	default y
-
-config DM_GPIO
-	default y
-
-config DM_SERIAL
-	default y
-
-config DM_SERIAL
- 	default y
-
 config DM_SPI
 	default y