of: Put all CONFIG_OF dependencies into a Kconfig menu block

All of the options in drivers/of/Kconfig depend on CONFIG_OF.  Putting
all of them inside a menu block simplifies the dependency statements.
It also creates a logical group for adding user selectable OF options.

This patch also changes (PPC_OF || MICROBLAZE) statements to (!SPARC)
so that those options are available to other architectures (and in
fact the !SPARC conditions should probably be re-evalutated since the
code is more generic now)

This patch also moves the definition of CONFIG_DTC from arch/* to
drivers/of/Kconfig

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

drivers/of/Kconfig

@@ -1,46 +1,53 @@
+config DTC
+	bool
+
 config OF
 	bool
 
+menu "Flattened Device Tree and Open Firmware support"
+	depends on OF
+
 config OF_FLATTREE
 	bool
-	depends on OF
+	select DTC
 
 config OF_DYNAMIC
 	def_bool y
-	depends on OF && PPC_OF
+	depends on PPC_OF
 
 config OF_ADDRESS
 	def_bool y
-	depends on OF && !SPARC
+	depends on !SPARC
 
 config OF_IRQ
 	def_bool y
-	depends on OF && !SPARC
+	depends on !SPARC
 
 config OF_DEVICE
 	def_bool y
-	depends on OF && (SPARC || PPC_OF || MICROBLAZE)
 
 config OF_GPIO
 	def_bool y
-	depends on OF && (PPC_OF || MICROBLAZE) && GPIOLIB
+	depends on GPIOLIB && !SPARC
 	help
 	  OpenFirmware GPIO accessors
 
 config OF_I2C
 	def_tristate I2C
-	depends on OF && !SPARC && I2C
+	depends on I2C && !SPARC
 	help
 	  OpenFirmware I2C accessors
 
 config OF_SPI
 	def_tristate SPI
-	depends on OF && (PPC_OF || MICROBLAZE) && SPI
+	depends on SPI && !SPARC
 	help
 	  OpenFirmware SPI accessors
 
 config OF_MDIO
 	def_tristate PHYLIB
-	depends on OF && PHYLIB
+	depends on PHYLIB
 	help
 	  OpenFirmware MDIO bus (Ethernet PHY) accessors
+
+endmenu # OF