serial: 8250: move of_serial code to 8250 directory

As the of-serial driver is now 8250 specific, we can move the
file to a more appropriate place in teh 8250 subdirectory and
adapt the Kconfig help text and file name.

I'm leaving the CONFIG_SERIAL_OF_PLATFORM symbol unchanged
to avoid breaking user configuration files unnecessarily.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/8250/Kconfig

@@ -377,3 +377,12 @@ config SERIAL_8250_MID
 	  Selecting this option will enable handling of the extra features
 	  present on the UART found on Intel Medfield SOC and various other
 	  Intel platforms.
+
+config SERIAL_OF_PLATFORM
+	tristate "Devicetree based probing for 8250 ports"
+	depends on SERIAL_8250 && OF
+	help
+	  This option is used for all 8250 compatible serial ports that
+	  are probed through devicetree, including Open Firmware based
+	  PowerPC systems and embedded systems on architectures using the
+	  flattened device tree format.

drivers/tty/serial/8250/Makefile

@@ -28,5 +28,6 @@ obj-$(CONFIG_SERIAL_8250_MT6577)	+= 8250_mtk.o
 obj-$(CONFIG_SERIAL_8250_UNIPHIER)	+= 8250_uniphier.o
 obj-$(CONFIG_SERIAL_8250_INGENIC)	+= 8250_ingenic.o
 obj-$(CONFIG_SERIAL_8250_MID)		+= 8250_mid.o
+obj-$(CONFIG_SERIAL_8250_OF)		+= 8250_of.o
 
 CFLAGS_8250_ingenic.o += -I$(srctree)/scripts/dtc/libfdt

drivers/tty/serial/Kconfig

@@ -1096,16 +1096,6 @@ config SERIAL_NETX_CONSOLE
 	  If you have enabled the serial port on the Hilscher NetX SoC
 	  you can make it the console by answering Y to this option.
 
-config SERIAL_OF_PLATFORM
-	tristate "Serial port on Open Firmware platform bus"
-	depends on OF
-	depends on SERIAL_8250
-	help
-	  If you have a PowerPC based system that has serial ports
-	  on a platform specific bus, you should enable this option.
-	  Currently, only 8250 compatible ports are supported, but
-	  others can easily be added.
-
 config SERIAL_OMAP
 	tristate "OMAP serial port support"
 	depends on ARCH_OMAP2PLUS

drivers/tty/serial/Makefile

@@ -63,7 +63,6 @@ obj-$(CONFIG_SERIAL_ATMEL) += atmel_serial.o
 obj-$(CONFIG_SERIAL_UARTLITE) += uartlite.o
 obj-$(CONFIG_SERIAL_MSM) += msm_serial.o
 obj-$(CONFIG_SERIAL_NETX) += netx-serial.o
-obj-$(CONFIG_SERIAL_OF_PLATFORM) += of_serial.o
 obj-$(CONFIG_SERIAL_KGDB_NMI) += kgdb_nmi.o
 obj-$(CONFIG_SERIAL_KS8695) += serial_ks8695.o
 obj-$(CONFIG_SERIAL_OMAP) += omap-serial.o