serial: New serial driver SCCNXP

This driver is a replacement for a SC26XX driver with a lot of
improvements and new features.
The main differences from the SC26XX driver:
- Removed dependency on MIPS. Driver can be used on any platform.
- Added support for SCC2681, SCC2691, SCC2692, SC28L91, SC28L92,
  SC28L202, SCC68681 and SCC68692 ICs.
- Using devm_-related functions.
- Improved error handling of serial port, improved FIFO handling.
- Ability to load multiple instances of drivers.

To avoid the possibility of regression, driver SC26XX left in the
system to confirm the stability of the driver on platforms where
it is being used.

Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Acked-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/Kconfig

@@ -1130,6 +1130,24 @@ config SERIAL_SC26XX_CONSOLE
 	help
 	  Support for Console on SC2681/SC2692 serial ports.
 
+config SERIAL_SCCNXP
+	bool "SCCNXP serial port support"
+	depends on !SERIAL_SC26XX
+	select SERIAL_CORE
+	default n
+	help
+	  This selects support for an advanced UART from NXP (Philips).
+	  Supported ICs are SCC2681, SCC2691, SCC2692, SC28L91, SC28L92,
+	  SC28L202, SCC68681 and SCC68692.
+	  Positioned as a replacement for the driver SC26XX.
+
+config SERIAL_SCCNXP_CONSOLE
+	bool "Console on SCCNXP serial port"
+	depends on SERIAL_SCCNXP
+	select SERIAL_CORE_CONSOLE
+	help
+	  Support for console on SCCNXP serial ports.
+
 config SERIAL_BFIN_SPORT
 	tristate "Blackfin SPORT emulate UART"
 	depends on BLACKFIN

drivers/tty/serial/Makefile

@@ -48,6 +48,7 @@ obj-$(CONFIG_SERIAL_MPSC) += mpsc.o
 obj-$(CONFIG_SERIAL_SB1250_DUART) += sb1250-duart.o
 obj-$(CONFIG_ETRAX_SERIAL) += crisv10.o
 obj-$(CONFIG_SERIAL_SC26XX) += sc26xx.o
+obj-$(CONFIG_SERIAL_SCCNXP) += sccnxp.o
 obj-$(CONFIG_SERIAL_JSM) += jsm/
 obj-$(CONFIG_SERIAL_TXX9) += serial_txx9.o
 obj-$(CONFIG_SERIAL_VR41XX) += vr41xx_siu.o