serial: 8250_ingenic: support for Ingenic SoC UARTs

Introduce a driver suitable for use with the UARTs present in
Ingenic SoCs such as the JZ4740 & JZ4780. These are described as being
ns16550 compatible but aren't quite - they require the setting of an
extra bit in the FCR register to enable the UART module. The serial_out
implementation is the same as that in arch/mips/jz4740/serial.c - which
will shortly be removed.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiri Slaby <jslaby@suse.cz>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Cc: linux-serial@vger.kernel.org
Cc: linux-mips@linux-mips.org
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Peter Hurley <peter@hurleysoftware.com>
Cc: Alan Cox <alan@linux.intel.com>
Cc: linux-kernel@vger.kernel.org
Cc: Matthias Brugger <matthias.bgg@gmail.com>
Cc: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com>
Cc: Tony Lindgren <tony@atomide.com>
Cc: John Crispin <blogic@openwrt.org>
Patchwork: https://patchwork.linux-mips.org/patch/10159/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/tty/serial/8250/Kconfig b/drivers/tty/serial/8250/Kconfig
index c350703..43330ea 100644
--- a/drivers/tty/serial/8250/Kconfig
+++ b/drivers/tty/serial/8250/Kconfig
@@ -342,3 +342,12 @@ config SERIAL_8250_MT6577
 	help
 	  If you have a Mediatek based board and want to use the
 	  serial port, say Y to this option. If unsure, say N.
+
+config SERIAL_8250_INGENIC
+	bool "Support for Ingenic SoC serial ports"
+	depends on SERIAL_8250_CONSOLE && OF_FLATTREE
+	select LIBFDT
+	select SERIAL_EARLYCON
+	help
+	  If you have a system using an Ingenic SoC and wish to make use of
+	  its UARTs, say Y to this option. If unsure, say N.