From: Paul Burton <redacted>

Introduce a driver suitable for use with the UARTs present in
Ingenic jz47xx series SoCs. 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 <redacted>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Cc: linux-serial@vger.kernel.org

---
V2 changes
Removed FSF address
Added select SERIAL_CORE_CONSOLE to fix a build error
---
 drivers/tty/serial/8250/8250_jz47xx.c | 225 ++++++++++++++++++++++++++++++++++
 drivers/tty/serial/8250/Kconfig       |   9 ++
 drivers/tty/serial/8250/Makefile      |   1 +
 3 files changed, 235 insertions(+)
 create mode 100644 drivers/tty/serial/8250/8250_jz47xx.c

[...]

diff --git a/drivers/tty/serial/8250/Kconfig b/drivers/tty/serial/8250/Kconfig
index 0fcbcd2..ebb298e 100644
--- a/drivers/tty/serial/8250/Kconfig
+++ b/drivers/tty/serial/8250/Kconfig

@@ -322,3 +322,12 @@ 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_JZ47XX
+	tristate "Support for Ingenic jz47xx series serial ports"
+	depends on SERIAL_8250
+	select SERIAL_EARLYCON
+	select SERIAL_CORE_CONSOLE
+	help
+	  If you have a system using an Ingenic jz47xx series SoC and wish to
+	  make use of its UARTs, say Y to this option. If unsure, say N.