A non-trivial amount of RT288x/Au1xxx code is encapsulated into
ifdeffery in 8250_port / 8250_early and some if/switch UPIO_AU blocks.
Create a separate file from them and do a few additional cleanups.

I kept the Kconfig entry as bool because the code has somewhat tricky
dependency chain (mips arch code and 8250_of driver). It would be nice
to make it tristate but I don't know how blocking some invalid =m + =y
combinations would be best addressed. It should probably be best done
on top of this series independent of the split itself anyway.

UPIO_AU could now be removed because it's same as UPIO_MEM for the
remaining code path but I'm unsure if that's allowed (is the port
iotype part of stable ABI or not)?

v2:
- Define register map array lengths explicitly to avoid creating
  declaration trap.

Ilpo Järvinen (3):
  serial: 8250: RT288x/Au1xxx code away from core
  serial: 8250_rt288x: Name non-standard divisor latch reg
  serial: 8250_rt288x: Remove unnecessary UART_REG_UNMAPPED

 arch/mips/alchemy/common/platform.c   |  10 +-
 drivers/tty/serial/8250/8250_core.c   |   4 +
 drivers/tty/serial/8250/8250_early.c  |  21 ----
 drivers/tty/serial/8250/8250_of.c     |   4 +-
 drivers/tty/serial/8250/8250_port.c   |  78 ---------------
 drivers/tty/serial/8250/8250_rt288x.c | 135 ++++++++++++++++++++++++++
 drivers/tty/serial/8250/Makefile      |   1 +
 include/linux/serial_8250.h           |  14 ++-
 8 files changed, 163 insertions(+), 104 deletions(-)
 create mode 100644 drivers/tty/serial/8250/8250_rt288x.c

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2.30.2