On Tue, 18 Nov 2008 14:24:14 -0800
David Daney [off-list ref] wrote:

In order to use Cavium OCTEON specific serial i/o drivers, we first
patch the 8250 driver to use replaceable I/O functions.  Compatible
I/O functions are added for existing iotypeS.

An added benefit of this change is that it makes it easy to factor
some of the existing special cases out to board/SOC specific support
code.

The alternative is to load up 8250.c with a bunch of OCTEON specific
iotype code and bug work-arounds.

Neither are pretty but this looks the better option I agree. Only niggle
is the use of "_fn" - Linux generally doesn't put types into variable
names.