If you have an idea in mind how arch/platform code should cleanly
pass data about known uart bugs to the uart driver, then let me know
what you have in mind.  I've no real attachment to what I proposed
here -- it just happened to be the solution I thought would be the least
offensive.  If there is a better idea floating around, I'll go ahead and
try to implement it.

My first guess is that "the uart driver" is our first historical mistake.
Non standard 8250ish uarts should be their own platform driver which uses
8250.c for support.

Things like 8250_dw.c is perhaps more the style we want to be looking at
for other devices and adjusting 8250.c as needed to export or split
methods up so they can be used as helpers.

Alan