Device Tree vs. Device drivers

[Bruce Dawson]

Does anyone have experience with device drivers and how they interact
with the new Device Tree methodology? 

I've got a project using a BeagleBoneBlack and need to modify the serial
driver (6530/16550A) for some *very* time critical applications. Plus, I
haven't played with the serial driver (or many others) since Linux 0.92
and 1.2.xx. 

Things have changed a lot, and I'm just looking for some
guidance/mentor.

--Bruce