[PATCH] qe: add function qe_clock_source

[Timur Tabi]

Scott Wood wrote:

> In the absence of a BRG, the driver should just not support changing the 
> baud rate -- it shouldn't fail to function.

Since I don't have hardware that can test external clocks, I can't guarantee 
that any such code will work.

I'm sure there are a dozen things I could do to improve the driver as it 
stands, but I need to draw the line somewhere.

-- 
Timur Tabi
Linux Kernel Developer @ Freescale