Florian Fainelli <f.fainelli-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> writes:

> In preparation for allowing BCM63xx to use this driver, we abstract I/O
> accessors such that we can easily change those later on.

This may even be a fix on rpi, since i/o from different devices can get
reordered and you're using the barrier variants now!

Reviewed-by: Eric Anholt <eric-WhKQ6XTQaPysTnJN9+BGXg@public.gmane.org>