On Mon, Apr 29, 2013 at 11:16:28PM +0200, Arnd Bergmann wrote:

> Well, the only reason I see against putting it into drivers/mfd is that
> this place is becoming a dumping ground for stuff that doesn't have a
> real home anywhere else. On the other hand, this one would fit better
> than a lot of drivers that are already there, and it would actually remove
> the need for a global include/linux/*.h header file as the interface.

Well, this device should have a bunch of function drivers hanging off it
shouldn't it?  That's pretty much the definition of a MFD.