platform/i2c busses: pm runtime and system sleep

[Mark Brown]

On Fri, Feb 18, 2011 at 08:27:44PM +0000, Russell King - ARM Linux wrote:

> Do we have any pressing need to convert AMBA stuff?  I haven't heard any
> reason yet to convert them to runtime PM - they don't even make any
> runtime PM calls.

There's a bit of a chicken and egg problem in that it's not possible for
devices to make use of runtime PM unless the bus has runtime PM support
implemented - the bus implementation is mandatory, there's no default.