On Mon, Mar 03, 2014 at 05:02:07PM +0100, Tomasz Figa wrote:

On a number of platforms, devices are part of controllable power
domains, which need to be enabled before such devices can be accessed
and may be powered down when the device is idle to save some power.
This means that on systems that support power domain control using
generic power domains subsystem, it is necessary to add device to its
power domain before binding a driver to it and remove it from its power
domain after its driver is unbound to make sure that an unused device
does not affect power domain state.

Reviewed-by: Mark Brown <redacted>
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