On Thu, 2 Aug 2012, Magnus Damm wrote:

> From my point of view this all depends on what the hardware supports.
> If the USB host controller hardware can be powered down (power domain
> off, clock off) when no USB hardware is connected, but still perform
> hotplug detection of a newly added device, then if so then I'd like to
> see more fine grained PM support in the drivers. If that's not
> possible then I believe the more static approach (on probe/remove) is
> fine. Perhaps the latter is a good first step.

The two techniques are independent, and it's easy to implement either
one without the other.  Hence we might as well allow for both
approaches.

Alan Stern

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