Re: [linux-pm] [PATCH 00/04][RFC] PM: Runtime platform device PM

[Pavel Machek <pavel@ucw.cz>]

Hi!


> > In the process of discussing a similar interface for OMAP, we dicussed
> > that having 3 states would be more useful.  Specifically, and
> > _enable(), _idle() and _disable() hook.  The _enable() and _idle()
> > hooks being exactly what you proposed above, but with the addition of
> > a _disable() hook which says not only can the device go idle, but that
> > the driver is really finished with the device.  In this case, more
> > aggresive PM measures could be taken, such as turning of regulators
> > that may have long latencies that may not be appropriate to turn off
> > in idle.
> 
> Hm.. I wonder when the driver is really finished with the device
> though. Only when the module is unloaded? If so then we could deal
> with the hard disable using platform bus notifiers (like in [04/04]).

I'd guess that they call disable() when /dev node is closed... and
idle() when device is opened but inactive.

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