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    SubjectRe: [PATCH 4/7] PM / Domains: Rework system suspend callback routines
    On Friday, February 17, 2012, Pavel Machek wrote:
    > On Mon 2011-11-07 01:08:11, Rafael J. Wysocki wrote:
    > > From: Rafael J. Wysocki <>
    > >
    > > The current generic PM domains code attempts to use the generic
    > > system suspend operations along with the domains' device stop/start
    > > routines, which requires device drivers to assume that their
    > > system suspend/resume (and hibernation/restore) callbacks will always
    > > be used with generic PM domains. However, in theory, the same
    > > hardware may be used in devices that don't belong to any PM domain,
    > > in which case it would be necessary to add "fake" PM domains to
    > > satisfy the above assumption. Also, the domain the hardware belongs
    > > to may not be handled with the help of the generic code.
    > >
    > > To allow device drivers that may be used along with the generic PM
    > > domains code of more flexibility, add new device callbacks, .freeze(),
    > > .freeze_late(), .thaw_early() and .thaw(), that can be supplied by
    > > the drivers in addition to their "standard" system suspend and
    > > hibernation callbacks. These new callbacks, if defined, will be used
    > > by the generic PM domains code for the handling of system suspend and
    > > hibernation instead of the "standard" ones. This will allow drivers
    > > to be designed to work with generic PM domains as well as without
    > > them.
    > Should this go to Documentation/ somewhere? May concern is that we
    > have way too many callbacks these days. Why is fake PM domain such a
    > bad thing?

    I'm not sure what you mean, really. This particular patch only affects
    the generic PM domains framework, which only has a few users now.


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