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    SubjectRe: [PATCH 4/7] PM / Domains: Rework system suspend callback routines
    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?
    (cesky, pictures)

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