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    SubjectRe: [linux-pm] [RFC][PATCH 1/2] PM / Runtime: Support for generic I/O power domains
    On Fri, Apr 29, 2011 at 8:54 AM, Rafael J. Wysocki <> wrote:
    > From: Rafael J. Wysocki <>
    > Introcude common headers, helper functions and callbacks allowing
    > platforms to use simple generic power domains for runtime power
    > management.
    > Introduce struct generic_power_domain to be used for representing
    > power domains that each contain a number of devices and may be
    > master domains or subdomains with respect to other power domains.
    > Among other things, this structure includes callbacks to be
    > provided by platforms for performing specific tasks related to
    > power management (i.e. ->stop_device() may disable a device's
    > clocks, while ->start_device() may enable them, ->power_on() is
    > supposed to remove power from the entire power domain
    > and ->power_off() is supposed to restore it).
    > Introduce functions that can be used as power domain runtime PM
    > callbacks, pm_genpd_runtime_suspend() and pm_genpd_runtime_resume(),
    > as well as helper functions for the initialization of a power
    > domain represented by a struct generic_power_domain object,
    > adding a device to or removing a device from it and adding or
    > removing subdomains.
    > Signed-off-by: Rafael J. Wysocki <>


    The pm_domain is assuming that there is at most one powerdomain per
    device, which is perfectly fine with my machines and the concept of
    in-SoC powerdomains.

    However, if so, wouldn't it be possible to simply set powerdomain by
    setting a device's parent?
    For example, for a device, struct device *dev, and a powerdomain,
    struct device *pd, use
    "dev.parent = pd;", and let runtime-pm handle including the
    "dev_power_governor" in the pm_domain's pm related code.


    - MyungJoo

    MyungJoo Ham, Ph.D.
    Mobile Software Platform Lab,
    Digital Media and Communications (DMC) Business
    Samsung Electronics
    cell: 82-10-6714-2858

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