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PM / Domains: Add power off/on function for system core suspend stage

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Introduce function pm_genpd_syscore_switch() and two wrappers around
it, pm_genpd_syscore_poweroff() and pm_genpd_syscore_poweron(),
allowing the callers to let the generic PM domains framework know
that the given device is not necessary any more and its PM domain
can be turned off (the former) or that the given device will be
required immediately, so its PM domain has to be turned on (the
latter) during the system core (syscore) stage of system suspend
(or hibernation) and resume.

These functions will be used for handling devices registered as
clock sources and clock event devices that belong to PM domains.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
This commit is contained in:
Rafael J. Wysocki 2012-08-06 01:39:57 +02:00
parent 802d8b49a7
commit 77f827de07
3 changed files with 71 additions and 6 deletions
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16
include/linux/pm_domain.h
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@ -258,4 +258,20 @@ static inline void genpd_queue_power_off_work(struct generic_pm_domain *gpd) {}
static inline void pm_genpd_poweroff_unused(void) {}
#endif
#ifdef CONFIG_PM_GENERIC_DOMAINS_SLEEP
extern void pm_genpd_syscore_switch(struct device *dev, bool suspend);
#else
static inline void pm_genpd_syscore_switch(struct device *dev, bool suspend) {}
#endif
static inline void pm_genpd_syscore_poweroff(struct device *dev)
{
pm_genpd_syscore_switch(dev, true);
}
static inline void pm_genpd_syscore_poweron(struct device *dev)
{
pm_genpd_syscore_switch(dev, false);
}
#endif /* _LINUX_PM_DOMAIN_H */