PM / Domains: Remove pm_genpd_poweron() API

Once genpd could be configured to be built with CONFIG_PM_RUNTIME unset
(nowadays CONFIG_PM), the pm_genpd_poweron() API served a purpose, since
it allowed users to power on a PM domain.

As such configuration no longer is supported, users shall solely rely on
using some of the runtime PM APIs to power on a PM domain.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/base/power/domain.c

@@ -192,6 +192,8 @@ static void genpd_queue_power_off_work(struct generic_pm_domain *genpd)
 	queue_work(pm_wq, &genpd->power_off_work);
 }
 
+static int pm_genpd_poweron(struct generic_pm_domain *genpd);
+
 /**
  * __pm_genpd_poweron - Restore power to a given PM domain and its masters.
  * @genpd: PM domain to power up.
@@ -245,7 +247,7 @@ static int __pm_genpd_poweron(struct generic_pm_domain *genpd)
  * pm_genpd_poweron - Restore power to a given PM domain and its masters.
  * @genpd: PM domain to power up.
  */
-int pm_genpd_poweron(struct generic_pm_domain *genpd)
+static int pm_genpd_poweron(struct generic_pm_domain *genpd)
 {
 	int ret;
 

include/linux/pm_domain.h

@@ -125,7 +125,6 @@ extern int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
 				     struct generic_pm_domain *target);
 extern void pm_genpd_init(struct generic_pm_domain *genpd,
 			  struct dev_power_governor *gov, bool is_off);
-extern int pm_genpd_poweron(struct generic_pm_domain *genpd);
 
 extern struct dev_power_governor simple_qos_governor;
 extern struct dev_power_governor pm_domain_always_on_gov;
@@ -164,10 +163,6 @@ static inline void pm_genpd_init(struct generic_pm_domain *genpd,
 				 struct dev_power_governor *gov, bool is_off)
 {
 }
-static inline int pm_genpd_poweron(struct generic_pm_domain *genpd)
-{
-	return -ENOSYS;
-}
 #endif
 
 static inline int pm_genpd_add_device(struct generic_pm_domain *genpd,