PM / Domains: Export pm_genpd_poweron() in header

Allow SoC-specific code to call pm_genpd_poweron().

Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h
index 98491ee..14fb095 100644
--- a/include/linux/pm_domain.h
+++ b/include/linux/pm_domain.h
@@ -63,6 +63,7 @@
 				     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);
 #else
 static inline int pm_genpd_add_device(struct generic_pm_domain *genpd,
 				      struct device *dev)
@@ -86,6 +87,10 @@
 }
 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
 
 #endif /* _LINUX_PM_DOMAIN_H */