From d79b6fe17aa279c7015a9c4ee88809dad4be9959 Mon Sep 17 00:00:00 2001 From: Geert Uytterhoeven Date: Thu, 25 Sep 2014 18:28:28 +0200 Subject: PM / Domains: Add genpd attach/detach callbacks While a PM domain can enable PM runtime management of its devices' module clocks by setting genpd->dev_ops.stop = pm_clk_suspend; genpd->dev_ops.start = pm_clk_resume; this also requires registering the clocks with the pm_clk subsystem. In the legacy case, this is handled by the platform code, after attaching the device to its PM domain. When the devices are instantiated from DT, devices are attached to their PM domains by generic code, leaving no method for the platform-specific PM domain code to register their clocks. Add two callbacks, allowing a PM domain to perform platform-specific tasks when a device is attached to or detached from a PM domain. Signed-off-by: Geert Uytterhoeven Reviewed-by: Ulf Hansson Signed-off-by: Rafael J. Wysocki diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c index cd40057..2a9f4c5 100644 --- a/drivers/base/power/domain.c +++ b/drivers/base/power/domain.c @@ -1436,6 +1436,9 @@ int __pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev, spin_unlock_irq(&dev->power.lock); + if (genpd->attach_dev) + genpd->attach_dev(dev); + mutex_lock(&gpd_data->lock); gpd_data->base.dev = dev; list_add_tail(&gpd_data->base.list_node, &genpd->dev_list); @@ -1528,6 +1531,9 @@ int pm_genpd_remove_device(struct generic_pm_domain *genpd, genpd->device_count--; genpd->max_off_time_changed = true; + if (genpd->detach_dev) + genpd->detach_dev(dev); + spin_lock_irq(&dev->power.lock); dev->pm_domain = NULL; diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h index 292079d..9a93e62 100644 --- a/include/linux/pm_domain.h +++ b/include/linux/pm_domain.h @@ -73,6 +73,8 @@ struct generic_pm_domain { bool cached_power_down_ok; struct device_node *of_node; /* Node in device tree */ struct gpd_cpu_data *cpu_data; + void (*attach_dev)(struct device *dev); + void (*detach_dev)(struct device *dev); }; static inline struct generic_pm_domain *pd_to_genpd(struct dev_pm_domain *pd) -- cgit v0.10.2