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Commit 8bc0251d authored by Rafael J. Wysocki's avatar Rafael J. Wysocki
Browse files

PM / Domains: Add power-on function using names to identify domains 



It sometimes is necessary to turn on a given PM domain when only
the name of it is known and the domain pointer is not readily
available.  For this reason, add a new helper function,
pm_genpd_name_poweron(), allowing the caller to turn on a PM domain
using its name for identification.  To avoid code duplication,
move the domain lookup code to a separate function.

Signed-off-by: default avatarRafael J. Wysocki <rjw@sisk.pl>
parent fb7268be

drivers/base/power/domain.c

+31 −15
Original line number Diff line number Diff line
@@ -53,6 +53,24 @@ 
static LIST_HEAD(gpd_list);

static DEFINE_MUTEX(gpd_list_lock);



static struct generic_pm_domain *pm_genpd_lookup_name(const char *domain_name)

{

	struct generic_pm_domain *genpd = NULL, *gpd;



	if (IS_ERR_OR_NULL(domain_name))

		return NULL;



	mutex_lock(&gpd_list_lock);

	list_for_each_entry(gpd, &gpd_list, gpd_list_node) {

		if (!strcmp(gpd->name, domain_name)) {

			genpd = gpd;

			break;

		}

	}

	mutex_unlock(&gpd_list_lock);

	return genpd;

}



#ifdef CONFIG_PM



struct generic_pm_domain *dev_to_genpd(struct device *dev)
@@ -262,6 +280,18 @@ int pm_genpd_poweron(struct generic_pm_domain *genpd) 
	return ret;

}



/**

 * pm_genpd_name_poweron - Restore power to a given PM domain and its masters.

 * @domain_name: Name of the PM domain to power up.

 */

int pm_genpd_name_poweron(const char *domain_name)

{

	struct generic_pm_domain *genpd;



	genpd = pm_genpd_lookup_name(domain_name);

	return genpd ? pm_genpd_poweron(genpd) : -EINVAL;

}



#endif /* CONFIG_PM */



#ifdef CONFIG_PM_RUNTIME
@@ -1475,21 +1505,7 @@ int __pm_genpd_of_add_device(struct device_node *genpd_node, struct device *dev, 
int __pm_genpd_name_add_device(const char *domain_name, struct device *dev,

			       struct gpd_timing_data *td)

{

	struct generic_pm_domain *genpd = NULL, *gpd;



	if (IS_ERR_OR_NULL(domain_name) || IS_ERR_OR_NULL(dev))

		return -EINVAL;



	mutex_lock(&gpd_list_lock);

	list_for_each_entry(gpd, &gpd_list, gpd_list_node) {

		if (!strcmp(gpd->name, domain_name)) {

			genpd = gpd;

			break;

		}

	}

	mutex_unlock(&gpd_list_lock);



	return __pm_genpd_add_device(genpd, dev, td);

	return __pm_genpd_add_device(pm_genpd_lookup_name(domain_name), dev, td);

}



/**

include/linux/pm_domain.h

+5 −0
Original line number Diff line number Diff line
@@ -161,6 +161,7 @@ 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 int pm_genpd_name_poweron(const char *domain_name);



extern bool default_stop_ok(struct device *dev);
@@ -240,6 +241,10 @@ static inline int pm_genpd_poweron(struct generic_pm_domain *genpd) 
{

	return -ENOSYS;

}

static inline int pm_genpd_name_poweron(const char *domain_name)

{

	return -ENOSYS;

}

static inline bool default_stop_ok(struct device *dev)

{

	return false;