Commit dedd1492 authored by Ulf Hansson's avatar Ulf Hansson
Browse files

PM / Domains: Introduce a genpd OF helper that removes a subdomain 



We already have the of_genpd_add_subdomain() helper, but no corresponding
of_genpd_remove_subdomain(), so let's add it. Subsequent changes starts to
make use of it.

Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
Acked-by: default avatarRafael J. Wysocki <rafael@kernel.org>
parent 9c6ceecb

drivers/base/power/domain.c

+38 −0
Original line number Diff line number Diff line
@@ -2302,6 +2302,44 @@ out: 
}

EXPORT_SYMBOL_GPL(of_genpd_add_subdomain);



/**

 * of_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain.

 * @parent_spec: OF phandle args to use for parent PM domain look-up

 * @subdomain_spec: OF phandle args to use for subdomain look-up

 *

 * Looks-up a parent PM domain and subdomain based upon phandle args

 * provided and removes the subdomain from the parent PM domain. Returns a

 * negative error code on failure.

 */

int of_genpd_remove_subdomain(struct of_phandle_args *parent_spec,

			      struct of_phandle_args *subdomain_spec)

{

	struct generic_pm_domain *parent, *subdomain;

	int ret;



	mutex_lock(&gpd_list_lock);



	parent = genpd_get_from_provider(parent_spec);

	if (IS_ERR(parent)) {

		ret = PTR_ERR(parent);

		goto out;

	}



	subdomain = genpd_get_from_provider(subdomain_spec);

	if (IS_ERR(subdomain)) {

		ret = PTR_ERR(subdomain);

		goto out;

	}



	ret = pm_genpd_remove_subdomain(parent, subdomain);



out:

	mutex_unlock(&gpd_list_lock);



	return ret;

}

EXPORT_SYMBOL_GPL(of_genpd_remove_subdomain);



/**

 * of_genpd_remove_last - Remove the last PM domain registered for a provider

 * @provider: Pointer to device structure associated with provider

include/linux/pm_domain.h

+8 −0
Original line number Diff line number Diff line
@@ -284,6 +284,8 @@ void of_genpd_del_provider(struct device_node *np); 
int of_genpd_add_device(struct of_phandle_args *args, struct device *dev);

int of_genpd_add_subdomain(struct of_phandle_args *parent_spec,

			   struct of_phandle_args *subdomain_spec);

int of_genpd_remove_subdomain(struct of_phandle_args *parent_spec,

			      struct of_phandle_args *subdomain_spec);

struct generic_pm_domain *of_genpd_remove_last(struct device_node *np);

int of_genpd_parse_idle_states(struct device_node *dn,

			       struct genpd_power_state **states, int *n);
@@ -322,6 +324,12 @@ static inline int of_genpd_add_subdomain(struct of_phandle_args *parent_spec, 
	return -ENODEV;

}



static inline int of_genpd_remove_subdomain(struct of_phandle_args *parent_spec,

					struct of_phandle_args *subdomain_spec)

{

	return -ENODEV;

}



static inline int of_genpd_parse_idle_states(struct device_node *dn,

			struct genpd_power_state **states, int *n)

{

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