Commit 5d6be70a authored by Ulf Hansson's avatar Ulf Hansson Committed by Rafael J. Wysocki
Browse files

PM / Domains: Introduce option to attach a device by name to genpd 



For the multiple PM domain case, let's introduce a new function called
genpd_dev_pm_attach_by_name(). This allows a device to be associated with
its PM domain through genpd, by using a name based lookup.

Note that, genpd_dev_pm_attach_by_name() shall only be called by the driver
core / PM core, similar to how the existing dev_pm_domain_attach_by_id()
makes use of genpd_dev_pm_attach_by_id(). However, this is implemented by
following changes on top.

Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
Tested-by: default avatarRajendra Nayak <rnayak@codeaurora.org>
Reviewed-by: default avatarViresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 79a5c451

drivers/base/power/domain.c

+24 −0
Original line number Diff line number Diff line
@@ -2374,6 +2374,30 @@ struct device *genpd_dev_pm_attach_by_id(struct device *dev, 
}

EXPORT_SYMBOL_GPL(genpd_dev_pm_attach_by_id);



/**

 * genpd_dev_pm_attach_by_name - Associate a device with one of its PM domains.

 * @dev: The device used to lookup the PM domain.

 * @name: The name of the PM domain.

 *

 * Parse device's OF node to find a PM domain specifier using the

 * power-domain-names DT property. For further description see

 * genpd_dev_pm_attach_by_id().

 */

struct device *genpd_dev_pm_attach_by_name(struct device *dev, char *name)

{

	int index;



	if (!dev->of_node)

		return NULL;



	index = of_property_match_string(dev->of_node, "power-domain-names",

					 name);

	if (index < 0)

		return NULL;



	return genpd_dev_pm_attach_by_id(dev, index);

}



static const struct of_device_id idle_state_match[] = {

	{ .compatible = "domain-idle-state", },

	{ }

include/linux/pm_domain.h

+8 −0
Original line number Diff line number Diff line
@@ -239,6 +239,8 @@ unsigned int of_genpd_opp_to_performance_state(struct device *dev, 
int genpd_dev_pm_attach(struct device *dev);

struct device *genpd_dev_pm_attach_by_id(struct device *dev,

					 unsigned int index);

struct device *genpd_dev_pm_attach_by_name(struct device *dev,

					   char *name);

#else /* !CONFIG_PM_GENERIC_DOMAINS_OF */

static inline int of_genpd_add_provider_simple(struct device_node *np,

					struct generic_pm_domain *genpd)
@@ -290,6 +292,12 @@ static inline struct device *genpd_dev_pm_attach_by_id(struct device *dev, 
	return NULL;

}



static inline struct device *genpd_dev_pm_attach_by_name(struct device *dev,

							 char *name)

{

	return NULL;

}



static inline

struct generic_pm_domain *of_genpd_remove_last(struct device_node *np)

{

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