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

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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: Ulf Hansson <ulf.hansson@linaro.org>
Tested-by: Rajendra Nayak <rnayak@codeaurora.org>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Ulf Hansson 2018-06-29 13:04:31 +02:00 • committed by Rafael J. Wysocki
parent 79a5c45199
commit 5d6be70add
2 changed files with 32 additions and 0 deletions
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24
drivers/base/power/domain.c
View file

@ -2374,6 +2374,30 @@ struct device *genpd_dev_pm_attach_by_id(struct device *dev,
} }
EXPORT_SYMBOL_GPL(genpd_dev_pm_attach_by_id); 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[] = { static const struct of_device_id idle_state_match[] = {
{ .compatible = "domain-idle-state", }, { .compatible = "domain-idle-state", },
{ } { }

8
include/linux/pm_domain.h
View file

@ -239,6 +239,8 @@ unsigned int of_genpd_opp_to_performance_state(struct device *dev,
int genpd_dev_pm_attach(struct device *dev); int genpd_dev_pm_attach(struct device *dev);
struct device *genpd_dev_pm_attach_by_id(struct device *dev, struct device *genpd_dev_pm_attach_by_id(struct device *dev,
unsigned int index); unsigned int index);
struct device *genpd_dev_pm_attach_by_name(struct device *dev,
char *name);
#else /* !CONFIG_PM_GENERIC_DOMAINS_OF */ #else /* !CONFIG_PM_GENERIC_DOMAINS_OF */
static inline int of_genpd_add_provider_simple(struct device_node *np, static inline int of_genpd_add_provider_simple(struct device_node *np,
struct generic_pm_domain *genpd) struct generic_pm_domain *genpd)
@ -290,6 +292,12 @@ static inline struct device *genpd_dev_pm_attach_by_id(struct device *dev,
return NULL; return NULL;
} }
static inline struct device *genpd_dev_pm_attach_by_name(struct device *dev,
char *name)
{
return NULL;
}
static inline static inline
struct generic_pm_domain *of_genpd_remove_last(struct device_node *np) struct generic_pm_domain *of_genpd_remove_last(struct device_node *np)
{ {