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Subject[PATCH v2] PM/ Domains: Export of_genpd_get_from_provider function.
This function looks up a PM domain form the provider. This will be
useful to add parent/child domain relationship from the SoC specific
code. The caller of the function must make sure that PM domain provider
is already registered.

Cc: Rafael J. Wysocki <>
Reviewed-by: Ulf Hansson <>
Signed-off-by: Amit Daniel Kachhap <>
Changes from v1:
* Added Ulf Hansson Reviewed by.
* Cc'd to linux-pm

This patch may solve the same purpose which is done by earlier posts
1) - In this there were comments
for not using the PM domain name.

2) Ulf Hansson posted a patch which also solves
similar purpose but I feel this is slightly complex and involves changing
the genpd structure.

drivers/base/power/domain.c | 3 ++-
include/linux/pm_domain.h | 8 ++++++++
2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index 6a103a3..0d8780c 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -2088,7 +2088,7 @@ EXPORT_SYMBOL_GPL(of_genpd_del_provider);
* Returns a valid pointer to struct generic_pm_domain on success or ERR_PTR()
* on failure.
-static struct generic_pm_domain *of_genpd_get_from_provider(
+struct generic_pm_domain *of_genpd_get_from_provider(
struct of_phandle_args *genpdspec)
struct generic_pm_domain *genpd = ERR_PTR(-ENOENT);
@@ -2108,6 +2108,7 @@ static struct generic_pm_domain *of_genpd_get_from_provider(

return genpd;

* genpd_dev_pm_detach - Detach a device from its PM domain.
diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h
index 6cd20d5..a9edab2 100644
--- a/include/linux/pm_domain.h
+++ b/include/linux/pm_domain.h
@@ -271,6 +271,8 @@ typedef struct generic_pm_domain *(*genpd_xlate_t)(struct of_phandle_args *args,
int __of_genpd_add_provider(struct device_node *np, genpd_xlate_t xlate,
void *data);
void of_genpd_del_provider(struct device_node *np);
+struct generic_pm_domain *of_genpd_get_from_provider(
+ struct of_phandle_args *genpdspec);

struct generic_pm_domain *__of_genpd_xlate_simple(
struct of_phandle_args *genpdspec,
@@ -288,6 +290,12 @@ static inline int __of_genpd_add_provider(struct device_node *np,
static inline void of_genpd_del_provider(struct device_node *np) {}

+static inline struct generic_pm_domain *of_genpd_get_from_provider(
+ struct of_phandle_args *genpdspec)
+ return NULL;
#define __of_genpd_xlate_simple NULL
#define __of_genpd_xlate_onecell NULL


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