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.

Signed-off-by: Amit Daniel Kachhap <redacted>
---
This patch may solve the same purpose which is done by earlier posts
1) https://lkml.org/lkml/2014/11/24/319 - In this there were comments
for not using the PM domain name.

2) Ulf Hansson posted a patch
http://www.spinics.net/lists/linux-samsung-soc/msg39745.html 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 d822753..5d7a2c1 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c

@@ -2129,7 +2129,7 @@ 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);

@@ -2149,6 +2149,7 @@ static struct generic_pm_domain *of_genpd_get_from_provider(

        return genpd;
 }
+EXPORT_SYMBOL_GPL(of_genpd_get_from_provider);

 /**
  * 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 9690827..4954e24 100644
--- a/include/linux/pm_domain.h
+++ b/include/linux/pm_domain.h

@@ -282,6 +282,8 @@ 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,

@@ -299,6 +301,12 @@ 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

--

1.7.9.5