Use devm_pm_opp_* API to simplify code.

Signed-off-by: Yangtao Li <tiny.windzz@gmail.com>
---
 drivers/devfreq/devfreq.c | 66 +--------------------------------------
 include/linux/devfreq.h   | 23 --------------
 2 files changed, 1 insertion(+), 88 deletions(-)

diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
index 6aa10de792b3..f593f30529ec 100644
--- a/drivers/devfreq/devfreq.c
+++ b/drivers/devfreq/devfreq.c

@@ -2004,40 +2004,6 @@ struct dev_pm_opp *devfreq_recommended_opp(struct device *dev,
 }
 EXPORT_SYMBOL(devfreq_recommended_opp);

-/**
- * devfreq_register_opp_notifier() - Helper function to get devfreq notified
- *                                  for any changes in the OPP availability
- *                                  changes
- * @dev:       The devfreq user device. (parent of devfreq)
- * @devfreq:   The devfreq object.
- */
-int devfreq_register_opp_notifier(struct device *dev, struct devfreq *devfreq)
-{
-       return dev_pm_opp_register_notifier(dev, &devfreq->nb);
-}
-EXPORT_SYMBOL(devfreq_register_opp_notifier);
-
-/**
- * devfreq_unregister_opp_notifier() - Helper function to stop getting devfreq
- *                                    notified for any changes in the OPP
- *                                    availability changes anymore.
- * @dev:       The devfreq user device. (parent of devfreq)
- * @devfreq:   The devfreq object.
- *
- * At exit() callback of devfreq_dev_profile, this must be included if
- * devfreq_recommended_opp is used.
- */
-int devfreq_unregister_opp_notifier(struct device *dev, struct devfreq *devfreq)
-{
-       return dev_pm_opp_unregister_notifier(dev, &devfreq->nb);
-}
-EXPORT_SYMBOL(devfreq_unregister_opp_notifier);
-
-static void devm_devfreq_opp_release(struct device *dev, void *res)
-{
-       devfreq_unregister_opp_notifier(dev, *(struct devfreq **)res);
-}
-
 /**
  * devm_devfreq_register_opp_notifier() - Resource-managed
  *                                       devfreq_register_opp_notifier()

@@ -2047,40 +2013,10 @@ static void devm_devfreq_opp_release(struct device *dev, void *res)
 int devm_devfreq_register_opp_notifier(struct device *dev,
                                       struct devfreq *devfreq)
 {
-       struct devfreq **ptr;
-       int ret;
-
-       ptr = devres_alloc(devm_devfreq_opp_release, sizeof(*ptr), GFP_KERNEL);
-       if (!ptr)
-               return -ENOMEM;
-
-       ret = devfreq_register_opp_notifier(dev, devfreq);
-       if (ret) {
-               devres_free(ptr);
-               return ret;
-       }
-
-       *ptr = devfreq;
-       devres_add(dev, ptr);
-
-       return 0;
+       return devm_pm_opp_register_notifier(dev, &devfreq->nb);
 }
 EXPORT_SYMBOL(devm_devfreq_register_opp_notifier);

-/**
- * devm_devfreq_unregister_opp_notifier() - Resource-managed
- *                                         devfreq_unregister_opp_notifier()
- * @dev:       The devfreq user device. (parent of devfreq)
- * @devfreq:   The devfreq object.
- */
-void devm_devfreq_unregister_opp_notifier(struct device *dev,
-                                        struct devfreq *devfreq)
-{
-       WARN_ON(devres_release(dev, devm_devfreq_opp_release,
-                              devm_devfreq_dev_match, devfreq));
-}
-EXPORT_SYMBOL(devm_devfreq_unregister_opp_notifier);