PM / devfreq: Add current freq callback in device profile

Devfreq returns governor predicted frequency as current frequency
via sysfs interface. But device may not support all frequencies
that governor predicts. So add a callback in device profile to get
current freq from driver. Also add a new sysfs node to expose
governor predicted next target frequency.

Signed-off-by: Rajagopal Venkat <rajagopal.venkat@linaro.org>
Acked-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h
index ee243a3229b8..7e2e2ea4a70f 100644
--- a/include/linux/devfreq.h
+++ b/include/linux/devfreq.h
@@ -66,6 +66,8 @@ struct devfreq_dev_status {
  *                      explained above with "DEVFREQ_FLAG_*" macros.
  * @get_dev_status      The device should provide the current performance
  *                      status to devfreq, which is used by governors.
+ * @get_cur_freq        The device should provide the current frequency
+ *                      at which it is operating.
  * @exit                An optional callback that is called when devfreq
  *                      is removing the devfreq object due to error or
  *                      from devfreq_remove_device() call. If the user
@@ -79,6 +81,7 @@ struct devfreq_dev_profile {
         int (*target)(struct device *dev, unsigned long *freq, u32 flags);
         int (*get_dev_status)(struct device *dev,
                               struct devfreq_dev_status *stat);
+        int (*get_cur_freq)(struct device *dev, unsigned long *freq);
         void (*exit)(struct device *dev);
 };