diff --git a/[refs] b/[refs]
index 854ea853b2c4..5273bca2a51c 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 56e05fdb6d1fe02b7d28391332cf65a77bffd691
+refs/heads/master: 12cb08ba50b73be97e555bcdf84e8f21a196794b
diff --git a/trunk/drivers/thermal/cpu_cooling.c b/trunk/drivers/thermal/cpu_cooling.c
index aa9c38b1c3ac..9a1d82ef491e 100644
--- a/trunk/drivers/thermal/cpu_cooling.c
+++ b/trunk/drivers/thermal/cpu_cooling.c
@@ -413,6 +413,13 @@ static struct notifier_block thermal_cpufreq_notifier_block = {
 /**
  * cpufreq_cooling_register - function to create cpufreq cooling device.
  * @clip_cpus: cpumask of cpus where the frequency constraints will happen.
+ *
+ * This interface function registers the cpufreq cooling device with the name
+ * "thermal-cpufreq-%x". This api can support multiple instances of cpufreq
+ * cooling devices.
+ *
+ * Return: a valid struct thermal_cooling_device pointer on success,
+ * on failure, it returns a corresponding ERR_PTR().
  */
 struct thermal_cooling_device *cpufreq_cooling_register(
 	const struct cpumask *clip_cpus)