diff --git a/drivers/opp/of.c b/drivers/opp/of.c
index f9f0b22bccbb..282eb5966fd0 100644
--- a/drivers/opp/of.c
+++ b/drivers/opp/of.c
@@ -1494,20 +1494,26 @@ _get_dt_power(struct device *dev, unsigned long *uW, unsigned long *kHz)
 	return 0;
 }
 
-/*
- * Callback function provided to the Energy Model framework upon registration.
+/**
+ * dev_pm_opp_calc_power() - Calculate power value for device with EM
+ * @dev		: Device for which an Energy Model has to be registered
+ * @uW		: New power value that is calculated
+ * @kHz		: Frequency for which the new power is calculated
+ *
  * This computes the power estimated by @dev at @kHz if it is the frequency
  * of an existing OPP, or at the frequency of the first OPP above @kHz otherwise
  * (see dev_pm_opp_find_freq_ceil()). This function updates @kHz to the ceiled
  * frequency and @uW to the associated power. The power is estimated as
  * P = C * V^2 * f with C being the device's capacitance and V and f
  * respectively the voltage and frequency of the OPP.
+ * It is also used as a callback function provided to the Energy Model
+ * framework upon registration.
  *
  * Returns -EINVAL if the power calculation failed because of missing
  * parameters, 0 otherwise.
  */
-static int __maybe_unused _get_power(struct device *dev, unsigned long *uW,
-				     unsigned long *kHz)
+int dev_pm_opp_calc_power(struct device *dev, unsigned long *uW,
+			  unsigned long *kHz)
 {
 	struct dev_pm_opp *opp;
 	struct device_node *np;
@@ -1544,6 +1550,7 @@ static int __maybe_unused _get_power(struct device *dev, unsigned long *uW,
 
 	return 0;
 }
+EXPORT_SYMBOL_GPL(dev_pm_opp_calc_power);
 
 static bool _of_has_opp_microwatt_property(struct device *dev)
 {
@@ -1619,7 +1626,7 @@ int dev_pm_opp_of_register_em(struct device *dev, struct cpumask *cpus)
 		goto failed;
 	}
 
-	EM_SET_ACTIVE_POWER_CB(em_cb, _get_power);
+	EM_SET_ACTIVE_POWER_CB(em_cb, dev_pm_opp_calc_power);
 
 register_em:
 	ret = em_dev_register_perf_domain(dev, nr_opp, &em_cb, cpus, true);
diff --git a/include/linux/pm_opp.h b/include/linux/pm_opp.h
index 065a47382302..dd7c8441af42 100644
--- a/include/linux/pm_opp.h
+++ b/include/linux/pm_opp.h
@@ -476,6 +476,8 @@ struct device_node *dev_pm_opp_get_of_node(struct dev_pm_opp *opp);
 int of_get_required_opp_performance_state(struct device_node *np, int index);
 int dev_pm_opp_of_find_icc_paths(struct device *dev, struct opp_table *opp_table);
 int dev_pm_opp_of_register_em(struct device *dev, struct cpumask *cpus);
+int dev_pm_opp_calc_power(struct device *dev, unsigned long *uW,
+			  unsigned long *kHz);
 static inline void dev_pm_opp_of_unregister_em(struct device *dev)
 {
 	em_dev_unregister_perf_domain(dev);
@@ -539,6 +541,12 @@ static inline void dev_pm_opp_of_unregister_em(struct device *dev)
 {
 }
 
+static inline int dev_pm_opp_calc_power(struct device *dev, unsigned long *uW,
+					unsigned long *kHz)
+{
+	return -EOPNOTSUPP;
+}
+
 static inline int of_get_required_opp_performance_state(struct device_node *np, int index)
 {
 	return -EOPNOTSUPP;