diff --git a/include/linux/energy_model.h b/include/linux/energy_model.h
index b67a51c574b9..2c31d79bb922 100644
--- a/include/linux/energy_model.h
+++ b/include/linux/energy_model.h

@@ -29,6 +29,8 @@ struct em_perf_state {
  * em_perf_domain - Performance domain
  * @table:		List of performance states, in ascending order
  * @nr_perf_states:	Number of performance states
+ * @milliwatts:		Flag indicating the power values are in milli-Watts
+ *			or some other scale.
  * @cpus:		Cpumask covering the CPUs of the domain. It's here
  *			for performance reasons to avoid potential cache
  *			misses during energy calculations in the scheduler

@@ -43,6 +45,7 @@ struct em_perf_state {
 struct em_perf_domain {
 	struct em_perf_state *table;
 	int nr_perf_states;
+	bool milliwatts;
 	unsigned long cpus[];
 };