--- zzzz-none-000/linux-4.4.60/Documentation/devicetree/bindings/cpufreq/cpufreq-dt.txt	2017-04-08 07:53:53.000000000 +0000
+++ dragonfly-4020-701/linux-4.4.60/Documentation/devicetree/bindings/cpufreq/cpufreq-dt.txt	2018-11-08 13:36:17.000000000 +0000
@@ -21,6 +21,8 @@
 - cooling-min-level:
 - cooling-max-level:
      Please refer to Documentation/devicetree/bindings/thermal/thermal.txt.
+- enable-cpu-regulator: Call regulator_enable and regulator_disable API for
+  CPU voltage supply regulator.
 
 Examples: