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diff --git a/kernel/Documentation/power/regulator/regulator.txt b/kernel/Documentation/power/regulator/regulator.txt
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+++ b/kernel/Documentation/power/regulator/regulator.txt
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+Regulator Driver Interface
+==========================
+
+The regulator driver interface is relatively simple and designed to allow
+regulator drivers to register their services with the core framework.
+
+
+Registration
+============
+
+Drivers can register a regulator by calling :-
+
+struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc,
+					 const struct regulator_config *config);
+
+This will register the regulator's capabilities and operations to the regulator
+core.
+
+Regulators can be unregistered by calling :-
+
+void regulator_unregister(struct regulator_dev *rdev);
+
+
+Regulator Events
+================
+Regulators can send events (e.g. overtemperature, undervoltage, etc) to
+consumer drivers by calling :-
+
+int regulator_notifier_call_chain(struct regulator_dev *rdev,
+				  unsigned long event, void *data);