Signed-off-by: Alban Bedel <alban.bedel@xxxxxxxxxxxxxxxxx>
---
.../bindings/regulator/constrained-supply.txt | 29 ++++++++++++++++++++++
1 file changed, 29 insertions(+)
create mode 100644 Documentation/devicetree/bindings/regulator/constrained-supply.txt
diff --git a/Documentation/devicetree/bindings/regulator/constrained-supply.txt b/Documentation/devicetree/bindings/regulator/constrained-supply.txt
new file mode 100644
index 0000000..3c85430
--- /dev/null
+++ b/Documentation/devicetree/bindings/regulator/constrained-supply.txt
@@ -0,0 +1,29 @@
+Constrained Supply Regulator
+
+This binding allow creating a virtual regulator that constrain its
+supply to provides the requested voltage. This is to allow using
+simple drivers that don't explicitly request a voltage on boards
+that have adjustable hardware regulators.
+
+Required properties:
+- compatible : Must be "regulator-constrained-supply".
+- vin-supply : phandle to the parent supply/regulator node
+
+Optional properties:
+- any property defined in regulator.txt
+
+Example:
+
+ /* Adjustable regulator for extension boards */
+ vdd_ext: regulator@0 {
+ regulator-min-microvolt = <1000000>;
+ regulator-max-microvolt = <10000000>;
+ };
+
+ /* An extension board that need 3.3V */
+ vdd_ext_board1: regulator@1 {
+ compatible = "regulator-constrained-supply";
+ regulator-min-microvolt = <3300000>;
+ regulator-max-microvolt = <3300000>;
+ vin-supply = <&vdd_ext>;
+ };
--
2.1.3
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