linux-kernel - [PATCH 1/4] devicetree: add a binding for a regulator that constrains its supply

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Date:	Mon, 24 Nov 2014 14:02:00 +0100
From:	Alban Bedel <alban.bedel@...onic-design.de>
To:	linux-kernel@...r.kernel.org
Cc:	devicetree@...r.kernel.org,
	Alban Bedel <alban.bedel@...onic-design.de>,
	Grant Likely <grant.likely@...aro.org>,
	Mark Brown <broonie@...nel.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	Kumar Gala <galak@...eaurora.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Mark Rutland <mark.rutland@....com>,
	Pawel Moll <pawel.moll@....com>,
	Rob Herring <robh+dt@...nel.org>
Subject: [PATCH 1/4] devicetree: add a binding for a regulator that constrains its supply

Signed-off-by: Alban Bedel <alban.bedel@...onic-design.de>
---
 .../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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