regulator: tps65132: add device-tree binding

Add tps65132 regulator device-tree binding documentation

Signed-off-by: Venkat Reddy Talla <vreddytalla@nvidia.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/Documentation/devicetree/bindings/regulator/tps65132-regulator.txt b/Documentation/devicetree/bindings/regulator/tps65132-regulator.txt
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+TPS65132 regulators
+
+Required properties:
+- compatible: "ti,tps65132"
+- reg: I2C slave address
+
+Optional Subnode:
+Device supports two regulators OUTP and OUTN. A sub node within the
+   device node describe the properties of these regulators. The sub-node
+   names must be as follows:
+       -For regulator outp, the sub node name should be "outp".
+       -For regulator outn, the sub node name should be "outn".
+
+-enable-gpios:(active high, output) Regulators are controlled by the input pins.
+   If it is connected to GPIO through host system then provide the
+   gpio number as per gpio.txt.
+-active-discharge-gpios: (active high, output) Some configurations use delay mechanisms
+  on the enable pin, to keep the regulator enabled for some time after
+  the enable signal goes low. This GPIO is used to actively discharge
+  the delay mechanism. Requires specification of ti,active-discharge-time-us
+-ti,active-discharge-time-us: how long the active discharge gpio should be
+  asserted for during active discharge, in microseconds.
+
+Each regulator is defined using the standard binding for regulators.
+
+Example:
+
+       tps65132@3e {
+               compatible = "ti,tps65132";
+               reg = <0x3e>;
+
+               outp {
+                       regulator-name = "outp";
+                       regulator-boot-on;
+                       regulator-always-on;
+                       enable-gpios = <&gpio 23 0>;
+               };
+
+               outn {
+                       regulator-name = "outn";
+                       regulator-boot-on;
+                       regulator-always-on;
+                       regulator-active-discharge = <0>;
+                       enable-gpios = <&gpio 40 0>;
+               };
+       };