Documentation: tps65912: Add DT bindings for the TPS65912 PMIC

The TPS65912 PMIC contains several regulators and a GPIO controller.
Add bindings for the TPS65912 PMIC.

Signed-off-by: Andrew F. Davis <afd@ti.com>
Acked-by: Rob Herring <robh@kernel.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

diff --git a/Documentation/devicetree/bindings/mfd/tps65912.txt b/Documentation/devicetree/bindings/mfd/tps65912.txt
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+* TPS65912 Power Management Integrated Circuit bindings
+
+Required properties:
+ - compatible          : Should be "ti,tps65912".
+ - reg                 : Slave address or chip select number (I2C / SPI).
+ - interrupt-parent    : The parent interrupt controller.
+ - interrupts          : The interrupt line the device is connected to.
+ - interrupt-controller        : Marks the device node as an interrupt controller.
+ - #interrupt-cells    : The number of cells to describe an IRQ, should be 2.
+                           The first cell is the IRQ number.
+                           The second cell is the flags, encoded as trigger
+                           masks from ../interrupt-controller/interrupts.txt.
+ - gpio-controller     : Marks the device node as a GPIO Controller.
+ - #gpio-cells         : Should be two.  The first cell is the pin number and
+                           the second cell is used to specify flags.
+                           See ../gpio/gpio.txt for more information.
+ - regulators:         : List of child nodes that specify the regulator
+                           initialization data. Child nodes must be named
+                           after their hardware counterparts: dcdc[1-4] and
+                           ldo[1-10]. Each child nodes is defined using the
+                           standard binding for regulators.
+
+Example:
+
+       pmic: tps65912@2d {
+               compatible = "ti,tps65912";
+               reg = <0x2d>;
+               interrupt-parent = <&gpio1>;
+               interrupts = <28 IRQ_TYPE_LEVEL_LOW>;
+               interrupt-controller;
+               #interrupt-cells = <2>;
+               gpio-controller;
+               #gpio-cells = <2>;
+
+               regulators {
+                       dcdc1 {
+                               regulator-name = "vdd_core";
+                               regulator-min-microvolt = <912000>;
+                               regulator-max-microvolt = <1144000>;
+                               regulator-boot-on;
+                               regulator-always-on;
+                       };
+
+                       ldo1 {
+                               regulator-name = "ldo1";
+                               regulator-min-microvolt = <1900000>;
+                               regulator-max-microvolt = <1900000>;
+                       };
+               };
+       };