Documentation: tps65086: Add DT bindings for the TPS65086 PMIC

The TPS65086 PMIC contains several regulators and a GPO controller.
Add bindings for the TPS65086 PMIC.

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

diff --git a/Documentation/devicetree/bindings/mfd/tps65086.txt b/Documentation/devicetree/bindings/mfd/tps65086.txt
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+* TPS65086 Power Management Integrated Circuit (PMIC) bindings
+
+Required properties:
+ - compatible          : Should be "ti,tps65086".
+ - reg                 : I2C slave address.
+ - interrupt-parent    : Phandle to 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: buck[1-6],
+                            ldoa[1-3], swa1, swb[1-2], and vtt. Each child
+                            node is defined using the standard binding for
+                            regulators and the optional regulator properties
+                            defined below.
+
+Optional regulator properties:
+ - ti,regulator-step-size-25mv : This is applicable for buck[1,2,6], set this
+                                   if the regulator is factory set with a 25mv
+                                   step voltage mapping.
+ - ti,regulator-decay          : This is applicable for buck[1-6], set this if
+                                   the output needs to decay, default is for
+                                   the output to slew down.
+
+Example:
+
+       pmic: tps65086@5e {
+               compatible = "ti,tps65086";
+               reg = <0x5e>;
+               interrupt-parent = <&gpio1>;
+               interrupts = <28 IRQ_TYPE_LEVEL_LOW>;
+               interrupt-controller;
+               #interrupt-cells = <2>;
+               gpio-controller;
+               #gpio-cells = <2>;
+
+               regulators {
+                       buck1 {
+                               regulator-name = "vcc1";
+                               regulator-min-microvolt = <1600000>;
+                               regulator-max-microvolt = <1600000>;
+                               regulator-boot-on;
+                               ti,regulator-decay;
+                               ti,regulator-step-size-25mv;
+                       };
+               };
+       };