Documentation: Add docs for max8925 dt

add docs for dt of max8925-mfd, max8925-backlight, and
max8925-battery

Signed-off-by: Qing Xu <qingx@marvell.com>
Signed-off-by: Haojian Zhuang <haojian.zhuang@gmail.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

diff --git a/Documentation/devicetree/bindings/mfd/max8925.txt b/Documentation/devicetree/bindings/mfd/max8925.txt
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+++ b/Documentation/devicetree/bindings/mfd/max8925.txt
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+* Maxim max8925 Power Management IC
+
+Required parent device properties:
+- compatible : "maxim,max8925"
+- reg : the I2C slave address for the max8925 chip
+- interrupts : IRQ line for the max8925 chip
+- interrupt-controller: describes the max8925 as an interrupt
+  controller (has its own domain)
+- #interrupt-cells : should be 1.
+       - The cell is the max8925 local IRQ number
+
+Optional parent device properties:
+- maxim,tsc-irq: there are 2 IRQ lines for max8925, one is indicated in
+  interrupts property, the other is indicated here.
+
+max8925 consists of a large and varied group of sub-devices:
+
+Device                  Supply Names    Description
+------                  ------------    -----------
+max8925-onkey          :               : On key
+max8925-rtc            :               : RTC
+max8925-regulator      :               : Regulators
+max8925-backlight      :               : Backlight
+max8925-touch          :               : Touchscreen
+max8925-power          :               : Charger
+
+Example:
+
+       pmic: max8925@3c {
+               compatible = "maxim,max8925";
+               reg = <0x3c>;
+               interrupts = <1>;
+               interrupt-parent = <&intcmux4>;
+               interrupt-controller;
+               #interrupt-cells = <1>;
+               maxim,tsc-irq = <0>;
+
+               regulators {
+                       SDV1 {
+                               regulator-min-microvolt = <637500>;
+                               regulator-max-microvolt = <1425000>;
+                               regulator-boot-on;
+                               regulator-always-on;
+                       };
+
+                       LDO1 {
+                               regulator-min-microvolt = <750000>;
+                               regulator-max-microvolt = <3900000>;
+                               regulator-boot-on;
+                               regulator-always-on;
+                       };
+
+               };
+               backlight {
+                       maxim,max8925-dual-string = <0>;
+               };
+               charger {
+                       batt-detect = <0>;
+                       topoff-threshold = <1>;
+                       fast-charge = <7>;
+                       no-temp-support = <0>;
+                       no-insert-detect = <0>;
+               };
+       };

diff --git a/Documentation/devicetree/bindings/power_supply/max8925_batter.txt b/Documentation/devicetree/bindings/power_supply/max8925_batter.txt
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+max8925-battery bindings
+~~~~~~~~~~~~~~~~
+
+Optional properties :
+ - batt-detect: whether support battery detect
+ - topoff-threshold: set charging current in topoff mode
+ - fast-charge: set charging current in fast mode
+ - no-temp-support: whether support temperature protection detect
+ - no-insert-detect: whether support insert detect
+
+Example:
+       charger {
+               batt-detect = <0>;
+               topoff-threshold = <1>;
+               fast-charge = <7>;
+               no-temp-support = <0>;
+               no-insert-detect = <0>;
+       };

diff --git a/Documentation/devicetree/bindings/video/backlight/max8925-backlight.txt b/Documentation/devicetree/bindings/video/backlight/max8925-backlight.txt
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+++ b/Documentation/devicetree/bindings/video/backlight/max8925-backlight.txt
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+88pm860x-backlight bindings
+
+Optional properties:
+  - maxim,max8925-dual-string: whether support dual string
+
+Example:
+
+       backlights {
+               maxim,max8925-dual-string = <0>;
+       };