dt-bindings: power: supply: Add DT bindings for max77650

Add the DT binding document for the battery charger module of max77650.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

diff --git a/Documentation/devicetree/bindings/power/supply/max77650-charger.txt b/Documentation/devicetree/bindings/power/supply/max77650-charger.txt
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+Battery charger driver for MAX77650 PMIC from Maxim Integrated.
+
+This module is part of the MAX77650 MFD device. For more details
+see Documentation/devicetree/bindings/mfd/max77650.txt.
+
+The charger is represented as a sub-node of the PMIC node on the device tree.
+
+Required properties:
+--------------------
+- compatible:          Must be "maxim,max77650-charger"
+
+Optional properties:
+--------------------
+- input-voltage-min-microvolt: Minimum CHGIN regulation voltage. Must be one
+                               of: 4000000, 4100000, 4200000, 4300000,
+                               4400000, 4500000, 4600000, 4700000.
+- input-current-limit-microamp:        CHGIN input current limit (in microamps). Must
+                               be one of: 95000, 190000, 285000, 380000,
+                               475000.
+
+Example:
+--------
+
+       charger {
+               compatible = "maxim,max77650-charger";
+               input-voltage-min-microvolt = <4200000>;
+               input-current-limit-microamp = <285000>;
+       };