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diff --git a/Documentation/devicetree/bindings/rtc/dallas,ds1339.txt b/Documentation/devicetree/bindings/rtc/dallas,ds1339.txt
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+* Dallas DS1339         I2C Serial Real-Time Clock
+
+Required properties:
+- compatible: Should contain "dallas,ds1339".
+- reg: I2C address for chip
+
+Optional properties:
+- trickle-resistor-ohms : Selected resistor for trickle charger
+        Values usable for ds1339 are 250, 2000, 4000
+        Should be given if trickle charger should be enabled
+- trickle-diode-disable : Do not use internal trickle charger diode
+        Should be given if internal trickle charger diode should be disabled
+Example:
+        ds1339: rtc@68 {
+                compatible = "dallas,ds1339";
+                trickle-resistor-ohms = <250>;
+                reg = <0x68>;
+        };