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diff --git a/Documentation/devicetree/bindings/iio/dac/ad7303.txt b/Documentation/devicetree/bindings/iio/dac/ad7303.txt
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+Analog Devices AD7303 DAC device driver
+
+Required properties:
+        - compatible: Must be "adi,ad7303"
+        - reg: SPI chip select number for the device
+        - spi-max-frequency: Max SPI frequency to use (< 30000000)
+        - Vdd-supply: Phandle to the Vdd power supply
+
+Optional properties:
+        - REF-supply: Phandle to the external reference voltage supply. This should
+          only be set if there is an external reference voltage connected to the REF
+          pin. If the property is not set Vdd/2 is used as the reference voltage.
+
+Example:
+
+                ad7303@4 {
+                        compatible = "adi,ad7303";
+                        reg = <4>;
+                        spi-max-frequency = <10000000>;
+                        Vdd-supply = <&vdd_supply>;
+                        adi,use-external-reference;
+                        REF-supply = <&vref_supply>;
+                };