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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>;
+ };