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* Texas Instruments ADS7950 family of A/DC chips

Required properties:
 - compatible: Must be one of "ti,ads7950", "ti,ads7951", "ti,ads7952",
   "ti,ads7953", "ti,ads7954", "ti,ads7955", "ti,ads7956", "ti,ads7957",
   "ti,ads7958", "ti,ads7959", "ti,ads7960", or "ti,ads7961"
 - reg: SPI chip select number for the device
 - #io-channel-cells: Must be 1 as per ../iio-bindings.txt
 - vref-supply: phandle to a regulator node that supplies the 2.5V or 5V
   reference voltage

Recommended properties:
 - spi-max-frequency: Definition as per
		Documentation/devicetree/bindings/spi/spi-bus.txt

Example:
adc@0 {
	compatible = "ti,ads7957";
	reg = <0>;
	#io-channel-cells = <1>;
	vref-supply = <&refin_supply>;
	spi-max-frequency = <10000000>;
};