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-Analog Devices AD5758 DAC device driver
-
-Required properties for the AD5758:
-	- compatible: Must be "adi,ad5758"
-	- reg: SPI chip select number for the device
-	- spi-max-frequency: Max SPI frequency to use (< 50000000)
-	- spi-cpha: is the only mode that is supported
-
-Required properties:
-
- - adi,dc-dc-mode: Mode of operation of the dc-to-dc converter
-		   Dynamic Power Control (DPC)
-		   In this mode, the AD5758 circuitry senses the output
-		   voltage and dynamically regulates the supply voltage,
-		   VDPC+, to meet compliance requirements plus an optimized
-		   headroom voltage for the output buffer.
-
-		   Programmable Power Control (PPC)
-		   In this mode, the VDPC+ voltage is user-programmable to
-		   a fixed level that needs to accommodate the maximum output
-		   load required.
-
-		   The output of the DAC core is either converted to a
-		   current or voltage output at the VIOUT pin. Only one mode
-		   can be enabled at any one time.
-
-		   The following values are currently supported:
-			* 1: DPC current mode
-			* 2: DPC voltage mode
-			* 3: PPC current mode
-
- Depending on the selected output mode (voltage or current) one of the
- two properties must
- be present:
-
- - adi,range-microvolt: Voltage output range
-		The array of voltage output ranges must contain two fields:
-		* <0 5000000>: 0 V to 5 V voltage range
-		* <0 10000000>: 0 V to 10 V voltage range
-		* <(-5000000) 5000000>: ±5 V voltage range
-		* <(-10000000) 10000000>: ±10 V voltage range
- - adi,range-microamp: Current output range
-		The array of current output ranges must contain two fields:
-		* <0 20000>: 0 mA to 20 mA current range
-		* <0 24000>: 0 mA to 24 mA current range
-		* <4 24000>: 4 mA to 20 mA current range
-		* <(-20000) 20000>: ±20 mA current range
-		* <(-24000) 24000>: ±24 mA current range
-		* <(-1000) 22000>: −1 mA to +22 mA current range
-
-Optional properties:
-
- - reset-gpios : GPIO spec for the RESET pin. If specified, it will be
-		 asserted during driver probe.
-
- - adi,dc-dc-ilim-microamp: The dc-to-dc converter current limit
-		   The following values are currently supported [uA]:
-			* 150000
-			* 200000
-			* 250000
-			* 300000
-			* 350000
-			* 400000
-
- - adi,slew-time-us: The time it takes for the output to reach the
- full scale [uS]
-		     The supported range is between 133us up to 1023984375us
-
-AD5758 Example:
-
-	dac@0 {
-		compatible = "adi,ad5758";
-		reg = <0>;
-		spi-max-frequency = <1000000>;
-		spi-cpha;
-
-		reset-gpios = <&gpio 22 0>;
-
-		adi,dc-dc-mode = <2>;
-		adi,range-microvolt = <0 10000000>;
-		adi,dc-dc-ilim-microamp = <200000>;
-		adi,slew-time-us = <125000>;
-	};