1Bindings for DAC emulation using a digital potentiometer 2 3It is assumed that the dpot is used as a voltage divider between the 4current dpot wiper setting and the maximum resistance of the dpot. The 5divided voltage is provided by a vref regulator. 6 7 .------. 8 .-----------. | | 9 | vref |--' .---. 10 | regulator |--. | | 11 '-----------' | | d | 12 | | p | 13 | | o | wiper 14 | | t |<---------+ 15 | | | 16 | '---' dac output voltage 17 | | 18 '------+------------+ 19 20Required properties: 21- compatible: Should be "dpot-dac" 22- vref-supply: The regulator supplying the voltage divider. 23- io-channels: Channel node of the dpot to be used for the voltage division. 24- io-channel-names: Should be "dpot". 25 26Example: 27 28 &i2c { 29 dpot: mcp4651-503@28 { 30 compatible = "microchip,mcp4651-503"; 31 reg = <0x28>; 32 #io-channel-cells = <1>; 33 }; 34 }; 35 36 dac { 37 compatible = "dpot-dac"; 38 vref-supply = <®_3v3>; 39 io-channels = <&dpot 0>; 40 io-channel-names = "dpot"; 41 }; 42