| Bindings for DAC emulation using a digital potentiometer |
| |
| It is assumed that the dpot is used as a voltage divider between the |
| current dpot wiper setting and the maximum resistance of the dpot. The |
| divided voltage is provided by a vref regulator. |
| |
| .------. |
| .-----------. | | |
| | vref |--' .---. |
| | regulator |--. | | |
| '-----------' | | d | |
| | | p | |
| | | o | wiper |
| | | t |<---------+ |
| | | | |
| | '---' dac output voltage |
| | | |
| '------+------------+ |
| |
| Required properties: |
| - compatible: Should be "dpot-dac" |
| - vref-supply: The regulator supplying the voltage divider. |
| - io-channels: Channel node of the dpot to be used for the voltage division. |
| - io-channel-names: Should be "dpot". |
| |
| Example: |
| |
| &i2c { |
| dpot: mcp4651-503@28 { |
| compatible = "microchip,mcp4651-503"; |
| reg = <0x28>; |
| #io-channel-cells = <1>; |
| }; |
| }; |
| |
| dac { |
| compatible = "dpot-dac"; |
| vref-supply = <®_3v3>; |
| io-channels = <&dpot 0>; |
| io-channel-names = "dpot"; |
| }; |
