Kernel-4.18.0-80.el8_dpot-dac

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 = <&reg_3v3>;
    io-channels = <&dpot 0>;
    io-channel-names = "dpot";
};