iio/dac/dpot-dac.yaml

0001 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
0002 %YAML 1.2
0003 ---
0004 $id: http://devicetree.org/schemas/iio/dac/dpot-dac.yaml#
0005 $schema: http://devicetree.org/meta-schemas/core.yaml#
0006
0007 title: DAC emulation using a digital potentiometer
0008
0009 maintainers:
0010   - Peter Rosin <peda@axentia.se>
0011
0012 description: |
0013   It is assumed that the dpot is used as a voltage divider between the
0014   current dpot wiper setting and the maximum resistance of the dpot. The
0015   divided voltage is provided by a vref regulator.
0016
0017                   .------.
0018    .-----------.  |      |
0019    | vref      |--'    .---.
0020    | regulator |--.    |   |
0021    '-----------'  |    | d |
0022                   |    | p |
0023                   |    | o |  wiper
0024                   |    | t |<---------+
0025                   |    |   |
0026                   |    '---'       dac output voltage
0027                   |      |
0028                   '------+------------+
0029
0030 properties:
0031   compatible:
0032     const: dpot-dac
0033
0034   vref-supply:
0035     description: Regulator supplying the voltage divider.
0036
0037   io-channels:
0038     maxItems: 1
0039     description: |
0040       Channel node of the dpot to be used for the voltage division.
0041
0042   io-channel-names:
0043     const: dpot
0044
0045   "#io-channel-cells":
0046     const: 1
0047
0048 required:
0049   - compatible
0050   - vref-supply
0051   - io-channels
0052   - io-channel-names
0053
0054 additionalProperties: false
0055
0056 examples:
0057   - |
0058     dac {
0059         compatible = "dpot-dac";
0060         vref-supply = <&reg_3v3>;
0061         io-channels = <&dpot 0>;
0062         io-channel-names = "dpot";
0063     };
0064 ...