Bindings/iio/dac/dpot-dac.yaml

   1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
   2 %YAML 1.2
   3 ---
   4 $id: http://devicetree.org/schemas/iio/dac/dpot-dac.yaml#
   5 $schema: http://devicetree.org/meta-schemas/core.yaml#
   6
   7 title: DAC emulation using a digital potentiometer
   8
   9 maintainers:
  10   - Peter Rosin <peda@axentia.se>
  11
  12 description: |
  13   It is assumed that the dpot is used as a voltage divider between the
  14   current dpot wiper setting and the maximum resistance of the dpot. The
  15   divided voltage is provided by a vref regulator.
  16
  17                   .------.
  18    .-----------.  |      |
  19    | vref      |--'    .---.
  20    | regulator |--.    |   |
  21    '-----------'  |    | d |
  22                   |    | p |
  23                   |    | o |  wiper
  24                   |    | t |<---------+
  25                   |    |   |
  26                   |    '---'       dac output voltage
  27                   |      |
  28                   '------+------------+
  29
  30 properties:
  31   compatible:
  32     const: dpot-dac
  33
  34   vref-supply:
  35     description: Regulator supplying the voltage divider.
  36
  37   io-channels:
  38     maxItems: 1
  39     description: |
  40       Channel node of the dpot to be used for the voltage division.
  41
  42   io-channel-names:
  43     const: dpot
  44
  45   "#io-channel-cells":
  46     const: 1
  47
  48 required:
  49   - compatible
  50   - vref-supply
  51   - io-channels
  52   - io-channel-names
  53
  54 additionalProperties: false
  55
  56 examples:
  57   - |
  58     dac {
  59         compatible = "dpot-dac";
  60         vref-supply = <&reg_3v3>;
  61         io-channels = <&dpot 0>;
  62         io-channel-names = "dpot";
  63     };
  64 ...