1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-C 1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
2 %YAML 1.2 2 %YAML 1.2
3 --- 3 ---
4 $id: http://devicetree.org/schemas/iio/dac/dpo 4 $id: http://devicetree.org/schemas/iio/dac/dpot-dac.yaml#
5 $schema: http://devicetree.org/meta-schemas/co 5 $schema: http://devicetree.org/meta-schemas/core.yaml#
6 6
7 title: DAC emulation using a digital potentiom 7 title: DAC emulation using a digital potentiometer
8 8
9 maintainers: 9 maintainers:
10 - Peter Rosin <peda@axentia.se> 10 - Peter Rosin <peda@axentia.se>
11 11
12 description: | 12 description: |
13 It is assumed that the dpot is used as a vol 13 It is assumed that the dpot is used as a voltage divider between the
14 current dpot wiper setting and the maximum r 14 current dpot wiper setting and the maximum resistance of the dpot. The
15 divided voltage is provided by a vref regula 15 divided voltage is provided by a vref regulator.
16 16
17 .------. 17 .------.
18 .-----------. | | 18 .-----------. | |
19 | vref |--' .---. 19 | vref |--' .---.
20 | regulator |--. | | 20 | regulator |--. | |
21 '-----------' | | d | 21 '-----------' | | d |
22 | | p | 22 | | p |
23 | | o | wiper 23 | | o | wiper
24 | | t |<---------+ 24 | | t |<---------+
25 | | | 25 | | |
26 | '---' dac output 26 | '---' dac output voltage
27 | | 27 | |
28 '------+------------+ 28 '------+------------+
29 29
30 properties: 30 properties:
31 compatible: 31 compatible:
32 const: dpot-dac 32 const: dpot-dac
33 33
34 vref-supply: 34 vref-supply:
35 description: Regulator supplying the volta 35 description: Regulator supplying the voltage divider.
36 36
37 io-channels: 37 io-channels:
38 maxItems: 1 38 maxItems: 1
39 description: | 39 description: |
40 Channel node of the dpot to be used for 40 Channel node of the dpot to be used for the voltage division.
41 41
42 io-channel-names: 42 io-channel-names:
43 const: dpot 43 const: dpot
44 44
45 "#io-channel-cells": 45 "#io-channel-cells":
46 const: 1 46 const: 1
47 47
48 required: 48 required:
49 - compatible 49 - compatible
50 - vref-supply 50 - vref-supply
51 - io-channels 51 - io-channels
52 - io-channel-names 52 - io-channel-names
53 53
54 additionalProperties: false 54 additionalProperties: false
55 55
56 examples: 56 examples:
57 - | 57 - |
58 dac { 58 dac {
59 compatible = "dpot-dac"; 59 compatible = "dpot-dac";
60 vref-supply = <®_3v3>; 60 vref-supply = <®_3v3>;
61 io-channels = <&dpot 0>; 61 io-channels = <&dpot 0>;
62 io-channel-names = "dpot"; 62 io-channel-names = "dpot";
63 }; 63 };
64 ... 64 ...
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