| Tom Rini | 53633a8 | 2024-02-29 12:33:36 -0500 | [diff] [blame] | 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 = <®_3v3>; |
| 61 | io-channels = <&dpot 0>; |
| 62 | io-channel-names = "dpot"; |
| 63 | }; |
| 64 | ... |