87 lines
2.0 KiB
YAML
87 lines
2.0 KiB
YAML
|
# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
|
||
|
|
%YAML 1.2
|
||
|
|
---
|
||
|
|
$id: http://devicetree.org/schemas/iio/adc/envelope-detector.yaml#
|
||
|
|
$schema: http://devicetree.org/meta-schemas/core.yaml#
|
||
|
|
|
||
|
|
title: ADC envelope detector using a DAC and a comparator
|
||
|
|
|
||
|
|
maintainers:
|
||
|
|
- Peter Rosin <peda@axentia.se>
|
||
|
|
|
||
|
|
description: |
|
||
|
|
The DAC is used to find the peak level of an alternating voltage input
|
||
|
|
signal by a binary search using the output of a comparator wired to
|
||
|
|
an interrupt pin. Like so:
|
||
|
|
_
|
||
|
|
| \
|
||
|
|
input +------>-------|+ \
|
||
|
|
| \
|
||
|
|
.-------. | }---.
|
||
|
|
| | | / |
|
||
|
|
| dac|-->--|- / |
|
||
|
|
| | |_/ |
|
||
|
|
| | |
|
||
|
|
| | |
|
||
|
|
| irq|------<-------'
|
||
|
|
| |
|
||
|
|
'-------'
|
||
|
|
|
||
|
|
properties:
|
||
|
|
compatible:
|
||
|
|
const: axentia,tse850-envelope-detector
|
||
|
|
|
||
|
|
io-channels:
|
||
|
|
maxItems: 1
|
||
|
|
description: Channel node of the dac to be used for comparator input.
|
||
|
|
|
||
|
|
io-channel-names:
|
||
|
|
const: dac
|
||
|
|
|
||
|
|
interrupts:
|
||
|
|
maxItems: 1
|
||
|
|
|
||
|
|
interrupt-names:
|
||
|
|
const: comp
|
||
|
|
|
||
|
|
required:
|
||
|
|
- compatible
|
||
|
|
- io-channels
|
||
|
|
- io-channel-names
|
||
|
|
- interrupts
|
||
|
|
- interrupt-names
|
||
|
|
|
||
|
|
additionalProperties: false
|
||
|
|
|
||
|
|
examples:
|
||
|
|
- |
|
||
|
|
#include <dt-bindings/interrupt-controller/irq.h>
|
||
|
|
i2c {
|
||
|
|
#address-cells = <1>;
|
||
|
|
#size-cells = <0>;
|
||
|
|
dpot: dpot@28 {
|
||
|
|
compatible = "microchip,mcp4651-104";
|
||
|
|
reg = <0x28>;
|
||
|
|
#io-channel-cells = <1>;
|
||
|
|
};
|
||
|
|
};
|
||
|
|
|
||
|
|
dac: dac {
|
||
|
|
compatible = "dpot-dac";
|
||
|
|
vref-supply = <®_3v3>;
|
||
|
|
io-channels = <&dpot 0>;
|
||
|
|
io-channel-names = "dpot";
|
||
|
|
#io-channel-cells = <1>;
|
||
|
|
};
|
||
|
|
|
||
|
|
envelope-detector {
|
||
|
|
compatible = "axentia,tse850-envelope-detector";
|
||
|
|
io-channels = <&dac 0>;
|
||
|
|
io-channel-names = "dac";
|
||
|
|
|
||
|
|
interrupt-parent = <&gpio>;
|
||
|
|
interrupts = <3 IRQ_TYPE_EDGE_FALLING>;
|
||
|
|
interrupt-names = "comp";
|
||
|
|
};
|
||
|
|
...
|