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# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
%YAML 1.2
---
$id: http://devicetree.org/schemas/w1/w1-uart.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: UART 1-Wire Bus
maintainers:
- Christoph Winklhofer <cj.winklhofer@gmail.com>
description: |
UART 1-wire bus. Utilizes the UART interface via the Serial Device Bus
to create the 1-Wire timing patterns.
The UART peripheral must support full-duplex and operate in open-drain
mode. The timing patterns are generated by a specific combination of
baud-rate and transmitted byte, which corresponds to a 1-Wire read bit,
write bit or reset pulse.
The default baud-rate for reset and presence detection is 9600 and for
a 1-Wire read or write operation 115200. In case the actual baud-rate
is different from the requested one, the transmitted byte is adapted
to generate the 1-Wire timing patterns.
https://www.analog.com/en/technical-articles/using-a-uart-to-implement-a-1wire-bus-master.html
properties:
compatible:
const: w1-uart
reset-bps:
default: 9600
description:
The baud rate for the 1-Wire reset and presence detect.
write-0-bps:
default: 115200
description:
The baud rate for the 1-Wire write-0 cycle.
write-1-bps:
default: 115200
description:
The baud rate for the 1-Wire write-1 and read cycle.
required:
- compatible
additionalProperties:
type: object
examples:
- |
serial {
onewire {
compatible = "w1-uart";
};
};
|
