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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 | # 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"; }; }; |