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1# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause2%YAML 1.23---4$id: http://devicetree.org/schemas/w1/w1-uart.yaml#5$schema: http://devicetree.org/meta-schemas/core.yaml#6 7title: UART 1-Wire Bus8 9maintainers:10 - Christoph Winklhofer <cj.winklhofer@gmail.com>11 12description: |13 UART 1-wire bus. Utilizes the UART interface via the Serial Device Bus14 to create the 1-Wire timing patterns.15 16 The UART peripheral must support full-duplex and operate in open-drain17 mode. The timing patterns are generated by a specific combination of18 baud-rate and transmitted byte, which corresponds to a 1-Wire read bit,19 write bit or reset pulse.20 21 The default baud-rate for reset and presence detection is 9600 and for22 a 1-Wire read or write operation 115200. In case the actual baud-rate23 is different from the requested one, the transmitted byte is adapted24 to generate the 1-Wire timing patterns.25 26 https://www.analog.com/en/technical-articles/using-a-uart-to-implement-a-1wire-bus-master.html27 28properties:29 compatible:30 const: w1-uart31 32 reset-bps:33 default: 960034 description:35 The baud rate for the 1-Wire reset and presence detect.36 37 write-0-bps:38 default: 11520039 description:40 The baud rate for the 1-Wire write-0 cycle.41 42 write-1-bps:43 default: 11520044 description:45 The baud rate for the 1-Wire write-1 and read cycle.46 47required:48 - compatible49 50additionalProperties:51 type: object52 53examples:54 - |55 serial {56 onewire {57 compatible = "w1-uart";58 };59 };60