1 # SPDX-License-Identifier: GPL-2.0
2 %YAML 1.2
3 ---
4 $id: http://devicetree.org/schemas/serial/rs485.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
6
7 title: RS485 serial communications Bindings
8
9 description: The RTS signal is capable of automatically controlling line
10 direction for the built-in half-duplex mode. The properties described
11 hereafter shall be given to a half-duplex capable UART node.
12
13 maintainers:
14 - Rob Herring <robh@kernel.org>
15
16 properties:
17 rs485-rts-delay:
18 description: prop-encoded-array <a b>
19 $ref: /schemas/types.yaml#/definitions/uint32-array
20 items:
21 items:
22 - description: Delay between rts signal and beginning of data sent in
23 milliseconds. It corresponds to the delay before sending data.
24 default: 0
25 maximum: 100
26 - description: Delay between end of data sent and rts signal in milliseconds.
27 It corresponds to the delay after sending data and actual release
28 of the line.
29 default: 0
30 maximum: 100
31
32 rs485-rts-active-low:
33 description: drive RTS low when sending (default is high).
34 $ref: /schemas/types.yaml#/definitions/flag
35
36 rs485-rx-active-high:
37 description: Polarity of receiver enable signal (when separate from RTS).
38 True indicates active high (default is low).
39 $ref: /schemas/types.yaml#/definitions/flag
40
41 linux,rs485-enabled-at-boot-time:
42 description: enables the rs485 feature at boot time. It can be disabled
43 later with proper ioctl.
44 $ref: /schemas/types.yaml#/definitions/flag
45
46 rs485-rx-during-tx:
47 description: enables the receiving of data even while sending data.
48 $ref: /schemas/types.yaml#/definitions/flag
49
50 rs485-term-gpios:
51 description: GPIO pin to enable RS485 bus termination.
52 maxItems: 1
53
54 additionalProperties: true
55
56 ...
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