tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
7title: RS485 serial communications
8
9description: 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
13maintainers:
14 - Rob Herring <robh@kernel.org>
15
16properties:
17 rs485-rts-delay:
18 description: prop-encoded-array <a b>
19 $ref: /schemas/types.yaml#/definitions/uint32-array
20 items:
21 - description: Delay between rts signal and beginning of data sent in
22 milliseconds. It corresponds to the delay before sending data.
23 default: 0
24 maximum: 100
25 - description: Delay between end of data sent and rts signal in milliseconds.
26 It corresponds to the delay after sending data and actual release
27 of the line.
28 default: 0
29 maximum: 100
30
31 rs485-rts-active-high:
32 description: drive RTS high when sending (this is the default).
33 $ref: /schemas/types.yaml#/definitions/flag
34
35 rs485-rts-active-low:
36 description: drive RTS low when sending (default is high).
37 $ref: /schemas/types.yaml#/definitions/flag
38
39 rs485-rx-active-high:
40 description: Polarity of receiver enable signal (when separate from RTS).
41 True indicates active high (default is low).
42 $ref: /schemas/types.yaml#/definitions/flag
43
44 linux,rs485-enabled-at-boot-time:
45 description: enables the rs485 feature at boot time. It can be disabled
46 later with proper ioctl.
47 $ref: /schemas/types.yaml#/definitions/flag
48
49 rs485-rx-during-tx:
50 description: enables the receiving of data even while sending data.
51 $ref: /schemas/types.yaml#/definitions/flag
52
53 rs485-term-gpios:
54 description: GPIO pin to enable RS485 bus termination.
55 maxItems: 1
56
57 rs485-rx-during-tx-gpios:
58 description: Output GPIO pin that sets the state of rs485-rx-during-tx. This
59 signal can be used to control the RX part of an RS485 transceiver. Thereby
60 the active state enables RX during TX.
61 maxItems: 1
62
63additionalProperties: true
64
65...