1 # SPDX-License-Identifier: GPL-2.0
4 $id: http://devicetree.org/schemas/serial/rs485.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: RS485 serial communications
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.
14 - Rob Herring <robh@kernel.org>
18 description: prop-encoded-array <a b>
19 $ref: /schemas/types.yaml#/definitions/uint32-array
22 - description: Delay between rts signal and beginning of data sent in
23 milliseconds. It corresponds to the delay before sending data.
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
32 rs485-rts-active-high:
33 description: drive RTS high when sending (this is the default).
34 $ref: /schemas/types.yaml#/definitions/flag
37 description: drive RTS low when sending (default is high).
38 $ref: /schemas/types.yaml#/definitions/flag
41 description: Polarity of receiver enable signal (when separate from RTS).
42 True indicates active high (default is low).
43 $ref: /schemas/types.yaml#/definitions/flag
45 linux,rs485-enabled-at-boot-time:
46 description: enables the rs485 feature at boot time. It can be disabled
47 later with proper ioctl.
48 $ref: /schemas/types.yaml#/definitions/flag
51 description: enables the receiving of data even while sending data.
52 $ref: /schemas/types.yaml#/definitions/flag
55 description: GPIO pin to enable RS485 bus termination.
58 rs485-rx-during-tx-gpios:
59 description: Output GPIO pin that sets the state of rs485-rx-during-tx. This
60 signal can be used to control the RX part of an RS485 transceiver. Thereby
61 the active state enables RX during TX.
64 additionalProperties: true