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# SPDX-License-Identifier: GPL-2.0
%YAML 1.2
---
$id: http://devicetree.org/schemas/serial/rs485.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: RS485 serial communications
description: The RTS signal is capable of automatically controlling line
direction for the built-in half-duplex mode. The properties described
hereafter shall be given to a half-duplex capable UART node.
maintainers:
- Rob Herring <robh@kernel.org>
properties:
rs485-rts-delay:
description: prop-encoded-array <a b>
$ref: /schemas/types.yaml#/definitions/uint32-array
items:
items:
- description: Delay between rts signal and beginning of data sent in
milliseconds. It corresponds to the delay before sending data.
default: 0
maximum: 100
- description: Delay between end of data sent and rts signal in milliseconds.
It corresponds to the delay after sending data and actual release
of the line.
default: 0
maximum: 100
rs485-rts-active-high:
description: drive RTS high when sending (this is the default).
$ref: /schemas/types.yaml#/definitions/flag
rs485-rts-active-low:
description: drive RTS low when sending (default is high).
$ref: /schemas/types.yaml#/definitions/flag
rs485-rx-active-high:
description: Polarity of receiver enable signal (when separate from RTS).
True indicates active high (default is low).
$ref: /schemas/types.yaml#/definitions/flag
linux,rs485-enabled-at-boot-time:
description: enables the rs485 feature at boot time. It can be disabled
later with proper ioctl.
$ref: /schemas/types.yaml#/definitions/flag
rs485-rx-during-tx:
description: enables the receiving of data even while sending data.
$ref: /schemas/types.yaml#/definitions/flag
rs485-term-gpios:
description: GPIO pin to enable RS485 bus termination.
maxItems: 1
rs485-rx-during-tx-gpios:
description: Output GPIO pin that sets the state of rs485-rx-during-tx. This
signal can be used to control the RX part of an RS485 transceiver. Thereby
the active state enables RX during TX.
maxItems: 1
additionalProperties: true
...
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