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# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: "http://devicetree.org/schemas/serial/serial.yaml#"
$schema: "http://devicetree.org/meta-schemas/core.yaml#"
title: Serial Interface Generic DT Bindings
maintainers:
- Greg Kroah-Hartman <gregkh@linuxfoundation.org>
description:
This document lists a set of generic properties for describing UARTs in a
device tree. Whether these properties apply to a particular device depends
on the DT bindings for the actual device.
properties:
$nodename:
pattern: "^serial(@.*)?$"
cts-gpios:
maxItems: 1
description:
Must contain a GPIO specifier, referring to the GPIO pin to be used as
the UART's CTS line.
dcd-gpios:
maxItems: 1
description:
Must contain a GPIO specifier, referring to the GPIO pin to be used as
the UART's DCD line.
dsr-gpios:
maxItems: 1
description:
Must contain a GPIO specifier, referring to the GPIO pin to be used as
the UART's DSR line.
dtr-gpios:
maxItems: 1
description:
Must contain a GPIO specifier, referring to the GPIO pin to be used as
the UART's DTR line.
rng-gpios:
maxItems: 1
description:
Must contain a GPIO specifier, referring to the GPIO pin to be used as
the UART's RNG line.
rts-gpios:
maxItems: 1
description:
Must contain a GPIO specifier, referring to the GPIO pin to be used as
the UART's RTS line.
uart-has-rtscts:
$ref: /schemas/types.yaml#/definitions/flag
description:
The presence of this property indicates that the UART has dedicated lines
for RTS/CTS hardware flow control, and that they are available for use
(wired and enabled by pinmux configuration). This depends on both the
UART hardware and the board wiring.
if:
required:
- uart-has-rtscts
then:
properties:
cts-gpios: false
rts-gpios: false
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