Commit d50f974c authored by Benjamin Gaignard's avatar Benjamin Gaignard Committed by Rob Herring

dt-bindings: serial: Convert rs485 bindings to json-schema

Convert rs485 binding to yaml style file.
Signed-off-by: default avatarBenjamin Gaignard <benjamin.gaignard@st.com>
Signed-off-by: default avatarRob Herring <robh@kernel.org>
parent c5c689d3
* RS485 serial communications See rs485.yaml
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.
Optional properties:
- rs485-rts-delay: prop-encoded-array <a b> where:
* a is the delay between rts signal and beginning of data sent in milliseconds.
it corresponds to the delay before sending data.
* b is the 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.
If this property is not specified, <0 0> is assumed.
- rs485-rts-active-low: drive RTS low when sending (default is high).
- linux,rs485-enabled-at-boot-time: empty property telling to enable the rs485
feature at boot time. It can be disabled later with proper ioctl.
- rs485-rx-during-tx: empty property that enables the receiving of data even
while sending data.
RS485 example for Atmel USART:
usart0: serial@fff8c000 {
compatible = "atmel,at91sam9260-usart";
reg = <0xfff8c000 0x4000>;
interrupts = <7>;
atmel,use-dma-rx;
atmel,use-dma-tx;
linux,rs485-enabled-at-boot-time;
rs485-rts-delay = <0 200>; // in milliseconds
};
# 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 Bindings
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>
allOf:
- $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: 1000
- 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: 1000
rs485-rts-active-low:
description: drive RTS low when sending (default is high).
$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
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