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# Copyright (c) 2020 STMICROELECTRONICS
# SPDX-License-Identifier: Apache-2.0
# Common fields for STM32 UART peripherals.
description: STM32 UART-BASE
include:
- name: uart-controller.yaml
property-blocklist:
- clock-frequency
- name: pinctrl-device.yaml
- name: reset-device.yaml
properties:
reg:
required: true
clocks:
required: true
resets:
required: true
interrupts:
required: true
single-wire:
type: boolean
description: |
Enable the single wire half-duplex communication.
Using this mode, TX and RX lines are internally connected and
only TX pin is used afterwards and should be configured.
RX/TX conflicts must be handled on user side.
tx-rx-swap:
type: boolean
description:
Swap the TX and RX pins. Used in case of a cross wired connection.
tx-invert:
type: boolean
description: |
Invert the binary logic of tx pin. When enabled, physical logic levels are inverted and
we use 1=Low, 0=High instead of 1=High, 0=Low.
rx-invert:
type: boolean
description: |
Invert the binary logic of rx pin. When enabled, physical logic levels are inverted and
we use 1=Low, 0=High instead of 1=High, 0=Low.
pinctrl-0:
required: true
pinctrl-names:
required: true
wakeup-line:
type: int
description: |
EXTI line number matching the device wakeup interrupt mask register.
This property is required on stm32 devices where the wakeup interrupt signal could be
configured masked at boot (sm32wl55 for instance), preventing the device to wakeup
the core from stop mode(s).
Valid range: 0 - 31
de-enable:
type: boolean
description: |
Enable activating an external transeiver through the DE pin which must also be configured
using pinctrl.
de-assert-time:
type: int
default: 0
description: |
Defines the time between the activation of the DE signal and the beginning of the start bit.
It is expressed in 16th of a bit time.
Valid range: 0 - 31
de-deassert-time:
type: int
default: 0
description: |
Defines the time between the activation of the DE signal and the beginning of the start bit.
It is expressed in 16th of a bit time.
Valid range: 0 - 31
de-invert:
type: boolean
description: |
Invert the binary logic of the de pin. When enabled, physical logic levels are inverted and
we use 1=Low, 0=High instead of 1=High, 0=Low.
fifo-enable:
type: boolean
description: |
Enables transmit and receive FIFO using default FIFO configuration (typically threshold is
set to 1/8).
In TX, FIFO allows to work in burst mode, easing scheduling of loaded applications. It also
allows more reliable communication with UART devices sensitive to variation of inter-frames
delays.
In RX, FIFO reduces overrun occurrences.