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drivers: serial: Implement serial wrapper to add DTR output #96578

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drivers: serial: Implement serial wrapper to add DTR output #96578

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1 change: 1 addition & 0 deletions drivers/serial/CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -32,6 +32,7 @@ zephyr_library_sources_ifdef(CONFIG_UART_CC23X0 uart_cc23x0.c)
zephyr_library_sources_ifdef(CONFIG_UART_CC32XX uart_cc32xx.c)
zephyr_library_sources_ifdef(CONFIG_UART_CDNS uart_cdns.c)
zephyr_library_sources_ifdef(CONFIG_UART_CMSDK_APB uart_cmsdk_apb.c)
zephyr_library_sources_ifdef(CONFIG_UART_DTR uart_dtr.c)
zephyr_library_sources_ifdef(CONFIG_UART_EFINIX_SAPPIHIRE uart_efinix_sapphire.c)
zephyr_library_sources_ifdef(CONFIG_UART_EMUL uart_emul.c)
zephyr_library_sources_ifdef(CONFIG_UART_ENE_KB106X uart_ene_kb106x.c)
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1 change: 1 addition & 0 deletions drivers/serial/Kconfig
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Expand Up @@ -173,6 +173,7 @@ rsource "Kconfig.cc23x0"
rsource "Kconfig.cc32xx"
rsource "Kconfig.cdns"
rsource "Kconfig.cmsdk_apb"
rsource "Kconfig.dtr"
rsource "Kconfig.efinix_sapphire"
rsource "Kconfig.emul"
rsource "Kconfig.ene"
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26 changes: 26 additions & 0 deletions drivers/serial/Kconfig.dtr
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@@ -0,0 +1,26 @@
# DTR wrapper UART configuration options

# Copyright (c) 2025 Nordic Semiconductor ASA
# SPDX-License-Identifier: Apache-2.0

config UART_DTR
bool "UART DTR wrapper driver"
default y
depends on DT_HAS_ZEPHYR_UART_DTR_ENABLED
depends on GPIO
depends on PM_DEVICE_RUNTIME
help
Enable UART DTR wrapper driver. This driver wraps an existing UART
device and adds DTR (Data Terminal Ready) functionality for runtime
power management. When UART is powered, the DTR signal is asserted,
and when the UART is powered down, the DTR signal is de-asserted.
The driver acts as a child node of the actual UART.

config UART_DTR_INIT_PRIORITY
int "UART DTR driver init priority"
default 60
depends on UART_DTR
help
UART DTR wrapper driver initialization priority. This should be
higher than the underlying UART driver but lower than devices
that depend on it. Generally set higher than CONFIG_UART_INIT_PRIORITY.
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