path: root/drivers/tty/serial/Kconfig

# SPDX-License-Identifier: GPL-2.0
#
# Serial device configuration
#

if TTY

menu "Serial drivers"
	depends on HAS_IOMEM

config SERIAL_EARLYCON
	bool
	depends on SERIAL_CORE
	help
	  Support for early consoles with the earlycon parameter. This enables
	  the console before standard serial driver is probed. The console is
	  enabled when early_param is processed.

source "drivers/tty/serial/8250/Kconfig"

comment "Non-8250 serial port support"

config SERIAL_AMBA_PL010
	tristate "ARM AMBA PL010 serial port support"
	depends on ARM_AMBA
	select SERIAL_CORE
	help
	  This selects the ARM(R) AMBA(R) PrimeCell PL010 UART.  If you have
	  an Integrator/AP or Integrator/PP2 platform, or if you have a
	  Cirrus Logic EP93xx CPU, say Y or M here.

	  If unsure, say N.

config SERIAL_AMBA_PL010_CONSOLE
	bool "Support for console on AMBA serial port"
	depends on SERIAL_AMBA_PL010=y
	select SERIAL_CORE_CONSOLE
	---help---
	  Say Y here if you wish to use an AMBA PrimeCell UART as the system
	  console (the system console is the device which receives all kernel
	  messages and warnings and which allows logins in single user mode).

	  Even if you say Y here, the currently visible framebuffer console
	  (/dev/tty0) will still be used as the system console by default, but
	  you can alter that using a kernel command line option such as
	  "console=ttyAM0". (Try "man bootparam" or see the documentation of
	  your boot loader (lilo or loadlin) about how to pass options to the
	  kernel at boot time.)

config SERIAL_AMBA_PL011
	tristate "ARM AMBA PL011 serial port support"
	depends on ARM_AMBA
	select SERIAL_CORE
	help
	  This selects the ARM(R) AMBA(R) PrimeCell PL011 UART.  If you have
	  an Integrator/PP2, Integrator/CP or Versatile platform, say Y or M
	  here.

	  If unsure, say N.

config SERIAL_AMBA_PL011_CONSOLE
	bool "Support for console on AMBA serial port"
	depends on SERIAL_AMBA_PL011=y
	select SERIAL_CORE_CONSOLE
	select SERIAL_EARLYCON
	---help---
	  Say Y here if you wish to use an AMBA PrimeCell UART as the system
	  console (the system console is the device which receives all kernel
	  messages and warnings and which allows logins in single user mode).

	  Even if you say Y here, the currently visible framebuffer console
	  (/dev/tty0) will still be used as the system console by default, but
	  you can alter that using a kernel command line option such as
	  "console=ttyAMA0". (Try "man bootparam" or see the documentation of
	  your boot loader (lilo or loadlin) about how to pass options to the
	  kernel at boot time.)

config SERIAL_EARLYCON_ARM_SEMIHOST
	bool "Early console using ARM semihosting"
	depends on ARM64 || ARM
	select SERIAL_CORE
	select SERIAL_CORE_CONSOLE
	select SERIAL_EARLYCON
	help
	  Support for early debug console using ARM semihosting. This enables
	  the console before standard serial driver is probed. This is enabled
	  with "earlycon=smh" on the kernel command line. The console is
	  enabled when early_param is processed.

config SERIAL_EARLYCON_RISCV_SBI
	bool "Early console using RISC-V SBI"
	depends on RISCV
	select SERIAL_CORE
	select SERIAL_CORE_CONSOLE
	select SERIAL_EARLYCON
	help
	  Support for early debug console using RISC-V SBI. This enables
	  the console before standard serial driver is probed. This is enabled
	  with "earlycon=sbi" on the kernel command line. The console is
	  enabled when early_param is processed.

config SERIAL_SB1250_DUART
	tristate "BCM1xxx on-chip DUART serial support"
	depends on SIBYTE_SB1xxx_SOC=y
	select SERIAL_CORE
	default y
	---help---
	  Support for the asynchronous serial interface (DUART) included in
	  the BCM1250 and derived System-On-a-Chip (SOC) devices.  Note that
	  the letter D in DUART stands for "dual", which is how the device
	  is implemented.  Depending on the SOC configuration there may be
	  one or more DUARTs available of which all are handled.

	  If unsure, say Y.  To compile this driver as a module, choose M here:
	  the module will be called sb1250-duart.

config SERIAL_SB1250_DUART_CONSOLE
	bool "Support for console on a BCM1xxx DUART serial port"
	depends on SERIAL_SB1250_DUART=y
	select SERIAL_CORE_CONSOLE
	default y
	---help---
	  If you say Y here, it will be possible to use a serial port as the
	  system console (the system console is the device which receives all
	  kernel messages and warnings and which allows logins in single user
	  mode).

	  If unsure, say Y.

config SERIAL_ATMEL
	bool "AT91 on-chip serial port support"
	depends on ARCH_AT91 || COMPILE_TEST
	select SERIAL_CORE
	select SERIAL_MCTRL_GPIO if GPIOLIB
	select MFD_AT91_USART
	help
	  This enables the driver for the on-chip UARTs of the Atmel
	  AT91 processors.

config SERIAL_ATMEL_CONSOLE
	bool "Support for console on AT91 serial port"
	depends on SERIAL_ATMEL=y
	select SERIAL_CORE_CONSOLE
	help
	  Say Y here if you wish to use an on-chip UART on a Atmel
	  AT91 processor as the system console (the system
	  console is the device which receives all kernel messages and
	  warnings and which allows logins in single user mode).

config SERIAL_ATMEL_PDC
	bool "Support DMA transfers on AT91 serial port"
	depends on SERIAL_ATMEL
	default y
	help
	  Say Y here if you wish to use the PDC to do DMA transfers to
	  and from the Atmel AT91 serial port. In order to
	  actually use DMA transfers, make sure that the use_dma_tx
	  and use_dma_rx members in the atmel_uart_data struct is set
	  appropriately for each port.

	  Note that break and error handling currently doesn't work
	  properly when DMA is enabled. Make sure that ports where
	  this matters don't use DMA.

config SERIAL_ATMEL_TTYAT
	bool "Install as device ttyATn instead of ttySn"
	depends on SERIAL_ATMEL=y
	help
	  Say Y here if you wish to have the internal AT91 UARTs
	  appear as /dev/ttyATn (major 204, minor starting at 154)
	  instead of the normal /dev/ttySn (major 4, minor starting at
	  64). This is necessary if you also wa