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+# SPDX-License-Identifier: GPL-2.0
+#
+# The 8250/16550 serial drivers. You shouldn't be in this list unless
+# you somehow have an implicit or explicit dependency on SERIAL_8250.
+#
+
+config SERIAL_8250
+ tristate "8250/16550 and compatible serial support"
+ depends on !S390
+ select SERIAL_CORE
+ select SERIAL_MCTRL_GPIO if GPIOLIB
+ help
+ This selects whether you want to include the driver for the standard
+ serial ports. The standard answer is Y. People who might say N
+ here are those that are setting up dedicated Ethernet WWW/FTP
+ servers, or users that have one of the various bus mice instead of a
+ serial mouse and don't intend to use their machine's standard serial
+ port for anything.
+
+ To compile this driver as a module, choose M here: the
+ module will be called 8250.
+ [WARNING: Do not compile this driver as a module if you are using
+ non-standard serial ports, since the configuration information will
+ be lost when the driver is unloaded. This limitation may be lifted
+ in the future.]
+
+ BTW1: If you have a mouseman serial mouse which is not recognized by
+ the X window system, try running gpm first.
+
+ BTW2: If you intend to use a software modem (also called Winmodem)
+ under Linux, forget it. These modems are crippled and require
+ proprietary drivers which are only available under Windows.
+
+ Most people will say Y or M here, so that they can use serial mice,
+ modems and similar devices connecting to the standard serial ports.
+
+config SERIAL_8250_DEPRECATED_OPTIONS
+ bool "Support 8250_core.* kernel options (DEPRECATED)"
+ depends on SERIAL_8250
+ default y
+ help
+ In 3.7 we renamed 8250 to 8250_core by mistake, so now we have to
+ accept kernel parameters in both forms like 8250_core.nr_uarts=4 and
+ 8250.nr_uarts=4. We now renamed the module back to 8250, but if
+ anybody noticed in 3.7 and changed their userspace we still have to
+ keep the 8250_core.* options around until they revert the changes
+ they already did.
+
+ If 8250 is built as a module, this adds 8250_core alias instead.
+
+ If you did not notice yet and/or you have userspace from pre-3.7, it
+ is safe (and recommended) to say N here.
+
+config SERIAL_8250_PNP
+ bool "8250/16550 PNP device support" if EXPERT
+ depends on SERIAL_8250 && PNP
+ default y
+ help
+ This builds standard PNP serial support. You may be able to
+ disable this feature if you only need legacy serial support.
+
+config SERIAL_8250_16550A_VARIANTS
+ bool "Support for variants of the 16550A serial port"
+ depends on SERIAL_8250
+ default !X86
+ help
+ The 8250 driver can probe for many variants of the venerable 16550A
+ serial port. Doing so takes additional time at boot.
+
+ On modern systems, especially those using serial only for a simple
+ console, you can say N here.
+
+config SERIAL_8250_FINTEK
+ bool "Support for Fintek F81216A LPC to 4 UART RS485 API"
+ depends on SERIAL_8250
+ help
+ Selecting this option will add support for the RS485 capabilities
+ of the Fintek F81216A LPC to 4 UART.
+
+ If this option is not selected the device will be configured as a
+ standard 16550A serial port.
+
+ If unsure, say N.
+
+config SERIAL_8250_CONSOLE
+ bool "Console on 8250/16550 and compatible serial port"
+ depends on SERIAL_8250=y
+ select SERIAL_CORE_CONSOLE
+ select SERIAL_EARLYCON
+ 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). This could be useful if some terminal or printer is connected
+ to that serial port.
+
+ Even if you say Y here, the currently visible virtual 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=ttyS1". (Try "man bootparam" or see the documentation of
+ your boot loader (grub or lilo or loadlin) about how to pass options
+ to the kernel at boot time.)
+
+ If you don't have a VGA card installed and you say Y here, the
+ kernel will automatically use the first serial line, /dev/ttyS0, as
+ system console.
+
+ You can set that using a kernel command line option such as
+ "console=uart8250,io,0x3f8,9600n8"
+ "console=uart8250,mmio,0xff5e0000,115200n8".
+ and it will switch to normal serial console when the corresponding
+ port is ready.
+ "earlycon=uart8250,io,0x3f8,9600n8"
+ "earlycon=uart8250,mmio,0xff5e0000,115200n8".
+ it will not only setup early console.
+
+ If unsure, say N.
+
+config SERIAL_8250_PARISC
+ tristate
+ depends on SERIAL_8250 && PARISC
+ default SERIAL_8250
+
+config SERIAL_8250_DMA
+ bool "DMA support for 16550 compatible UART controllers" if EXPERT
+ depends on SERIAL_8250 && DMADEVICES=y
+ default SERIAL_8250
+ help
+ This builds DMA support that can be used with 8250/16650
+ compatible UART controllers that support DMA signaling.
+
+config SERIAL_8250_PCI
+ tristate "8250/16550 PCI device support"
+ depends on SERIAL_8250 && PCI
+ default SERIAL_8250
+ help
+ This builds standard PCI serial support. You may be able to
+ disable this feature if you only need legacy serial support.
+ Saves about 9K.
+ Note that serial ports on NetMos 9835 Multi-I/O cards are handled
+ by the parport_serial driver, enabled with CONFIG_PARPORT_SERIAL.
+
+config SERIAL_8250_EXAR
+ tristate "8250/16550 Exar/Commtech PCI/PCIe device support"
+ depends on SERIAL_8250_PCI
+ default SERIAL_8250
+ help
+ This builds support for XR17C1xx, XR17V3xx and some Commtech
+ 422x PCIe serial cards that are not covered by the more generic
+ SERIAL_8250_PCI option.
+
+config SERIAL_8250_HP300
+ tristate
+ depends on SERIAL_8250 && HP300
+ default SERIAL_8250
+
+config SERIAL_8250_CS
+ tristate "8250/16550 PCMCIA device support"
+ depends on PCMCIA && SERIAL_8250
+ help
+ Say Y here to enable support for 16-bit PCMCIA serial devices,
+ including serial port cards, modems, and the modem functions of
+ multi-function Ethernet/modem cards. (PCMCIA- or PC-cards are
+ credit-card size devices often used with laptops.)
+
+ To compile this driver as a module, choose M here: the
+ module will be called serial_cs.
+
+ If unsure, say N.
+
+config SERIAL_8250_MEN_MCB
+ tristate "MEN MCB UART device support"
+ depends on MCB && SERIAL_8250
+ help
+ This enables support for FPGA based UARTs found on many MEN
+ boards. This driver enables support for the 16z025, 16z057
+ and 16z125 UARTs.
+
+ To compile this driver as a module, chose M here: the
+ module will be called 8250_men_mcb.
+
+
+config SERIAL_8250_NR_UARTS
+ int "Maximum number of 8250/16550 serial ports"
+ depends on SERIAL_8250
+ default "4"
+ help
+ Set this to the number of serial ports you want the driver
+ to support. This includes any ports discovered via ACPI or
+ PCI enumeration and any ports that may be added at run-time
+ via hot-plug, or any ISA multi-port serial cards.
+
+config SERIAL_8250_RUNTIME_UARTS
+ int "Number of 8250/16550 serial ports to register at runtime"
+ depends on SERIAL_8250
+ range 0 SERIAL_8250_NR_UARTS
+ default "4"
+ help
+ Set this to the maximum number of serial ports you want
+ the kernel to register at boot time. This can be overridden
+ with the module parameter "nr_uarts", or boot-time parameter
+ 8250.nr_uarts
+
+config SERIAL_8250_EXTENDED
+ bool "Extended 8250/16550 serial driver options"
+ depends on SERIAL_8250
+ help
+ If you wish to use any non-standard features of the standard "dumb"
+ driver, say Y here. This includes HUB6 support, shared serial
+ interrupts, special multiport support, support for more than the
+ four COM 1/2/3/4 boards, etc.
+
+ Note that the answer to this question won't directly affect the
+ kernel: saying N will just cause the configurator to skip all
+ the questions about serial driver options. If unsure, say N.
+
+config SERIAL_8250_MANY_PORTS
+ bool "Support more than 4 legacy serial ports"
+ depends on SERIAL_8250_EXTENDED && !IA64
+ help
+ Say Y here if you have dumb serial boards other than the four
+ standard COM 1/2/3/4 ports. This may happen if you have an AST
+ FourPort, Accent Async, Boca (read the Boca mini-HOWTO, available
+ from <https://www.tldp.org/docs.html#howto>), or other custom
+ serial port hardware which acts similar to standard serial port
+ hardware. If you only use the standard COM 1/2/3/4 ports, you can
+ say N here to save some memory. You can also say Y if you have an
+ "intelligent" multiport card such as Digiboards, etc.
+
+#
+# Multi-port serial cards
+#
+
+config SERIAL_8250_FOURPORT
+ tristate "Support Fourport cards"
+ depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
+ help
+ Say Y here if you have an AST FourPort serial board.
+
+ To compile this driver as a module, choose M here: the module
+ will be called 8250_fourport.
+
+config SERIAL_8250_ACCENT
+ tristate "Support Accent cards"
+ depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
+ help
+ Say Y here if you have an Accent Async serial board.
+
+ To compile this driver as a module, choose M here: the module
+ will be called 8250_accent.
+
+config SERIAL_8250_ASPEED_VUART
+ tristate "Aspeed Virtual UART"
+ depends on SERIAL_8250
+ depends on OF
+ depends on MFD_SYSCON
+ depends on ARCH_ASPEED || COMPILE_TEST
+ select REGMAP
+ help
+ If you want to use the virtual UART (VUART) device on Aspeed
+ BMC platforms, enable this option. This enables the 16550A-
+ compatible device on the local LPC bus, giving a UART device
+ with no physical RS232 connections.
+
+config SERIAL_8250_BOCA
+ tristate "Support Boca cards"
+ depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
+ help
+ Say Y here if you have a Boca serial board. Please read the Boca
+ mini-HOWTO, available from <https://www.tldp.org/docs.html#howto>
+
+ To compile this driver as a module, choose M here: the module
+ will be called 8250_boca.
+
+config SERIAL_8250_EXAR_ST16C554
+ tristate "Support Exar ST16C554/554D Quad UART"
+ depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
+ help
+ The Uplogix Envoy TU301 uses this Exar Quad UART. If you are
+ tinkering with your Envoy TU301, or have a machine with this UART,
+ say Y here.
+
+ To compile this driver as a module, choose M here: the module
+ will be called 8250_exar_st16c554.
+
+config SERIAL_8250_HUB6
+ tristate "Support Hub6 cards"
+ depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
+ help
+ Say Y here if you have a HUB6 serial board.
+
+ To compile this driver as a module, choose M here: the module
+ will be called 8250_hub6.
+
+#
+# Misc. options/drivers.
+#
+
+config SERIAL_8250_SHARE_IRQ
+ bool "Support for sharing serial interrupts"
+ depends on SERIAL_8250_EXTENDED
+ help
+ Some serial boards have hardware support which allows multiple dumb
+ serial ports on the same board to share a single IRQ. To enable
+ support for this in the serial driver, say Y here.
+
+config SERIAL_8250_DETECT_IRQ
+ bool "Autodetect IRQ on standard ports (unsafe)"
+ depends on SERIAL_8250_EXTENDED
+ help
+ Say Y here if you want the kernel to try to guess which IRQ
+ to use for your serial port.
+
+ This is considered unsafe; it is far better to configure the IRQ in
+ a boot script using the setserial command.
+
+ If unsure, say N.
+
+config SERIAL_8250_RSA
+ bool "Support RSA serial ports"
+ depends on SERIAL_8250_EXTENDED
+ help
+ Say Y here if you have a IODATA RSA-DV II/S ISA card and
+ would like to use its >115kbps speeds.
+ You will need to provide module parameter "probe_rsa", or boot-time
+ parameter 8250.probe_rsa with I/O addresses of this card then.
+
+ If you don't have such card, or if unsure, say N.
+
+config SERIAL_8250_DWLIB
+ bool
+
+config SERIAL_8250_ACORN
+ tristate "Acorn expansion card serial port support"
+ depends on ARCH_ACORN && SERIAL_8250
+ help
+ If you have an Atomwide Serial card or Serial Port card for an Acorn
+ system, say Y to this option. The driver can handle 1, 2, or 3 port
+ cards. If unsure, say N.
+
+config SERIAL_8250_BCM2835AUX
+ tristate "BCM2835 auxiliar mini UART support"
+ depends on ARCH_BCM2835 || COMPILE_TEST
+ depends on SERIAL_8250 && SERIAL_8250_SHARE_IRQ
+ help
+ Support for the BCM2835 auxiliar mini UART.
+
+ Features and limitations of the UART are
+ Registers are similar to 16650 registers,
+ set bits in the control registers that are unsupported
+ are ignored and read back as 0
+ 7/8 bit operation with 1 start and 1 stop bit
+ 8 symbols deep fifo for rx and tx
+ SW controlled RTS and SW readable CTS
+ Clock rate derived from system clock
+ Uses 8 times oversampling (compared to 16 times for 16650)
+ Missing break detection (but break generation)
+ Missing framing error detection
+ Missing parity bit
+ Missing receive time-out interrupt
+ Missing DCD, DSR, DTR and RI signals
+
+ If unsure, say N.
+
+config SERIAL_8250_FSL
+ bool "Freescale 16550 UART support" if COMPILE_TEST && !(PPC || ARM || ARM64)
+ depends on SERIAL_8250_CONSOLE
+ default PPC || ARM || ARM64
+ help
+ Selecting this option enables a workaround for a break-detection
+ erratum for Freescale 16550 UARTs in the 8250 driver. It also
+ enables support for ACPI enumeration.
+
+config SERIAL_8250_DW
+ tristate "Support for Synopsys DesignWare 8250 quirks"
+ depends on SERIAL_8250
+ select SERIAL_8250_DWLIB
+ help
+ Selecting this option will enable handling of the extra features
+ present in the Synopsys DesignWare APB UART.
+
+config SERIAL_8250_EM
+ tristate "Support for Emma Mobile integrated serial port"
+ depends on SERIAL_8250 && HAVE_CLK
+ depends on ARCH_RENESAS || COMPILE_TEST
+ help
+ Selecting this option will add support for the integrated serial
+ port hardware found on the Emma Mobile line of processors.
+ If unsure, say N.
+
+config SERIAL_8250_IOC3
+ tristate "SGI IOC3 8250 UART support"
+ depends on SERIAL_8250
+ depends on SGI_MFD_IOC3 || COMPILE_TEST
+ select SERIAL_8250_EXTENDED
+ select SERIAL_8250_SHARE_IRQ
+ help
+ Enable this if you have a SGI Origin or Octane machine. This module
+ provides basic serial support by directly driving the UART chip
+ behind the IOC3 device on those systems. Maximum baud speed is
+ 38400bps using this driver.
+
+config SERIAL_8250_RT288X
+ bool "Ralink RT288x/RT305x/RT3662/RT3883 serial port support"
+ depends on SERIAL_8250
+ default y if MIPS_ALCHEMY || SOC_RT288X || SOC_RT305X || SOC_RT3883 || SOC_MT7620
+ help
+ Selecting this option will add support for the alternate register
+ layout used by Ralink RT288x/RT305x, Alchemy Au1xxx, and some others.
+ If unsure, say N.
+
+config SERIAL_8250_OMAP
+ tristate "Support for OMAP internal UART (8250 based driver)"
+ depends on SERIAL_8250
+ depends on ARCH_OMAP2PLUS || ARCH_K3 || COMPILE_TEST
+ help
+ If you have a machine based on an Texas Instruments OMAP CPU you
+ can enable its onboard serial ports by enabling this option.
+
+ This driver uses ttyS instead of ttyO.
+
+config SERIAL_8250_OMAP_TTYO_FIXUP
+ bool "Replace ttyO with ttyS"
+ depends on SERIAL_8250_OMAP=y && SERIAL_8250_CONSOLE
+ default y
+ help
+ This option replaces the "console=ttyO" argument with the matching
+ ttyS argument if the user did not specified it on the command line.
+ This ensures that the user can see the kernel output during boot
+ which he wouldn't see otherwise. The getty has still to be configured
+ for ttyS instead of ttyO regardless of this option.
+ This option is intended for people who "automatically" enable this
+ driver without knowing that this driver requires a different console=
+ argument. If you read this, please keep this option disabled and
+ instead update your kernel command line. If you prepare a kernel for a
+ distribution or other kind of larger user base then you probably want
+ to keep this option enabled. Otherwise people might complain about a
+ not booting kernel because the serial console remains silent in case
+ they forgot to update the command line.
+
+config SERIAL_8250_LPC18XX
+ tristate "NXP LPC18xx/43xx serial port support"
+ depends on SERIAL_8250 && OF && (ARCH_LPC18XX || COMPILE_TEST)
+ default ARCH_LPC18XX
+ help
+ If you have a LPC18xx/43xx based board and want to use the
+ serial port, say Y to this option. If unsure, say Y.
+
+config SERIAL_8250_MT6577
+ tristate "Mediatek serial port support"
+ depends on SERIAL_8250
+ depends on ARCH_MEDIATEK || COMPILE_TEST
+ help
+ If you have a Mediatek based board and want to use the
+ serial port, say Y to this option. If unsure, say N.
+
+config SERIAL_8250_UNIPHIER
+ tristate "Support for UniPhier on-chip UART"
+ depends on SERIAL_8250
+ depends on ARCH_UNIPHIER || COMPILE_TEST
+ help
+ If you have a UniPhier based board and want to use the on-chip
+ serial ports, say Y to this option. If unsure, say N.
+
+config SERIAL_8250_INGENIC
+ tristate "Support for Ingenic SoC serial ports"
+ depends on SERIAL_8250
+ depends on OF_FLATTREE
+ depends on MIPS || COMPILE_TEST
+ help
+ If you have a system using an Ingenic SoC and wish to make use of
+ its UARTs, say Y to this option. If unsure, say N.
+
+config SERIAL_8250_LPSS
+ tristate "Support for serial ports on Intel LPSS platforms"
+ default SERIAL_8250
+ depends on SERIAL_8250 && PCI
+ depends on X86 || COMPILE_TEST
+ select SERIAL_8250_DWLIB
+ select DW_DMAC_CORE if SERIAL_8250_DMA
+ select DW_DMAC_PCI if (SERIAL_8250_DMA && X86_INTEL_LPSS)
+ select RATIONAL
+ help
+ Selecting this option will enable handling of the UART found on
+ various Intel platforms such as:
+ - Intel Baytrail SoC
+ - Intel Braswell SoC
+ - Intel Quark X1000 SoC
+ that are not covered by the more generic SERIAL_8250_PCI option.
+
+config SERIAL_8250_MID
+ tristate "Support for serial ports on Intel MID platforms"
+ default SERIAL_8250
+ depends on SERIAL_8250 && PCI
+ depends on X86 || COMPILE_TEST
+ select HSU_DMA if SERIAL_8250_DMA
+ select HSU_DMA_PCI if (HSU_DMA && X86_INTEL_MID)
+ select RATIONAL
+ help
+ Selecting this option will enable handling of the UART found on
+ Intel Medfield SOC and various other Intel platforms that is not
+ covered by the more generic SERIAL_8250_PCI option.
+
+config SERIAL_8250_PERICOM
+ tristate "Support for Pericom and Acces I/O serial ports"
+ default SERIAL_8250
+ depends on SERIAL_8250 && PCI
+ help
+ Selecting this option will enable handling of the Pericom and Acces
+ I/O UARTs that are not covered by the more generic SERIAL_8250_PCI
+ option.
+
+config SERIAL_8250_PXA
+ tristate "PXA serial port support"
+ depends on SERIAL_8250
+ depends on ARCH_PXA || ARCH_MMP || COMPILE_TEST
+ help
+ If you have a machine based on an Intel XScale PXA2xx CPU you can
+ enable its onboard serial ports by enabling this option. The option is
+ applicable to both devicetree and legacy boards, and early console is
+ part of its support.
+
+config SERIAL_8250_TEGRA
+ tristate "8250 support for Tegra serial ports"
+ default SERIAL_8250
+ depends on SERIAL_8250
+ depends on ARCH_TEGRA || COMPILE_TEST
+ help
+ Select this option if you have machine with an NVIDIA Tegra SoC and
+ wish to enable 8250 serial driver for the Tegra serial interfaces.
+
+config SERIAL_8250_BCM7271
+ tristate "Broadcom 8250 based serial port"
+ depends on SERIAL_8250 && (ARCH_BRCMSTB || COMPILE_TEST)
+ default ARCH_BRCMSTB
+ help
+ If you have a Broadcom STB based board and want to use the
+ enhanced features of the Broadcom 8250 based serial port,
+ including DMA support and high accuracy BAUD rates, say
+ Y to this option. If unsure, say N.
+
+config SERIAL_OF_PLATFORM
+ tristate "Devicetree based probing for 8250 ports"
+ depends on SERIAL_8250 && OF
+ help
+ This option is used for all 8250 compatible serial ports that
+ are probed through devicetree, including Open Firmware based
+ PowerPC systems and embedded systems on architectures using the
+ flattened device tree format.