forked from Minki/linux
dce22df190
Hiding tristate options with "if EXPERT" is usually not a good idea.
You can decide that the driver should be included by default, but you
don't know if the user wants it built-in or as a module. Hiding the
option prevents the user from making that decision.
This is even more problematic when said option selects other options.
You end up with several device drivers forcibly built into the kernel.
In this specific case, drivers 8250_lpss, dw_dmac_core and
dw_dmac_pci end up being built-in as soon as SERIAL_8250=y. It is
very common for distribution kernels to build the subsystem core code
into the kernel, because almost everybody will need it, but build all
the device drivers as modules. This should be made possible.
So drop the "if EXPERT" and make SERIAL_8250_LPSS visible.
Signed-off-by: Jean Delvare <jdelvare@suse.de>
Fixes: a13e19cf3d ("serial: 8250_lpss: split LPSS driver to separate module")
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Jiri Slaby <jslaby@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
460 lines
16 KiB
Plaintext
460 lines
16 KiB
Plaintext
#
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# The 8250/16550 serial drivers. You shouldn't be in this list unless
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# you somehow have an implicit or explicit dependency on SERIAL_8250.
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#
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config SERIAL_8250
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tristate "8250/16550 and compatible serial support"
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select SERIAL_CORE
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---help---
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This selects whether you want to include the driver for the standard
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serial ports. The standard answer is Y. People who might say N
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here are those that are setting up dedicated Ethernet WWW/FTP
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servers, or users that have one of the various bus mice instead of a
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serial mouse and don't intend to use their machine's standard serial
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port for anything. (Note that the Cyclades multi serial port driver
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does not need this driver built in for it to work.)
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To compile this driver as a module, choose M here: the
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module will be called 8250.
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[WARNING: Do not compile this driver as a module if you are using
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non-standard serial ports, since the configuration information will
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be lost when the driver is unloaded. This limitation may be lifted
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in the future.]
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BTW1: If you have a mouseman serial mouse which is not recognized by
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the X window system, try running gpm first.
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BTW2: If you intend to use a software modem (also called Winmodem)
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under Linux, forget it. These modems are crippled and require
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proprietary drivers which are only available under Windows.
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Most people will say Y or M here, so that they can use serial mice,
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modems and similar devices connecting to the standard serial ports.
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config SERIAL_8250_DEPRECATED_OPTIONS
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bool "Support 8250_core.* kernel options (DEPRECATED)"
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depends on SERIAL_8250
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default y
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---help---
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In 3.7 we renamed 8250 to 8250_core by mistake, so now we have to
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accept kernel parameters in both forms like 8250_core.nr_uarts=4 and
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8250.nr_uarts=4. We now renamed the module back to 8250, but if
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anybody noticed in 3.7 and changed their userspace we still have to
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keep the 8250_core.* options around until they revert the changes
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they already did.
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If 8250 is built as a module, this adds 8250_core alias instead.
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If you did not notice yet and/or you have userspace from pre-3.7, it
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is safe (and recommended) to say N here.
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config SERIAL_8250_PNP
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bool "8250/16550 PNP device support" if EXPERT
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depends on SERIAL_8250 && PNP
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default y
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---help---
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This builds standard PNP serial support. You may be able to
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disable this feature if you only need legacy serial support.
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config SERIAL_8250_FINTEK
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bool "Support for Fintek F81216A LPC to 4 UART RS485 API"
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depends on SERIAL_8250
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---help---
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Selecting this option will add support for the RS485 capabilities
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of the Fintek F81216A LPC to 4 UART.
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If this option is not selected the device will be configured as a
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standard 16550A serial port.
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If unsure, say N.
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config SERIAL_8250_CONSOLE
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bool "Console on 8250/16550 and compatible serial port"
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depends on SERIAL_8250=y
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select SERIAL_CORE_CONSOLE
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select SERIAL_EARLYCON
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---help---
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If you say Y here, it will be possible to use a serial port as the
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system console (the system console is the device which receives all
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kernel messages and warnings and which allows logins in single user
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mode). This could be useful if some terminal or printer is connected
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to that serial port.
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Even if you say Y here, the currently visible virtual console
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(/dev/tty0) will still be used as the system console by default, but
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you can alter that using a kernel command line option such as
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"console=ttyS1". (Try "man bootparam" or see the documentation of
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your boot loader (grub or lilo or loadlin) about how to pass options
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to the kernel at boot time.)
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If you don't have a VGA card installed and you say Y here, the
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kernel will automatically use the first serial line, /dev/ttyS0, as
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system console.
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You can set that using a kernel command line option such as
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"console=uart8250,io,0x3f8,9600n8"
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"console=uart8250,mmio,0xff5e0000,115200n8".
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and it will switch to normal serial console when the corresponding
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port is ready.
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"earlycon=uart8250,io,0x3f8,9600n8"
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"earlycon=uart8250,mmio,0xff5e0000,115200n8".
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it will not only setup early console.
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If unsure, say N.
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config SERIAL_8250_GSC
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tristate
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depends on SERIAL_8250 && GSC
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default SERIAL_8250
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config SERIAL_8250_DMA
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bool "DMA support for 16550 compatible UART controllers" if EXPERT
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depends on SERIAL_8250 && DMADEVICES=y
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default SERIAL_8250
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help
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This builds DMA support that can be used with 8250/16650
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compatible UART controllers that support DMA signaling.
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config SERIAL_8250_PCI
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tristate "8250/16550 PCI device support"
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depends on SERIAL_8250 && PCI
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default SERIAL_8250
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help
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This builds standard PCI serial support. You may be able to
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disable this feature if you only need legacy serial support.
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Saves about 9K.
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Note that serial ports on NetMos 9835 Multi-I/O cards are handled
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by the parport_serial driver, enabled with CONFIG_PARPORT_SERIAL.
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config SERIAL_8250_HP300
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tristate
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depends on SERIAL_8250 && HP300
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default SERIAL_8250
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config SERIAL_8250_CS
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tristate "8250/16550 PCMCIA device support"
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depends on PCMCIA && SERIAL_8250
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---help---
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Say Y here to enable support for 16-bit PCMCIA serial devices,
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including serial port cards, modems, and the modem functions of
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multi-function Ethernet/modem cards. (PCMCIA- or PC-cards are
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credit-card size devices often used with laptops.)
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To compile this driver as a module, choose M here: the
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module will be called serial_cs.
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If unsure, say N.
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config SERIAL_8250_NR_UARTS
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int "Maximum number of 8250/16550 serial ports"
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depends on SERIAL_8250
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default "4"
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help
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Set this to the number of serial ports you want the driver
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to support. This includes any ports discovered via ACPI or
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PCI enumeration and any ports that may be added at run-time
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via hot-plug, or any ISA multi-port serial cards.
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config SERIAL_8250_RUNTIME_UARTS
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int "Number of 8250/16550 serial ports to register at runtime"
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depends on SERIAL_8250
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range 0 SERIAL_8250_NR_UARTS
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default "4"
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help
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Set this to the maximum number of serial ports you want
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the kernel to register at boot time. This can be overridden
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with the module parameter "nr_uarts", or boot-time parameter
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8250.nr_uarts
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config SERIAL_8250_EXTENDED
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bool "Extended 8250/16550 serial driver options"
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depends on SERIAL_8250
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help
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If you wish to use any non-standard features of the standard "dumb"
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driver, say Y here. This includes HUB6 support, shared serial
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interrupts, special multiport support, support for more than the
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four COM 1/2/3/4 boards, etc.
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Note that the answer to this question won't directly affect the
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kernel: saying N will just cause the configurator to skip all
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the questions about serial driver options. If unsure, say N.
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config SERIAL_8250_MANY_PORTS
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bool "Support more than 4 legacy serial ports"
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depends on SERIAL_8250_EXTENDED && !IA64
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help
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Say Y here if you have dumb serial boards other than the four
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standard COM 1/2/3/4 ports. This may happen if you have an AST
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FourPort, Accent Async, Boca (read the Boca mini-HOWTO, available
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from <http://www.tldp.org/docs.html#howto>), or other custom
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serial port hardware which acts similar to standard serial port
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hardware. If you only use the standard COM 1/2/3/4 ports, you can
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say N here to save some memory. You can also say Y if you have an
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"intelligent" multiport card such as Cyclades, Digiboards, etc.
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#
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# Multi-port serial cards
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#
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config SERIAL_8250_FOURPORT
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tristate "Support Fourport cards"
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depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
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help
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Say Y here if you have an AST FourPort serial board.
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To compile this driver as a module, choose M here: the module
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will be called 8250_fourport.
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config SERIAL_8250_ACCENT
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tristate "Support Accent cards"
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depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
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help
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Say Y here if you have an Accent Async serial board.
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To compile this driver as a module, choose M here: the module
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will be called 8250_accent.
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config SERIAL_8250_BOCA
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tristate "Support Boca cards"
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depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
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help
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Say Y here if you have a Boca serial board. Please read the Boca
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mini-HOWTO, available from <http://www.tldp.org/docs.html#howto>
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To compile this driver as a module, choose M here: the module
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will be called 8250_boca.
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config SERIAL_8250_EXAR_ST16C554
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tristate "Support Exar ST16C554/554D Quad UART"
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depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
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help
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The Uplogix Envoy TU301 uses this Exar Quad UART. If you are
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tinkering with your Envoy TU301, or have a machine with this UART,
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say Y here.
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To compile this driver as a module, choose M here: the module
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will be called 8250_exar_st16c554.
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config SERIAL_8250_HUB6
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tristate "Support Hub6 cards"
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depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
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help
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Say Y here if you have a HUB6 serial board.
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To compile this driver as a module, choose M here: the module
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will be called 8250_hub6.
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#
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# Misc. options/drivers.
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#
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config SERIAL_8250_SHARE_IRQ
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bool "Support for sharing serial interrupts"
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depends on SERIAL_8250_EXTENDED
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help
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Some serial boards have hardware support which allows multiple dumb
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serial ports on the same board to share a single IRQ. To enable
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support for this in the serial driver, say Y here.
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config SERIAL_8250_DETECT_IRQ
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bool "Autodetect IRQ on standard ports (unsafe)"
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depends on SERIAL_8250_EXTENDED
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help
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Say Y here if you want the kernel to try to guess which IRQ
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to use for your serial port.
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This is considered unsafe; it is far better to configure the IRQ in
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a boot script using the setserial command.
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If unsure, say N.
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config SERIAL_8250_RSA
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bool "Support RSA serial ports"
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depends on SERIAL_8250_EXTENDED
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help
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Say Y here if you have a IODATA RSA-DV II/S ISA card and
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would like to use its >115kbps speeds.
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You will need to provide module parameter "probe_rsa", or boot-time
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parameter 8250.probe_rsa with I/O addresses of this card then.
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If you don't have such card, or if unsure, say N.
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config SERIAL_8250_ACORN
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tristate "Acorn expansion card serial port support"
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depends on ARCH_ACORN && SERIAL_8250
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help
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If you have an Atomwide Serial card or Serial Port card for an Acorn
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system, say Y to this option. The driver can handle 1, 2, or 3 port
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cards. If unsure, say N.
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config SERIAL_8250_BCM2835AUX
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tristate "BCM2835 auxiliar mini UART support"
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depends on ARCH_BCM2835 || COMPILE_TEST
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depends on SERIAL_8250 && SERIAL_8250_SHARE_IRQ
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help
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Support for the BCM2835 auxiliar mini UART.
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Features and limitations of the UART are
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Registers are similar to 16650 registers,
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set bits in the control registers that are unsupported
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are ignored and read back as 0
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7/8 bit operation with 1 start and 1 stop bit
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8 symbols deep fifo for rx and tx
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SW controlled RTS and SW readable CTS
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Clock rate derived from system clock
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Uses 8 times oversampling (compared to 16 times for 16650)
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Missing break detection (but break generation)
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Missing framing error detection
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Missing parity bit
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Missing receive time-out interrupt
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Missing DCD, DSR, DTR and RI signals
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If unsure, say N.
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config SERIAL_8250_FSL
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bool
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depends on SERIAL_8250_CONSOLE
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default PPC || ARM || ARM64
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config SERIAL_8250_DW
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tristate "Support for Synopsys DesignWare 8250 quirks"
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depends on SERIAL_8250
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help
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Selecting this option will enable handling of the extra features
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present in the Synopsys DesignWare APB UART.
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config SERIAL_8250_EM
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tristate "Support for Emma Mobile integrated serial port"
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depends on SERIAL_8250 && ARM && HAVE_CLK
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help
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Selecting this option will add support for the integrated serial
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port hardware found on the Emma Mobile line of processors.
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If unsure, say N.
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config SERIAL_8250_RT288X
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bool "Ralink RT288x/RT305x/RT3662/RT3883 serial port support"
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depends on SERIAL_8250
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default y if MIPS_ALCHEMY || SOC_RT288X || SOC_RT305X || SOC_RT3883 || SOC_MT7620
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help
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Selecting this option will add support for the alternate register
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layout used by Ralink RT288x/RT305x, Alchemy Au1xxx, and some others.
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If unsure, say N.
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config SERIAL_8250_OMAP
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tristate "Support for OMAP internal UART (8250 based driver)"
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depends on SERIAL_8250 && ARCH_OMAP2PLUS
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help
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If you have a machine based on an Texas Instruments OMAP CPU you
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can enable its onboard serial ports by enabling this option.
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This driver uses ttyS instead of ttyO.
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config SERIAL_8250_OMAP_TTYO_FIXUP
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bool "Replace ttyO with ttyS"
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depends on SERIAL_8250_OMAP=y && SERIAL_8250_CONSOLE
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default y
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help
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This option replaces the "console=ttyO" argument with the matching
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ttyS argument if the user did not specified it on the command line.
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This ensures that the user can see the kernel output during boot
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which he wouldn't see otherwise. The getty has still to be configured
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for ttyS instead of ttyO regardless of this option.
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This option is intended for people who "automatically" enable this
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driver without knowing that this driver requires a different console=
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argument. If you read this, please keep this option disabled and
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instead update your kernel command line. If you prepare a kernel for a
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distribution or other kind of larger user base then you probably want
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to keep this option enabled. Otherwise people might complain about a
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not booting kernel because the serial console remains silent in case
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they forgot to update the command line.
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config SERIAL_8250_LPC18XX
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tristate "NXP LPC18xx/43xx serial port support"
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depends on SERIAL_8250 && OF && (ARCH_LPC18XX || COMPILE_TEST)
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default ARCH_LPC18XX
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help
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If you have a LPC18xx/43xx based board and want to use the
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serial port, say Y to this option. If unsure, say Y.
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config SERIAL_8250_MT6577
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tristate "Mediatek serial port support"
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depends on SERIAL_8250 && ARCH_MEDIATEK
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help
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If you have a Mediatek based board and want to use the
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serial port, say Y to this option. If unsure, say N.
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config SERIAL_8250_UNIPHIER
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tristate "Support for UniPhier on-chip UART"
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depends on SERIAL_8250
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depends on ARCH_UNIPHIER || COMPILE_TEST
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help
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If you have a UniPhier based board and want to use the on-chip
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serial ports, say Y to this option. If unsure, say N.
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config SERIAL_8250_INGENIC
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tristate "Support for Ingenic SoC serial ports"
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depends on SERIAL_8250
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depends on OF_FLATTREE
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depends on MIPS || COMPILE_TEST
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help
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If you have a system using an Ingenic SoC and wish to make use of
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its UARTs, say Y to this option. If unsure, say N.
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config SERIAL_8250_LPSS
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tristate "Support for serial ports on Intel LPSS platforms"
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default SERIAL_8250
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depends on SERIAL_8250 && PCI
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depends on X86 || COMPILE_TEST
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select DW_DMAC_CORE if SERIAL_8250_DMA
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select DW_DMAC_PCI if (SERIAL_8250_DMA && X86_INTEL_LPSS)
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select RATIONAL
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help
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Selecting this option will enable handling of the extra features
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present on the UART found on various Intel platforms such as:
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- Intel Baytrail SoC
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- Intel Braswell SoC
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- Intel Quark X1000 SoC
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config SERIAL_8250_MID
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tristate "Support for serial ports on Intel MID platforms" if EXPERT
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default SERIAL_8250
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depends on SERIAL_8250 && PCI
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depends on X86 || COMPILE_TEST
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select HSU_DMA if SERIAL_8250_DMA
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select HSU_DMA_PCI if (HSU_DMA && X86_INTEL_MID)
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select RATIONAL
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help
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Selecting this option will enable handling of the extra features
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present on the UART found on Intel Medfield SOC and various other
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Intel platforms.
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config SERIAL_8250_MOXA
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tristate "MOXA SmartIO MUE support"
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depends on SERIAL_8250 && PCI
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help
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Say Y here if you have a Moxa SmartIO MUE multiport serial card.
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If unsure, say N.
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This driver can also be built as a module. The module will be called
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8250_moxa. If you want to do that, say M here.
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config SERIAL_8250_PXA
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tristate "PXA serial port support"
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depends on SERIAL_8250
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depends on ARCH_PXA || ARCH_MMP
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help
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If you have a machine based on an Intel XScale PXA2xx CPU you can
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enable its onboard serial ports by enabling this option. The option is
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applicable to both devicetree and legacy boards, and early console is
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part of its support.
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config SERIAL_OF_PLATFORM
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tristate "Devicetree based probing for 8250 ports"
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depends on SERIAL_8250 && OF
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help
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This option is used for all 8250 compatible serial ports that
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are probed through devicetree, including Open Firmware based
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PowerPC systems and embedded systems on architectures using the
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flattened device tree format.
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