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kernel: make tty count for 8250 configurable

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The number of serial interfaces for the chip 8250 can be configured at
build time. This is currently not configurable and is always set to 16
interfaces. This is too little for some small embedded devices and too much
for others (x86_64). Therefore, this commit creates the possibility to set
this at compile time.

Signed-off-by: Florian Eckert <fe@dev.tdt.de>
Link: https://github.com/openwrt/openwrt/pull/19217
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
This commit is contained in:
Florian Eckert 2023-03-07 12:02:26 +01:00 committed by Hauke Mehrtens
parent 1c6cb6d5be
commit b93bb3dc62
1 changed files with 25 additions and 2 deletions
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27
package/kernel/linux/modules/other.mk
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@ -566,8 +566,6 @@ define KernelPackage/serial-8250
DEPENDS:=@!TARGET_uml
KCONFIG:= CONFIG_SERIAL_8250 \
CONFIG_SERIAL_8250_PCI \
CONFIG_SERIAL_8250_NR_UARTS=16 \
CONFIG_SERIAL_8250_RUNTIME_UARTS=16 \
CONFIG_SERIAL_8250_EXTENDED=y \
CONFIG_SERIAL_8250_MANY_PORTS=y \
CONFIG_SERIAL_8250_SHARE_IRQ=y \
@ -585,6 +583,31 @@ define KernelPackage/serial-8250/description
Kernel module for 8250 UART based serial ports
endef
define KernelPackage/serial-8250/config
menu "Configuration"
depends on PACKAGE_kmod-serial-8250
config KERNEL_SERIAL_8250_NR_UARTS
int "Maximum number of 8250/16550 serial ports"
default "16"
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 KERNEL_SERIAL_8250_RUNTIME_UARTS
int "Number of 8250/16550 serial ports to register at runtime"
range 0 KERNEL_SERIAL_8250_NR_UARTS
default "16"
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
endmenu
endef
$(eval $(call KernelPackage,serial-8250))