[openwrt/openwrt] kernel: make tty count for 8250 configurable

[LEDE Commits]

hauke pushed a commit to openwrt/openwrt.git, branch main:
https://git.openwrt.org/b93bb3dc629d50cd8885b8ee11e379e3b2a3c4b6

commit b93bb3dc629d50cd8885b8ee11e379e3b2a3c4b6
Author: Florian Eckert <fe at dev.tdt.de>
AuthorDate: Tue Mar 7 12:02:26 2023 +0100

    kernel: make tty count for 8250 configurable
    
    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 at dev.tdt.de>
    Link: https://github.com/openwrt/openwrt/pull/19217
    Signed-off-by: Hauke Mehrtens <hauke at hauke-m.de>
---
 package/kernel/linux/modules/other.mk | 27 +++++++++++++++++++++++++--
 1 file changed, 25 insertions(+), 2 deletions(-)

diff --git a/package/kernel/linux/modules/other.mk b/package/kernel/linux/modules/other.mk
index 53b1043a53..42c7ab06e8 100644
--- a/package/kernel/linux/modules/other.mk
+++ b/package/kernel/linux/modules/other.mk
@@ -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))