[SERIAL] Make the number of UARTs registered configurable.

Also add a nr_uarts module option to the 8250 code to override
this, up to a maximum of CONFIG_SERIAL_8250_NR_UARTS

This should appease people who complain about a proliferation
of /dev/ttyS & /sysfs nodes whilst at the same time allowing
a single kernel image to support the rarer occasions of
lots of devices.

Signed-off-by: Dave Jones <davej@redhat.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig
index 812bae62c8ec..3fd5b999fdac 100644
--- a/drivers/serial/Kconfig
+++ b/drivers/serial/Kconfig
@@ -95,6 +95,16 @@ config SERIAL_8250_NR_UARTS
           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
+        default "4"
+        help
+          Set this to the maximum number of serial ports you want
+          the kernel to register at boot time.  This can be overriden
+          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