serial: 8250: describe CONFIG_SERIAL_8250_RSA

CONFIG_SERIAL_8250_RSA has waited for a long
time to have meaningful help text so let's
finally describe what this option actually does.

Signed-off-by: Maciej S. Szmigiero <mail@maciej.szmigiero.name>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/8250/Kconfig b/drivers/tty/serial/8250/Kconfig
index 6d206001336b5e9dfefd58177dd68ad9b662b834..64742a086ae3385f3fb1680b912e48dcfb1770de 100644 (file)
--- a/drivers/tty/serial/8250/Kconfig
+++ b/drivers/tty/serial/8250/Kconfig
@@ -262,7 +262,12 @@ config SERIAL_8250_RSA
        bool "Support RSA serial ports"
        depends on SERIAL_8250_EXTENDED
        help
-         ::: To be written :::
+         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_ACORN
        tristate "Acorn expansion card serial port support"