USB: add driver for the USB debug devices

It's a simple usb-serial driver that just creates a tty device to read
and write from.

Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/serial/Kconfig b/drivers/usb/serial/Kconfig
index 2a8dd4c..2f4d303 100644
--- a/drivers/usb/serial/Kconfig
+++ b/drivers/usb/serial/Kconfig
@@ -554,6 +554,17 @@
 	  To compile this driver as a module, choose M here: the
 	  module will be called omninet.
 
+config USB_SERIAL_DEBUG
+	tristate "USB Debugging Device"
+	depends on USB_SERIAL
+	help
+	  Say Y here if you have a USB debugging device used to recieve
+	  debugging data from another machine.  The most common of these
+	  devices is the NetChip TurboCONNECT device.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called usb-debug.
+
 config USB_EZUSB
 	bool
 	depends on USB_SERIAL_KEYSPAN_PDA || USB_SERIAL_XIRCOM || USB_SERIAL_KEYSPAN || USB_SERIAL_WHITEHEAT