WHQL certification of device driver

I am going to have a USB device driver WHQL certified. I am going for the
"Unclassifed Signature" program that only certifies my driver and not the
device (a USB device in my case).
Our driver supports multiple USB devices identified in the driver .INF file
by their USB Vendor and Product ID (VID, PID).
My questions is:
Do we have to run the WHQL tests against all devices listed in the .INF
file, or is it sufficient to test the driver against only one of the devices
listed in the .INF file? In other words, does a winqual submission require
test reports for all listed devices in the .INF?

Regards,
Bo