FMC: add a software mezzanine driver

This simple do-nothing mezzanine driver shows how to write a mezzanine
driver, that can also handle interrupts reported by the carrier.

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>
Acked-by: Juan David Gonzalez Cobas <dcobas@cern.ch>
Acked-by: Emilio G. Cota <cota@braap.org>
Acked-by: Samuel Iglesias Gonsalvez <siglesias@igalia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/Documentation/fmc/00-INDEX b/Documentation/fmc/00-INDEX
index 34df5cf..c22d687 100644
--- a/Documentation/fmc/00-INDEX
+++ b/Documentation/fmc/00-INDEX
@@ -27,3 +27,6 @@
 
 fmc-fakedev.txt
 	- about drivers/fmc/fmc-fakedev.ko
+
+fmc-trivial.txt
+	- about drivers/fmc/fmc-trivial.ko