Documentation: Add new /sys/kernel/debug/ec/* files to ABI

Signed-off-by: Thomas Renninger <[e-mail]>

CC: Alexey Starikovskiy <[e-mail]>
CC: Len Brown <[e-mail]>
CC: [e-mail]
CC: [e-mail]
CC: [e-mail]
Signed-off-by: Matthew Garrett <[e-mail]>

Documentation/ABI/testing/debugfs-ec

···
+What:		/sys/kernel/debug/ec/*/{gpe,use_global_lock,io}
+Date:		July 2010
+Contact:	Thomas Renninger <[e-mail]>
+Description:
+
+General information like which GPE is assigned to the EC and whether
+the global lock should get used.
+Knowing the EC GPE one can watch the amount of HW events related to
+the EC here (XY -> GPE number from /sys/kernel/debug/ec/*/gpe):
+/sys/firmware/acpi/interrupts/gpeXY
+
+The io file is binary and a userspace tool located here:
+ftp://ftp.suse.com/pub/people/trenn/sources/ec/
+should get used to read out the 256 Embedded Controller registers
+or writing to them.
+
+CAUTION: Do not write to the Embedded Controller if you don't know
+what you are doing! Rebooting afterwards also is a good idea.
+This can influence the way your machine is cooled and fans may
+not get switched on again after you did a wrong write.