drivers/fsi: Document FSI master sysfs files in ABI

Add info for sysfs scan file in Documentaiton ABI/testing

Signed-off-by: Christopher Bostic <cbostic@linux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/Documentation/ABI/testing/sysfs-bus-fsi b/Documentation/ABI/testing/sysfs-bus-fsi
new file mode 100644 (file)
index 0000000..57c8063
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-bus-fsi
@@ -0,0 +1,38 @@
+What:           /sys/bus/platform/devices/fsi-master/rescan
+Date:          May 2017
+KernelVersion:  4.12
+Contact:        cbostic@linux.vnet.ibm.com
+Description:
+                Initiates a FSI master scan for all connected slave devices
+               on its links.
+
+What:           /sys/bus/platform/devices/fsi-master/break
+Date:          May 2017
+KernelVersion:  4.12
+Contact:        cbostic@linux.vnet.ibm.com
+Description:
+               Sends an FSI BREAK command on a master's communication
+               link to any connnected slaves.  A BREAK resets connected
+               device's logic and preps it to receive further commands
+               from the master.
+
+What:           /sys/bus/platform/devices/fsi-master/slave@00:00/term
+Date:          May 2017
+KernelVersion:  4.12
+Contact:        cbostic@linux.vnet.ibm.com
+Description:
+               Sends an FSI terminate command from the master to its
+               connected slave. A terminate resets the slave's state machines
+               that control access to the internally connected engines.  In
+               addition the slave freezes its internal error register for
+               debugging purposes.  This command is also needed to abort any
+               ongoing operation in case of an expired 'Master Time Out'
+               timer.
+
+What:           /sys/bus/platform/devices/fsi-master/slave@00:00/raw
+Date:          May 2017
+KernelVersion:  4.12
+Contact:        cbostic@linux.vnet.ibm.com
+Description:
+               Provides a means of reading/writing a 32 bit value from/to a
+               specified FSI bus address.