docs: ABI: testing: Document the SBEFIFO timeout interface

Add documentation for the new sysfs entry that indicates whether or not
the SBE has timed out.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
Link: https://lore.kernel.org/r/20211019211749.38059-2-eajames@linux.ibm.com
Signed-off-by: Joel Stanley <joel@jms.id.au>

diff --git a/Documentation/ABI/testing/sysfs-bus-fsi-devices-sbefifo b/Documentation/ABI/testing/sysfs-bus-fsi-devices-sbefifo
new file mode 100644 (file)
index 0000000..531fe9d
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-bus-fsi-devices-sbefifo
@@ -0,0 +1,10 @@
+What:          /sys/bus/fsi/devices/XX.XX.00:06/sbefifoX/timeout
+KernelVersion: 5.15
+Contact:       eajames@linux.ibm.com
+Description:
+               Indicates whether or not this SBE device has experienced a
+               timeout; i.e. the SBE did not respond within the time allotted
+               by the driver. A value of 1 indicates that a timeout has
+               ocurred and no transfers have completed since the timeout. A
+               value of 0 indicates that no timeout has ocurred, or if one
+               has, more recent transfers have completed successful.