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diff --git a/Documentation/ABI/testing/sysfs-bus-hsi b/Documentation/ABI/testing/sysfs-bus-hsi
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+What:           /sys/bus/hsi
+Date:           April 2012
+KernelVersion:  3.4
+Contact:        Carlos Chinea <carlos.chinea@nokia.com>
+Description:
+                High Speed Synchronous Serial Interface (HSI) is a
+                serial interface mainly used for connecting application
+                engines (APE) with cellular modem engines (CMT) in cellular
+                handsets.
+                The bus will be populated with devices (hsi_clients) representing
+                the protocols available in the system. Bus drivers implement
+                those protocols.
+
+What:           /sys/bus/hsi/devices/.../modalias
+Date:           April 2012
+KernelVersion:  3.4
+Contact:        Carlos Chinea <carlos.chinea@nokia.com>
+Description:    Stores the same MODALIAS value emitted by uevent
+                Format: hsi:<hsi_client device name>