diff --git a/[refs] b/[refs]
index 697617a14684..ab167f6782da 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: f9e402016de91c2444e46ecfd706880969b1ae9e
+refs/heads/master: a4ac73a701288f633fbf2369ffaae4841aa295b3
diff --git a/trunk/Documentation/DocBook/device-drivers.tmpl b/trunk/Documentation/DocBook/device-drivers.tmpl
index b638e50cf8f6..5f70f734e8b4 100644
--- a/trunk/Documentation/DocBook/device-drivers.tmpl
+++ b/trunk/Documentation/DocBook/device-drivers.tmpl
@@ -437,4 +437,21 @@ X!Idrivers/video/console/fonts.c
 !Edrivers/i2c/i2c-core.c
   </chapter>
 
+  <chapter id="hsi">
+     <title>High Speed Synchronous Serial Interface (HSI)</title>
+
+     <para>
+	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.
+
+	HSI provides multiplexing for up to 16 logical channels,
+	low-latency and full duplex communication.
+     </para>
+
+!Iinclude/linux/hsi/hsi.h
+!Edrivers/hsi/hsi.c
+  </chapter>
+
 </book>