1 files changed, 12 insertions, 0 deletions

diff --git a/Documentation/DocBook/libata.tmpl b/Documentation/DocBook/libata.tmpl
index 70b811e9f2ca..828748c4e78d 100644
--- a/Documentation/DocBook/libata.tmpl
+++ b/Documentation/DocBook/libata.tmpl
@@ -225,6 +225,18 @@ u8   (*sff_check_altstatus)(struct ata_port *ap);
 
         </sect2>
 
+        <sect2><title>Write specific ATA shadow register</title>
+        <programlisting>
+void (*sff_set_devctl)(struct ata_port *ap, u8 ctl);
+        </programlisting>
+
+        <para>
+        Write the device control ATA shadow register to the hardware.
+        Most drivers don't need to define this.
+        </para>
+
+        </sect2>
+
         <sect2><title>Select ATA device on bus</title>
         <programlisting>
 void (*sff_dev_select)(struct ata_port *ap, unsigned int device);