[media] DVB: Docbook update for DTV_ENUM_DELSYS

Signed-off-by: Manu Abraham <abraham.manu@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/Documentation/DocBook/media/dvb/dvbproperty.xml b/Documentation/DocBook/media/dvb/dvbproperty.xml
index 6ac803959a47..b812e3140fcb 100644
--- a/Documentation/DocBook/media/dvb/dvbproperty.xml
+++ b/Documentation/DocBook/media/dvb/dvbproperty.xml
@@ -649,6 +649,18 @@ typedef enum fe_hierarchy {
                         many data types via a single multiplex. The API will soon support this
                         at which point this section will be expanded.</para>
         </section>
+        <section id="DTV_ENUM_DELSYS">
+                <title><constant>DTV_ENUM_DELSYS</constant></title>
+                <para>A Multi standard frontend needs to advertise the delivery systems provided.
+                        Applications need to enumerate the provided delivery systems, before using
+                        any other operation with the frontend. Prior to it's introduction,
+                        FE_GET_INFO was used to determine a frontend type. A frontend which
+                        provides more than a single delivery system, FE_GET_INFO doesn't help much.
+                        Applications which intends to use a multistandard frontend must enumerate
+                        the delivery systems associated with it, rather than trying to use
+                        FE_GET_INFO. In the case of a legacy frontend, the result is just the same
+                        as with FE_GET_INFO, but in a more structured format </para>
+        </section>
 </section>
         <section id="frontend-property-terrestrial-systems">
         <title>Properties used on terrestrial delivery systems</title>