[PATCH 29/47] [media] ca-get-descr-info.rst: add doc for for struct ca_descr_info

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The documentation follows what's there at the ca.h header.

Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxxxxx>
---
 Documentation/media/uapi/dvb/ca-get-descr-info.rst | 23 +++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/Documentation/media/uapi/dvb/ca-get-descr-info.rst b/Documentation/media/uapi/dvb/ca-get-descr-info.rst
index b007f10b4910..b4a31940cec0 100644
--- a/Documentation/media/uapi/dvb/ca-get-descr-info.rst
+++ b/Documentation/media/uapi/dvb/ca-get-descr-info.rst
@@ -25,7 +25,28 @@ Arguments
   File descriptor returned by a previous call to :c:func:`open() <dvb-ca-open>`.
 
 ``desc``
-  Undocumented.
+  Pointer to struct :c:type:`ca_descr_info`.
+
+.. c:type:: struct ca_descr_info
+
+.. flat-table:: struct ca_descr_info
+    :header-rows:  1
+    :stub-columns: 0
+
+    -
+      - type
+      - name
+      - description
+
+    -
+      - unsigned int
+      - num
+      - number of available descramblers (keys)
+    -
+      - unsigned int
+      - type
+      - type of supported scrambling system. Valid values are:
+	``CA_ECD``, ``CA_NDS`` and ``CA_DSS``.
 
 
 Description
-- 
2.7.4


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