add documentation for V4L2_INPUT_TYPE_DEFAULT

Signed-off-by: Helen Koike <helen.ko...@collabora.com>
---
 Documentation/media/uapi/v4l/vidioc-enuminput.rst | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Documentation/media/uapi/v4l/vidioc-enuminput.rst 
b/Documentation/media/uapi/v4l/vidioc-enuminput.rst
index 17aaaf9..0237e10 100644
--- a/Documentation/media/uapi/v4l/vidioc-enuminput.rst
+++ b/Documentation/media/uapi/v4l/vidioc-enuminput.rst
@@ -112,6 +112,9 @@ at index zero, incrementing by one until the driver returns 
``EINVAL``.
     :stub-columns: 0
     :widths:       3 1 4
 
+    * - ``V4L2_INPUT_TYPE_DEFAULT``
+      - 0
+      - This is the default value returned when no input is supported.
     * - ``V4L2_INPUT_TYPE_TUNER``
       - 1
       - This input uses a tuner (RF demodulator).
-- 
2.7.4

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