Add SDR specific notes to G_MODULATOR / S_MODULATOR documentation.
Signed-off-by: Antti Palosaari <cr...@iki.fi>
---
Documentation/DocBook/media/v4l/vidioc-g-modulator.xml | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/Documentation/DocBook/media/v4l/vidioc-g-modulator.xml
b/Documentation/DocBook/media/v4l/vidioc-g-modulator.xml
index 80167fc..e83f1a3 100644
--- a/Documentation/DocBook/media/v4l/vidioc-g-modulator.xml
+++ b/Documentation/DocBook/media/v4l/vidioc-g-modulator.xml
@@ -78,6 +78,12 @@ different audio modulation if the request cannot be
satisfied. However
this is a write-only ioctl, it does not return the actual audio
modulation selected.</para>
+ <para><link linkend="sdr">SDR</link> specific modulator types are
+<constant>V4L2_TUNER_SDR</constant> and <constant>V4L2_TUNER_RF</constant>.
+For SDR devices <structfield>txsubchans</structfield> field must be
+initialized to zero.
+The term modulator means SDR transmitter in this context.</para>
+
<para>To change the radio frequency the &VIDIOC-S-FREQUENCY; ioctl
is available.</para>
--
http://palosaari.fi/
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