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[PATCHv5,13/13] DocBook: add SDR specific info to G_MODULATOR / S_MODULATOR

Message ID 1444495869-1969-14-git-send-email-crope@iki.fi (mailing list archive)
State New, archived
Headers show

Commit Message

Antti Palosaari Oct. 10, 2015, 4:51 p.m. UTC 
Add SDR specific notes to G_MODULATOR / S_MODULATOR documentation.

Signed-off-by: Antti Palosaari <crope@iki.fi>
---
 Documentation/DocBook/media/v4l/vidioc-g-modulator.xml | 6 ++++++
 1 file changed, 6 insertions(+)
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Patch

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>