From c7c1d5a5dea80d908fa9a7945424d872b3588757 Mon Sep 17 00:00:00 2001
From: Antti Palosaari <crope@iki.fi>
Date: Sat, 10 Oct 2015 13:51:09 -0300
Subject: [media] DocBook: add SDR specific info to G_MODULATOR / S_MODULATOR

Add SDR specific notes to G_MODULATOR / S_MODULATOR documentation.

Signed-off-by: Antti Palosaari <crope@iki.fi>
[hans.verkuil@cisco.com: add quotes in "The term 'modulator'"]
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>

Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
---
 Documentation/DocBook/media/v4l/vidioc-g-modulator.xml | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'Documentation/DocBook')

diff --git a/Documentation/DocBook/media/v4l/vidioc-g-modulator.xml b/Documentation/DocBook/media/v4l/vidioc-g-modulator.xml
index 80167fc..96e17b3 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>
 
-- 
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