X-Git-Url: https://git.kernelconcepts.de/?a=blobdiff_plain;f=Documentation%2FDocBook%2Fmedia%2Fv4l%2Fcontrols.xml;h=f13a429093f174c406b293a5ca21e8e4d1526e47;hb=3706492a32d8042e039220dcf7d45d6f54ad28fa;hp=33aece5418800c51e0b6756e2fc02dc4e222e253;hpb=bbbe29d8e0322bd36053edbd552c228e3111cc0a;p=karo-tx-linux.git
diff --git a/Documentation/DocBook/media/v4l/controls.xml b/Documentation/DocBook/media/v4l/controls.xml
index 33aece541880..f13a429093f1 100644
--- a/Documentation/DocBook/media/v4l/controls.xml
+++ b/Documentation/DocBook/media/v4l/controls.xml
@@ -5417,6 +5417,18 @@ set. Unit is in Hz. The range and step are driver-specific.
Enables/disables IF automatic gain control (AGC)
+
+ V4L2_CID_RF_TUNER_RF_GAIN
+ integer
+
+
+ The RF amplifier is the very first
+amplifier on the receiver signal path, just right after the antenna input.
+The difference between the LNA gain and the RF gain in this document is that
+the LNA gain is integrated in the tuner chip while the RF gain is a separate
+chip. There may be both RF and LNA gain controls in the same device.
+The range and step are driver-specific.
+
V4L2_CID_RF_TUNER_LNA_GAIN
integer
@@ -5425,6 +5437,8 @@ set. Unit is in Hz. The range and step are driver-specific.
LNA (low noise amplifier) gain is first
gain stage on the RF tuner signal path. It is located very close to tuner
antenna input. Used when V4L2_CID_RF_TUNER_LNA_GAIN_AUTO is not set.
+See V4L2_CID_RF_TUNER_RF_GAIN to understand how RF gain
+and LNA gain differs from the each others.
The range and step are driver-specific.