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authorMark Brown <broonie@opensource.wolfsonmicro.com>2009-04-22 21:24:55 +0400
committerMark Brown <broonie@opensource.wolfsonmicro.com>2009-04-22 22:10:13 +0400
commit246d0a17f5e09af0794960164269fc8988a8811c (patch)
tree3c10da44183691038959ba0b53d5598ac1aaabc4 /Documentation/sound/alsa
parent1b4246a1fc487370665bf6c55aac8eae379642c0 (diff)
downloadlinux-246d0a17f5e09af0794960164269fc8988a8811c.tar.xz
ASoC: Add power supply widget to DAPM
Many modern CODECs have shared resources on chip which must be enabled for portions of the chip to work but which can be disabled at other times in order to achieve power savings. Examples of such resources include power supplies and some internal clocks. Since these widgets are dependencies for the audio path but do not carry audio signals they require slightly different handling to most widgets - they do not contribute to the audio path and so should not be counted as either inputs or outputs during path walks. Cases where one supply provides a supply for another will require additional work. There is also room for more optimisation of the graph walking to avoid repeated checks for the same thing. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Diffstat (limited to 'Documentation/sound/alsa')
-rw-r--r--Documentation/sound/alsa/soc/dapm.txt1
1 files changed, 1 insertions, 0 deletions
diff --git a/Documentation/sound/alsa/soc/dapm.txt b/Documentation/sound/alsa/soc/dapm.txt
index 9e6763264a2e..9ac842be9b4f 100644
--- a/Documentation/sound/alsa/soc/dapm.txt
+++ b/Documentation/sound/alsa/soc/dapm.txt
@@ -62,6 +62,7 @@ Audio DAPM widgets fall into a number of types:-
o Mic - Mic (and optional Jack)
o Line - Line Input/Output (and optional Jack)
o Speaker - Speaker
+ o Supply - Power or clock supply widget used by other widgets.
o Pre - Special PRE widget (exec before all others)
o Post - Special POST widget (exec after all others)