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author | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2009-04-22 17:24:55 (GMT) |
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committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2009-04-22 18:10:13 (GMT) |
commit | 246d0a17f5e09af0794960164269fc8988a8811c (patch) | |
tree | 3c10da44183691038959ba0b53d5598ac1aaabc4 /Documentation/sound | |
parent | 1b4246a1fc487370665bf6c55aac8eae379642c0 (diff) | |
download | linux-fsl-qoriq-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')
-rw-r--r-- | Documentation/sound/alsa/soc/dapm.txt | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/Documentation/sound/alsa/soc/dapm.txt b/Documentation/sound/alsa/soc/dapm.txt index 9e67632..9ac842b 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) |