Unverified Commit dd5f36e5 authored by Luca Ceresoli's avatar Luca Ceresoli Committed by Mark Brown
Browse files

ASoC: doc: dapm: extend initial descrption 



Extend the initial description providing clearer definitions of "widget"
and "route", and to stop using the word "component" to mean "widget". Give
more details and clarify wording and add a picture representing a real DAPM
graph.

Group all the introductory paragraphs before the "DAPM power domains", and
split the latter to a specific section.

Reviewed-by: default avatarAlexandre Belloni <alexandre.belloni@bootlin.com>
Reviewed-by: default avatarBagas Sanjaya <bagasdotme@gmail.com>
Signed-off-by: default avatarLuca Ceresoli <luca.ceresoli@bootlin.com>
Link: https://lore.kernel.org/r/20240426-dapm-docs-v2-7-87b07547eb5b@bootlin.com


Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 7d0e7610

Documentation/sound/soc/dapm-graph.svg

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Documentation/sound/soc/dapm.rst

+21 −9
Original line number Diff line number Diff line
@@ -16,9 +16,27 @@ recompiling are required for user space applications. DAPM makes power 
switching decisions based upon any audio stream (capture/playback)

activity and audio mixer settings within the device.



DAPM spans the whole machine. It covers power control within the entire

audio subsystem, this includes internal codec power blocks and machine

level power systems.

DAPM is based on two basic elements, called widgets and routes:



 * a **widget** is every part of the audio hardware that can be enabled by

   software when in use and disabled to save power when not in use

 * a **route** is an interconnection between widgets that exists when sound

   can flow from one widget to the other



All DAPM power switching decisions are made automatically by consulting an

audio routing graph. This graph is specific to each sound card and spans

the whole sound card, so some DAPM routes connect two widgets belonging to

different components (e.g. the LINE OUT pin of a CODEC and the input pin of

an amplifier).



The graph for the STM32MP1-DK1 sound card is shown in picture:



.. kernel-figure:: dapm-graph.svg

    :alt:   Example DAPM graph

    :align: center



DAPM power domains

==================



There are 4 power domains within DAPM:
@@ -47,12 +65,6 @@ Stream domain 
      Enabled and disabled when stream playback/capture is started and

      stopped respectively. e.g. aplay, arecord.



All DAPM power switching decisions are made automatically by consulting an audio

routing graph of the whole machine. This graph is specific to each machine and

consists of the interconnections between every audio component (including

internal codec components). All audio components that affect power are called

widgets hereafter.





DAPM Widgets

============