diff mbox series

[v2,07/12] ASoC: doc: dapm: extend initial descrption

Message ID 20240426-dapm-docs-v2-7-87b07547eb5b@bootlin.com (mailing list archive)
State Accepted
Commit dd5f36e59134654f9fd7b39d4d66327a1a2db82d
Headers show
Series ASoC: doc: dapm: various improvements | expand

Commit Message

Luca Ceresoli April 26, 2024, 4:56 p.m. UTC 
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: Alexandre Belloni <alexandre.belloni@bootlin.com>
Reviewed-by: Bagas Sanjaya <bagasdotme@gmail.com>
Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
---
 Documentation/sound/soc/dapm-graph.svg | 375 +++++++++++++++++++++++++++++++++
 Documentation/sound/soc/dapm.rst       |  30 ++-
 2 files changed, 396 insertions(+), 9 deletions(-)
diff mbox series

Patch

diff --git a/Documentation/sound/soc/dapm-graph.svg b/Documentation/sound/soc/dapm-graph.svg
new file mode 100644
index 000000000000..d783672db815
--- /dev/null
+++ b/Documentation/sound/soc/dapm-graph.svg
@@ -0,0 +1,375 @@ 
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+<polygon fill="black" stroke="black" points="392.96,-434.85 393.18,-424.26 386.4,-432.4 392.96,-434.85"/>
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+<!-- cs42l51.0&#45;004a_Mic Preamp Right -->
+<g id="node21" class="node">
+<title>cs42l51.0&#45;004a_Mic Preamp Right</title>
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+<text text-anchor="middle" x="484" y="-478.8" font-family="sans-serif" font-size="14.00">[mixer]</text>
+</g>
+<!-- cs42l51.0&#45;004a_MICR&#45;&gt;cs42l51.0&#45;004a_Mic Preamp Right -->
+<g id="edge13" class="edge">
+<title>cs42l51.0&#45;004a_MICR&#45;&gt;cs42l51.0&#45;004a_Mic Preamp Right</title>
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+<text text-anchor="middle" x="374" y="-567.8" font-family="sans-serif" font-size="14.00">Mic Bias</text>
+<text text-anchor="middle" x="374" y="-552.8" font-family="sans-serif" font-size="14.00">[supply]</text>
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+<!-- cs42l51.0&#45;004a_Mic Bias&#45;&gt;cs42l51.0&#45;004a_MICL -->
+<g id="edge11" class="edge">
+<title>cs42l51.0&#45;004a_Mic Bias&#45;&gt;cs42l51.0&#45;004a_MICL</title>
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+<polygon fill="black" stroke="black" points="374.46,-519.15 370.28,-509.41 367.48,-519.63 374.46,-519.15"/>
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+<!-- cs42l51.0&#45;004a_PGA&#45;ADC Mux Left&#45;&gt;cs42l51.0&#45;004a_Left PGA -->
+<g id="edge10" class="edge">
+<title>cs42l51.0&#45;004a_PGA&#45;ADC Mux Left&#45;&gt;cs42l51.0&#45;004a_Left PGA</title>
+<path fill="none" stroke="black" d="M804.92,-470.99C804.27,-460.3 803.44,-446.5 802.71,-434.37"/>
+<polygon fill="black" stroke="black" points="806.2,-434.03 802.1,-424.26 799.21,-434.45 806.2,-434.03"/>
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+<text text-anchor="middle" x="647" y="-393.8" font-family="sans-serif" font-size="14.00">[pga]</text>
+</g>
+<!-- cs42l51.0&#45;004a_PGA&#45;ADC Mux Right&#45;&gt;cs42l51.0&#45;004a_Right PGA -->
+<g id="edge19" class="edge">
+<title>cs42l51.0&#45;004a_PGA&#45;ADC Mux Right&#45;&gt;cs42l51.0&#45;004a_Right PGA</title>
+<path fill="none" stroke="black" d="M643.87,-470.99C644.38,-460.3 645.05,-446.5 645.63,-434.37"/>
+<polygon fill="black" stroke="black" points="649.13,-434.42 646.12,-424.26 642.14,-434.08 649.13,-434.42"/>
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+<!-- cs42l51.0&#45;004a_Playback&#45;&gt;cs42l51.0&#45;004a_DAC Mux -->
+<g id="edge5" class="edge">
+<title>cs42l51.0&#45;004a_Playback&#45;&gt;cs42l51.0&#45;004a_DAC Mux</title>
+<path fill="none" stroke="black" d="M560,-237.83C560,-230.13 560,-220.97 560,-212.42"/>
+<polygon fill="black" stroke="black" points="563.5,-212.41 560,-202.41 556.5,-212.41 563.5,-212.41"/>
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+<g id="node25" class="node">
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+<text text-anchor="middle" x="655" y="-319.8" font-family="sans-serif" font-size="14.00">[adc]</text>
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+<!-- cs42l51.0&#45;004a_Right ADC&#45;&gt;cs42l51.0&#45;004a_Capture -->
+<g id="edge3" class="edge">
+<title>cs42l51.0&#45;004a_Right ADC&#45;&gt;cs42l51.0&#45;004a_Capture</title>
+<path fill="none" stroke="black" d="M655,-311.83C655,-304.13 655,-294.97 655,-286.42"/>
+<polygon fill="black" stroke="black" points="658.5,-286.41 655,-276.41 651.5,-286.41 658.5,-286.41"/>
+</g>
+<!-- cs42l51.0&#45;004a_Right DAC&#45;&gt;cs42l51.0&#45;004a_HPR -->
+<g id="edge7" class="edge">
+<title>cs42l51.0&#45;004a_Right DAC&#45;&gt;cs42l51.0&#45;004a_HPR</title>
+<path fill="none" stroke="black" d="M608,-89.83C608,-82.13 608,-72.97 608,-64.42"/>
+<polygon fill="black" stroke="black" points="611.5,-64.41 608,-54.41 604.5,-64.41 611.5,-64.41"/>
+</g>
+<!-- cs42l51.0&#45;004a_Right PGA&#45;&gt;cs42l51.0&#45;004a_Right ADC -->
+<g id="edge17" class="edge">
+<title>cs42l51.0&#45;004a_Right PGA&#45;&gt;cs42l51.0&#45;004a_Right ADC</title>
+<path fill="none" stroke="black" d="M649.02,-385.83C649.87,-378.13 650.89,-368.97 651.84,-360.42"/>
+<polygon fill="black" stroke="black" points="655.33,-360.74 652.95,-350.41 648.37,-359.97 655.33,-360.74"/>
+</g>
+<!-- hdmi&#45;audio&#45;codec.1.auto_TX -->
+<g id="node30" class="node">
+<title>hdmi&#45;audio&#45;codec.1.auto_TX</title>
+<polygon fill="#f2f2f2" stroke="#4d4d4d" points="281.5,-509 210.5,-509 210.5,-471 281.5,-471 281.5,-509"/>
+<text text-anchor="middle" x="246" y="-493.8" font-family="sans-serif" font-size="14.00">TX</text>
+<text text-anchor="middle" x="246" y="-478.8" font-family="sans-serif" font-size="14.00">[output]</text>
+</g>
+<!-- hdmi&#45;audio&#45;codec.1.auto_I2S Playback&#45;&gt;hdmi&#45;audio&#45;codec.1.auto_TX -->
+<g id="edge22" class="edge">
+<title>hdmi&#45;audio&#45;codec.1.auto_I2S Playback&#45;&gt;hdmi&#45;audio&#45;codec.1.auto_TX</title>
+<path fill="none" stroke="black" d="M254.22,-544.83C253.05,-537.13 251.65,-527.97 250.34,-519.42"/>
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+<!-- hdmi&#45;audio&#45;codec.1.auto_RX -->
+<g id="node29" class="node">
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+<text text-anchor="middle" x="154" y="-552.8" font-family="sans-serif" font-size="14.00">[output]</text>
+</g>
+<!-- hdmi&#45;audio&#45;codec.1.auto_RX&#45;&gt;hdmi&#45;audio&#45;codec.1.auto_Capture -->
+<g id="edge20" class="edge">
+<title>hdmi&#45;audio&#45;codec.1.auto_RX&#45;&gt;hdmi&#45;audio&#45;codec.1.auto_Capture</title>
+<path fill="none" stroke="black" d="M154.25,-544.83C154.36,-537.13 154.49,-527.97 154.61,-519.42"/>
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diff --git a/Documentation/sound/soc/dapm.rst b/Documentation/sound/soc/dapm.rst
index 11f7f2f685af..58ef880ac8b6 100644
--- a/Documentation/sound/soc/dapm.rst
+++ b/Documentation/sound/soc/dapm.rst
@@ -17,9 +17,27 @@  recompiling are required for user space applications to use it. 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:
 
@@ -48,12 +66,6 @@  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
 ============