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.
Signed-off-by: Luca Ceresoli <luca.ceresoli@xxxxxxxxxxx>
---
Documentation/sound/soc/dapm-graph.svg | 375 +++++++++++++++++++++++++++++++++
Documentation/sound/soc/dapm.rst | 30 ++-
2 files changed, 396 insertions(+), 9 deletions(-)
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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+<g id="edge13" class="edge">
+<title>cs42l51.0-004a_MICR->cs42l51.0-004a_Mic Preamp Right</title>
+<path fill="none" stroke="black" d="M474.28,-544.83C475.67,-537.13 477.32,-527.97 478.87,-519.42"/>
+<polygon fill="black" stroke="black" points="482.34,-519.88 480.68,-509.41 475.45,-518.63 482.34,-519.88"/>
+</g>
+<!-- cs42l51.0-004a_Mic Bias -->
+<g id="node19" class="node">
+<title>cs42l51.0-004a_Mic Bias</title>
+<polygon fill="#f2f2f2" stroke="#4d4d4d" points="409.5,-583 338.5,-583 338.5,-545 409.5,-545 409.5,-583"/>
+<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>
+</g>
+<!-- cs42l51.0-004a_Mic Bias->cs42l51.0-004a_MICL -->
+<g id="edge11" class="edge">
+<title>cs42l51.0-004a_Mic Bias->cs42l51.0-004a_MICL</title>
+<path fill="none" stroke="black" d="M372.74,-544.83C372.2,-537.13 371.57,-527.97 370.97,-519.42"/>
+<polygon fill="black" stroke="black" points="374.46,-519.15 370.28,-509.41 367.48,-519.63 374.46,-519.15"/>
+</g>
+<!-- cs42l51.0-004a_PGA-ADC Mux Left->cs42l51.0-004a_Left PGA -->
+<g id="edge10" class="edge">
+<title>cs42l51.0-004a_PGA-ADC Mux Left->cs42l51.0-004a_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"/>
+</g>
+<!-- cs42l51.0-004a_Right PGA -->
+<g id="node27" class="node">
+<title>cs42l51.0-004a_Right PGA</title>
+<polygon fill="#f2f2f2" stroke="#4d4d4d" points="688.5,-424 605.5,-424 605.5,-386 688.5,-386 688.5,-424"/>
+<text text-anchor="middle" x="647" y="-408.8" font-family="sans-serif" font-size="14.00">Right PGA</text>
+<text text-anchor="middle" x="647" y="-393.8" font-family="sans-serif" font-size="14.00">[pga]</text>
+</g>
+<!-- cs42l51.0-004a_PGA-ADC Mux Right->cs42l51.0-004a_Right PGA -->
+<g id="edge19" class="edge">
+<title>cs42l51.0-004a_PGA-ADC Mux Right->cs42l51.0-004a_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"/>
+</g>
+<!-- cs42l51.0-004a_Playback->cs42l51.0-004a_DAC Mux -->
+<g id="edge5" class="edge">
+<title>cs42l51.0-004a_Playback->cs42l51.0-004a_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"/>
+</g>
+<!-- cs42l51.0-004a_Right ADC -->
+<g id="node25" class="node">
+<title>cs42l51.0-004a_Right ADC</title>
+<polygon fill="#f2f2f2" stroke="#4d4d4d" points="697,-350 613,-350 613,-312 697,-312 697,-350"/>
+<text text-anchor="middle" x="655" y="-334.8" font-family="sans-serif" font-size="14.00">Right ADC</text>
+<text text-anchor="middle" x="655" y="-319.8" font-family="sans-serif" font-size="14.00">[adc]</text>
+</g>
+<!-- cs42l51.0-004a_Right ADC->cs42l51.0-004a_Capture -->
+<g id="edge3" class="edge">
+<title>cs42l51.0-004a_Right ADC->cs42l51.0-004a_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>
+<!-- cs42l51.0-004a_Right DAC->cs42l51.0-004a_HPR -->
+<g id="edge7" class="edge">
+<title>cs42l51.0-004a_Right DAC->cs42l51.0-004a_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>
+<!-- cs42l51.0-004a_Right PGA->cs42l51.0-004a_Right ADC -->
+<g id="edge17" class="edge">
+<title>cs42l51.0-004a_Right PGA->cs42l51.0-004a_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-audio-codec.1.auto_TX -->
+<g id="node30" class="node">
+<title>hdmi-audio-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-audio-codec.1.auto_I2S Playback->hdmi-audio-codec.1.auto_TX -->
+<g id="edge22" class="edge">
+<title>hdmi-audio-codec.1.auto_I2S Playback->hdmi-audio-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"/>
+<polygon fill="black" stroke="black" points="253.78,-518.77 248.81,-509.41 246.86,-519.83 253.78,-518.77"/>
+</g>
+<!-- hdmi-audio-codec.1.auto_RX -->
+<g id="node29" class="node">
+<title>hdmi-audio-codec.1.auto_RX</title>
+<polygon fill="#f2f2f2" stroke="#4d4d4d" points="189.5,-583 118.5,-583 118.5,-545 189.5,-545 189.5,-583"/>
+<text text-anchor="middle" x="154" y="-567.8" font-family="sans-serif" font-size="14.00">RX</text>
+<text text-anchor="middle" x="154" y="-552.8" font-family="sans-serif" font-size="14.00">[output]</text>
+</g>
+<!-- hdmi-audio-codec.1.auto_RX->hdmi-audio-codec.1.auto_Capture -->
+<g id="edge20" class="edge">
+<title>hdmi-audio-codec.1.auto_RX->hdmi-audio-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"/>
+<polygon fill="black" stroke="black" points="158.1,-519.46 154.74,-509.41 151.11,-519.36 158.1,-519.46"/>
+</g>
+</g>
+</svg>
diff --git a/Documentation/sound/soc/dapm.rst b/Documentation/sound/soc/dapm.rst
index cab40a6b4c96..3a2fde1d31bf 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
============
--
2.34.1
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