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docs/raspberrypi-4b: Document PWM configuration

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Documents the configuration which allows PWM audio.

Signed-off-by: Matteo Golin <matteo.golin@gmail.com>
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Matteo Golin 2026-07-08 20:24:02 -04:00 • committed by Xiang Xiao
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Documentation/platforms/arm64/bcm2711/boards/raspberrypi-4b/index.rst
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@ -322,3 +322,15 @@ This configuration leverages all four A72 cores of the BCM2711. It comes with
the standard NSH shell, :doc:`/applications/testing/getprime/index`,
:doc:`/applications/testing/ostest/index`, and
:doc:`/applications/testing/smp/index` tests.
audio_tone
----------
This configuration enables PWM0 and PWM1 interfaces and provides examples like
:doc:`/applications/examples/pwm/index` for playing with sound. The audio jack
right and left channels are channel 1 and 2 of ``/dev/pwm1``.
.. warning::
Audio output over the jack is very loud. DO NOT plug in earbuds until first
assessing the sound level with them out of your ears.