drivers/codec: Add driver for the WM8960 codec.

This codec is assembled for the MIMXRT1xxx_DEV boards and available for WM8960 breakout boards as well. The driver itself has been tested as working with the MIMXRT boards and a Sparkfun WM6890 breakout board. It implements the initialization, basic methods and some enhanced methods like 3D, ALC, soft-mute and deemphasis.
micropython · Apr 4, 2022 · 56b331a · 56b331a
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diff --git a/docs/library/index.rst b/docs/library/index.rst
@@ -97,6 +97,13 @@ the following libraries.
    network.rst
    uctypes.rst
 
+The following libraries provide drivers for hardware components.
+
+.. toctree::
+  :maxdepth: 1
+
+  wm8960.rst
+
 
 Port-specific libraries
 -----------------------

diff --git a/docs/library/machine.I2S.rst b/docs/library/machine.I2S.rst
@@ -72,6 +72,13 @@ uasyncio::
    sreader = uasyncio.StreamReader(audio_in)
    num_read = await sreader.readinto(buf)
 
+Some codec devices like the WM8960 or SGTL5000 require separate initialization
+before they can operate with the I2S class.  For these, separate drivers are
+supplied, which also offer methods for controlling volume, audio processing and
+other things.  For these drivers see:
+
+- :ref:`wm8960`
+
 Constructor
 -----------