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The ArmSoM Sige5 board features an Everest ES8388 codec to provide analog stereo audio output, as well as analog audio input. The codec hangs off the i2c2 bus and responds to address 0x10. It is connected to the SAI1 audio controller of the RK3576, with one SDO (output) lane and one SDI (input) lane. The codec has two sets of outputs. One set, LOUT1/ROUT1, is connected through a set of 22uF non-polarised coupling capacitors to a 3-position connector that appears to be a clone of the JST BM03B-SURS-TF header, and is capable of mating with a JST 03SUR-32S (or JST 03SUR-36L if you prefer lemon-lime) or compatible clone connector. The right headphone output is the one closest to the Type-C DC input connector, the left headphone output is the one in the middle, and the third position, the one closest to the USB3 Type-A host connector, is puzzingly labelled as "HP_GND" in the schematic but is in fact connected to the codecs RIN1 input through a 1uF non-plarised coupling capacitor. LOUT2 and ROUT2 are routed to 1mm test pads T36 and T37 respectively. These are located on the bottom of the board, and do not go through any coupling capacitor. For use as line out, the ES8388 datasheet recommends adding 1uF coupling capacitor if one wishes to use it as a line-level output. There is also a pair of inputs for a stereo microphone, going from two 1mm testpads T34 and T35, which are decoupled with a 100pF capacitor and pulled to 3.3v and ground respectively. These inputs then go through 1uF capacitors each and end up in the LINPUT2 and RINPUT2 pins of the ES8388 codec. The codec's power inputs are routed to receive 3.3V for both its analog and digital inputs, though from different supplies. Signed-off-by: Nicolas Frattaroli <nicolas.frattaroli@collabora.com> Link: https://lore.kernel.org/r/20250506-rk3576-sai-v4-3-a8b5f5733ceb@collabora.com Signed-off-by: Heiko Stuebner <heiko@sntech.de> |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.