[AudioI] free pins on top of Octo to add control

[Alberto Novello]

*Hi Matt! thanks I reply to your answer line by line so it's easier:*

> Awesome artworks mate !
>
*Thanks!!! I'm sure is gonna be even better with your soundcard :)*

> Yes some GPIOs are being used.
>
> The device tree is a good place to start to look :
> https://github.com/raspberrypi/linux/blob/rpi-4.19.y/arch/arm/boot/dts/overlays/audioinjector-addons-overlay.dts
>
> For codec controls :
> pins : 13, 15, 16, 18, 29
> GPIOs : 27, 22, 23, 24, 5
>
> The sound card also uses the I2S gpios : 18, 19, 20, 21
>
*Are these GPIOs or Pins? *

> I2C is shared with other applications GPIO : 2, 3
>
*That means other applications can use those pins too as I2C? I'm not an
expert as you can tell...*

* Thanks a lot!*
*A*


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ALBERTO NOVELLO / JesterN
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