I stumbled on this although it does reference the stmpe811 as a touch
screen controller:
https://lore.kernel.org/linux-devicetree/20191119202850.18149-2-c-ro...@ti.com/
Jon
On Tue, Sep 15, 2020 at 9:45 AM Dennis Lee Bieber <dennis.l.bie...@gmail.com>
wrote:
> On Mon, 14 Sep 2020 15:34:35 -0700 (PDT), in
> gmane.comp.hardware.beagleboard.user Pierrick Rauby
> <pierrick.rauby-jemvhsqn...@public.gmane.org> wrote:
>
> >Hi Denis,
> >Thanks for your answer, I agree with you that both boards have an ADC. I
> >think my initial message was miss-leading.
> >
>
> >comes to the Beaglebone AI, it is based on the ti-am5729 which does not
> >have an on chip ADC, so the ADC of the Beaglebone AI is on board (an
> >STMPE811) and interfaced via I2C with the am5729 chip, at least this is
> >what I understood from this diagram
>
> I'd somehow missed that the BBAI ADC was "external" -- turns out
> the
> ADC mentions in the TRM are just for the internal temperature readings.
>
> In either case, I still believe the concern is not really with the
> ADC
> chip, but with getting I2C communication from the PRU. And based on my
> searches -- it just isn't done.
>
> There is no OS on the PRU, and I2C is handled by Linux kernel
> drivers.
> I suspect you'd have to bit-bang the I2C protocol on whatever GPIO is
> applicable (which may imply having to disable the OS I2C via device tree in
> order to convert the pins to PRU-GPIO that the PRU can manipulate){That, or
> disable Linux driver and perform low-level I/O to the I2C control registers
> -- ie; write an I2C driver library on the PRU}
>
> Sorry I have nothing more encouraging.
>
>
>
>
> --
> Dennis L Bieber
>
> --
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