Re: Attaching GPIO on PCEngines apu2

[Greg Troxel <gdt%lexort.com@localhost>]

David Brownlee <abs%absd.org@localhost> writes:

> Would anyone have any thoughts on how hard it would be to attach some
> LED controlling GPIO pins on an PCEngine apu2
>
> dmesg from netbsd-11 identifies them as:
>
> GPIO (AMD0030) at acpi0 not configured
> BTNS (PRP0001) at acpi0 not configured
> BTN1 (PRP0001) at acpi0 not configured
> LEDS (PRP0001) at acpi0 not configured
> LED1 (PRP0001) at acpi0 not configured
> LED2 (PRP0001) at acpi0 not configured
> LED3 (PRP0001) at acpi0 not configured
> CTBL (BOOT0000) at acpi0 not configured

I would have thought this was done already but my netbsd-9 dmesg says
the same.  Good to know netbsd-11 is working.

This might help:

  https://pcengines.github.io/apu2-documentation/gpios/

It seems likely that "cpu0: AMD GX-412TC SOC" has an AMD gpio controller
built it and that one needs to wreit gpioamd(4), or find out that amd
meets some standard interface.

see src/sys/dev/acpi/acpi_gpio.c

sorry, not  really great hints....