[PATCH v6 00/10] Add support for RaspberryPi RP1 PCI device using a DT overlay

[Phil Elwell]

On Thu, 13 Feb 2025 at 17:45, Andrew Lunn <andrew at lunn.ch> wrote:
>
> > > Or do you mean a custom board, which has a CPU, RP1 and the button and
> > > fan are directly on this custom board? You then want a board DTS which
> > > includes all these pieces?
> >
> > That depends on whether you count the Raspberry Pi 5 as a custom board.
>
> So you mean the Pi 5 board would itself make use of the resources the
> RP1 device has? They are not simply connected to headers for plugin
> boards, but used by the main board? Hence you want to describe them in
> the board .DTS file.

That's correct. But even for plug-in devices, those which are on
non-discoverable buses need overlays to declare them, which causes a
problem when the overlay application happens before the kernel is
started.

Phil