[PATCH v2] of: WARN on deprecated #address-cells/#size-cells handling

[Geert Uytterhoeven]

On Thu, Nov 7, 2024 at 12:37 PM Michael Ellerman <mpe at ellerman.id.au> wrote:
> "Rob Herring (Arm)" <robh at kernel.org> writes:
> > While OpenFirmware originally allowed walking parent nodes and default
> > root values for #address-cells and #size-cells, FDT has long required
> > explicit values. It's been a warning in dtc for the root node since the
> > beginning (2005) and for any parent node since 2007. Of course, not all
> > FDT uses dtc, but that should be the majority by far. The various
> > extracted OF devicetrees I have dating back to the 1990s (various
> > PowerMac, OLPC, PASemi Nemo) all have explicit root node properties.
>
> I have various old device trees that have been given to me over the
> years, and as far as I can tell they all have these properties (some of
> them are partial trees so it's hard to be 100% sure).

Apparently CHRP LongTrail only had #address-cells in the root node.
Interestingly, /cpus does have a (zero) @size-cells property.
http://g33rt.be/migrated/Linux/PPC/root.html
http://g33rt.be/migrated/Linux/PPC/DeviceTree.html

No idea if any of them are still alive.

> So LGTM.

Indeed.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert at linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds