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

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Message-ID: <87jzdfcm3l.fsf@mpe.ellerman.id.au>
Date: Thu, 07 Nov 2024 22:35:58 +1100
From: Michael Ellerman <mpe@...erman.id.au>
To: "Rob Herring (Arm)" <robh@...nel.org>, Saravana Kannan
 <saravanak@...gle.com>
Cc: linuxppc-dev@...ts.ozlabs.org, Conor Dooley <conor@...nel.org>,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] of: WARN on deprecated #address-cells/#size-cells
 handling

"Rob Herring (Arm)" <robh@...nel.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).

So LGTM.

cheers