linux-kernel - Re: [RFC PATCH 40/77] dtc: Introduce dti_get_node_by

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Message-ID: <aXq5_uaKjksnQOJj@zatzit>
Date: Thu, 29 Jan 2026 12:38:06 +1100
From: David Gibson <david@...son.dropbear.id.au>
To: Herve Codina <herve.codina@...tlin.com>
Cc: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Ayush Singh <ayush@...gleboard.org>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	devicetree-compiler@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, devicetree-spec@...r.kernel.org,
	Hui Pu <hui.pu@...ealthcare.com>,
	Ian Ray <ian.ray@...ealthcare.com>,
	Luca Ceresoli <luca.ceresoli@...tlin.com>,
	Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [RFC PATCH 40/77] dtc: Introduce dti_get_node_by_path()

On Mon, Jan 19, 2026 at 04:52:44PM +0100, Herve Codina wrote:
> Hi David,
> 
> On Thu, 15 Jan 2026 17:47:29 +1100
> David Gibson <david@...son.dropbear.id.au> wrote:
> 
> > On Mon, Jan 12, 2026 at 03:19:30PM +0100, Herve Codina wrote:
> > > The future introduction of orphan nodes for addons device-tree will lead
> > > to more than one tree in the addons data. Those trees will be:
> > >   - the classical root tree starting at the root node
> > >   - trees related to orphan nodes  
> > 
> > This doesn't make sense to me.  The new function still just takes a
> > single path, nothing to specify which tree that path is looked up in.
> > 
> > You can probably guarantee that labels and phandles are unique across
> > all the trees.  Not paths, though.
> > 
> 
> Paths can be unique across all trees. The tree needs to be indicated in the
> path. Starting by '/' is the root tree.

Oh, ok.  That wasn't clear from this patch, and I must have missed it
in my cursory look at the later patches.  I had the mistaken
impression this just looked for the same path in each orphan tree.

> For orphans, I proposed "$<orphan_name>/<path>" in patch 64 introducing
> references by path for orphan nodes and so, for orphan trees.
> 
> Best regards,
> Hervé
> 

-- 
David Gibson (he or they)	| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you, not the other way
				| around.
http://www.ozlabs.org/~dgibson

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