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

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Message-ID: <20260119165244.4dc11e18@bootlin.com>
Date: Mon, 19 Jan 2026 16:52:44 +0100
From: Herve Codina <herve.codina@...tlin.com>
To: David Gibson <david@...son.dropbear.id.au>
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()

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.

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