linux-kernel - Re: [PATCH 0/7] of: overlay: Add support for export-symbols node feature

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Message-ID: <Z4Chb_nEDTHms_ZN@zatzit>
Date: Fri, 10 Jan 2025 15:26:23 +1100
From: David Gibson <david@...son.dropbear.id.au>
To: Herve Codina <herve.codina@...tlin.com>
Cc: Ayush Singh <ayush@...gleboard.org>, Andrew Davis <afd@...com>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Saravana Kannan <saravanak@...gle.com>, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Luca Ceresoli <luca.ceresoli@...tlin.com>,
	Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH 0/7] of: overlay: Add support for export-symbols node
 feature

On Wed, Jan 08, 2025 at 10:47:19AM +0100, Herve Codina wrote:
> Hi Ayush,
> 
> On Wed, 8 Jan 2025 13:58:04 +0530
> Ayush Singh <ayush@...gleboard.org> wrote:
> 
> ...
> > 
> > I will experiment with adding support to dtc and see how things look. 
> > Hopefully, 2025 is the year of addon board support.
> > 
> 
> Also one point different between fdtoverlay an runtime loading is
> that runtime loading allows to set the target node of the overlay
> at runtime.

I'm not really sure what you mean by "runtime loading".  Do you mean
the kernel's implementation of loading dtbo overlays?

While that is a different implementation from the one in fdtoverlay
(AIUI), they're both working from the same dtb format.  As we
discovered attempting Ayush's proposal, it turns out that the dtbo
simply doesn't have the information we need to correctly path
substitutions; and it's not at all easy to add it.

So, the problem of the encoding format needs to be solved regardless
of which implementation is actually processing the overlays.

-- 
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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