linux-kernel - Re: Device tree representation of (hotplug) connectors: discussion at ELCE

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Message-ID: <CAMuHMdWmJcwy8YUqfeBT+B79a19YeW77Ms6KjNhKGY8935tTog@mail.gmail.com>
Date: Mon, 8 Sep 2025 11:01:42 +0200
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: David Gibson <david@...son.dropbear.id.au>
Cc: Ayush Singh <ayush@...gleboard.org>, Luca Ceresoli <luca.ceresoli@...tlin.com>, 
	Krzysztof Kozlowski <krzk@...nel.org>, devicetree@...r.kernel.org, Rob Herring <robh@...nel.org>, 
	Jason Kridner <jkridner@...il.com>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
	Conor Dooley <conor+dt@...nel.org>, devicetree-compiler@...r.kernel.org, 
	linux-kernel@...r.kernel.org, Thomas Petazzoni <thomas.petazzoni@...tlin.com>, 
	Herve Codina <herve.codina@...tlin.com>, Andrew Davis <afd@...com>
Subject: Re: Device tree representation of (hotplug) connectors: discussion at ELCE

Hi David,

On Mon, 8 Sept 2025 at 06:36, David Gibson <david@...son.dropbear.id.au> wrote:
> On Thu, Sep 04, 2025 at 11:15:44AM +0530, Ayush Singh wrote:
> > I would need to wrap my head around this a bit, specially in context of
> > chaining connectors. It does seem like it will still require the points you
> > mentioned above to be present in one form or another, i.e. some way to
> > extend busses to different nodes/trees and connector (even a chained one)
> > local symbols/aliases.
>
> Yes, it would still require those mappings.  I don't think chained
> connectors introduce a lot of extra complication.  An intermediate
> connector would need to be able to "re-export" things it got from its
> parent connector to its child connector(s) - renaming them if
> necessary.

I don't expect chained connectors to be complicated.
Boards using multiple-connectors may be more difficult, e.g.
https://1bitsquared.de/products/pmod-hyperram


Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-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