linux-kernel - Re: [PATCH 3/9] software node: allow referencing firmware nodes

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Message-ID: <CAMRc=McBTgnQXkPoOUYC=PDDwFXuVqfMFuiwZTW7ODb6owJbeg@mail.gmail.com>
Date: Mon, 20 Oct 2025 13:26:59 +0200
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc: Linus Walleij <linus.walleij@...aro.org>, Daniel Scally <djrscally@...il.com>, 
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>, 
	Sakari Ailus <sakari.ailus@...ux.intel.com>, 
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>, "Rafael J. Wysocki" <rafael@...nel.org>, 
	Danilo Krummrich <dakr@...nel.org>, Philipp Zabel <p.zabel@...gutronix.de>, 
	Krzysztof Kozlowski <krzk@...nel.org>, linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-acpi@...r.kernel.org, 
	Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [PATCH 3/9] software node: allow referencing firmware nodes

On Mon, Oct 20, 2025 at 12:05 PM Andy Shevchenko
<andriy.shevchenko@...ux.intel.com> wrote:
>
> > >
> > > Can't we always have an fwnode reference?
> >
> > Unfortunately no. A const struct software_node is not yet a full
> > fwnode, it's just a template that becomes an actual firmware node when
> > it's registered with the swnode framework. However in order to allow
> > creating a graph of software nodes before we register them, we need a
> > way to reference those templates and then look them up internally in
> > swnode code.
>
> Strange that you need this way. The IPU3 bridge driver (that creates a graph of
> fwnodes at run-time for being consumed by the respective parts of v4l2
> framework) IIRC has no such issue. Why your case is different?
>

>From what I can tell the ipu-bridge driver only references software
nodes (as struct software_node) from other software nodes. I need to
reference ANY implementation of firmware node from a software node.

Bartosz