linux-kernel - Re: [PATCH v3 02/10] software node: increase the reference of the swnode by its fwnode

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Message-ID: <aQSFDhUp89xul2AP@smile.fi.intel.com>
Date: Fri, 31 Oct 2025 11:44:46 +0200
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Bartosz Golaszewski <brgl@...ev.pl>
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 v3 02/10] software node: increase the reference of the
 swnode by its fwnode

On Fri, Oct 31, 2025 at 10:03:47AM +0100, Bartosz Golaszewski wrote:
> On Fri, Oct 31, 2025 at 9:30 AM Andy Shevchenko
> <andriy.shevchenko@...ux.intel.com> wrote:
> > On Thu, Oct 30, 2025 at 03:33:02AM -0700, Bartosz Golaszewski wrote:
> > > On Thu, 30 Oct 2025 10:34:46 +0100, Andy Shevchenko
> > > <andriy.shevchenko@...ux.intel.com> said:

...

> > > Andy: the resulting code after patch 3/10 looks like this:
> > >
> > > struct fwnode_handle *refnode;
> > >
> > > (...)
> >
> > Let's say something like below to be put here
> >
> > /*
> >  * The reference in software node may refer to a node of a different type.
> >  * Depending on the type we choose either to use software node directly, or
> >  * delegate that to fwnode API.
> >  */
> 
> But this is incorrect: we're not really doing that. We either use the
> firmware node reference directly OR cast the software node to its
> firmware node representation. We ALWAYS use the firmware node API
> below.
> 
> This really *is* evident from the code but if it'll make you happy and
> make you sign off on this, I'll add a corrected version.

The comment should answer to the Q: "Why the heck are we calling fwnode APIs here?"

> IMO It's completely redundant.

This is unusual case for swnode API (see other functions, they call directly
the low-level implementation instead of going to a round via fwnode). That's
why I insist on a comment of this piece. It may be obvious for you, but the
unprepared read would be surprised by this inconsistency.

-- 
With Best Regards,
Andy Shevchenko