linux-kernel - Re: [PATCH v3 04/14] software node: Add software_node_match

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Message-ID: <CAMRc=Md6+hhLMOmmDejKW+_jbWu3_XB4qNobyi27pezfXsVLFw@mail.gmail.com>
Date: Mon, 12 Jan 2026 06:03:34 -0500
From: Bartosz Golaszewski <brgl@...nel.org>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc: Rob Herring <robh@...nel.org>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
	Jiri Slaby <jirislaby@...nel.org>, Nathan Chancellor <nathan@...nel.org>, 
	Nicolas Schier <nicolas.schier@...ux.dev>, Hans de Goede <hansg@...nel.org>, 
	Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>, 
	Mark Pearson <mpearson-lenovo@...ebb.ca>, "Derek J. Clark" <derekjohn.clark@...il.com>, 
	Manivannan Sadhasivam <mani@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Marcel Holtmann <marcel@...tmann.org>, Luiz Augusto von Dentz <luiz.dentz@...il.com>, 
	Bartosz Golaszewski <brgl@...ev.pl>, Daniel Scally <djrscally@...il.com>, 
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>, 
	Sakari Ailus <sakari.ailus@...ux.intel.com>, "Rafael J. Wysocki" <rafael@...nel.org>, 
	Danilo Krummrich <dakr@...nel.org>, Bartosz Golaszewski <brgl@...nel.org>, linux-serial@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-kbuild@...r.kernel.org, 
	platform-driver-x86@...r.kernel.org, linux-pci@...r.kernel.org, 
	devicetree@...r.kernel.org, linux-arm-msm@...r.kernel.org, 
	linux-bluetooth@...r.kernel.org, linux-pm@...r.kernel.org, 
	Stephan Gerhold <stephan.gerhold@...aro.org>, 
	Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>, linux-acpi@...r.kernel.org, 
	manivannan.sadhasivam@....qualcomm.com
Subject: Re: [PATCH v3 04/14] software node: Add software_node_match_device() API

On Mon, 12 Jan 2026 09:31:44 +0100, Andy Shevchenko
<andriy.shevchenko@...ux.intel.com> said:
> On Sat, Jan 10, 2026 at 12:26:22PM +0530, Manivannan Sadhasivam via B4 Relay wrote:
>
>> Add software_node_match_device() API to match the swnode device with the
>> swnode driver. The matching is based on the compatible property in the
>> device and the driver's of_match_table.
>
> NAK. swnodes != real firmware nodes.
>

While I'm not arguing that this is *the* solution, I think it warrants
a discussion on proper matching of devices that are only backed by a software
node - for instance a serdev device on the auxiliary bus. I understand what
software nodes were historically but perhaps it's time to extend their role as
a full-blown firmware node allowing matching with drivers.

Reusing existing OF IDs is just one way, we could potentially think about a
high-level fwnode-based device to driver matching?

Bartosz