linux-kernel - Re: [PATCH v3 03/14] software node: Implement device_get_match

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Message-ID: <ljqd5ovcsg7t62tdzd77w5mv5buawm3x7xyapy7n7l7azcaorh@tytj46t2lxyb>
Date: Mon, 12 Jan 2026 22:01:23 +0530
From: Manivannan Sadhasivam <mani@...nel.org>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc: Dmitry Torokhov <dmitry.torokhov@...il.com>, 
	manivannan.sadhasivam@....qualcomm.com, 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>, 
	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, 
	Sui Jingfeng <sui.jingfeng@...ux.dev>
Subject: Re: [PATCH v3 03/14] software node: Implement device_get_match_data
 fwnode callback

On Mon, Jan 12, 2026 at 02:32:21PM +0530, Manivannan Sadhasivam wrote:
> On Mon, Jan 12, 2026 at 10:27:45AM +0200, Andy Shevchenko wrote:
> > On Mon, Jan 12, 2026 at 01:49:54PM +0530, Manivannan Sadhasivam wrote:
> > > + Dmitry Torokhov (who was against this patch previously)
> > > 
> > > On Mon, Jan 12, 2026 at 09:56:06AM +0200, Andy Shevchenko wrote:
> > > > On Sat, Jan 10, 2026 at 12:26:21PM +0530, Manivannan Sadhasivam via B4 Relay wrote:
> > > > 
> > > > > Because the software node backend of the fwnode API framework lacks an
> > > > > implementation for the .device_get_match_data function callback.
> > > > 
> > > > Maybe this is done on purpose. Have you thought about this aspect?
> > > 
> > > IMO, software nodes were introduced to add sub-properties to the existing
> > > firmware nodes, but it has usecase/potential to go beyond that. More below.
> > 
> > Potential doesn't mean the necessity.
> > 
> > > > > This makes it difficult to use(and/or test) a few drivers that originates
> > > > > from DT world on the non-DT platform.
> > > > 
> > > > How difficult? DSA implementation went to the way of taking DT overlay
> > > > approach. Why that one can't be applied here?
> > > 
> > > Sometimes you do not have any DT node at all.
> > 
> > Yes, that is exactly the case I have referred to. The PCI core (in Linux)
> > is able to create DT subtree on non-OF based platforms.
> > 
> 
> Maybe I should look into creating dynamic DT node for the device and insert it
> to the uart node. Theoretically it should work.
> 

It worked flawlessly. So I sent v4 incorporating this design:
https://lore.kernel.org/linux-pci/20260112-pci-m2-e-v4-0-eff84d2c6d26@oss.qualcomm.com/

Thanks!

- Mani

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