linux-kernel - Re: [PATCH 6/9] serdev: Skip registering serdev devices from DT is external connector is used

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Message-ID: <CAL_JsqLoD5GiiGgWTEa6-g8VwyuPTko-ewe5CKPBWMgHDnKaHg@mail.gmail.com>
Date: Thu, 20 Nov 2025 10:22:16 -0600
From: Rob Herring <robh@...nel.org>
To: Manivannan Sadhasivam <mani@...nel.org>
Cc: manivannan.sadhasivam@....qualcomm.com, 
	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>, 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>
Subject: Re: [PATCH 6/9] serdev: Skip registering serdev devices from DT is
 external connector is used

On Wed, Nov 19, 2025 at 7:33 AM Manivannan Sadhasivam <mani@...nel.org> wrote:
>
> On Tue, Nov 18, 2025 at 07:03:51AM -0600, Rob Herring wrote:
> > On Wed, Nov 12, 2025 at 8:45 AM Manivannan Sadhasivam via B4 Relay
> > <devnull+manivannan.sadhasivam.oss.qualcomm.com@...nel.org> wrote:
> > >
> > > From: Manivannan Sadhasivam <manivannan.sadhasivam@....qualcomm.com>
> > >
> > > If an external connector like M.2 is connected to the serdev controller
> > > in DT, then the serdev devices will be created dynamically by the connector
> > > driver. So skip registering devices from DT node as there will be no
> > > statically defined devices.
> >
> > You could still have statically defined devices. You are just choosing
> > to probe them later from the connector driver.
> >
>
> The point of coming up with the M.2 binding is to avoid hardcoding the devices
> in DT. So static devices are ruled out IMO.

Until you have any one of the reasons we have PCIe devices described
even when in a standard slot. Take your pick. An ethernet adapter that
omits an EEPROM for the MAC address.

Rob