netdev - Re: [PATCH v3 6/7] mfd: Add support for LAN966x PCI device

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Message-Id: <7289bb54-99f2-4630-a437-21997a9e2b1f@app.fastmail.com>
Date: Tue, 16 Jul 2024 16:44:12 +0200
From: "Arnd Bergmann" <arnd@...db.de>
To: "Herve Codina" <herve.codina@...tlin.com>
Cc: "Rob Herring" <robh@...nel.org>, "Conor Dooley" <conor+dt@...nel.org>,
 "Conor Dooley" <conor@...nel.org>,
 "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
 "Lee Jones" <lee@...nel.org>,
 "Andy Shevchenko" <andy.shevchenko@...il.com>,
 "Simon Horman" <horms@...nel.org>,
 "Krzysztof Kozlowski" <krzk+dt@...nel.org>, UNGLinuxDriver@...rochip.com,
 "Saravana Kannan" <saravanak@...gle.com>,
 "Bjorn Helgaas" <bhelgaas@...gle.com>,
 "Philipp Zabel" <p.zabel@...gutronix.de>,
 "Lars Povlsen" <lars.povlsen@...rochip.com>,
 "Steen Hegelund" <Steen.Hegelund@...rochip.com>,
 "Daniel Machon" <daniel.machon@...rochip.com>,
 "David S . Miller" <davem@...emloft.net>,
 "Eric Dumazet" <edumazet@...gle.com>, "Jakub Kicinski" <kuba@...nel.org>,
 "Paolo Abeni" <pabeni@...hat.com>,
 "Horatiu Vultur" <horatiu.vultur@...rochip.com>,
 "Andrew Lunn" <andrew@...n.ch>, devicetree@...r.kernel.org,
 Netdev <netdev@...r.kernel.org>, linux-pci@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org,
 "Allan Nielsen" <allan.nielsen@...rochip.com>,
 "Luca Ceresoli" <luca.ceresoli@...tlin.com>,
 "Thomas Petazzoni" <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH v3 6/7] mfd: Add support for LAN966x PCI device

On Mon, Jul 15, 2024, at 14:12, Herve Codina wrote:
> Hi Arnd,
>
> On Fri, 12 Jul 2024 16:14:31 +0200
> "Arnd Bergmann" <arnd@...db.de> wrote:
>
>> On Fri, Jul 12, 2024, at 15:11, Herve Codina wrote:
>> > On Thu, 11 Jul 2024 14:33:26 -0600 Rob Herring <robh@...nel.org> wrote:  
>> >> On Thu, Jul 11, 2024 at 1:08 PM Greg Kroah-Hartman <gregkh@...uxfoundation.org> wrote:  
>> 
>> >> > >
>> >> > > This PCI driver purpose is to instanciate many other drivers using a DT
>> >> > > overlay. I think MFD is the right subsystem.    
>> >> 
>> >> It is a Multi-function Device, but it doesn't appear to use any of the
>> >> MFD subsystem. So maybe drivers/soc/? Another dumping ground, but it
>> >> is a driver for an SoC exposed as a PCI device.
>> >>   
>> >
>> > In drivers/soc, drivers/soc/microchip/ could be the right place.
>> >
>> > Conor, are you open to have the PCI LAN966x device driver in
>> > drivers/soc/microchip/ ?  
>> 
>> That sounds like a much worse fit than drivers/mfd: the code
>> here does not actually run on the lan966x soc, it instead runs
>> on whatever other machine you happen to plug it into as a
>> PCI device.
>
> Maybe drivers/misc ?

That's probably a little better, and there is already
drivers/misc/mchp_pci1xxxx in there, which also has some
aux devices.

Maybe we need a new place and then move both of these
and some of the similar devices from drivers/mfd to that, but
we don't really have to pick one now.

   Arnd