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

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Message-ID: <20240712151122.67a17a94@bootlin.com>
Date: Fri, 12 Jul 2024 15:11:22 +0200
From: Herve Codina <herve.codina@...tlin.com>
To: Rob Herring <robh@...nel.org>, Conor Dooley <conor+dt@...nel.org>, Conor
 Dooley <conor@...nel.org>
Cc: 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>, Arnd Bergmann
 <arnd@...db.de>, 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@...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

Hi Rob, Conor,

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:
> >
> > On Thu, Jul 11, 2024 at 06:44:38PM +0200, Herve Codina wrote:  
> > > Hi Lee,
> > >
> > > On Thu, 11 Jul 2024 16:29:52 +0100
> > > Lee Jones <lee@...nel.org> wrote:
> > >  
> > > > On Thu, 27 Jun 2024, Herve Codina wrote:
> > > >  
> > > > > Add a PCI driver that handles the LAN966x PCI device using a device-tree
> > > > > overlay. This overlay is applied to the PCI device DT node and allows to
> > > > > describe components that are present in the device.
> > > > >
> > > > > The memory from the device-tree is remapped to the BAR memory thanks to
> > > > > "ranges" properties computed at runtime by the PCI core during the PCI
> > > > > enumeration.
> > > > >
> > > > > The PCI device itself acts as an interrupt controller and is used as the
> > > > > parent of the internal LAN966x interrupt controller to route the
> > > > > interrupts to the assigned PCI INTx interrupt.  
> > > >
> > > > Not entirely sure why this is in MFD.  
> > >
> > > 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/ ?

Best regards,
Hervé