linux-kernel - Re: [PATCH 15/16] misc: lan966x_pci: Add dtso nodes in order to support SFPs

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Message-ID: <e370fcd3-bd58-47d1-bc0c-c0abeebbefdc@lunn.ch>
Date: Tue, 8 Apr 2025 16:45:18 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Herve Codina <herve.codina@...tlin.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Danilo Krummrich <dakr@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...nel.org>, Andi Shyti <andi.shyti@...nel.org>,
	Wolfram Sang <wsa+renesas@...g-engineering.com>,
	Peter Rosin <peda@...ntia.se>,
	Derek Kiernan <derek.kiernan@....com>,
	Dragan Cvetic <dragan.cvetic@....com>,
	Arnd Bergmann <arnd@...db.de>, Rob Herring <robh@...nel.org>,
	Saravana Kannan <saravanak@...gle.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Mark Brown <broonie@...nel.org>, Len Brown <lenb@...nel.org>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Daniel Scally <djrscally@...il.com>,
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	Sakari Ailus <sakari.ailus@...ux.intel.com>,
	Wolfram Sang <wsa@...nel.org>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	linux-kernel@...r.kernel.org, imx@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org, linux-clk@...r.kernel.org,
	linux-i2c@...r.kernel.org, devicetree@...r.kernel.org,
	linux-pci@...r.kernel.org, linux-spi@...r.kernel.org,
	linux-acpi@...r.kernel.org,
	Allan Nielsen <allan.nielsen@...rochip.com>,
	Horatiu Vultur <horatiu.vultur@...rochip.com>,
	Steen Hegelund <steen.hegelund@...rochip.com>,
	Luca Ceresoli <luca.ceresoli@...tlin.com>,
	Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH 15/16] misc: lan966x_pci: Add dtso nodes in order to
 support SFPs

On Tue, Apr 08, 2025 at 04:26:03PM +0200, Herve Codina wrote:
> Hi Andrew,
> 
> On Mon, 7 Apr 2025 22:05:31 +0200
> Andrew Lunn <andrew@...n.ch> wrote:
> 
> > On Mon, Apr 07, 2025 at 04:55:44PM +0200, Herve Codina wrote:
> > > Add device-tree nodes needed to support SFPs.
> > > Those nodes are:
> > >  - the clock controller
> > >  - the i2c controller
> > >  - the i2c mux
> > >  - the SFPs themselves and their related ports in the switch
> > > 
> > > Signed-off-by: Herve Codina <herve.codina@...tlin.com>
> > > ---
> > >  drivers/misc/lan966x_pci.dtso | 111 ++++++++++++++++++++++++++++++++++
> > >  1 file changed, 111 insertions(+)
> > > 
> > > diff --git a/drivers/misc/lan966x_pci.dtso b/drivers/misc/lan966x_pci.dtso
> > > index 94a967b384f3..a2015b46cd44 100644
> > > --- a/drivers/misc/lan966x_pci.dtso
> > > +++ b/drivers/misc/lan966x_pci.dtso  
> > 
> > What exactly does this DTSO file represent?
> 
> The dsto represents de board connected to the PCI slot and identified
> by its PCI vendor/device IDs.

Then i think the name lan966x_pci.dtso is too generic. It should be
named after whatever microchip calls the RDK.

> We can move the PCI chip in a dtsi included by this dtso but in the
> end this leads to the exact same representation. Further more, moving
> out the PCI chip description in its own dtsi out of this dtso can be
> done in a second step when an other dtso uses the same chip.

And what would you call this pulled out dtsi file? lan966x_pci.dtsi?
That is going to be confusing.

Naming is hard, but we should assume this PCIe device is going to be
successful, and a number of OEMs will build cards around it, so there
needs to be space within the naming scheme for them.

	Andrew