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

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Message-ID: <CAMuHMdVtrmh207usW45c0v5EmxgM+JgfQ=m55tXXNT0m4o5aGg@mail.gmail.com>
Date: Wed, 9 Apr 2025 10:27:05 +0200
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Cc: Andrew Lunn <andrew@...n.ch>, Herve Codina <herve.codina@...tlin.com>, 
	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>
Subject: Re: [PATCH 15/16] misc: lan966x_pci: Add dtso nodes in order to
 support SFPs

On Wed, 9 Apr 2025 at 09:44, Thomas Petazzoni
<thomas.petazzoni@...tlin.com> wrote:
> On Tue Apr 8, 2025 at 5:38 PM CEST, Andrew Lunn wrote:
> > "HW blocks inside an SoC." That would be the SoC .dtsi file. Anything
> > outside of the SoC is in the .dts file. OEM vendors take the SoC,
> > build a board around it, and name there .dts file after the board,
> > describing how the board components are connected to the SoC.
> >
> > So..
> >
> > So by PCI endpoint, you mean the PCIe chip? So it sounds like there
> > should be a .dtsi file describing the chip.
> >
> > Everything outside of the chip, like the SFP cages, are up to the
> > vendor building the board. I would say that should be described in a
> > .dtso file, which describes how the board components are connected to
> > the PCIe chip? And that .dtso file should be named after the board,
> > since there are going to many of them, from different OEM vendors.
>
> Indeed, that makes sense. So if I get correctly your suggestion,
> instead of having a .dtso that describes everything, it should be
> split between:
>
>  - A .dtsi that describes what's inside the LAN996x when used in PCI
>    endpoint mode
>
>  - A .dtso that includes the above .dtsi, and that describes what on
>    the PCI board around the LAN966x.
>
> Correct?

Sounds good to me!

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds