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

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Message-ID: <20250409161444.6158d388@windsurf>
Date: Wed, 9 Apr 2025 16:14:44 +0200
From: Thomas Petazzoni <thomas.petazzoni@...tlin.com>
To: Andrew Lunn <andrew@...n.ch>
Cc: 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
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 Arnd Bergmann <arnd@...db.de>, Rob Herring <robh@...nel.org>, Saravana
 Kannan <saravanak@...gle.com>, Bjorn Helgaas <bhelgaas@...gle.com>, Mark
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 <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 16:04:51 +0200
Andrew Lunn <andrew@...n.ch> wrote:

> And you need some way to map the PCI ID to the correct .dtso file.
> Maybe that is just a lookup table in the driver, or maybe you can pack
> the .dtso file into a kernel module with the correct
> MODULE_DEVICE_TABLE(pci, ...) so that PCI probing pulls in the
> specific driver module with the .dtso, which via dependencies pulls in
> the core driver which can actually make use of the .dtso?

Well, check the already upstream driver:

  https://elixir.bootlin.com/linux/v6.13.7/source/drivers/misc/lan966x_pci.c

It indeed binds on the PCI ID, and the driver bundles the .dtbo.

Best regards,

Thomas
-- 
Thomas Petazzoni, co-owner and CEO, Bootlin
Embedded Linux and Kernel engineering and training
https://bootlin.com