linux-kernel - Re: Hotplug hardware with (un)loadable DT overlays

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Date: Tue, 30 Apr 2024 10:51:30 +0200
From: Herve Codina <herve.codina@...tlin.com>
To: Luca Ceresoli <luca.ceresoli@...tlin.com>
Cc: "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>, Krzysztof
 Kozlowski <krzysztof.kozlowski@...aro.org>, Bartosz Golaszewski
 <brgl@...ev.pl>, Doug Anderson <dianders@...omium.org>, Chen-Yu Tsai
 <wenst@...omium.org>, Matt Coster <Matt.Coster@...tec.com>, Thomas
 Petazzoni <thomas.petazzoni@...tlin.com>, Alexandre Belloni
 <alexandre.belloni@...tlin.com>, Maxime Chevallier
 <maxime.chevallier@...tlin.com>, Rob Herring <robh@...nel.org>, Conor
 Dooley <conor@...nel.org>, Saravana Kannan <saravanak@...gle.com>,
 linux-kernel@...r.kernel.org
Subject: Re: Hotplug hardware with (un)loadable DT overlays - unconference
 meeting notes

Hi,

On Fri, 26 Apr 2024 11:51:41 +0200
Luca Ceresoli <luca.ceresoli@...tlin.com> wrote:

..

> One use case is for the LAN966x, a classic SoC that can be however be
> started in "endpoint mode", i.e. with the CPU cores deactivated and a
> PCI endpoint that allows an external CPU to access all the peripherals
> over PCIe. In practice the whole SoC would be used as a peripheral chip
> providing lots of devices for another SoC where the OS runs. This use
> case has been described by Rob Herring and Lizhi Hou at LPC 2023 [4][5].
> 

FYI, I sent upstream the first iteration of the series adding minimal
support the LAN966x PCI device driver.
  https://lore.kernel.org/lkml/20240430083730.134918-1-herve.codina@bootlin.com/

This driver binds on the LAN996x PCI VID/PID, and when probed, loads a DT
overlay to instantiates all internal devices re-using all existing drivers
with no change.

Best regards,
Hervé