linux-kernel - Re: [RFC PATCH v2 0/2] fw

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Date: Tue, 9 Apr 2024 15:02:47 +0200
From: Herve Codina <herve.codina@...tlin.com>
To: Saravana Kannan <saravanak@...gle.com>
Cc: Geert Uytterhoeven <geert+renesas@...der.be>, Rob Herring
 <robh@...nel.org>, kernel-team@...roid.com, linux-kernel@...r.kernel.org,
 imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
 linux-i2c@...r.kernel.org, devicetree@...r.kernel.org,
 linux-spi@...r.kernel.org, linux-acpi@...r.kernel.org, Luca Ceresoli
 <luca.ceresoli@...tlin.com>, Thomas Petazzoni
 <thomas.petazzoni@...tlin.com>
Subject: Re: [RFC PATCH v2 0/2] fw_devlink overlay fix

Hi Saravana,

+CC Luca and Thomas

On Mon,  8 Apr 2024 22:37:01 -0700
Saravana Kannan <saravanak@...gle.com> wrote:

> Don't bother reviewing this patch. It needs to be tested and possibly
> refactored first.
> 
> Geert and Herve,
> 
> This patch serious should hopefully fix both of your use cases
> [1][2][3]. Can you please check to make sure the device links created
> to/from the overlay devices are to/from the right ones?
> 
> I've only compile tested it. If I made some obvious mistake, feel free
> to fix it and give it a shot.
> 
> Cc: Rob Herring <robh@...nel.org>
> 
> [1] - https://lore.kernel.org/lkml/CAMuHMdXEnSD4rRJ-o90x4OprUacN_rJgyo8x6=9F9rZ+-KzjOg@mail.gmail.com/
> [2] - https://lore.kernel.org/all/20240221095137.616d2aaa@bootlin.com/
> [3] - https://lore.kernel.org/lkml/20240312151835.29ef62a0@bootlin.com/
> 

I tested your patches.

Concerning my use cases, they fix the issue described in
  https://lore.kernel.org/all/20240221095137.616d2aaa@bootlin.com/

But not the one described in
  https://lore.kernel.org/lkml/20240312151835.29ef62a0@bootlin.com/
A link is still present between the i2c@600 and the PCI device.
instead of the i2c@600 and the pci-ep-bus.

Adding the patch clearing the FWNODE_FLAG_NOT_DEVICE in device_add() available
at [1] on top of your patches fixes the link issue.
With this additional patch applied, the link is present between the i2c@600
and the pci-ep-bus.

[1] https://lore.kernel.org/lkml/20240220111044.133776-2-herve.codina@bootlin.com/

Best regards,
Hervé