linux-kernel - Re: [PATCH] drm: display: Set fwnode for aux bus devices

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Message-ID: <7a8dede1-ef29-4553-9412-de8e2f45b860@notapiano>
Date: Wed, 23 Oct 2024 15:55:56 -0400
From: Nícolas F. R. A. Prado <nfraprado@...labora.com>
To: Saravana Kannan <saravanak@...gle.com>
Cc: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	Jon Hunter <jonathanh@...dia.com>, kernel-team@...roid.com,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH] drm: display: Set fwnode for aux bus devices

On Wed, Oct 23, 2024 at 12:13:36PM -0700, Saravana Kannan wrote:
> fwnode needs to be set for a device for fw_devlink to be able to
> track/enforce its dependencies correctly. Without this, you'll see error
> messages like this when the supplier has probed and tries to make sure
> all its fwnode consumers are linked to it using device links:
> 
> mediatek-drm-dp 1c500000.edp-tx: Failed to create device link (0x180) with backlight-lcd0
> tegra-xusb-padctl 3520000.padctl: Failed to create device link (0x180) with 1-0008
> 
> Reported-by: "Nícolas F. R. A. Prado" <nfraprado@...labora.com>
> Closes: https://lore.kernel.org/all/7b995947-4540-4b17-872e-e107adca4598@notapiano/
> Tested-by: "Nícolas F. R. A. Prado" <nfraprado@...labora.com>
> Reported-by: Jon Hunter <jonathanh@...dia.com>
> Closes: https://lore.kernel.org/all/20240910130019.35081-1-jonathanh@nvidia.com/

Hi Saravana,

the issue faced by Jon needs the exact same change but in a different place,
drivers/phy/tegra/xusb.c, which I posted at:
https://lore.kernel.org/all/f979aff2-34f4-4f6d-bb9a-03a02afc4635@notapiano/

So we need two separate patches, one for each issue. Feel free to add that to
this series. (I could send it myself, but I think it makes more sense to keep
them together)

Thanks,
Nícolas