linux-kernel - Re: [PATCH v2 05/20] drm/tilcdc: Convert legacy panel binding via DT overlay at boot time

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Message-ID: <20260106083426.6916d687@bootlin.com>
Date: Tue, 6 Jan 2026 08:34:26 +0100
From: Herve Codina <herve.codina@...tlin.com>
To: Kory Maincent <kory.maincent@...tlin.com>
Cc: "Luca Ceresoli" <luca.ceresoli@...tlin.com> (by way of Kory Maincent
 <kory.maincent@...tlin.com>), "Jyri Sarha" <jyri.sarha@....fi>, "Tomi
 Valkeinen" <tomi.valkeinen@...asonboard.com>, "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>, "Rob Herring"
 <robh@...nel.org>, "Krzysztof Kozlowski" <krzk+dt@...nel.org>, "Conor
 Dooley" <conor+dt@...nel.org>, "Russell King" <linux@...linux.org.uk>,
 "Bartosz Golaszewski" <brgl@...ev.pl>, "Tony Lindgren" <tony@...mide.com>,
 "Andrzej Hajda" <andrzej.hajda@...el.com>, "Neil Armstrong"
 <neil.armstrong@...aro.org>, "Robert Foss" <rfoss@...nel.org>, "Laurent
 Pinchart" <Laurent.pinchart@...asonboard.com>, "Jonas Karlman"
 <jonas@...boo.se>, "Jernej Skrabec" <jernej.skrabec@...il.com>, "Markus
 Schneider-Pargmann" <msp@...libre.com>, "Bajjuri Praneeth"
 <praneeth@...com>, "Louis Chauvet" <louis.chauvet@...tlin.com>, "Thomas
 Petazzoni" <thomas.petazzoni@...tlin.com>, "Miguel Gazquez"
 <miguel.gazquez@...tlin.com>, <dri-devel@...ts.freedesktop.org>,
 <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
 <linux-arm-kernel@...ts.infradead.org>, <linux-omap@...r.kernel.org>
Subject: Re: [PATCH v2 05/20] drm/tilcdc: Convert legacy panel binding via
 DT overlay at boot time

Hi Köry,

On Mon, 5 Jan 2026 18:18:38 +0100
Kory Maincent <kory.maincent@...tlin.com> wrote:

...
> >
> > Modifying some properties after applying the overlay could be not seen by the
> > driver.  
> 
> I disagree here. This driver is loaded at subsys_initcall (initcall 4) while
> the panel is loaded at device_initcall (initcall 6) so the panel driver won't
> probe in-between.
> 

You're right. the driver registers at device_initcall().
You can modify your node at subsys_initcall(), the driver will see modified
values.

Best regards,
Hervé