linux-kernel - Re: [PATCH v3 05/22] drm/tilcdc: Convert legacy panel binding via DT overlay at boot time

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Message-ID: <20260107105711.695a9c12@kmaincent-XPS-13-7390>
Date: Wed, 7 Jan 2026 10:57:11 +0100
From: Kory Maincent <kory.maincent@...tlin.com>
To: Andrew Davis <afd@...com>
Cc: 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>,
 Luca Ceresoli <luca.ceresoli@...tlin.com>, Louis Chauvet
 <louis.chauvet@...tlin.com>, Thomas Petazzoni
 <thomas.petazzoni@...tlin.com>, Miguel Gazquez
 <miguel.gazquez@...tlin.com>, Herve Codina <herve.codina@...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 v3 05/22] drm/tilcdc: Convert legacy panel binding via
 DT overlay at boot time

On Tue, 6 Jan 2026 13:38:37 -0600
Andrew Davis <afd@...com> wrote:

> On 1/6/26 11:42 AM, Kory Maincent (TI.com) wrote:
> > To maintain backward compatibility while removing the deprecated
> > tilcdc_panel driver, add a tilcdc_panel_legacy subdriver that converts
> > the legacy "ti,tilcdc,panel" devicetree binding to the standard
> > panel-dpi binding at early boot.

...

> > +	dtbo_start = __dtbo_tilcdc_panel_legacy_begin;
> > +	dtbo_size = __dtbo_tilcdc_panel_legacy_end -
> > +		    __dtbo_tilcdc_panel_legacy_begin;
> > +
> > +	ret = of_overlay_fdt_apply(dtbo_start, dtbo_size, &ovcs_id, NULL);
> > +	if (ret)
> > +		return ret;  
> 
> Looking over the users of `of_overlay_fdt_apply()` they all seem
> to start with a begin and end address, then have to convert to start
> and size. I wonder if this function should be converted to just take
> begin and end addresses instead.. (not a problem for this series, just
> thinking out loud).

Indeed, I think you are right.

Regards,
-- 
Köry Maincent, Bootlin
Embedded Linux and kernel engineering
https://bootlin.com