linux-kernel - Re: [PATCH v1 06/35] drm/connector: Only register TV mode property if present

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Message-ID: <d56c3ff4-8a14-0467-2b61-d559dc936dda@tronnes.org>
Date:   Mon, 15 Aug 2022 12:49:37 +0200
From:   Noralf Trønnes <noralf@...nnes.org>
To:     Maxime Ripard <maxime@...no.tech>
Cc:     Jernej Skrabec <jernej.skrabec@...il.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Jerome Brunet <jbrunet@...libre.com>,
        Samuel Holland <samuel@...lland.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Daniel Vetter <daniel@...ll.ch>, Emma Anholt <emma@...olt.net>,
        David Airlie <airlied@...ux.ie>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Kevin Hilman <khilman@...libre.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        linux-sunxi@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Phil Elwell <phil@...pberrypi.com>,
        Mateusz Kwiatkowski <kfyatek+publicgit@...il.com>,
        linux-arm-kernel@...ts.infradead.org,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Dave Stevenson <dave.stevenson@...pberrypi.com>,
        linux-amlogic@...ts.infradead.org, dri-devel@...ts.freedesktop.org,
        Dom Cobley <dom@...pberrypi.com>,
        Noralf Trønnes <noralf@...nnes.org>
Subject: Re: [PATCH v1 06/35] drm/connector: Only register TV mode property if
 present



Den 15.08.2022 12.40, skrev Maxime Ripard:
> Hi,
> 
> On Mon, Aug 08, 2022 at 02:49:08PM +0200, Noralf Trønnes wrote:
>> Den 29.07.2022 18.34, skrev Maxime Ripard:
>>> The drm_create_tv_properties() will create the TV mode property
>>> unconditionally.
>>>
>>> However, since we'll gradually phase it out, let's register it only if we
>>> have a list passed as an argument. This will make the transition easier.
>>>
>>> Signed-off-by: Maxime Ripard <maxime@...no.tech>
>>>
>>
>> I don't understand why this makes the transition easier, but if you
>> think so:
> 
> So the basic idea behind this series was to introduce the new property,
> gradually convert the old drivers to the new one, and finally remove the
> old one.
> 
> In order to keep the backward compatibility, we need to add to the
> drivers some custom get/set_property hook to expose the old property and
> fill the new one if needed.
> 
> That means that each driver would have to create the old property, which
> will conflict with that code
> 

Got it.

Noralf.