linux-kernel - Re: [PATCH v2 8/8] [RFC] drm/ingenic: convert to component framework for jz4780 hdmi

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Message-Id: <8XJDXQ.X70C5WOD0QB7@crapouillou.net>
Date:   Thu, 05 Aug 2021 18:17:32 +0200
From:   Paul Cercueil <paul@...pouillou.net>
To:     "H. Nikolaus Schaller" <hns@...delico.com>
Cc:     Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Kees Cook <keescook@...omium.org>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Robert Foss <robert.foss@...aro.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Ezequiel Garcia <ezequiel@...labora.com>,
        Harry Wentland <harry.wentland@....com>,
        Sam Ravnborg <sam@...nborg.org>,
        Maxime Ripard <maxime@...no.tech>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        devicetree@...r.kernel.org, linux-mips@...r.kernel.org,
        linux-kernel@...r.kernel.org, letux-kernel@...nphoenux.org,
        Paul Boddie <paul@...die.org.uk>,
        Jonas Karlman <jonas@...boo.se>,
        dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH v2 8/8] [RFC] drm/ingenic: convert to component framework
 for jz4780 hdmi

Hi Nikolaus and Laurent,

Le jeu., août 5 2021 at 18:07:20 +0200, H. Nikolaus Schaller 
<hns@...delico.com> a écrit :
> Hi Laurent,
> 
>>  Am 05.08.2021 um 17:04 schrieb Laurent Pinchart 
>> <laurent.pinchart@...asonboard.com>:
>> 
>>  Hi Nikolaus,
>> 
>>  Thank you for the patch.
>> 
>>  On Thu, Aug 05, 2021 at 04:07:57PM +0200, H. Nikolaus Schaller 
>> wrote:
>>>  This patch attempts to convert the ingenic-dw-hdmi driver
>>>  into a version that uses the component framework.
>> 
>>  Why ? What problem would this solve ?
> 
> Well, it was suggested in a v1 we did post several months ago. I have 
> not
> looked up by whom and do not exactly remember the reasons.
> 
> We now simply thought that it is common style since dome dw-hdmi 
> drivers
> make use of it but some others don't. And we got it working without.
> 
> If it is not needed/requested by anyone, we can drop it from v3 (or 
> add later).

I don't remember exactly TBH - the only reason to use a component is to 
have access to the main driver's "drm_device" structure. The IPU needs 
it for instance, to register planes; but I don't think this HDMI driver 
needs it as it registers a bridge.

Cheers,
-Paul