linux-kernel - Re: [PATCH v2 1/5] dt-bindings: display: simple-framebuffer: Add interconnects property

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Message-ID: <e2159868-f31d-4d35-b6b1-2cbd1a9d249b@suse.de>
Date: Thu, 3 Jul 2025 08:47:52 +0200
From: Thomas Zimmermann <tzimmermann@...e.de>
To: Krzysztof Kozlowski <krzk@...nel.org>, Hans de Goede
 <hdegoede@...hat.com>, Luca Weiss <luca.weiss@...rphone.com>
Cc: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, 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>, Javier Martinez Canillas <javierm@...hat.com>,
 Helge Deller <deller@....de>, linux-fbdev@...r.kernel.org,
 dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/5] dt-bindings: display: simple-framebuffer: Add
 interconnects property

Hi

Am 02.07.25 um 22:43 schrieb Krzysztof Kozlowski:
> On 30/06/2025 10:40, Hans de Goede wrote:
>>> No one asks to drop them from the driver. I only want specific front
>>> compatible which will list and constrain the properties. It is not
>>> contradictory to your statements, U-boot support, driver support. I
>>> really do not see ANY argument why this cannot follow standard DT rules.
>> So what you are saying is that you want something like:
>>
>> framebuffer0: framebuffer@...85000 {
>> 	compatible = "qcom.simple-framebuffer-sm8650-mdss", "simple-framebuffer";
>> }
>>
>> and that the binding for qcom.simple-framebuffer-sm8650-mdss
>> can then list interconnects ?
> IMO yes (after adjusting above to coding style), but as mentioned in
> other response you can just get an ack or opinion from Rob or Conor.

But does that work with *any* device that requires interconnects? The 
next such simple-framebuffer device should work out of the box *without* 
the kernel knowing anything about it. That's one of the key features of 
the simple-framebuffer.  If we have to maintainer per-device feature 
sets, it breaks that assumption.

Best regards
Thomas

>
> Best regards,
> Krzysztof

-- 
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstrasse 146, 90461 Nuernberg, Germany
GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
HRB 36809 (AG Nuernberg)