From: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
To: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Cc: Maxime Ripard <mripard@kernel.org>,
Neil Armstrong <neil.armstrong@linaro.org>,
Jessica Zhang <jesszhan0024@gmail.com>,
Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
Thomas Zimmermann <tzimmermann@suse.de>,
David Airlie <airlied@gmail.com>, Simona Vetter <simona@ffwll.ch>,
Rob Herring <robh@kernel.org>,
Krzysztof Kozlowski <krzk+dt@kernel.org>,
Conor Dooley <conor+dt@kernel.org>,
Joel Selvaraj <jo@jsfamily.in>,
Jagan Teki <jagan@amarulasolutions.com>,
Ondrej Jirman <megi@xff.cz>,
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dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-renesas-soc@vger.kernel.org,
Romain TISSERAND <romain.tisserand@gmail.com>
Subject: Re: [PATCH] dt-bindings: display: panel: Make DSI panels port optional
Date: Wed, 11 Nov 2026 19:05:48 +0100 [thread overview]
Message-ID: <72bc9dbf-a4d3-45e8-8647-a8c4a41045d1@oss.qualcomm.com> (raw)
In-Reply-To: <dki5db5xizrwwijmjbnbx7irg6if24l7punctr2wx35j4toi5c@4rip7azwzt2k>
On 11/11/2026 18:55, Dmitry Baryshkov wrote:
> On Wed, Nov 11, 2026 at 02:54:54PM +0100, Krzysztof Kozlowski wrote:
>>
>> Commit msg said:
>> "many Linux DRM drivers will work fine with it"
>>
>> So many->some? Is this the only problem? What else is not described in
>> commit msg?
>
> The commit message points out that a minority of drivers use and require
> the port, while majority of the drivers don't. I think up to now only
Ack
> the Exynos and sunXi were mentioned. From my point of view, it would be
> better to change corresponding DSI host bindings to allow port bindings
> and then define the OF graph connecting DSI host to DSI panel (which
> might be done gradually, etc.) even if the OF graph is not used nowadays
> by those drivers instead of providing a false signal that it's okay to
> have DSI links without OF graph connection. It's not future-proof and
> not okay, especially for the new designs.
Around 33% of DSI panels bindings do not require port, so to fulfill
above their bindings should be changed and ABI broken by requiring now a
panel.
Even though neither the panel hardware nor the panel driver needs the port.
The requirement of the port is on DSI host drivers, thus it should be
required there, just like I did for MSM bindings today.
Best regards,
Krzysztof
next prev parent reply other threads:[~2026-11-11 18:05 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-11-11 11:03 Krzysztof Kozlowski
2026-11-11 11:13 ` Maxime Ripard
2026-11-11 12:30 ` Krzysztof Kozlowski
2026-11-11 12:31 ` Krzysztof Kozlowski
2026-11-11 12:37 ` Dmitry Baryshkov
2026-11-11 12:44 ` Krzysztof Kozlowski
2026-11-11 13:52 ` Maxime Ripard
2026-11-11 13:54 ` Krzysztof Kozlowski
2026-11-11 17:55 ` Dmitry Baryshkov
2026-11-11 18:05 ` Krzysztof Kozlowski [this message]
2026-11-11 15:55 ` Icenowy Zheng
2026-11-11 11:18 ` Svyatoslav Ryhel
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