From: Ryan Brue <ryanbrue.dev@gmail.com>
To: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>,
Neil Armstrong <neil.armstrong@linaro.org>,
Jessica Zhang <jesszhan0024@gmail.com>,
Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
Maxime Ripard <mripard@kernel.org>,
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>,
Javier Martinez Canillas <javierm@redhat.com>,
Michael Trimarchi <michael@amarulasolutions.com>,
Michael Tretter <m.tretter@pengutronix.de>,
Cristian Cozzolino <cristian_ci@protonmail.com>,
Sumit Semwal <sumit.semwal@linaro.org>,
Nickolay Goppen <setotau@mainlining.org>,
Robert Chiras <robert.chiras@nxp.com>,
Alexander Koskovich <akoskovich@pm.me>,
Marijn Suijten <marijn.suijten@somainline.org>,
Geert Uytterhoeven <geert+renesas@glider.be>,
Magnus Damm <magnus.damm@gmail.com>,
Chris Morgan <macromorgan@hotmail.com>,
Barnabas Czeman <barnabas.czeman@mainlining.org>,
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Arpit Saini <arpit.saini@oss.qualcomm.com>,
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Ritesh Kumar <quic_riteshk@quicinc.com>,
Sebastian Reichel <sebastian.reichel@collabora.com>,
Konrad Dybcio <konradybcio@kernel.org>,
Svyatoslav Ryhel <clamor95@gmail.com>,
Danila Tikhonov <danila@mainlining.org>,
Jens Reidel <adrian@travitia.xyz>,
Michael Srba <Michael.Srba@seznam.cz>,
Shawn Guo <shawn.guo@linaro.org>,
Alexandre Mergnat <amergnat@baylibre.com>,
Alexander Baransky <sanyapilot496@gmail.com>,
Abhinav Kumar <quic_abhinavk@quicinc.com>,
dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-renesas-soc@vger.kernel.org
Cc: Romain TISSERAND <romain.tisserand@gmail.com>
Subject: Re: [PATCH v3] dt-bindings: display: panel: Make DSI panels port optional
Date: Fri, 13 Nov 2026 10:14:10 -0600 [thread overview]
Message-ID: <36b0b778-a5bb-4b85-b36d-d4408c3ca6fa@gmail.com> (raw)
In-Reply-To: <20261113084236.53336-2-krzysztof.kozlowski@oss.qualcomm.com>
On 11/13/26 2:42 AM, Krzysztof Kozlowski wrote:
> DSI panels can be placed under DSI bus directly and some of the Linux DRM
> drivers will work fine with it: mipi_dsi_host_register() adds device for
> such panel and DRM driver does not use OF graph to configure lanes.
> Examples are Samsung Exynos and Allwinner DRM drivers.
>
> The Linux panel drivers affected here do not use OF graph, either.
>
> Requiring graph port for such panels is tying the binding to one
> specific implementation of Linux DRM drivers, e.g. Qualcomm DRM which
> requires the port. That's a mistake, because:
> 1. It prevents usage of such panel in DTS for other platforms,
> 2. Places the constraint (port requirement) in wrong domain - the DSI
> host needs the port, not the panel.
>
> The port is not needed for the panel hardware to operate thus it should
> be optional.
>
> Suggested-by: Romain TISSERAND <romain.tisserand@gmail.com>
> Reviewed-by: Svyatoslav Ryhel <clamor95@gmail.com> # renesas r61307 and r69328
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Acked-by: Ryan Brue <ryanbrue.dev@gmail.com> # novatek,nt51021
Thanks,
Ryan Brue
prev parent reply other threads:[~2026-11-13 16:14 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-11-13 8:42 Krzysztof Kozlowski
2026-11-13 16:14 ` Ryan Brue [this message]
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