From: Maxime Ripard <mripard@kernel.org>
To: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Cc: 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>,
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>,
Ryan Brue <ryanbrue.dev@gmail.com>,
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>,
Heiko Stuebner <heiko@sntech.de>,
Luca Weiss <luca.weiss@fairphone.com>,
Arpit Saini <arpit.saini@oss.qualcomm.com>,
Michael Walle <mwalle@kernel.org>,
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,
Romain TISSERAND <romain.tisserand@gmail.com>
Subject: Re: [PATCH] dt-bindings: display: panel: Make DSI panels port optional
Date: Wed, 11 Nov 2026 12:13:37 +0100 [thread overview]
Message-ID: <avRM_GhtR8vMdTO4@houat> (raw)
In-Reply-To: <20261111110338.81717-2-krzysztof.kozlowski@oss.qualcomm.com>
[-- Attachment #1: Type: text/plain, Size: 1117 bytes --]
On Wed, Nov 11, 2026 at 12:03:39PM +0100, Krzysztof Kozlowski wrote:
> DSI panels can be placed under DSI bus directly and many 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.
That's not true. We do use the endpoints to configure the lanes through
the data-lanes property. See drm_of_get_data_lanes*
> The affected here Linux panel drivers 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. The port is not needed for the hardware to operate
> and for some of the Linux drivers, so it should be optional.
>
> Suggested-by: Romain TISSERAND <romain.tisserand@gmail.com>
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
DSI busses can handle multiple devices, and multiple data types. If we
were to drop the port node, how does the upstream video device know
which device it should send its video output to?
Maxime
[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 273 bytes --]
next prev parent reply other threads:[~2026-11-11 11:13 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-11-11 11:03 Krzysztof Kozlowski
2026-11-11 11:13 ` Maxime Ripard [this message]
2026-11-11 11:18 ` Svyatoslav Ryhel
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=avRM_GhtR8vMdTO4@houat \
--to=mripard@kernel.org \
--cc=Michael.Srba@seznam.cz \
--cc=adrian@travitia.xyz \
--cc=airlied@gmail.com \
--cc=akoskovich@pm.me \
--cc=amergnat@baylibre.com \
--cc=arpit.saini@oss.qualcomm.com \
--cc=barnabas.czeman@mainlining.org \
--cc=clamor95@gmail.com \
--cc=conor+dt@kernel.org \
--cc=cristian_ci@protonmail.com \
--cc=danila@mainlining.org \
--cc=devicetree@vger.kernel.org \
--cc=dri-devel@lists.freedesktop.org \
--cc=geert+renesas@glider.be \
--cc=heiko@sntech.de \
--cc=jagan@amarulasolutions.com \
--cc=javierm@redhat.com \
--cc=jesszhan0024@gmail.com \
--cc=jo@jsfamily.in \
--cc=konradybcio@kernel.org \
--cc=krzk+dt@kernel.org \
--cc=krzysztof.kozlowski@oss.qualcomm.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-renesas-soc@vger.kernel.org \
--cc=luca.weiss@fairphone.com \
--cc=m.tretter@pengutronix.de \
--cc=maarten.lankhorst@linux.intel.com \
--cc=macromorgan@hotmail.com \
--cc=magnus.damm@gmail.com \
--cc=marijn.suijten@somainline.org \
--cc=megi@xff.cz \
--cc=michael@amarulasolutions.com \
--cc=mwalle@kernel.org \
--cc=neil.armstrong@linaro.org \
--cc=quic_abhinavk@quicinc.com \
--cc=quic_riteshk@quicinc.com \
--cc=robert.chiras@nxp.com \
--cc=robh@kernel.org \
--cc=romain.tisserand@gmail.com \
--cc=ryanbrue.dev@gmail.com \
--cc=sanyapilot496@gmail.com \
--cc=sebastian.reichel@collabora.com \
--cc=setotau@mainlining.org \
--cc=shawn.guo@linaro.org \
--cc=simona@ffwll.ch \
--cc=sumit.semwal@linaro.org \
--cc=tzimmermann@suse.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®