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Wed, 11 Nov 2026 04:31:03 -0800 (PST) Received: from [192.168.1.110] ([178.197.218.7]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4ba0951f237sm35965765e9.4.2026.11.11.04.30.58 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 11 Nov 2026 04:31:02 -0800 (PST) Message-ID: Date: Wed, 11 Nov 2026 13:30:56 +0100 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] dt-bindings: display: panel: Make DSI panels port optional To: Maxime Ripard Cc: Neil Armstrong , Jessica Zhang , Maarten Lankhorst , Thomas Zimmermann , David Airlie , Simona Vetter , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Joel Selvaraj , Jagan Teki , Ondrej Jirman , Javier Martinez Canillas , Michael Trimarchi , Michael Tretter , Cristian Cozzolino , Sumit Semwal , Ryan Brue , Nickolay Goppen , Robert Chiras , Alexander Koskovich , Marijn Suijten , Geert Uytterhoeven , Magnus Damm , Chris Morgan , Barnabas Czeman , Heiko Stuebner , Luca Weiss , Arpit Saini , Michael Walle , Ritesh Kumar , Sebastian Reichel , Konrad Dybcio , Svyatoslav Ryhel , Danila Tikhonov , Jens Reidel , Michael Srba , Shawn Guo , Alexandre Mergnat , Alexander Baransky , Abhinav Kumar , dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-renesas-soc@vger.kernel.org, Romain TISSERAND References: <20261111110338.81717-2-krzysztof.kozlowski@oss.qualcomm.com> From: Krzysztof Kozlowski Content-Language: en-US In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Authority-Analysis: v=2.4 cv=GKGdgeNK c=1 sm=1 tr=0 ts=6af46009 cx=c_pps a=P2rfLEam3zuxRRdjJWA2cw==:117 a=uyPgTw0bjBTS2cVxpiNm5w==:17 a=IkcTkHD0fZMA:10 a=zJRp6_cAMcgA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=DJpcGTmdVt4CTyJn9g5Z:22 a=pGLkceISAAAA:8 a=EUspDBNiAAAA:8 a=iRCOULmDqfF0gFl_j5kA:9 a=QEXdDO2ut3YA:10 a=ODZdjJIeia2B_SHc_B0f:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMTExMDA0OSBTYWx0ZWRfX1Q7Xhp11KiC/ r6pClEAYvfZy9fyPy3Rg5QHyHA3wta4HZfuS1iIZBt4l8WBbWrHdptcrbx8qmiMx3KBSzAT05Bg R/IIT1/hC0I3iXqBqo8Z/O3ucLGCdkyTjMAx0vqEmWovGBoBSmoxyG91ELSP0cbQBQ3/UC6f2qp SKU/AadQSmA7F9PjykJUv7f9LxCwKAqZrdswyVXUFpGGtI8D4sv1uLUrlxOjy8UqH3rj4gZfr1J rTVFk7jVCZL+Ygl+ZK6XQeVNhOV+vU7oTrvr3tXifDgYlGCuu8whPlxX88IqVKnTS/mHbmqxh9j idUqacPa1wH5ZTpHJ2r3W3Ahayd2iiSfH7Ui1fEuE8MFZbYTFYEz/1wBKRwGlWjmvq1Id19bFyS 9e4BFxm7vCy6hMEQm6KFDc5jnLetTPLEIp4U1AYIsozvGYrNf2BgmgxYwIoDCpMTQoc7OzwUy7S eAZrBVotPRyvJb68g/w== X-Proofpoint-GUID: VcLMo84FAoTnhT8EhCJRzOXV43REkFO2 X-Proofpoint-ORIG-GUID: VcLMo84FAoTnhT8EhCJRzOXV43REkFO2 X-Proofpoint-Spam-Info: AW1haW4tMjYxMTExMDA0OSBTYWx0ZWRfX4w1ToGJ4P39o uyYUClz3LpjQxU0gsxvh1d/3VcG8LIOkZwxe/gYhn6cHgE4oScyVKwF080Mk1CQvAMrb4JwR7Vt 9QWMfG6A2Ev09u/IrraI6m5fb/gmTH4= X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.138,FMLib:17.12.100.49 definitions=2026-11-11_02,2026-11-11_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 clxscore=1015 lowpriorityscore=0 priorityscore=1501 phishscore=0 spamscore=0 bulkscore=0 suspectscore=0 impostorscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2611040001 definitions=main-2611110049 On 11/11/2026 12:13, Maxime Ripard wrote: > 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* Some drivers use endpoints, some not. As discussed on other thread, there are more than which do not. > >> 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 >> Signed-off-by: Krzysztof Kozlowski > > 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? > We do not drop the port node, who suggested that? You do get, that we are not talking about the DSI host, but the panel? Best regards, Krzysztof