From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1794395621; b=z8PkpuUxh9/dhwzxDJh5umNY5E2IZyvUlYx7IPafYpzeOi06BR/vyW2a1E5Xl1r+aXj1 h8jlLphuf5qmhLTMZl9jSmMcH00PkKc1fjD2oumH6IIPFxMecMLo4hu1+WcJqL+Je23g1 bPtra14KcftfcXP9wUYGhVIKZKn+gzgyCE0IcEwTd4tQrwI41gxIDE2PJn3ro4BpQrvyK RN9+wUdZDAovqJInZDsuX7HZO2L1Ipn+ltooyfc7CfKQKMux4LZiX30lxFaiS7DSpSYW8 RmPr06s1JoJGDJsqM9VF0gaeiYPIh7TBvCyb3u0V9sbUWcMbEYRsP8Y0V0Z3ftvlwvQ== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794395621; h=Received:DKIM-Signature:Date:From:To:Cc:Subject:Message-ID: References:MIME-Version:Content-Type:Content-Disposition:In-Reply-To; bh=36EWbltYP1E9t7Yv3ApaDJEPV9SCfDDIWUtGCljX8yg=; b=aPwrSyIp4ktNNJvIMDd4OHiNDpAyTaVYye/ApOx4Zdm673dy3Aga15Y8UScEwerD51Vz QPGOV+nlz64v/+lKD7SVavUM6cEKRz5A9cs48yX4wUAecN25uo0S61wt+Ol7j9vLiXUbi j3G05rzh/e93Lf1vZgmgo/n7eSDkrtrJqLrMGfayJglgeu9MkN5OvwewXjhZHTVgLS0R3 ar9s8AbfidIX5neLAVTnFVCUd5PAvaDLeqWCdqdVFWTh80YEYWOzGNTsPNafptaSr7gU+ CfE+8ttU6wPtkeGRNeCkhRPKoAbi0w+uiQ+V/Iyfpec2hYnnph6cPnsE2BozuHWX6Yg== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=RkSBiodO; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1E992606A31C; Wed, 11 Nov 2026 11:13:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=RkSBiodO Received: by smtp.kernel.org (Postfix) with ESMTPSA id 965981F00A05; Wed, 11 Nov 2026 11:13:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1794395620; bh=36EWbltYP1E9t7Yv3ApaDJEPV9SCfDDIWUtGCljX8yg=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=RkSBiodOgR4Vu3WoOamr63RiGELqBdARbGedG+t/PZFNJ1wURAsulgYkgjo6Hhp7o n46m3vAu39vQNRhG/chrRTaHfHnwG2/oEdt6h9z5OUFKABcyAMWHBg3UGEEp9JGMbV m4YTC24KWs9dYPwJoaQOkj6jvX/8/n8J6Kre+2HCN0Ln2gKIAXcbV3m6tLyyw54KVB 151tpV9b+zxFfBCF1fpDGsymzjpD9DHgICSS9xfP+o6pGmt6s3FXxUqLbBXbgMa5d6 Uz17XUv2nAqGV+8RKeQQ3KgKMzjigERffx3ZJNNVRwaof7iqSbCNhVt26lYw1PMDrV /RAeTCzc1TQVg== Date: Wed, 11 Nov 2026 12:13:37 +0100 From: Maxime Ripard To: Krzysztof Kozlowski 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 Subject: Re: [PATCH] dt-bindings: display: panel: Make DSI panels port optional Message-ID: References: <20261111110338.81717-2-krzysztof.kozlowski@oss.qualcomm.com> 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 Content-Type: multipart/signed; micalg=pgp-sha384; protocol="application/pgp-signature"; boundary="nbzsbrbfjlpcpmzq" Content-Disposition: inline In-Reply-To: <20261111110338.81717-2-krzysztof.kozlowski@oss.qualcomm.com> --nbzsbrbfjlpcpmzq Content-Type: text/plain; protected-headers=v1; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Subject: Re: [PATCH] dt-bindings: display: panel: Make DSI panels port optional MIME-Version: 1.0 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. >=20 > 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. >=20 > 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? Maxime --nbzsbrbfjlpcpmzq Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iJUEABMJAB0WIQTkHFbLp4ejekA/qfgnX84Zoj2+dgUCavRN4AAKCRAnX84Zoj2+ drBoAYCgtYU8iP34m/O3qAL8jHZ6w3VHZjiW2G37PLPh+1PFoVvjBC5GoEu8ff00 +lWRtM4BgMgudwnDPpuPHEgx+ZAkUZcDuzAaKvmq6V8XHDLf+ZJORjMRqukb+pNm /OfusQSCIw== =MTke -----END PGP SIGNATURE----- --nbzsbrbfjlpcpmzq--