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smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=ZeAi18VV; 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 8FCE0606A89A; Wed, 11 Nov 2026 10:28:15 +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=ZeAi18VV Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4C5CC1F00A05; Wed, 11 Nov 2026 10:28:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1794392895; bh=pffzYjLc24zLkwM750JTE8R2tBDNVqjTU9V9Vefp1ME=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=ZeAi18VVLJ89QheHEsiQjTnP8iCg6V2rf6LvWg5a0h7xltizH6zWe5sg86ldUby96 dIA+Ygwf4Ik4Uj9AGqGdIivaJ4KZeaFIZ6XOt48WTXojFL6vkpJMCJExDlp/IoAMpK E6V0u9tUsJGDBJWo4xyZvsXHb3SZ2wXLE9DyxW10QTozVGGsIKFk/kzmoU/5k0dEHo nnV7kUpe9qLry6Wo1759xeBLlT86qbm2X+nOBHXp6XFRLJrqCa1K7grlJeughGRBic YVReqvSAOf4ENAQRqy3fRFh3C0e8um2R/Md4BjL5NTpJii+DJVUFb3I+v/6cC5iOkL ZforpNeZjRvPA== Message-ID: <5398114b-538c-4e7a-9b36-35029f301630@kernel.org> Date: Wed, 11 Nov 2026 11:28:06 +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 v2 1/3] dt-bindings: display: panel: ilitek, ili9488: make the port optional To: Icenowy Zheng , Romain TISSERAND Cc: Igor Reznichenko , Neil Armstrong , Jessica Zhang , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Rob Herring , Krzysztof Kozlowski , Conor Dooley , dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, sashiko-reviews@lists.linux.dev References: <20261109160706.2272332-1-romain.tisserand@gmail.com> <20261109160706.2272332-2-romain.tisserand@gmail.com> <20261110-comical-adder-from-saturn-8c8fbb@quoll> <68b5a51d767248a71c050110d5faf6c50c964d50.camel@icenowy.me> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 8bit On 11/11/2026 11:26, Icenowy Zheng wrote: > 在 2026-11-10二的 13:00 +0100，Krzysztof Kozlowski写道： >> On Mon, Nov 09, 2026 at 05:07:04PM +0100, Romain TISSERAND wrote: >>> The panel is a MIPI-DSI peripheral, a child node of its DSI host, >>> and the >>> driver does not use a graph port. A port is only needed when the >>> host >>> links its panel through the graph; other DSI hosts, such as the >>> Allwinner >>> sun6i-a31-mipi-dsi one, link the child node and have no output port >>> to >>> point at. The PinePhone panel is described that way on the same >>> host, >>> without a port. >>> >>> Keep the port allowed (panel-common) but no longer required, as for >>> other >>> DSI panels such as ilitek,ili9881c. >> >> ilitek,ili7807s and a few others have the same and it is confusing. >> The >> port should be required when this is connected over SPI or I2C, but >> not >> for MIPI DSI. I think that for MIPI DSI port is meaningless so >> actually >> incorrect. > > I found that the dw-mipi-dsi common code (e.g. on Rockchip SoCs with > dw_mipi_dsi-rockchip) would expect the panel to be connected via a port > even if it's the child node of the DSI controller. > > Such an example is at arch/arm64/boot/dts/rockchip/rk3399-pinephone- > pro.dts . > Yes, the same for Qualcomm. So I actually wonder who needs the change here. Best regards, Krzysztof