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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=Ljepd4rt; 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 33C40606A321; Tue, 10 Nov 2026 12:49:05 +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=Ljepd4rt Received: by smtp.kernel.org (Postfix) with ESMTPSA id 45B7C1F0089F; Tue, 10 Nov 2026 12:48:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1794314945; bh=zHXJPTkKerzfVJJNUx8F5qgPDu406iPyqd9JEKnwCR8=; h=Date:Subject:From:To:Cc:References:In-Reply-To; b=Ljepd4rto1iEmd+Tcv7jE9zOVDTxqkpn0TOaeAIdWl8+Z+DP+jwrsgRXPqYQYF4qv SFgTk6OwyIpolXoq1MLgNE0r4X93ZxEn9zCEvPn+Hawwsbiqy10OeoVgqM97qLHdQW 6dL0WnTVZAriiZhGLrPrPZBqb3w8vglv1sOiA6RRpehwliZVOBWXl7HPkEs6bL/MiH him3PIskGnGVVjUAXONOTx6NGQSUHVeqMfj+31ChQwO7ltqvXyn1lc4E1ZCIkt/neN z2bYRw1QMmZuk3L1hZHWaZuUvIIYvIu/RMkBY7dxVdzDfTivDj2//YWe93OxX/qC8B cumb5sZPsZQ+g== Message-ID: Date: Tue, 10 Nov 2026 13:48:56 +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 v2 1/3] dt-bindings: display: panel: ilitek,ili9488: make the port optional From: Krzysztof Kozlowski To: 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> Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 10/11/2026 13:00, Krzysztof Kozlowski wrote: > 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. > > Why was it added in the first place? > However won't all DRM drivers actually require panel? see b089c0a9b14c and 169466d4e59c which removed fallback to the child node. Best regards, Krzysztof