From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 45C80FD5F8C for ; Wed, 8 Apr 2026 07:33:04 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 9D0AD10E560; Wed, 8 Apr 2026 07:33:03 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.b="pqguV0zo"; dkim-atps=neutral Received: from tor.source.kernel.org (tor.source.kernel.org [172.105.4.254]) by gabe.freedesktop.org (Postfix) with ESMTPS id 52CFB10E560 for ; Wed, 8 Apr 2026 07:33:02 +0000 (UTC) Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id 4DA626012B; Wed, 8 Apr 2026 07:33:01 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id A411BC19424; Wed, 8 Apr 2026 07:32:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1775633581; bh=WP1pHm7vHywIyVBvdCGz4OQ3PphTtub9xTIn4GnnK2E=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=pqguV0zobk3AlhcKr4UokHRdahn9rreWXR0tr24lnaNRATahidHWdbhqOM9xoskQ8 ENtOG+hBM34mKdGHWUkGp0kEcqdylpwmGh72N8gCVLLapY01WEREV5UZdDK+CLldVr nkasEWjoUr0igyd9f7fi923W09rHdjWuoIdLrIJL+xAiGxYyWxTZ41ak9IuGX/QQOp 83Aco7x+inmO/vAAJTU5WPTfdeRSkgZ5/7ksZo4UiMc9h9Fo0XJGvi4KND1Q6G1Ulw DR8G140rhNU3on+/Zj9p5wvKG8rdOKD4e93IVHEL71peUGynOBKv7KtK0acrNuvwdT Rn8CuKxKLP0nQ== Message-ID: <277cdf3b-7032-4847-9c22-bddae2a76b34@kernel.org> Date: Wed, 8 Apr 2026 09:32:54 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v21 3/8] dt-bindings: display: bridge: Add Cadence MHDP8501 To: Laurentiu Palcu Cc: imx@lists.linux.dev, Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Rob Herring , Krzysztof Kozlowski , Conor Dooley , dri-devel@lists.freedesktop.org, Alexander Stein , Dmitry Baryshkov , Ying Liu , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org References: <20260407-dcss-hdmi-upstreaming-v21-0-4681070ab82f@oss.nxp.com> <20260407-dcss-hdmi-upstreaming-v21-3-4681070ab82f@oss.nxp.com> <20260408-large-marigold-pheasant-bef65f@quoll> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" On 08/04/2026 09:13, Laurentiu Palcu wrote: >>> + phys: >>> + maxItems: 1 >>> + description: >>> + phandle to the DP/HDMI PHY >>> + >>> + interrupts: >>> + items: >>> + - description: Hotplug cable plugin. >>> + - description: Hotplug cable plugout. >>> + >>> + interrupt-names: >>> + items: >>> + - const: plug_in >>> + - const: plug_out >>> + >>> + cdns,bridge-type: >> >> Drop property. Graph defines what is connected on the other side. And if >> this is for different devices then compatible tells what bridge is that. > > Initially, Sandor did use the remote compatible to decide the bridge > type but he assumed the remote is always the connector. However, as > Dmitry pointed out [1], this is not reliable as we can have another bridge > in-between this one and the connector. > > [1] https://lore.kernel.org/all/dpj333mzr5azqhrgw3cxd7x5kiwxms4iomwy74uqfhr2zu4ocr@36rkth27d2jc/ So you still know what is on the other side, e.g. second bridge for HDMI or DP, even if this is DP over USB-C. I understand that Dmitry did not want to use that part of code in the drivers, but what is located at the end is not really a separate property of this bridge, because it already duplicates that information. The final endpoint defines the type. Best regards, Krzysztof