From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 95294EEBA; Fri, 6 Mar 2026 07:16:41 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772781401; cv=none; b=cVeiuxB0rsiS09WlwO5X7S8Gg76r2eryLn1krtcnn5ERtU3AQ23XGVwGV0SDyVBw/XfVeOX1kUbhbdpSPWYvoEv27FYOsqsn+BxgOnMurBmggYcPSFUUXC/r2g3aGPfJI4uAvbBKM/brejgdlq9j9LeWUb7MXZOfbhO6EuVRB5c= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772781401; c=relaxed/simple; bh=+CSZ/lxHhezXtn9zq2t5/nDJXac/JaET+DDAkLJYycM=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=P/7NTWDuJGY6Efodfi70O9kROcxgIumsM3IyDYJMcf4AUnODp/72Fw9Xxq6p7l3jxupK2OBl79LobNR12HIth64fefy58h7hE6e/vnzLM/aIswRNuWOUFfY5TbdjFpLFdsaE6GGClA7alXpfx/zd/jDl0ucLWWmy5TJVwPUbseA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Sjbtmlt5; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="Sjbtmlt5" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9D2B6C19422; Fri, 6 Mar 2026 07:16:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1772781401; bh=+CSZ/lxHhezXtn9zq2t5/nDJXac/JaET+DDAkLJYycM=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=Sjbtmlt5YVdHFOSshJZ5HUZpMCqZtEGBKB2AkNyder91svEkNhhdFoKhyqyT80TSr 6OTFazsF+J5SNAsWos1xgowhROzVYR9QWgeT8QvhB5IgFCYArQEfzWi6BPQZwaRfGP 2To+qJgVm/slYjcJv1Vsm6O3DemMy8sauAoCzWoJt3pVHk1h+lXBIqSdyYedL7bxOc H3bPT+3EFocULYjL6D3KT9zyr6UBRzM6mFsZIxo1g5x9SrKvsTRezrEaYiJ2CLgHjZ zo1BKzp6HT6QTfJXzdvEcxC2n3TVytdKUysP6j8Ucs8NmaIvmmjyrRX3J33/oqzbmS o3LeLmyze2cFg== Message-ID: <20d37ab7-308e-4f07-96dc-7ae011af76d0@kernel.org> Date: Fri, 6 Mar 2026 08:16:37 +0100 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/1] ARM: dts: imx6sx: remove fallback compatible string fsl,imx28-lcdif To: Frank Li Cc: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" , "open list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" , "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" , open list , Liu Ying References: <20260305212312.4053922-1-Frank.Li@nxp.com> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 05/03/2026 23:48, Frank Li wrote: > On Thu, Mar 05, 2026 at 10:34:18PM +0100, Krzysztof Kozlowski wrote: >> On 05/03/2026 22:23, Frank Li wrote: >>> i.MX6SX uses the v6 LCDIF controller, while i.MX28 uses the older v4 >>> version. The driver has supported the "fsl,imx6sx-lcdif" compatible string >>> since the initial commit: >>> >>> commit 45d59d704080 ("drm: Add new driver for MXSFB controller") >>> >>> Therefore the fallback compatible string "fsl,imx28-lcdif" is not required >>> and can be removed. >> >> It is required - you are changing the ABI and possibly impacting other >> users without valid reason ("not required and can be removed" is not a >> reason). > > In https://lore.kernel.org/imx/42eb2d42-47b0-46b6-92e9-c59473113c2d@nxp.com/ > > other known user barebox/uboot already fix it. > > https://lore.barebox.org/barebox/20251107210033.2229781-3-a.fatoum@barebox.org/T/#u > https://git.pengutronix.de/cgit/barebox/commit/?id=c99b937f3a31 And you have entire commit msg to explain the ABI impact... Best regards, Krzysztof