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 8D98B25A648; Tue, 25 Feb 2025 07:54:26 +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=1740470066; cv=none; b=LJajWhcw4Gle3p0goncPkkuAdnpNunv/TUApXes0m5nXZVxOz2yveyW9DLyXZthUnoJaAqa168yI4bjyKTPlcYsqpqODuv73mQGCtupQaLICKrm6bGz8dPxtt+mNbFos1LGmqtlmvZdIZh6so6aX8/ex3Fo5z/Rn7fqDKtzMdUY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1740470066; c=relaxed/simple; bh=NGk1qE7yXYQeTLoTmP1HbZudPoB9xCFk42t5aOZVRhM=; h=Message-ID:Date:MIME-Version:Subject:To:References:From: In-Reply-To:Content-Type; b=U+BvZeVQjHzE2/MUlb6Ly2LLVd3OYQW5mFFEETMLQfY1JHk2oSGneuWL8sFJX9y6DyQiUTJ1UOGKm31mf4szYJOVtYpoH+Wia5dwvME1Tg8OfZFV8LJHztmqfQpjVRnuWou82GrAaJphue4DkXFk8VI8QaclZIBCEXlee+ZvwJ0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=CRYofVAH; 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="CRYofVAH" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E12E1C4CEE2; Tue, 25 Feb 2025 07:54:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1740470066; bh=NGk1qE7yXYQeTLoTmP1HbZudPoB9xCFk42t5aOZVRhM=; h=Date:Subject:To:References:From:In-Reply-To:From; b=CRYofVAHxDFI6ppXko1J4AAfQLmKIj84eSLvfQOyLz6X4scFN+BepQpZtrjFcfCcV AFdPdeXvyeq30G6UqfHvVBuc5/gV5Iw8fb2697xvsLhnwXQeipusx5HTyLvPxaGREd MZ8krS8Ba/v8TRhoRR2QSCuyKz0OjYXS3nN1Hlp6bb4MD0sum8F0EyG2gGdvDk0wgk Ayzg4NBgvJ0j40BA03jTe2eIrgJfSj61mF/7soowqQYcNOk2jB8JrwF3NRTUChyCk1 X4302vrmBPT/JEk9OkamR12eI8E10SkpKOkDgw350XVUHAkVCEAWOEX0zb3Okp8Arg jz0Z6EMW+0iRQ== Message-ID: <2b64a9d7-7048-4842-9cc1-fe23f5abdd00@kernel.org> Date: Tue, 25 Feb 2025 08:54:21 +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 v9 1/3] dt-binding: clock: ast2700: modify soc0/1 clock define To: Ryan Chen , Michael Turquette , Stephen Boyd , Philipp Zabel , Joel Stanley , Andrew Jeffery , Rob Herring , Krzysztof Kozlowski , Conor Dooley , "linux-clk@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , "linux-aspeed@lists.ozlabs.org" , "devicetree@vger.kernel.org" , "linux-kernel@vger.kernel.org" References: <20250224095506.2047064-1-ryan_chen@aspeedtech.com> <20250224095506.2047064-2-ryan_chen@aspeedtech.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 25/02/2025 01:41, Ryan Chen wrote: >> Subject: Re: [PATCH v9 1/3] dt-binding: clock: ast2700: modify soc0/1 clock >> define >> >> On 24/02/2025 10:55, Ryan Chen wrote: >>> -remove redundant SOC0_CLK_UART_DIV13: >>> SOC0_CLK_UART_DIV13 is not use at clk-ast2700.c, the clock source tree >>> is uart clk src -> uart_div_table -> uart clk. >>> >>> -Change SOC0_CLK_HPLL_DIV_AHB to SOC0_CLK_AHBMUX: >>> modify clock tree implement. >>> older CLK_AHB use mpll_div_ahb/hpll_div_ahb to be ahb clock source. >>> mpll->mpll_div_ahb >>> -> clk_ahb >>> hpll->hpll_div_ahb >> >> >> I can barely understand it and from the pieces I got, it does not explain need >> for ABI break. >> > > #1. SCU0_CLK_UART_DIV13 is redundant, it does not impact ABI break You did not explain how it does not impact. Clock was exported, there was a user and now there is no clock. User stops working. ABI break. > #2. Change SOC0_CLK_HPLL_DIV_AHB to SOC0_CLK_AHBMUX > Older implement where `mpll_div_ahb` and `hpll_div_ahb` were **hardcoded dividers** for AHB. > In **the new approach (v8)**, I refactored the clock tree to clock tree. I still cannot parse sentences like "refactoring A to A". It's meaningless to me. > It should be ABI-safe change No, you do not understand the ABI. You removed a clock ID, that's the ABI change. Otherwise explain how this is not changing ABI. > > Or you want to keep original SOC0_CLK_HPLL_DIV_AHB define and then add SOC0_CLK_AHBMUX. > To be 1st patch, then 2n patch remove redundant SOC0_CLK_HPLL_DIV_AHB? If you break the ABI you need to clearly explain why. We have long conversations and you still did not say why. Best regards, Krzysztof