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Tue, 16 Aug 2022 06:31:22 +0000 Received: from DU0PR04MB9417.eurprd04.prod.outlook.com ([fe80::3c6c:b7e6:a93d:d442]) by DU0PR04MB9417.eurprd04.prod.outlook.com ([fe80::3c6c:b7e6:a93d:d442%4]) with mapi id 15.20.5525.011; Tue, 16 Aug 2022 06:31:22 +0000 From: Peng Fan To: Krzysztof Kozlowski , "Peng Fan (OSS)" , Aisheng Dong , "robh+dt@kernel.org" , "krzysztof.kozlowski+dt@linaro.org" , "shawnguo@kernel.org" , "s.hauer@pengutronix.de" CC: "kernel@pengutronix.de" , "festevam@gmail.com" , dl-linux-imx , "linux-i2c@vger.kernel.org" , "devicetree@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , "linux-kernel@vger.kernel.org" , Clark Wang Subject: RE: [PATCH 0/6] i2c-imx-lpi2c: add IPG clock Thread-Topic: [PATCH 0/6] i2c-imx-lpi2c: add IPG clock Thread-Index: AQHYrgSSA2Yxdic4lUaQqa4Ze2PTqa2rDHsAgAQXC0CAAeuegIAAB+IA Date: Tue, 16 Aug 2022 06:31:22 +0000 Message-ID: References: <20220812043424.4078034-1-peng.fan@oss.nxp.com> <039566a7-5c65-b2d8-7b45-c616863cb292@linaro.org> In-Reply-To: <039566a7-5c65-b2d8-7b45-c616863cb292@linaro.org> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=nxp.com; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org > Subject: Re: [PATCH 0/6] i2c-imx-lpi2c: add IPG clock > > On 15/08/2022 03:52, Peng Fan wrote: > > Hi Krzysztof, > > > >> Subject: Re: [PATCH 0/6] i2c-imx-lpi2c: add IPG clock > >> > >> On 12/08/2022 07:34, Peng Fan (OSS) wrote: > >>> From: Peng Fan > >>> > >>> The i.MX LPI2C needs PER and IPG clock, not just PER or IPG clock. > >>> This patch is to enable both PER and IPG clock for imx-i2c-lpi2c. > >> > >> This patchset breaks the ABI and is not bisectable. The justification > >> is very limited (one sentence), so not really enough. > > > > ARM32 i.MX7ULP and ARM64 i.MX8QXP/i.MX8ULP all need to use two > clocks, > > PER and IPG. But current dt-bindings and dts, use one clock. > > > > This patchset includes dts changes patch 4 and patch 5. > > Patch 6 is to update driver use two clocks. > > > > I think the patch order in this patchset would not break git bisect, > > it just break ABI. But I not find good way how could not break ABI, > > because only use one clock is wrong whether in dt-bindings or dtbs. > > Driver changes always go via separate branch than DTS, so your patch > breaks git bisect. I already pointed it out in other patch. This is not really > acceptable. Breaking ABI is another problem which could be justified with > your explanation in other cases... but not in this one, since it is easy to make > it backwards compatible, I see. But the current binding and dts using one clk is really wrong. Anyway, I could make it backwards compatible. Thanks, Peng. > > > Should I use a fixes tag to dt-bindings, then break ABI is allowed? > > No. For such patch ABI break is also not allowed in that case. Just make the > driver backwards compatible and both problems - non bisectability and ABI > break - go away. > > Best regards, > Krzysztof _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 64FC7C2BB41 for ; Tue, 16 Aug 2022 08:11:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229589AbiHPILp (ORCPT ); Tue, 16 Aug 2022 04:11:45 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52224 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232644AbiHPIKt (ORCPT ); Tue, 16 Aug 2022 04:10:49 -0400 Received: from EUR05-DB8-obe.outbound.protection.outlook.com (mail-db8eur05on2046.outbound.protection.outlook.com [40.107.20.46]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B594F53007; 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