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 X-Spam-Level: X-Spam-Status: No, score=-7.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id BE276C433E0 for ; Mon, 18 May 2020 08:30:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9A68320674 for ; Mon, 18 May 2020 08:30:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727012AbgERIal (ORCPT ); Mon, 18 May 2020 04:30:41 -0400 Received: from foss.arm.com ([217.140.110.172]:35796 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726997AbgERIal (ORCPT ); Mon, 18 May 2020 04:30:41 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 4CD87106F; Mon, 18 May 2020 01:30:40 -0700 (PDT) Received: from [192.168.2.22] (unknown [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 138073F305; Mon, 18 May 2020 01:30:38 -0700 (PDT) Subject: Re: [PATCH v1 8/9] arm64: dts: actions: Add MMC controller support for S700 To: Manivannan Sadhasivam , Amit Tomer Cc: =?UTF-8?Q?Andreas_F=c3=a4rber?= , Rob Herring , cristian.ciocaltea@gmail.com, linux-arm-kernel , linux-actions@lists.infradead.org, devicetree@vger.kernel.org References: <1589472657-3930-1-git-send-email-amittomer25@gmail.com> <1589472657-3930-9-git-send-email-amittomer25@gmail.com> <2cd3cdaf-826e-9d12-9fd4-9f7e2a517ecd@arm.com> <20200518061755.GA25113@mani> From: =?UTF-8?Q?Andr=c3=a9_Przywara?= Autocrypt: addr=andre.przywara@arm.com; prefer-encrypt=mutual; keydata= xsFNBFNPCKMBEAC+6GVcuP9ri8r+gg2fHZDedOmFRZPtcrMMF2Cx6KrTUT0YEISsqPoJTKld tPfEG0KnRL9CWvftyHseWTnU2Gi7hKNwhRkC0oBL5Er2hhNpoi8x4VcsxQ6bHG5/dA7ctvL6 kYvKAZw4X2Y3GTbAZIOLf+leNPiF9175S8pvqMPi0qu67RWZD5H/uT/TfLpvmmOlRzNiXMBm kGvewkBpL3R2clHquv7pB6KLoY3uvjFhZfEedqSqTwBVu/JVZZO7tvYCJPfyY5JG9+BjPmr+ REe2gS6w/4DJ4D8oMWKoY3r6ZpHx3YS2hWZFUYiCYovPxfj5+bOr78sg3JleEd0OB0yYtzTT esiNlQpCo0oOevwHR+jUiaZevM4xCyt23L2G+euzdRsUZcK/M6qYf41Dy6Afqa+PxgMEiDto ITEH3Dv+zfzwdeqCuNU0VOGrQZs/vrKOUmU/QDlYL7G8OIg5Ekheq4N+Ay+3EYCROXkstQnf YYxRn5F1oeVeqoh1LgGH7YN9H9LeIajwBD8OgiZDVsmb67DdF6EQtklH0ycBcVodG1zTCfqM AavYMfhldNMBg4vaLh0cJ/3ZXZNIyDlV372GmxSJJiidxDm7E1PkgdfCnHk+pD8YeITmSNyb 7qeU08Hqqh4ui8SSeUp7+yie9zBhJB5vVBJoO5D0MikZAODIDwARAQABzS1BbmRyZSBQcnp5 d2FyYSAoQVJNKSA8YW5kcmUucHJ6eXdhcmFAYXJtLmNvbT7CwXsEEwECACUCGwMGCwkIBwMC BhUIAgkKCwQWAgMBAh4BAheABQJTWSV8AhkBAAoJEAL1yD+ydue63REP/1tPqTo/f6StS00g NTUpjgVqxgsPWYWwSLkgkaUZn2z9Edv86BLpqTY8OBQZ19EUwfNehcnvR+Olw+7wxNnatyxo D2FG0paTia1SjxaJ8Nx3e85jy6l7N2AQrTCFCtFN9lp8Pc0LVBpSbjmP+Peh5Mi7gtCBNkpz KShEaJE25a/+rnIrIXzJHrsbC2GwcssAF3bd03iU41J1gMTalB6HCtQUwgqSsbG8MsR/IwHW XruOnVp0GQRJwlw07e9T3PKTLj3LWsAPe0LHm5W1Q+euoCLsZfYwr7phQ19HAxSCu8hzp43u zSw0+sEQsO+9wz2nGDgQCGepCcJR1lygVn2zwRTQKbq7Hjs+IWZ0gN2nDajScuR1RsxTE4WR lj0+Ne6VrAmPiW6QqRhliDO+e82riI75ywSWrJb9TQw0+UkIQ2DlNr0u0TwCUTcQNN6aKnru ouVt3qoRlcD5MuRhLH+ttAcmNITMg7GQ6RQajWrSKuKFrt6iuDbjgO2cnaTrLbNBBKPTG4oF D6kX8Zea0KvVBagBsaC1CDTDQQMxYBPDBSlqYCb/b2x7KHTvTAHUBSsBRL6MKz8wwruDodTM 4E4ToV9URl4aE/msBZ4GLTtEmUHBh4/AYwk6ACYByYKyx5r3PDG0iHnJ8bV0OeyQ9ujfgBBP B2t4oASNnIOeGEEcQ2rjzsFNBFNPCKMBEACm7Xqafb1Dp1nDl06aw/3O9ixWsGMv1Uhfd2B6 it6wh1HDCn9HpekgouR2HLMvdd3Y//GG89irEasjzENZPsK82PS0bvkxxIHRFm0pikF4ljIb 6tca2sxFr/H7CCtWYZjZzPgnOPtnagN0qVVyEM7L5f7KjGb1/o5EDkVR2SVSSjrlmNdTL2Rd zaPqrBoxuR/y/n856deWqS1ZssOpqwKhxT1IVlF6S47CjFJ3+fiHNjkljLfxzDyQXwXCNoZn BKcW9PvAMf6W1DGASoXtsMg4HHzZ5fW+vnjzvWiC4pXrcP7Ivfxx5pB+nGiOfOY+/VSUlW/9 GdzPlOIc1bGyKc6tGREH5lErmeoJZ5k7E9cMJx+xzuDItvnZbf6RuH5fg3QsljQy8jLlr4S6 8YwxlObySJ5K+suPRzZOG2+kq77RJVqAgZXp3Zdvdaov4a5J3H8pxzjj0yZ2JZlndM4X7Msr P5tfxy1WvV4Km6QeFAsjcF5gM+wWl+mf2qrlp3dRwniG1vkLsnQugQ4oNUrx0ahwOSm9p6kM CIiTITo+W7O9KEE9XCb4vV0ejmLlgdDV8ASVUekeTJkmRIBnz0fa4pa1vbtZoi6/LlIdAEEt PY6p3hgkLLtr2GRodOW/Y3vPRd9+rJHq/tLIfwc58ZhQKmRcgrhtlnuTGTmyUqGSiMNfpwAR AQABwsFfBBgBAgAJBQJTTwijAhsMAAoJEAL1yD+ydue64BgP/33QKczgAvSdj9XTC14wZCGE U8ygZwkkyNf021iNMj+o0dpLU48PIhHIMTXlM2aiiZlPWgKVlDRjlYuc9EZqGgbOOuR/pNYA JX9vaqszyE34JzXBL9DBKUuAui8z8GcxRcz49/xtzzP0kH3OQbBIqZWuMRxKEpRptRT0wzBL O31ygf4FRxs68jvPCuZjTGKELIo656/Hmk17cmjoBAJK7JHfqdGkDXk5tneeHCkB411p9WJU vMO2EqsHjobjuFm89hI0pSxlUoiTL0Nuk9Edemjw70W4anGNyaQtBq+qu1RdjUPBvoJec7y/ EXJtoGxq9Y+tmm22xwApSiIOyMwUi9A1iLjQLmngLeUdsHyrEWTbEYHd2sAM2sqKoZRyBDSv ejRvZD6zwkY/9nRqXt02H1quVOP42xlkwOQU6gxm93o/bxd7S5tEA359Sli5gZRaucpNQkwd KLQdCvFdksD270r4jU/rwR2R/Ubi+txfy0dk2wGBjl1xpSf0Lbl/KMR5TQntELfLR4etizLq Xpd2byn96Ivi8C8u9zJruXTueHH8vt7gJ1oax3yKRGU5o2eipCRiKZ0s/T7fvkdq+8beg9ku fDO4SAgJMIl6H5awliCY2zQvLHysS/Wb8QuB09hmhLZ4AifdHyF1J5qeePEhgTA+BaUbiUZf i4aIXCH3Wv6K Organization: ARM Ltd. Message-ID: <29500523-0fe4-955d-57de-d4b9f11cedb8@arm.com> Date: Mon, 18 May 2020 09:29:46 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.7.0 MIME-Version: 1.0 In-Reply-To: <20200518061755.GA25113@mani> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: devicetree-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org On 18/05/2020 07:17, Manivannan Sadhasivam wrote: > On 0518, Amit Tomer wrote: >> Hi, >> >>> I recommend reading the DT spec, chapter 2.3.1 "compatible": >>> https://github.com/devicetree-org/devicetree-specification/releases/download/v0.3/devicetree-specification-v0.3.pdf >> >> My point is more about, DT validation is not happy about this situation. >> For instance when I run dt-validate, do see following: >> >> /home/amit/work/kernel_work/linux/arch/arm64/boot/dts/actions/s700-cubieboard7.dt.yaml: >> mmc@e0210000: compatible: Additional items are not allowed >> ('actions,s700-mmc' was unexpected) >> >> and I am not sure if this is because DT and driver has different >> number of compatible strings. This has nothing to do with the driver or the actual .dts(i), that's purely a binding issue. > Yeah, the DT YAML validation tool doesn't allow this. And there were patches > removing the additional compatible from DTS. There are tons of examples of how this is done in the .yaml bindings: properties: compatible: oneOf: - const: actions,owl-mmc - items: - const: action,s700-mmc - const: actions,owl-mmc Adding more alternatives would replace the lines after items: - enum - action,s700-mmc - action,s900-mmc - const: actions,owl-mmc > I don't know if the DT fallback is discouraged or not. I don't know if there is an "official" statement on this, but last thing I heard, adding SoC specific compatibles to generic fallback strings was encouraged. Hence my proposal, to add one. > Anyway, is enough investigation done to justify that we need SoC specific tweaks > in the driver? I think I did look into the downstream code for s700/s500 while > upstreaming this driver and convinced myself that the same driver could be > reused without modifications. It wouldn't be the first time some tiny incompatibility would be discovered later, also there is always the chance of a hardware errata. So better safe than sorry. Cheers, Andre. 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Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jabAb-0005cd-Qg; Mon, 18 May 2020 08:30:45 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jabAX-0005bz-R5; Mon, 18 May 2020 08:30:43 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 4CD87106F; Mon, 18 May 2020 01:30:40 -0700 (PDT) Received: from [192.168.2.22] (unknown [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 138073F305; Mon, 18 May 2020 01:30:38 -0700 (PDT) Subject: Re: [PATCH v1 8/9] arm64: dts: actions: Add MMC controller support for S700 To: Manivannan Sadhasivam , Amit Tomer References: <1589472657-3930-1-git-send-email-amittomer25@gmail.com> <1589472657-3930-9-git-send-email-amittomer25@gmail.com> <2cd3cdaf-826e-9d12-9fd4-9f7e2a517ecd@arm.com> <20200518061755.GA25113@mani> From: =?UTF-8?Q?Andr=c3=a9_Przywara?= Autocrypt: addr=andre.przywara@arm.com; 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Message-ID: <29500523-0fe4-955d-57de-d4b9f11cedb8@arm.com> Date: Mon, 18 May 2020 09:29:46 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.7.0 MIME-Version: 1.0 In-Reply-To: <20200518061755.GA25113@mani> Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200518_013041_966965_AECB7559 X-CRM114-Status: GOOD ( 16.37 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree@vger.kernel.org, linux-actions@lists.infradead.org, cristian.ciocaltea@gmail.com, Rob Herring , =?UTF-8?Q?Andreas_F=c3=a4rber?= , linux-arm-kernel Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 18/05/2020 07:17, Manivannan Sadhasivam wrote: > On 0518, Amit Tomer wrote: >> Hi, >> >>> I recommend reading the DT spec, chapter 2.3.1 "compatible": >>> https://github.com/devicetree-org/devicetree-specification/releases/download/v0.3/devicetree-specification-v0.3.pdf >> >> My point is more about, DT validation is not happy about this situation. >> For instance when I run dt-validate, do see following: >> >> /home/amit/work/kernel_work/linux/arch/arm64/boot/dts/actions/s700-cubieboard7.dt.yaml: >> mmc@e0210000: compatible: Additional items are not allowed >> ('actions,s700-mmc' was unexpected) >> >> and I am not sure if this is because DT and driver has different >> number of compatible strings. This has nothing to do with the driver or the actual .dts(i), that's purely a binding issue. > Yeah, the DT YAML validation tool doesn't allow this. And there were patches > removing the additional compatible from DTS. There are tons of examples of how this is done in the .yaml bindings: properties: compatible: oneOf: - const: actions,owl-mmc - items: - const: action,s700-mmc - const: actions,owl-mmc Adding more alternatives would replace the lines after items: - enum - action,s700-mmc - action,s900-mmc - const: actions,owl-mmc > I don't know if the DT fallback is discouraged or not. I don't know if there is an "official" statement on this, but last thing I heard, adding SoC specific compatibles to generic fallback strings was encouraged. Hence my proposal, to add one. > Anyway, is enough investigation done to justify that we need SoC specific tweaks > in the driver? I think I did look into the downstream code for s700/s500 while > upstreaming this driver and convinced myself that the same driver could be > reused without modifications. It wouldn't be the first time some tiny incompatibility would be discovered later, also there is always the chance of a hardware errata. So better safe than sorry. Cheers, Andre. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel