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=-0.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS autolearn=no 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 17D16C432C0 for ; Wed, 20 Nov 2019 16:38:54 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id D850920679 for ; Wed, 20 Nov 2019 16:38:53 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="iM5S3RxV"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=akkea.ca header.i=@akkea.ca header.b="lj/jZgQO"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=akkea.ca header.i=@akkea.ca header.b="tqbElT9Z" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D850920679 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=akkea.ca Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender:Content-Type: Content-Transfer-Encoding:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:Message-ID:References:In-Reply-To:Subject:To:From: Date:MIME-Version:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=p0jGQskHbXzeckJQQ5sKZ+vvK2nNs2ZTvU3Ns8S37ZU=; b=iM5S3RxVD6JnHIGUi7Cv/pwo/ qfvVq/wChqpMdEYKzYuAK87S/ZY3nMVCQ9SH/MzMm27DjiPWtKo3D3eMjRO476mthbh+G0ihmISTB fwO7vEzm6jf/euaZaGPQeQR8W+s2xMV5mWbkVBmMmSFg80tDopSTLAxnCzN6illLP4sRAYW/wa4B8 +p8Qt6Z6SLjIR1C9xGvRW4JSOh78aEawWtVA+0xRRXkACtZtVzqDmv+6tJ7MCMgiDoG+q48vxebcj 0jilc27qXs3crtkYU4pJhjJr2UHcCUpjevhDxkU6ibmMEn9tHrsmxuAiJWziprRv1w7yfRE5PycqV ETT0ePhaA==; 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 1iXT0H-0008NU-AA; Wed, 20 Nov 2019 16:38:53 +0000 Received: from node.akkea.ca ([192.155.83.177]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1iXT0E-0008Mz-1H for linux-arm-kernel@lists.infradead.org; Wed, 20 Nov 2019 16:38:51 +0000 Received: from localhost (localhost [127.0.0.1]) by node.akkea.ca (Postfix) with ESMTP id 03FA34E2006; Wed, 20 Nov 2019 16:38:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=akkea.ca; s=mail; t=1574267929; bh=yczOZvIA0pLja/5G0e638pMmagqLwd3PNzd2MZu2vOU=; h=Date:From:To:Cc:Subject:In-Reply-To:References; b=lj/jZgQOfWzo9rVMjutg1sXICkp8Vk+49zefmARb4JwXgRKj9s5c6+gchibOiHVPG hDUmJj7Dr0KagVFA3OWk5o6jj3NEqqumnSzXnkGzPwjYpudUCZOvf7BlwDkwX7X7ld GHbVRZYi+SPyduIMwtZG8YVI/XdIdE3vVLZHtwMI= X-Virus-Scanned: Debian amavisd-new at mail.akkea.ca Received: from node.akkea.ca ([127.0.0.1]) by localhost (mail.akkea.ca [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Iv-fRhyZHsij; Wed, 20 Nov 2019 16:38:48 +0000 (UTC) Received: from www.akkea.ca (node.akkea.ca [192.155.83.177]) by node.akkea.ca (Postfix) with ESMTPSA id E6FDA4E2003; Wed, 20 Nov 2019 16:38:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=akkea.ca; s=mail; t=1574267928; bh=yczOZvIA0pLja/5G0e638pMmagqLwd3PNzd2MZu2vOU=; h=Date:From:To:Cc:Subject:In-Reply-To:References; b=tqbElT9ZO2tAyJD7l5bEkeiJteKz2XWL4JyNFyLBz88DyiD0eVQXerb8ql0O48ffK xgojrMoXhpEhRz/OHGmIuaytixs1dmK3j24oeZC3DJ+klFXGUfbAicDEHn49eVfL4O 21kp12ypXZVGw+Aso2Y3V/SWfFPZb5lTz41hGhcs= MIME-Version: 1.0 Date: Wed, 20 Nov 2019 08:38:47 -0800 From: Angus Ainslie To: Leonard Crestez Subject: Re: [PATCH RFC v6 2/9] PM / devfreq: Add generic imx bus scaling driver In-Reply-To: References: <008f2fa973b23fc716d678c5bd35af54@akkea.ca> Message-ID: X-Sender: angus@akkea.ca User-Agent: Roundcube Webmail/1.3.6 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191120_083850_125325_4BFD09F3 X-CRM114-Status: GOOD ( 13.20 ) 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: Mark Rutland , =?UTF-8?Q?Artur_=C5=9Awigo=C5=84?= , Jacky Bai , "Rafael J. Wysocki" , Viresh Kumar , Michael Turquette , Marco Felsch , linux-pm-owner@vger.kernel.org, Alexandre Bailon , Matthias Kaehlcke , Abel Vesa , Anson Huang , Krzysztof Kozlowski , Chanwoo Choi , MyungJoo Ham , dl-linux-imx , devicetree@vger.kernel.org, linux-pm@vger.kernel.org, Rob Herring , Martin Kepplinger , Silvano Di Ninno , linux-arm-kernel@lists.infradead.org, Aisheng Dong , Saravana Kannan , Stephen Boyd , Kyungmin Park , kernel@pengutronix.de, Fabio Estevam , Shawn Guo , Georgi Djakov Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 2019-11-20 08:30, Leonard Crestez wrote: > On 20.11.2019 17:41, Angus Ainslie wrote: >> Hi Leonard, >> >> On 2019-11-20 07:04, Leonard Crestez wrote: >>> On 20.11.2019 16:08, Angus Ainslie wrote: >>> Is "mainline ATF" an important criteria for Purism? >> >> Yes we intend to bring all of our patches to mainline and were hoping >> that NXP would be doing the same. Shouldn't a mainline kernel run on a >> mainline ATF ? > > You can still use mainline ATF (tested right now) but the imx8m-ddrc > driver won't probe. > Sorry I was talking about the DDR frequency scaling specifically. > The ability to mix and match different branches of firmware and kernel > is very useful for testing. There might be slight incompatibilities but > in theory if a feature depends on both firmware and kernel support then > it should gracefully degrade rather than crash or hang. I saw the check you put in for the correct ATF version and that's very helpful thanks. > > ATF support for this feature will be mainlined eventually, I picked the > linux side first because review is more challenging and changes are > much > larger relative to what we have in our internal tree. > Do you have a patch against mainline ATF that we can test this feature with ? Thanks Angus > -- > Regards, > Leonard _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel