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=-2.4 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 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 5FE97C3524B for ; Tue, 4 Feb 2020 09:45:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2BEEA2166E for ; Tue, 4 Feb 2020 09:45:36 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=posteo.de header.i=@posteo.de header.b="Yr0XJGE8" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726151AbgBDJpf (ORCPT ); Tue, 4 Feb 2020 04:45:35 -0500 Received: from mout01.posteo.de ([185.67.36.65]:58152 "EHLO mout01.posteo.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726343AbgBDJpf (ORCPT ); Tue, 4 Feb 2020 04:45:35 -0500 Received: from submission (posteo.de [89.146.220.130]) by mout01.posteo.de (Postfix) with ESMTPS id E3A07160061 for ; Tue, 4 Feb 2020 10:45:30 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=posteo.de; s=2017; t=1580809531; bh=ntRVVZfu2Cc3qCleVD+LFgHBHaO+67gzE+7IWaAp6gc=; h=Subject:To:Cc:From:Autocrypt:Date:From; b=Yr0XJGE8LzPFAryJB7LDU03Ivmfk989gVGp7sYi2dePalHzoh8BPtimD6Heu+jh3M hCzClW4PnRps6txs9mO2DFnUNzhopa05V+7HmMptRGDelTc+CHD8tzuWBf1ZeHWDUq HMbDCU2sQPeW1jc4GCSkHvd7S2uAVNYA4kimC5stdtUEUoAGDsfqOHZRSJ0a2s4GaL fxUsxrQdvaYMmcjpfOn/FU109jwV0+NPB4GiNVSMHL3g+RgAPl/86zs+dvyD3ddtTQ dbYOmz/4Sb5SnzyR7TFCp1VRiAwjcd5MmfUg9TLoDrdBzhLJaa5huwBF8W+lfk4UTA dvoQmuKx3zhLQ== Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 48Bfv371HSz6tmN; Tue, 4 Feb 2020 10:45:19 +0100 (CET) Subject: Re: [PATCH RFC v6 2/9] PM / devfreq: Add generic imx bus scaling driver To: Leonard Crestez , Angus Ainslie , Jacky Bai Cc: Mark Rutland , =?UTF-8?B?QXJ0dXIgxZp3aWdvxYQ=?= , "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 , 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 References: <008f2fa973b23fc716d678c5bd35af54@akkea.ca> From: Martin Kepplinger Autocrypt: addr=martink@posteo.de; keydata= mQINBFULfZABEADRxJqDOYAHfrp1w8Egcv88qoru37k1x0Ugy8S6qYtKLAAt7boZW+q5gPv3 Sj2KjfkWA7gotXpASN21OIfE/puKGwhDLAySY1DGNMQ0gIVakUO0ji5GJPjeB9JlmN5hbA87 Si9k3yKQQfv7Cf9Lr1iZaV4A4yjLP/JQMImaCVdC5KyqJ98Luwci1GbsLIGX3EEjfg1+MceO dnJTKZpBAKd1J7S2Ib3dRwvALdiD7zqMGqkw5xrtwasatS7pc6o/BFgA9GxbeIzKmvW/hc3Q amS/sB12BojyzdUJ3TnIoAqvwKTGcv5VYo2Z+3FV+/MJVXPo8cj2vmfxQx1WG4n6X0pK4X8A 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pHNViNVPohfhJqY2VX4xZfT/V9gK61+pmXzoFIqYmOVal+Q8rPLOOEZBVmtNlicoC7jvWFG/ z/oPHkm5kmAMKdhqc3HcMOt5Ey7+erpN9o56Qy3GA1hv/ygOvLT1QUdsYcuxafqgGg== Message-ID: <9a8dac5b-25c0-7dca-8c25-9796ba2b4df5@posteo.de> Date: Tue, 4 Feb 2020 10:45:19 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org On 20.11.19 19:02, Leonard Crestez wrote: > On 20.11.2019 18:38, Angus Ainslie wrote: >> 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 ? > > Not right now, and imx atf is based on a slightly older version so some > porting effort might be required. > Hi Leonard, Have you, by chance, looked at the mainline ATF side for your devfreq work in the meantime? I'd happily test. (btw. the linux driver fails "nicely" there.) thanks, martin