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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 1296CC624D3 for ; Fri, 4 Sep 2026 14:00:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:In-Reply-To:From:References:Cc:To:Subject:MIME-Version:Date: Message-ID:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=Jxs2oaGwNjggxYlTmrfnys1Rey8M2EkDDSrCRn43Mpc=; b=0PVxUvwWaWr4k7iUKsPTkLXTTB 2U+mdPSAs9A7n4yHJOy+ptTNd8AgUMYF8EYJHG9kJM5ecYLP2AIGRJVvfPhOM2R+2rvzfrkpgLgrD uIS30AguKhOttjWN/z+yTuqVBVK5GEVu0f+UL6mJHwwfPr9FkFCf0+mY2is4HuzXX32s+UW5EHUsy bxxEJhPV9JYm061lA6G1cpx02hj2G+Zi9vqnbwjMME/NE/YOaG1TaRcBimJ5DyMpkbkst3LHlcLzh zyMC477W4tNpS6/zsLEJM2dHrYhgylSjnJffnsFyczEc0AGuApsDtK6mVT9lQkOtoTzVjFX9hADGB CCulmXyQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1x2USN-00000002JU0-3wfd; Fri, 04 Sep 2026 13:59:51 +0000 Received: from mx0a-0031df01.pphosted.com ([205.220.168.131]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1x2USL-00000002JSH-0uXv for linux-arm-kernel@lists.infradead.org; Fri, 04 Sep 2026 13:59:50 +0000 Received: from pps.filterd (m0279864.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.18.1.11/8.18.1.11) with ESMTP id 684Dh1e92537656 for ; Fri, 4 Sep 2026 13:59:48 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=qualcomm.com; h= cc:content-transfer-encoding:content-type:date:from:in-reply-to :message-id:mime-version:references:subject:to; s=qcppdkim1; bh= Jxs2oaGwNjggxYlTmrfnys1Rey8M2EkDDSrCRn43Mpc=; b=fY4xsw7HwR9/FMO3 jOCQfqol95XN0fLUfd+N7N9h9PW9lOFV19GbCzojuA+I13RdKhzgtKmrd7n8dszf prafltu/5WW2i4NjouPgcSrgFodABKV5nC952ErfIgC43A9skmCRrCs5FOWzuWKz /HnqL4OULbe00I1oaZuoG9BpYT+Y1wQVIQBgKsE2AZDdPJ1usaoCjyFxPSWtwzmn KwjyRAJcfQsNFRuwcbQyCK0RuFnOsLqMyw3eg9yw9D3soWAOporGKiIyX8pCTcwq jjGbBEkZdiDzedjEcCrUG2ZeLiYaH31aRza3C6znRn8fK3ajtjc3A1OZUVX+R8XD nyKfwg== Received: from mail-pj1-f71.google.com (mail-pj1-f71.google.com [209.85.216.71]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 4gfpmqt0at-1 (version=TLSv1.3 cipher=TLS_AES_128_GCM_SHA256 bits=128 verify=NOT) for ; Fri, 04 Sep 2026 13:59:48 +0000 (GMT) Received: by mail-pj1-f71.google.com with SMTP id 98e67ed59e1d1-3968dfff779so1585026a91.1 for ; Fri, 04 Sep 2026 06:59:48 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oss.qualcomm.com; s=google; t=1788530388; x=1789135188; darn=lists.infradead.org; h=content-transfer-encoding:content-type:in-reply-to:from :content-language:references:cc:to:subject:user-agent:mime-version :date:message-id:from:to:cc:subject:date:message-id:reply-to :content-type; bh=Jxs2oaGwNjggxYlTmrfnys1Rey8M2EkDDSrCRn43Mpc=; b=KuxYwu6Nay2+5jsH+6R7LkLc48ZFZhgNAbfwBVLigI6OpEWFGoUHb/WnnOCpQfEiF5 JB2ixOCP75uaxxH28rYEHPObOkWFvj46aCI0D3k0N0T9r3MY78ac8kLFxfTLs2BKwvWb hfsQjNs0D66ciCDe/XWkTdkfsmz3YKZkZE7lQbQdJCl6MsgOAG+mlPZtGiRU5DVwSBob GXMOn1PG3LaU4kVYzyNGj7L9Pd3nIIN+jHjzEYdzpvsZ6+UdszHSROgaOmxzKLuS4hBa qF1mDBYmdOL6wkPAjs2OcjyWQOacKLY7KfxkhUbxPzlldBHz0feAZdwRgkCKyPihY6Oe ydgg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1788530388; x=1789135188; h=content-transfer-encoding:content-type:in-reply-to:from :content-language:references:cc:to:subject:user-agent:mime-version :date:message-id:x-gm-gg:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to:content-type; bh=Jxs2oaGwNjggxYlTmrfnys1Rey8M2EkDDSrCRn43Mpc=; b=HhdfL27VXayk4c3ZhlxTMITMJXr4jGjTqbQBS2RxmWC3Ctjee6xwqvfQ6e+maBVZSK IosY8aXpRxVlqo0EZVXdVdlIh4SdRAlB2h6gTvimROhxIXQXLNrnYVaoopLr07/yJodd a+Jg0A396CoN3O0rq0nVHRM01LMtkpbUVtRUsYxDYPGSnh9cxweAxuFFzYx/IYM9oadr xcR8KtuKu4NKa+i4YGCf9ELvLRsPwOasPEMhrfikUft4NIJTgUeT0K7QaMj6WCqgNFn4 qzZx+9X9SqZbqy/vtOGXfDYQWc8LF7gJSAZdmfkT6GLTgFM74GAdm6UnMSZOEYMFrY5r 5juQ== X-Forwarded-Encrypted: i=1; AKwUvBwgVxuuzTgIG87Iv7TRd73e9wQNshBFKOaqHkeLZhz9qCQIXh96Gvr/jR6j/wji90OYc6TzjEJHdO3NulJxTk0l@lists.infradead.org X-Gm-Message-State: AFuF++lhLYLVOxJr18dyv6IXajTVM5BNQbdRXnxmOrBXUC2Cdu8Fb4a1 NgkjJWYEvJCS5qBjgeMiGZA4NtEWzA0h+99Dh2jZB1hhsW22oe3MSf5/4P6Wy3LqLV85Bij9MC5 mEJkTKB2TajPfDszGuuOfvPg5BzpkFvPVzuUbHFMiTjAsBMCDBUliiiRxDyvh6/XdEePo2QiHNl ePOQ== X-Gm-Gg: AYBFou1yzuJgrho2iIf6Zlv3Zee5++PriNJAWl3TaKImvDMdVlTfDrlJ3WF7dVFs2Wh K+/LIlxXYriuzZ4WR/RyVSlZeD/81YjahBJWjNbC7Z+ERtzOaJ1q9fg+ElCProVO4skPj9+Ld0Q Zad29K5/xM/+z+DltTyiXQzGUDKmiyjBGzRma6N8xIVqnJWPRhiJzp75vok0xc58TCKzwf1HTt9 Zp/RCxCiErULGdqx8Yb86XZNiXlyJKC8Dngu0t3/dIvKMgDFJZdg8IHBsIF+5tcPqznaHy3cZlm 4sxTpCSrP5BCYFQkxZjbqmKGGQyIRsqz7cWpqKqFMRupffrxlnvZKga03UMDLjfmYBR8fSegJXa aNBDIHCTtA/scW1yIZmMEBWyTbt0WNY2s+gM= X-Received: by 2002:a17:90b:4b90:b0:369:7491:7b24 with SMTP id 98e67ed59e1d1-39b07f2f31fmr14673344a91.6.1788530387617; Fri, 04 Sep 2026 06:59:47 -0700 (PDT) X-Received: by 2002:a17:90b:4b90:b0:369:7491:7b24 with SMTP id 98e67ed59e1d1-39b07f2f31fmr14673267a91.6.1788530387149; Fri, 04 Sep 2026 06:59:47 -0700 (PDT) Received: from [192.168.29.31] ([49.43.235.14]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-3339af25062sm10478642eec.16.2026.09.04.06.59.35 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 04 Sep 2026 06:59:46 -0700 (PDT) Message-ID: <8968c292-0613-4420-82f9-2e3fbf30d81e@oss.qualcomm.com> Date: Fri, 4 Sep 2026 19:29:33 +0530 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v24 00/12] Implement PSCI reboot mode driver for PSCI resets To: Ulf Hansson , Lee Jones Cc: Lorenzo Pieralisi , Arnd Bergmann , Bjorn Andersson , Sebastian Reichel , Rob Herring , Souvik Chakravarty , Krzysztof Kozlowski , Andy Yan , Matthias Brugger , Mark Rutland , Conor Dooley , Konrad Dybcio , John Stultz , Moritz Fischer , "Rafael J. Wysocki" , Daniel Lezcano , Christian Loehle , Ulf Hansson , Pavan Kondeti , Bartosz Golaszewski , Sudeep Holla , Florian Fainelli , Krzysztof Kozlowski , Dmitry Baryshkov , Mukesh Ojha , Andre Draszik , Greg Kroah-Hartman , Kathiravan Thirumoorthy , linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, mfd@lists.linux.dev, Srinivas Kandagatla , Bartosz Golaszewski , Song Xue References: <20260803-arm-psci-system_reset2-vendor-reboots-v24-0-889281373870@oss.qualcomm.com> <20260903160401.GV2133376@google.com> Content-Language: en-US From: Shivendra Pratap In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Proofpoint-Spam-Info: AW1haW4tMjYwOTA0MDEyNyBTYWx0ZWRfX9mefLRfLxFls 7FoMu1CsRdoKm1m0ZsGu/vpslHHRH+2J0b2CJ4lMbcOejTHUQiuJtvDbfshNuC1UinFrHKTe8AR Gjq1k1Tg+g9Z/kSbpmsEhlXBCsU+91w= X-Authority-Analysis: v=2.4 cv=eovvCIpX c=1 sm=1 tr=0 ts=6a9aced4 cx=c_pps a=UNFcQwm+pnOIJct1K4W+Mw==:117 a=KLk5RGObiDQBJbYytlEIzQ==:17 a=IkcTkHD0fZMA:10 a=VdqzKS8jKosA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=DJpcGTmdVt4CTyJn9g5Z:22 a=VwQbUJbxAAAA:8 a=KpQgwA5mMx-DUpL1sGUA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=uKXjsCUrEbL0IQVhDsJ9:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwOTA0MDEyNyBTYWx0ZWRfX8HBHWHOeVu3g Pl5e+qESeaO5GIYdH+OoQ+D6sfAbAUS6j+MsqxXBS1L/uLE3R5g9myhKKOBQOJ4Ptx3htYCMaB1 +5lVisGoXXtUCEV5xHb8BjFbwcZuwCkVaITdmDyjpwBX88QHKjZ+kYWuA0kS1CAHnss723siNxM MOKN0tGdKkv2HT1GggPixJwPnJipS5XEI2v8XVwR/Bj2J0nqxmkYKFK9M/W5xSOO9vfDYkPUFzd owrKcLvPv5k9bk/Kkd2HXv2U9SUMPCxhZJtB/hjox3wxIqIy3w6DgxbL9m47g9PN9lnaVC4hCkS 66dXfr1bcnK4MKb2P3FKflkFXwGeMovJ3GigMK6KViAOjfGxSWCGBMdsXqVP3apTd6giWdEN0wV 583dQaI07YvNPaGaF7lbkZZeJVHvS90OtTyD+T7An2b1ceBQhND1qAUHk/NWyRNQeWZfAkfAv0G ztbTw+ZHqLp2y5YZviw== X-Proofpoint-ORIG-GUID: 6T3ZvT-i230Rgg4C64zOtW19RV87xMKu X-Proofpoint-GUID: 6T3ZvT-i230Rgg4C64zOtW19RV87xMKu X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-09-04_04,2026-09-03_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 phishscore=0 impostorscore=0 spamscore=0 adultscore=0 lowpriorityscore=0 bulkscore=0 suspectscore=0 clxscore=1015 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2609040127 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260904_065949_258971_3001E713 X-CRM114-Status: GOOD ( 21.68 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 9/4/2026 12:47 PM, Ulf Hansson wrote: > On Thu, Sep 3, 2026 at 6:04 PM Lee Jones wrote: >> >> On Mon, 03 Aug 2026, Shivendra Pratap wrote: >> >>> Userspace should be able to initiate device reboots using the various >>> PSCI SYSTEM_RESET and SYSTEM_RESET2 types defined by PSCI spec. This >>> patch series introduces psci-reboot-mode driver that will induce >>> command-based resets to psci driver for executing the device reset. >> >> The more I read through this submission, the more convinced I get that >> it does not belong in MFD. This is a potentially nice "architectural >> workaround" if it a) didn't break some of MFD's fundamental "real >> devices only" rules, of which cpuidle and reboot-mode certainly are not >> and b) didn't require a massive expansion of what the MFD core is >> designed to do. I am more that a little uncomfortable with the 150 >> lines being added to MFD core support this workaround. >> >> My best suggestion so far would be to base these changes inside >> drivers/firmware/psci and use the aux bus to communicate with the >> various components. > > We had some off list discussions about this as well and it seems like > we are in agreement. What you are suggesting makes perfect sense to > me. Thanks for reviews. I will move this to Aux and re-post. thanks, Shivendra