linux-kernel - Re: [PATCH v19 00/10] Implement PSCI reboot mode driver for PSCI resets

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Message-ID: <aXduTklGm6AOeaGG@lpieralisi>
Date: Mon, 26 Jan 2026 14:38:22 +0100
From: Lorenzo Pieralisi <lpieralisi@...nel.org>
To: Shivendra Pratap <shivendra.pratap@....qualcomm.com>
Cc: Florian Fainelli <florian.fainelli@...adcom.com>,
	Krzysztof Kozlowski <krzk@...nel.org>,
	Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>,
	Mukesh Ojha <mukesh.ojha@....qualcomm.com>,
	Andre Draszik <andre.draszik@...aro.org>,
	Kathiravan Thirumoorthy <kathiravan.thirumoorthy@....qualcomm.com>,
	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-arm-msm@...r.kernel.org,
	devicetree@...r.kernel.org, Srinivas Kandagatla <srini@...nel.org>,
	Umang Chheda <umang.chheda@....qualcomm.com>,
	Nirmesh Kumar Singh <nirmesh.singh@....qualcomm.com>,
	Song Xue <quic_songxue@...cinc.com>, Arnd Bergmann <arnd@...db.de>,
	Bjorn Andersson <andersson@...nel.org>,
	Sebastian Reichel <sre@...nel.org>, Rob Herring <robh@...nel.org>,
	Sudeep Holla <sudeep.holla@....com>,
	Souvik Chakravarty <Souvik.Chakravarty@....com>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Andy Yan <andy.yan@...k-chips.com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	Moritz Fischer <moritz.fischer@...us.com>,
	Mark Rutland <mark.rutland@....com>,
	Conor Dooley <conor+dt@...nel.org>,
	Konrad Dybcio <konradybcio@...nel.org>,
	Bartosz Golaszewski <brgl@...nel.org>
Subject: Re: [PATCH v19 00/10] Implement PSCI reboot mode driver for PSCI
 resets

On Sat, Jan 24, 2026 at 04:08:11PM +0530, Shivendra Pratap wrote:
> 
> 
> On 1/6/2026 4:38 PM, Shivendra Pratap wrote:
> > 
> > 
> > On 12/28/2025 10:50 PM, 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 registers with
> >> reboot-mode framework to provide this functionality.
> >>
> >> The PSCI system reset calls takes two arguments: reset_type and cookie.
> >> It defines predefined reset types, such as warm and cold reset, and
> >> vendor-specific reset types which are SoC vendor specific. To support
> >> these requirements, the reboot-mode framework is enhanced in two key
> >> ways:
> >> 1. 64-bit magic support: Extend reboot-mode to handle two 32-bit
> >> arguments (reset_type and cookie) by encoding them into a single 64-bit
> >> magic value.
> >> 2. Predefined modes: Add support for predefined reboot modes in the
> >> framework.
> >>
> >> With these enhancements, the patch series enables:
> >>  - Warm reset and cold reset as predefined reboot modes.
> >>  - Vendor-specific resets exposed as tunables, configurable via the
> >>    SoC-specific device tree.
> >>
> >> Together, these changes allow userspace to trigger all above PSCI resets
> >> from userspace.
> >>
> > 
> > Hi Lorenzo,
> > 
> > Is this patch series now converging towards the design changes you
> > proposed in v17? We’d like to conclude the design so we can move it
> > towards closure.
> 
> Hi Lorenzo,
> 
> Can you please review if the design aligns with your proposed changes?

I will try to do it this week.

Thanks,
Lorenzo