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

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Message-ID: <9e9b9faf-7c5d-2e83-a8ac-37afeffd81d4@oss.qualcomm.com>
Date: Sat, 24 Jan 2026 16:08:11 +0530
From: Shivendra Pratap <shivendra.pratap@....qualcomm.com>
To: Lorenzo Pieralisi <lpieralisi@...nel.org>
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 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?

thanks,
Shivendra