linux-kernel - Re: [PATCH v16 05/14] power: reset: reboot-mode: Expose sysfs for registered reboot

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Message-ID: <f44083bf-a54b-415c-8650-a57b3b482572@oss.qualcomm.com>
Date: Wed, 15 Oct 2025 14:15:29 +0530
From: Nirmesh Kumar Singh <nirmesh.singh@....qualcomm.com>
To: Shivendra Pratap <shivendra.pratap@....qualcomm.com>,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>,
        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>,
        Conor Dooley
 <conor+dt@...nel.org>,
        Andy Yan <andy.yan@...k-chips.com>,
        Mark Rutland <mark.rutland@....com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Arnd Bergmann <arnd@...db.de>, Konrad Dybcio <konradybcio@...nel.org>,
        cros-qcom-dts-watchers@...omium.org, Vinod Koul <vkoul@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Florian Fainelli <florian.fainelli@...adcom.com>,
        Moritz Fischer <moritz.fischer@...us.com>,
        John Stultz <john.stultz@...aro.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Krzysztof Kozlowski <krzk@...nel.org>
Cc: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>,
        Mukesh Ojha <mukesh.ojha@....qualcomm.com>,
        Stephen Boyd <swboyd@...omium.org>,
        Andre Draszik
 <andre.draszik@...aro.org>,
        Kathiravan Thirumoorthy <kathiravan.thirumoorthy@....qualcomm.com>,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-arm-msm@...r.kernel.org,
        Elliot Berman <quic_eberman@...cinc.com>,
        Srinivas Kandagatla <srini@...nel.org>
Subject: Re: [PATCH v16 05/14] power: reset: reboot-mode: Expose sysfs for
 registered reboot_modes


On 10/15/2025 10:08 AM, Shivendra Pratap wrote:
> Currently, there is no standardized mechanism for userspace to
> discover which reboot-modes are supported on a given platform.
> This limitation forces tools and scripts to rely on hardcoded
> assumptions about the supported reboot-modes.
>
> Create a class 'reboot-mode' and a device under it to expose a
> sysfs interface to show the available reboot mode arguments to
> userspace. Use the driver_name field of the struct
> reboot_mode_driver to create the device. For device-based
> drivers, configure the device driver name as driver_name.
>
> This results in the creation of:
>    /sys/class/reboot-mode/<driver>/reboot_modes
>
> This read-only sysfs file will exposes the list of supported
> reboot modes arguments provided by the driver, enabling userspace
> to query the list of arguments.
>
> Align the clean up path to maintain backward compatibility for
> existing reboot-mode based drivers.
>
> Signed-off-by: Shivendra Pratap <shivendra.pratap@....qualcomm.com>
> ---
>   drivers/power/reset/reboot-mode.c | 127 ++++++++++++++++++++++++++++++--------
>   include/linux/reboot-mode.h       |   2 +
>   2 files changed, 103 insertions(+), 26 deletions(-)
Reviewed-by: Nirmesh Kumar Singh <nirmesh.singh@....qualcomm.com>

Thanks,
Nirmesh