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

[Nirmesh Kumar Singh]

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 at oss.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 at oss.qualcomm.com>

Thanks,
Nirmesh