[PATCH v24 00/12] Implement PSCI reboot mode driver for PSCI resets

[Ulf Hansson]

On Thu, Sep 3, 2026 at 6:04 PM Lee Jones <lee at kernel.org> 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.

Kind regards
Uffe