[RFC PATCH 4/4] power: reset: Implement a PSCI SYSTEM_RESET2 reboot-mode driver

[Pavan Kondeti]

On Wed, Jul 26, 2023 at 10:19:01AM -0700, Elliot Berman wrote:
> 
> 
> On 7/26/2023 3:41 AM, Pavan Kondeti wrote:
> > On Mon, Jul 24, 2023 at 03:30:54PM -0700, Elliot Berman wrote:
> > > PSCI implements a restart notifier for architectural defined resets.
> > > The SYSTEM_RESET2 allows vendor firmware to define additional reset
> > > types which could be mapped to the reboot reason.
> > > 
> > > Implement a driver to wire the reboot-mode framework to make vendor
> > > SYSTEM_RESET2 calls on reboot.
> > > 
> > > Signed-off-by: Elliot Berman <quic_eberman at quicinc.com>
> > 
> > Do we need to skip the PSCI call from the existing PSCI restart notifier
> > which gets called after your newly introduced callback from reboot mode
> > notifier?
> > 
> 
> No need, the vendor SYSTEM_RESET2 call shouldn't return if the call worked.
> 

>From the documentation of restart handlers, restarting from reboot
notifiers may not be correct. Since you hooked it up with reboot-mode
driver framework, you may restart the system much early before the
actual machine restart kicks in. Pls check. 

Thanks,
Pavan