linux-kernel - Re: [PATCH v4 1/2] driver: reset: spacemit-p1: add driver for poweroff/reboot

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Message-ID: <aP8KqZ1hlqfQVPii@aurel32.net>
Date: Mon, 27 Oct 2025 07:01:13 +0100
From: Aurelien Jarno <aurelien@...el32.net>
To: Troy Mitchell <troy.mitchell@...ux.spacemit.com>
Cc: linux-kernel@...r.kernel.org, Lee Jones <lee@...nel.org>,
	Sebastian Reichel <sre@...nel.org>, Yixun Lan <dlan@...too.org>,
	Paul Walmsley <pjw@...nel.org>, Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>, Alexandre Ghiti <alex@...ti.fr>,
	"open list:RISC-V ARCHITECTURE:Keyword:riscv" <linux-riscv@...ts.infradead.org>,
	"open list:RISC-V SPACEMIT SoC Support:Keyword:spacemit" <spacemit@...ts.linux.dev>,
	"open list:SYSTEM RESET/SHUTDOWN DRIVERS" <linux-pm@...r.kernel.org>
Subject: Re: [PATCH v4 1/2] driver: reset: spacemit-p1: add driver for
 poweroff/reboot

On 2025-10-27 11:20, Troy Mitchell wrote:
> On Sun, Oct 26, 2025 at 11:41:14PM +0100, Aurelien Jarno wrote:
> > This driver implements poweroff/reboot support for the SpacemiT P1 PMIC
> > chip, which is commonly paired with the SpacemiT K1 SoC.
> > 
> > The SpacemiT P1 support is implemented as a MFD driver, so the access is
> > done directly through the regmap interface. Reboot or poweroff is
> > triggered by setting a specific bit in a control register, which is
> > automatically cleared by the hardware afterwards.
> > 
> > Signed-off-by: Aurelien Jarno <aurelien@...el32.net>
> > ---
> > v2:
> >  - Replace the "select" by a "depends on"
> >  - Remove outdated Reviewed-by
> > 
> >  drivers/power/reset/Kconfig              |  9 +++
> >  drivers/power/reset/Makefile             |  1 +
> >  drivers/power/reset/spacemit-p1-reboot.c | 88 ++++++++++++++++++++++++
> >  3 files changed, 98 insertions(+)
> >  create mode 100644 drivers/power/reset/spacemit-p1-reboot.c
> > 
> > diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig
> > index 8248895ca9038..61c16f3d5abc7 100644
> > --- a/drivers/power/reset/Kconfig
> > +++ b/drivers/power/reset/Kconfig
> > @@ -283,6 +283,15 @@ config POWER_RESET_KEYSTONE
> >  	help
> >  	  Reboot support for the KEYSTONE SoCs.
> >  
> > +config POWER_RESET_SPACEMIT_P1
> > +	tristate "SpacemiT P1 poweroff and reset driver"
> > +	depends on ARCH_SPACEMIT || COMPILE_TEST
> > +	depends on MFD_SPACEMIT_P1
> > +	default m
> default m if ARCH_SPACEMIT?

As explained here, this is equivalent:
https://lore.kernel.org/spacemit/CAJM55Z_BzfRo5aKf2VrneTymSizwDQq6OfMK_LNgyoGjp43K8Q@mail.gmail.com/

But I can make a v5 to change that, if it's the preferred form on the 
SpacemiT side.

> Or default ARCH_SPACEMIT?
> I believe that reboot and shutdown are actually essential functionalities,
> so it might make more sense: default ARCH_SPACEMIT?

That was already changed in v3, following a request on v2:
https://lore.kernel.org/spacemit/CANBLGczi3GeaC4aWECV8NS-zqSHgRa-5onynz9fGsZeN8qgysg@mail.gmail.com/

Regards
Aurelien

-- 
Aurelien Jarno                          GPG: 4096R/1DDD8C9B
aurelien@...el32.net                     http://aurel32.net