linux-kernel - Re: [PATCH v2 1/2] driver: reset: spacemit-p1: add driver for poweroff/reboot

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Message-ID: <aPXAyeDC7YXAketm@aurel32.net>
Date: Mon, 20 Oct 2025 06:55:37 +0200
From: Aurelien Jarno <aurelien@...el32.net>
To: Emil Renner Berthing <emil.renner.berthing@...il.com>
Cc: linux-kernel@...r.kernel.org, Lee Jones <lee@...nel.org>,
	Sebastian Reichel <sre@...nel.org>,
	Troy Mitchell <troy.mitchell@...ux.spacemit.com>,
	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 v2 1/2] driver: reset: spacemit-p1: add driver for
 poweroff/reboot

Hi Emil,

On 2025-10-19 22:53, Emil Renner Berthing wrote:
> On Sun, 19 Oct 2025 at 22:34, Aurelien Jarno <aurelien@...el32.net> 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>
> > Acked-by: Troy Mitchell <troy.mitchell@...ux.spacemit.com>
> > Tested-by: Troy Mitchell <troy.mitchell@...ux.spacemit.com>
> > ---
> > v2:
> >  - Rebase onto v6.18-rc1
> >  - Use dev_err_probe() to simplify the code
> >  - Fix indentation of patch 1
> >  - Collect Acked-by and Tested-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..063202923d95d 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
> > +       bool "SpacemiT P1 poweroff and reset driver"
> 
> The driver code looks to be written to work as a module, but here it
> says "bool" not "tristate".

I have just tested to build it as a module, and it indeed works that 
way. I'll change that to tristate in the next version.

> > +       depends on ARCH_SPACEMIT || COMPILE_TEST
> > +       select MFD_SPACEMIT_P1
> > +       default ARCH_SPACEMIT
> 
> If it does work as a module I'd prefer "default m" here.

Do you mean "default m" or "default m if ARCH_SPACEMIT"?

Regards
Aurelien

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