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

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Message-ID: <2EE2D63A9E55C55A+aPXBm6t0llG63Knv@kernel.org>
Date: Mon, 20 Oct 2025 12:59:07 +0800
From: Troy Mitchell <troy.mitchell@...ux.spacemit.com>
To: Emil Renner Berthing <emil.renner.berthing@...il.com>,
	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

On Mon, Oct 20, 2025 at 06:55:37AM +0200, Aurelien Jarno wrote:
> 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"?
I think it's "default m if ARCH_SPACEMIT".
because only SpacemiT uses P1.

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