linux-kernel - Re: [PATCH 2/9] soc: samsung: exynos-pmu: Add exynos_pmu

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Message-ID: <CADrjBPpchS0NdqS-mRmmatOksGHc4KdRniJXGDPTS1z73eU9kA@mail.gmail.com>
Date: Wed, 24 Jan 2024 10:21:05 +0000
From: Peter Griffin <peter.griffin@...aro.org>
To: Arnd Bergmann <arnd@...db.de>
Cc: Rob Herring <robh+dt@...nel.org>, krzysztof.kozlowski+dt@...aro.org, 
	Guenter Roeck <linux@...ck-us.net>, Wim Van Sebroeck <wim@...ux-watchdog.org>, 
	Conor Dooley <conor+dt@...nel.org>, Alim Akhtar <alim.akhtar@...sung.com>, jaewon02.kim@...sung.com, 
	chanho61.park@...sung.com, Sam Protsenko <semen.protsenko@...aro.org>, 
	kernel-team@...roid.com, Tudor Ambarus <tudor.ambarus@...aro.org>, 
	André Draszik <andre.draszik@...aro.org>, 
	saravanak@...gle.com, William McVicker <willmcvicker@...gle.com>, linux-fsd@...la.com, 
	linux-watchdog@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
	linux-samsung-soc@...r.kernel.org
Subject: Re: [PATCH 2/9] soc: samsung: exynos-pmu: Add exynos_pmu_update/read/write
 APIs and SoC quirks

Hi Arnd,

On Tue, 23 Jan 2024 at 08:11, Arnd Bergmann <arnd@...db.de> wrote:
>
> On Mon, Jan 22, 2024, at 23:57, Peter Griffin wrote:
>
> > --- a/include/linux/soc/samsung/exynos-pmu.h
> > +++ b/include/linux/soc/samsung/exynos-pmu.h
> > @@ -21,11 +21,39 @@ enum sys_powerdown {
> >  extern void exynos_sys_powerdown_conf(enum sys_powerdown mode);
> >  #ifdef CONFIG_EXYNOS_PMU
> >  extern struct regmap *exynos_get_pmu_regmap(void);
> > +extern int exynos_pmu_update_bits(unsigned int offset, unsigned int
> > mask,
> > +                               unsigned int val);
> > +extern int exynos_pmu_update(unsigned int offset, unsigned int mask,
> > +                          unsigned int val);
> > +extern int exynos_pmu_write(unsigned int offset, unsigned int val);
> > +extern int exynos_pmu_read(unsigned int offset, unsigned int *val);
> >  #else
> >  static inline struct regmap *exynos_get_pmu_regmap(void)
> >  {
> >       return ERR_PTR(-ENODEV);
> >  }
> > +
> > +static inline int exynos_pmu_update_bits(unsigned int offset, unsigned
> > int mask,
> > +                                      unsigned int val);
> > +{
> > +     return ERR_PTR(-ENODEV);
> > +}
> > +
> > +static inline int exynos_pmu_update(unsigned int offset, unsigned int
> > mask,
> > +                                 unsigned int val);
> > +{
> > +     return ERR_PTR(-ENODEV);
> > +}
>
> This won't build since you have the wrong return type.
> I would suggest you just remove the #ifdef check entirely
> and instead require drivers using this to have correct
> dependencies.

Whoops, will fix it in v2. We need those stubs for platforms like
ARCH_S3C64XX that don't have a PMU but use some of the same drivers.

Thanks,

Peter.