linux-kernel - Re: [PATCH v2 09/10] pinctrl: renesas: Switch to use DEFINE_NOIRQ_DEV_PM

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Date:   Tue, 18 Jul 2023 12:05:25 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Paul Cercueil <paul@...pouillou.net>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Balsam CHIHI <bchihi@...libre.com>,
        Claudiu Beznea <claudiu.beznea@...rochip.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Thierry Reding <thierry.reding@...il.com>,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-renesas-soc@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-pm@...r.kernel.org, Andy Shevchenko <andy@...nel.org>,
        Sean Wang <sean.wang@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Andrew Lunn <andrew@...n.ch>,
        Gregory Clement <gregory.clement@...tlin.com>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Ludovic Desroches <ludovic.desroches@...rochip.com>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>
Subject: Re: [PATCH v2 09/10] pinctrl: renesas: Switch to use
 DEFINE_NOIRQ_DEV_PM_OPS() helper

Hi Paul,

On Mon, Jul 17, 2023 at 9:12 PM Paul Cercueil <paul@...pouillou.net> wrote:
> Le lundi 17 juillet 2023 à 20:28 +0300, Andy Shevchenko a écrit :
> > Since pm.h provides a helper for system no-IRQ PM callbacks,
> > switch the driver to use it instead of open coded variant.
> >
> > Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> > ---
> >  drivers/pinctrl/renesas/core.c | 16 +++++++---------
> >  1 file changed, 7 insertions(+), 9 deletions(-)
> >
> > diff --git a/drivers/pinctrl/renesas/core.c
> > b/drivers/pinctrl/renesas/core.c
> > index 0c8d081da6a8..34232b016960 100644
> > --- a/drivers/pinctrl/renesas/core.c
> > +++ b/drivers/pinctrl/renesas/core.c
> > @@ -649,7 +649,7 @@ static const struct of_device_id
> > sh_pfc_of_table[] = {
> >  };
> >  #endif
> >
> > -#if defined(CONFIG_PM_SLEEP) && defined(CONFIG_ARM_PSCI_FW)
> > +#if defined(CONFIG_ARM_PSCI_FW)
> >  static void sh_pfc_nop_reg(struct sh_pfc *pfc, u32 reg, unsigned int
> > idx)
> >  {
> >  }
> > @@ -732,15 +732,13 @@ static int sh_pfc_resume_noirq(struct device
> > *dev)
> >                 sh_pfc_walk_regs(pfc, sh_pfc_restore_reg);
> >         return 0;
> >  }
> > -
> > -static const struct dev_pm_ops sh_pfc_pm  = {
> > -       SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(sh_pfc_suspend_noirq,
> > sh_pfc_resume_noirq)
> > -};
> > -#define DEV_PM_OPS     &sh_pfc_pm
> >  #else
> >  static int sh_pfc_suspend_init(struct sh_pfc *pfc) { return 0; }
> > -#define DEV_PM_OPS     NULL
> > -#endif /* CONFIG_PM_SLEEP && CONFIG_ARM_PSCI_FW */
> > +static int sh_pfc_suspend_noirq(struct device *dev) { return 0; }
> > +static int sh_pfc_resume_noirq(struct device *dev) { return 0; }
> > +#endif /* CONFIG_ARM_PSCI_FW */
> > +
> > +static DEFINE_NOIRQ_DEV_PM_OPS(sh_pfc_pm, sh_pfc_suspend_noirq,
> > sh_pfc_resume_noirq);
> >
> >  #ifdef DEBUG
> >  #define SH_PFC_MAX_REGS                300
> > @@ -1418,7 +1416,7 @@ static struct platform_driver sh_pfc_driver = {
> >         .driver         = {
> >                 .name   = DRV_NAME,
> >                 .of_match_table = of_match_ptr(sh_pfc_of_table),
> > -               .pm     = DEV_PM_OPS,
> > +               .pm     = pm_sleep_ptr(&sh_pfc_pm),
>
> I think you could do:
>
> .pm = IF_PTR(IS_ENABLED(CONFIG_ARM_PSCI_FW), pm_sleep_ptr(&sh_pfc_pm)),
>
> Then you wouldn't need the #if defined(CONFIG_ARM_PSCI_FW) guard either
> (as long as the code still compiles fine when that config option is
> disabled), and you wouldn't need those dummy callbacks.

Unfortunately not, as the code refers to psci_ops.cpu_suspend.

You could create a small wrapper for that, though.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds