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Date:   Sat, 25 Mar 2023 11:02:59 +0800
From:   Chester Lin <clin@suse.com>
To:     Andy Shevchenko <andy.shevchenko@gmail.com>
Cc:     Linus Walleij <linus.walleij@linaro.org>,
        NXP S32 Linux Team <s32@nxp.com>,
        linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org,
        Ghennadi Procopciuc <Ghennadi.Procopciuc@oss.nxp.com>,
        Andrei Stefanescu <andrei.stefanescu@nxp.com>,
        Radu Pirea <radu-nicolae.pirea@nxp.com>,
        Andreas =?iso-8859-1?Q?F=E4rber?= <afaerber@suse.de>,
        Matthias Brugger <mbrugger@suse.com>
Subject: Re: [PATCH v4 5/5] pinctrl: s32: separate const device data from
 struct s32_pinctrl_soc_info
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On Fri, Mar 24, 2023 at 04:57:01PM +0200, Andy Shevchenko wrote:
> On Fri, Mar 24, 2023 at 4:38 PM Chester Lin <clin@suse.com> wrote:
> >
> > The .data field in struct of_device_id is used as a const member so it's
> > inappropriate to attach struct s32_pinctrl_soc_info with of_device_id
> > because some members in s32_pinctrl_soc_info need to be filled by
> > pinctrl-s32cc at runtime.
> >
> > For this reason, struct s32_pinctrl_soc_info must be allocated in
> > pinctrl-s32cc and then create a new struct s32_pinctrl_soc_data in order
> > to represent const .data in of_device_id. To combine these two structures,
> > a s32_pinctrl_soc_data pointer is introduced in s32_pinctrl_soc_info.
> >
> > Besides, use of_device_get_match_data() instead of of_match_device() since
> > the driver only needs to retrieve the .data from of_device_id.
> 
> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
> (casting question is minor and can be addressed in v5, if can be done,
> or when applying)
> 

Thanks for reviewing this patch!

I will prepare v5 next Monday for solving this question.

Regards,
Chester

> > Suggested-by: Andy Shevchenko <andy.shevchenko@gmail.com>
> > Signed-off-by: Chester Lin <clin@suse.com>
> > ---
> > Changes in v4:
> > - Retrieve the matched device data by calling of_device_get_match_data()
> >   and remove unnecessary type casting. (Merged from the previous v3 series
> >   [PATCH v3 1/6])
> >
> >  drivers/pinctrl/nxp/pinctrl-s32.h   | 14 +++++++++-----
> >  drivers/pinctrl/nxp/pinctrl-s32cc.c | 30 +++++++++++++++++------------
> >  drivers/pinctrl/nxp/pinctrl-s32g2.c | 13 +++++--------
> >  3 files changed, 32 insertions(+), 25 deletions(-)
> >
> > diff --git a/drivers/pinctrl/nxp/pinctrl-s32.h b/drivers/pinctrl/nxp/pinctrl-s32.h
> > index 2f7aecd462e4..add3c77ddfed 100644
> > --- a/drivers/pinctrl/nxp/pinctrl-s32.h
> > +++ b/drivers/pinctrl/nxp/pinctrl-s32.h
> > @@ -34,24 +34,28 @@ struct s32_pin_range {
> >         unsigned int end;
> >  };
> >
> > -struct s32_pinctrl_soc_info {
> > -       struct device *dev;
> > +struct s32_pinctrl_soc_data {
> >         const struct pinctrl_pin_desc *pins;
> >         unsigned int npins;
> > +       const struct s32_pin_range *mem_pin_ranges;
> > +       unsigned int mem_regions;
> > +};
> > +
> > +struct s32_pinctrl_soc_info {
> > +       struct device *dev;
> > +       const struct s32_pinctrl_soc_data *soc_data;
> >         struct s32_pin_group *groups;
> >         unsigned int ngroups;
> >         struct pinfunction *functions;
> >         unsigned int nfunctions;
> >         unsigned int grp_index;
> > -       const struct s32_pin_range *mem_pin_ranges;
> > -       unsigned int mem_regions;
> >  };
> >
> >  #define S32_PINCTRL_PIN(pin)   PINCTRL_PIN(pin, #pin)
> >  #define S32_PIN_RANGE(_start, _end) { .start = _start, .end = _end }
> >
> >  int s32_pinctrl_probe(struct platform_device *pdev,
> > -                       struct s32_pinctrl_soc_info *info);
> > +                     const struct s32_pinctrl_soc_data *soc_data);
> >  int s32_pinctrl_resume(struct device *dev);
> >  int s32_pinctrl_suspend(struct device *dev);
> >  #endif /* __DRIVERS_PINCTRL_S32_H */
> > diff --git a/drivers/pinctrl/nxp/pinctrl-s32cc.c b/drivers/pinctrl/nxp/pinctrl-s32cc.c
> > index 8373468719b6..41e024160f36 100644
> > --- a/drivers/pinctrl/nxp/pinctrl-s32cc.c
> > +++ b/drivers/pinctrl/nxp/pinctrl-s32cc.c
> > @@ -106,7 +106,7 @@ s32_get_region(struct pinctrl_dev *pctldev, unsigned int pin)
> >  {
> >         struct s32_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
> >         const struct s32_pin_range *pin_range;
> > -       unsigned int mem_regions = ipctl->info->mem_regions;
> > +       unsigned int mem_regions = ipctl->info->soc_data->mem_regions;
> >         unsigned int i;
> >
> >         for (i = 0; i < mem_regions; i++) {
> > @@ -688,8 +688,8 @@ int s32_pinctrl_suspend(struct device *dev)
> >         int ret;
> >         unsigned int config;
> >
> > -       for (i = 0; i < info->npins; i++) {
> > -               pin = &info->pins[i];
> > +       for (i = 0; i < info->soc_data->npins; i++) {
> > +               pin = &info->soc_data->pins[i];
> >
> >                 if (!s32_pinctrl_should_save(ipctl, pin->number))
> >                         continue;
> > @@ -713,8 +713,8 @@ int s32_pinctrl_resume(struct device *dev)
> >         struct s32_pinctrl_context *saved_context = &ipctl->saved_context;
> >         int ret, i;
> >
> > -       for (i = 0; i < info->npins; i++) {
> > -               pin = &info->pins[i];
> > +       for (i = 0; i < info->soc_data->npins; i++) {
> > +               pin = &info->soc_data->pins[i];
> >
> >                 if (!s32_pinctrl_should_save(ipctl, pin->number))
> >                         continue;
> > @@ -831,7 +831,7 @@ static int s32_pinctrl_probe_dt(struct platform_device *pdev,
> >         struct resource *res;
> >         struct regmap *map;
> >         void __iomem *base;
> > -       int mem_regions = info->mem_regions;
> > +       unsigned int mem_regions = info->soc_data->mem_regions;
> >         int ret;
> >         u32 nfuncs = 0;
> >         u32 i = 0;
> > @@ -869,7 +869,7 @@ static int s32_pinctrl_probe_dt(struct platform_device *pdev,
> >                 }
> >
> >                 ipctl->regions[i].map = map;
> > -               ipctl->regions[i].pin_range = &info->mem_pin_ranges[i];
> > +               ipctl->regions[i].pin_range = &info->soc_data->mem_pin_ranges[i];
> >         }
> >
> >         nfuncs = of_get_child_count(np);
> > @@ -904,20 +904,26 @@ static int s32_pinctrl_probe_dt(struct platform_device *pdev,
> >  }
> >
> >  int s32_pinctrl_probe(struct platform_device *pdev,
> > -                     struct s32_pinctrl_soc_info *info)
> > +                     const struct s32_pinctrl_soc_data *soc_data)
> >  {
> >         struct s32_pinctrl *ipctl;
> >         int ret;
> >         struct pinctrl_desc *s32_pinctrl_desc;
> > +       struct s32_pinctrl_soc_info *info;
> >  #ifdef CONFIG_PM_SLEEP
> >         struct s32_pinctrl_context *saved_context;
> >  #endif
> >
> > -       if (!info || !info->pins || !info->npins) {
> > +       if (!soc_data || !soc_data->pins || !soc_data->npins) {
> >                 dev_err(&pdev->dev, "wrong pinctrl info\n");
> >                 return -EINVAL;
> >         }
> >
> > +       info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
> > +       if (!info)
> > +               return -ENOMEM;
> > +
> > +       info->soc_data = soc_data;
> >         info->dev = &pdev->dev;
> >
> >         /* Create state holders etc for this driver */
> > @@ -938,8 +944,8 @@ int s32_pinctrl_probe(struct platform_device *pdev,
> >                 return -ENOMEM;
> >
> >         s32_pinctrl_desc->name = dev_name(&pdev->dev);
> > -       s32_pinctrl_desc->pins = info->pins;
> > -       s32_pinctrl_desc->npins = info->npins;
> > +       s32_pinctrl_desc->pins = info->soc_data->pins;
> > +       s32_pinctrl_desc->npins = info->soc_data->npins;
> >         s32_pinctrl_desc->pctlops = &s32_pctrl_ops;
> >         s32_pinctrl_desc->pmxops = &s32_pmx_ops;
> >         s32_pinctrl_desc->confops = &s32_pinconf_ops;
> > @@ -960,7 +966,7 @@ int s32_pinctrl_probe(struct platform_device *pdev,
> >  #ifdef CONFIG_PM_SLEEP
> >         saved_context = &ipctl->saved_context;
> >         saved_context->pads =
> > -               devm_kcalloc(&pdev->dev, info->npins,
> > +               devm_kcalloc(&pdev->dev, info->soc_data->npins,
> >                              sizeof(*saved_context->pads),
> >                              GFP_KERNEL);
> >         if (!saved_context->pads)
> > diff --git a/drivers/pinctrl/nxp/pinctrl-s32g2.c b/drivers/pinctrl/nxp/pinctrl-s32g2.c
> > index d9f3ff6794ea..e0944c071c8c 100644
> > --- a/drivers/pinctrl/nxp/pinctrl-s32g2.c
> > +++ b/drivers/pinctrl/nxp/pinctrl-s32g2.c
> > @@ -721,7 +721,7 @@ static const struct s32_pin_range s32_pin_ranges_siul2[] = {
> >         S32_PIN_RANGE(942, 1007),
> >  };
> >
> > -static struct s32_pinctrl_soc_info s32_pinctrl_info = {
> > +static struct s32_pinctrl_soc_data s32_pinctrl_data = {
> >         .pins = s32_pinctrl_pads_siul2,
> >         .npins = ARRAY_SIZE(s32_pinctrl_pads_siul2),
> >         .mem_pin_ranges = s32_pin_ranges_siul2,
> > @@ -732,7 +732,7 @@ static const struct of_device_id s32_pinctrl_of_match[] = {
> >         {
> >
> >                 .compatible = "nxp,s32g2-siul2-pinctrl",
> > -               .data = (void *) &s32_pinctrl_info,
> > +               .data = (void *) &s32_pinctrl_data,
> >         },
> >         { /* sentinel */ }
> >  };
> > @@ -740,14 +740,11 @@ MODULE_DEVICE_TABLE(of, s32_pinctrl_of_match);
> >
> >  static int s32g_pinctrl_probe(struct platform_device *pdev)
> >  {
> > -       const struct of_device_id *of_id =
> > -               of_match_device(s32_pinctrl_of_match, &pdev->dev);
> > +       const struct s32_pinctrl_soc_data *soc_data;
> >
> > -       if (!of_id)
> > -               return -ENODEV;
> > +       soc_data = of_device_get_match_data(&pdev->dev);
> >
> > -       return s32_pinctrl_probe
> > -                       (pdev, (struct s32_pinctrl_soc_info *) of_id->data);
> > +       return s32_pinctrl_probe(pdev, soc_data);
> >  }
> >
> >  static const struct dev_pm_ops s32g_pinctrl_pm_ops = {
> > --
> > 2.37.3
> >
> 
> 
> -- 
> With Best Regards,
> Andy Shevchenko