linux-kernel - Re: [PATCH v4 1/2] mfd: syscon: Support physical regmap bus

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Message-ID: <CADBw62rt6ABu5A9ex2PkND-XYXNLV7b=HhG0RX-qxUUBphvSAQ@mail.gmail.com>
Date:   Sun, 17 May 2020 16:56:53 +0800
From:   Baolin Wang <baolin.wang7@...il.com>
To:     Orson Zhai <orsonzhai@...il.com>
Cc:     "lee.jones@...aro.org" <lee.jones@...aro.org>,
        "arnd@...db.de" <arnd@...db.de>, Mark Brown <broonie@...nel.org>,
        Lyra Zhang <zhang.lyra@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 1/2] mfd: syscon: Support physical regmap bus

On Sun, May 17, 2020 at 8:08 AM Orson Zhai <orsonzhai@...il.com> wrote:
>
> On Sat, May 16, 2020 at 6:13 PM Baolin Wang <baolin.wang7@...il.com> wrote:
> >
> > Some platforms such as Spreadtrum platform, define a special method to
> > update bits of the registers instead of reading and writing, which means
> > we should use a physical regmap bus to define the reg_update_bits()
> > operation instead of the MMIO regmap bus.
> >
> > Thus add a a __weak function  for the syscon driver to allow to register
>
> Typo -- duplicated "a".

Ah, right, will fix.

>
> It seems to be a better idea than before.

Let's see Arnd and Lee's opinion.

>
> -Orson
>
> > a physical regmap bus to support this new requirement.
> >
> > Signed-off-by: Baolin Wang <baolin.wang7@...il.com>
> > ---
> >  drivers/mfd/syscon.c       |  9 ++++++++-
> >  include/linux/mfd/syscon.h | 11 +++++++++++
> >  2 files changed, 19 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/mfd/syscon.c b/drivers/mfd/syscon.c
> > index 3a97816d0cba..dc92f3177ceb 100644
> > --- a/drivers/mfd/syscon.c
> > +++ b/drivers/mfd/syscon.c
> > @@ -40,6 +40,13 @@ static const struct regmap_config syscon_regmap_config = {
> >         .reg_stride = 4,
> >  };
> >
> > +struct regmap * __weak syscon_regmap_init(struct device_node *np,
> > +                                         void __iomem *base,
> > +                                         struct regmap_config *syscon_config)
> > +{
> > +       return regmap_init_mmio(NULL, base, syscon_config);
> > +}
> > +
> >  static struct syscon *of_syscon_register(struct device_node *np, bool check_clk)
> >  {
> >         struct clk *clk;
> > @@ -106,7 +113,7 @@ static struct syscon *of_syscon_register(struct device_node *np, bool check_clk)
> >         syscon_config.val_bits = reg_io_width * 8;
> >         syscon_config.max_register = resource_size(&res) - reg_io_width;
> >
> > -       regmap = regmap_init_mmio(NULL, base, &syscon_config);
> > +       regmap = syscon_regmap_init(np, base, &syscon_config);
> >         if (IS_ERR(regmap)) {
> >                 pr_err("regmap init failed\n");
> >                 ret = PTR_ERR(regmap);
> > diff --git a/include/linux/mfd/syscon.h b/include/linux/mfd/syscon.h
> > index 7f20e9b502a5..85088e44fe7c 100644
> > --- a/include/linux/mfd/syscon.h
> > +++ b/include/linux/mfd/syscon.h
> > @@ -13,6 +13,7 @@
> >
> >  #include <linux/err.h>
> >  #include <linux/errno.h>
> > +#include <linux/regmap.h>
> >
> >  struct device_node;
> >
> > @@ -28,6 +29,9 @@ extern struct regmap *syscon_regmap_lookup_by_phandle_args(
> >                                         const char *property,
> >                                         int arg_count,
> >                                         unsigned int *out_args);
> > +extern struct regmap *syscon_regmap_init(struct device_node *np,
> > +                                        void __iomem *base,
> > +                                        struct regmap_config *syscon_config);
> >  #else
> >  static inline struct regmap *device_node_to_regmap(struct device_node *np)
> >  {
> > @@ -59,6 +63,13 @@ static inline struct regmap *syscon_regmap_lookup_by_phandle_args(
> >  {
> >         return ERR_PTR(-ENOTSUPP);
> >  }
> > +
> > +static inline struct regmap *syscon_regmap_init(struct device_node *np,
> > +                                               void __iomem *base,
> > +                                               struct regmap_config *syscon_config)
> > +{
> > +       return ERR_PTR(-ENOTSUPP);
> > +}
> >  #endif
> >
> >  #endif /* __LINUX_MFD_SYSCON_H__ */
> > --
> > 2.17.1
> >



-- 
Baolin Wang