linux-kernel - Re: [PATCH 2/2] pinctrl: ocelot: Fix pincfg

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Message-ID: <20220708194112.wkbn5uw5ous6hzwz@soft-dev3-1.localhost>
Date:   Fri, 8 Jul 2022 21:41:12 +0200
From:   Horatiu Vultur <horatiu.vultur@...rochip.com>
To:     Colin Foster <colin.foster@...advantage.com>
CC:     <linux-gpio@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linus.walleij@...aro.org>, <kavyasree.kotagiri@...rochip.com>,
        <alexandre.belloni@...tlin.com>, <UNGLinuxDriver@...rochip.com>,
        <maxime.chevallier@...tlin.com>
Subject: Re: [PATCH 2/2] pinctrl: ocelot: Fix pincfg

The 07/07/2022 17:31, Colin Foster wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> 
> Hi Horatiu,

Hi Colin,

> 
> On Thu, Jul 07, 2022 at 08:53:42PM +0200, Horatiu Vultur wrote:
> > The blamed commit changed to use regmaps instead of __iomem. But it
> > didn't update the register offsets to be at word offset, so it uses byte
> > offset.
> >
> > Fixes: 076d9e71bcf8 ("pinctrl: ocelot: convert pinctrl to regmap")
> > Signed-off-by: Horatiu Vultur <horatiu.vultur@...rochip.com>
> 
> Sorry about this one. It sounded familiar though:
> https://patchwork.ozlabs.org/project/linux-gpio/patch/20220125161245.418882-1-horatiu.vultur@microchip.com/
> 
> The only takeaway from that was the use of regmap_get_reg_stride, which
> was done in
> commit baf927a833ca ("microchip-sgpio: Fix support for regmap")

That is correct. I will update this to use regmap_get_reg_stride.

> 
> And I see it is only for pincfg - which I don't have any hardware to
> test that. Apologies again!

No worries.

> 
> > ---
> >  drivers/pinctrl/pinctrl-ocelot.c | 28 +++++++++++++++-------------
> >  1 file changed, 15 insertions(+), 13 deletions(-)
> >
> > diff --git a/drivers/pinctrl/pinctrl-ocelot.c b/drivers/pinctrl/pinctrl-ocelot.c
> > index 6212abe2b66f..e84f2f82901f 100644
> > --- a/drivers/pinctrl/pinctrl-ocelot.c
> > +++ b/drivers/pinctrl/pinctrl-ocelot.c
> > @@ -303,6 +303,13 @@ static const char *const ocelot_function_names[] = {
> >       [FUNC_RCVRD_CLK]        = "rcvrd_clk",
> >  };
> >
> > +const struct regmap_config regmap_pincfg = {
> > +             .reg_bits = 32,
> > +             .val_bits = 32,
> > +             .reg_stride = 4,
> > +             .name = "pincfg",
> > +};
> > +
> >  struct ocelot_pmx_func {
> >       const char **groups;
> >       unsigned int ngroups;
> > @@ -1334,7 +1341,8 @@ static int ocelot_hw_get_value(struct ocelot_pinctrl *info,
> >       if (info->pincfg) {
> >               u32 regcfg;
> >
> > -             ret = regmap_read(info->pincfg, pin, &regcfg);
> > +             ret = regmap_read(info->pincfg, pin * regmap_pincfg.reg_stride,
> > +                               &regcfg);
> >               if (ret)
> >                       return ret;
> >
> > @@ -1368,14 +1376,16 @@ static int ocelot_pincfg_clrsetbits(struct ocelot_pinctrl *info, u32 regaddr,
> >       u32 val;
> >       int ret;
> >
> > -     ret = regmap_read(info->pincfg, regaddr, &val);
> > +     ret = regmap_read(info->pincfg, regaddr * regmap_pincfg.reg_stride,
> > +                       &val);
> >       if (ret)
> >               return ret;
> >
> >       val &= ~clrbits;
> >       val |= setbits;
> >
> > -     ret = regmap_write(info->pincfg, regaddr, val);
> > +     ret = regmap_write(info->pincfg, regaddr * regmap_pincfg.reg_stride,
> > +                        val);
> >
> >       return ret;
> >  }
> > @@ -1940,21 +1950,13 @@ static struct regmap *ocelot_pinctrl_create_pincfg(struct platform_device *pdev)
> >  {
> >       void __iomem *base;
> >
> > -     const struct regmap_config regmap_config = {
> > -             .reg_bits = 32,
> > -             .val_bits = 32,
> > -             .reg_stride = 4,
> > -             .max_register = 32,
> > -             .name = "pincfg",
> > -     };
> > -
> > -     base = devm_platform_ioremap_resource(pdev, 1);
> > +             base = devm_platform_ioremap_resource(pdev, 1);
> >       if (IS_ERR(base)) {
> >               dev_dbg(&pdev->dev, "Failed to ioremap config registers (no extended pinconf)\n");
> >               return NULL;
> >       }
> >
> > -     return devm_regmap_init_mmio(&pdev->dev, base, &regmap_config);
> > +     return devm_regmap_init_mmio(&pdev->dev, base, &regmap_pincfg);
> >  }
> >
> >  static int ocelot_pinctrl_probe(struct platform_device *pdev)
> > --
> > 2.33.0
> >

-- 
/Horatiu