linux-kernel - Re: [PATCH] pinctrl: microchip-sgpio: Fix support for regmap

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Message-ID: <20220127104023.5dwcrod7toi4hpb7@soft-dev3-1.localhost>
Date:   Thu, 27 Jan 2022 11:40:23 +0100
From:   Horatiu Vultur <horatiu.vultur@...rochip.com>
To:     Colin Foster <colin.foster@...advantage.com>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-gpio@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <lars.povlsen@...rochip.com>, <Steen.Hegelund@...rochip.com>,
        <UNGLinuxDriver@...rochip.com>, <linus.walleij@...aro.org>
Subject: Re: [PATCH] pinctrl: microchip-sgpio: Fix support for regmap

The 01/25/2022 08:46, Colin Foster wrote:
> 
> Hi Horatiu,

Hi Colin,

> 
> On Tue, Jan 25, 2022 at 05:12:45PM +0100, Horatiu Vultur wrote:
> > Initially the driver accessed the registers using u32 __iomem but then
> > in the blamed commit it changed it to use regmap. The problem is that now
> > the offset of the registers is not calculated anymore at word offset but
> > at byte offset. Therefore make sure to multiply the offset with word size.
> >
> 
> Sorry about this one. I see it must have slipped through the cracks
> because I had made the same change in my tree. The only difference is I
> had copied reg_stride into sgpio_priv instead of making regmap_config
> file-scope. For what its worth, with apologies:

No worries, sorry that I missed your patch initially. And thanks for
reviewing this patch.

> 
> Reviewed-by: Colin Foster <colin.foster@...advantage.com>



> 
> > Fixes: 2afbbab45c261a ("pinctrl: microchip-sgpio: update to support regmap")
> > Signed-off-by: Horatiu Vultur <horatiu.vultur@...rochip.com>
> > ---
> >  drivers/pinctrl/pinctrl-microchip-sgpio.c | 13 +++++++------
> >  1 file changed, 7 insertions(+), 6 deletions(-)
> >
> > diff --git a/drivers/pinctrl/pinctrl-microchip-sgpio.c b/drivers/pinctrl/pinctrl-microchip-sgpio.c
> > index 8e081c90bdb2..2999c98bbdee 100644
> > --- a/drivers/pinctrl/pinctrl-microchip-sgpio.c
> > +++ b/drivers/pinctrl/pinctrl-microchip-sgpio.c
> > @@ -98,6 +98,12 @@ static const struct sgpio_properties properties_sparx5 = {
> >       .regoff = { 0x00, 0x06, 0x26, 0x04, 0x05, 0x2a, 0x32, 0x3a, 0x3e, 0x42 },
> >  };
> >
> > +static const struct regmap_config regmap_config = {
> > +             .reg_bits = 32,
> > +             .val_bits = 32,
> > +             .reg_stride = 4,
> > +};
> > +
> >  static const char * const functions[] = { "gpio" };
> >
> >  struct sgpio_bank {
> > @@ -137,7 +143,7 @@ static inline int sgpio_addr_to_pin(struct sgpio_priv *priv, int port, int bit)
> >
> >  static inline u32 sgpio_get_addr(struct sgpio_priv *priv, u32 rno, u32 off)
> >  {
> > -     return priv->properties->regoff[rno] + off;
> > +     return (priv->properties->regoff[rno] + off) * regmap_config.reg_stride;
> >  }
> >
> >  static u32 sgpio_readl(struct sgpio_priv *priv, u32 rno, u32 off)
> > @@ -821,11 +827,6 @@ static int microchip_sgpio_probe(struct platform_device *pdev)
> >       struct clk *clk;
> >       u32 __iomem *regs;
> >       u32 val;
> > -     struct regmap_config regmap_config = {
> > -             .reg_bits = 32,
> > -             .val_bits = 32,
> > -             .reg_stride = 4,
> > -     };
> >
> >       priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> >       if (!priv)
> > --
> > 2.33.0
> >

-- 
/Horatiu