linux-kernel - Re: [PATCH v3 6/7] gpio: exar: switch to using regmap

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Message-ID: <CAMpxmJW1j9+KAj12OKs3njUWy+UA5B993Pyd=xmo4k8LM-8GUw@mail.gmail.com>
Date:   Tue, 10 Nov 2020 15:52:00 +0100
From:   Bartosz Golaszewski <bgolaszewski@...libre.com>
To:     Jan Kiszka <jan.kiszka@...mens.com>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Linus Walleij <linus.walleij@...aro.org>,
        David Laight <David.Laight@...lab.com>,
        linux-gpio <linux-gpio@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 6/7] gpio: exar: switch to using regmap

On Tue, Nov 10, 2020 at 3:50 PM Jan Kiszka <jan.kiszka@...mens.com> wrote:
>
>
> On 10.11.20 15:30, Bartosz Golaszewski wrote:
> > On Tue, Nov 10, 2020 at 3:26 PM Andy Shevchenko
> > <andriy.shevchenko@...ux.intel.com> wrote:
> >>
> >> On Tue, Nov 10, 2020 at 04:26:24PM +0200, Andy Shevchenko wrote:
> >>> On Tue, Nov 10, 2020 at 01:34:05PM +0100, Bartosz Golaszewski wrote:
> >>>> From: Bartosz Golaszewski <bgolaszewski@...libre.com>
> >>>>
> >>>> We can simplify the code in gpio-exar by using regmap. This allows us to
> >>>> drop the mutex (regmap provides its own locking) and we can also reuse
> >>>> regmap's bit operations instead of implementing our own update function.
> >>>
> >>> ...
> >>>
> >>>> +   /*
> >>>> +    * We don't need to check the return values of mmio regmap operations (unless
> >>>> +    * the regmap has a clock attached which is not the case here).
> >>>> +    */
> >>>> +   exar_gpio->regs = devm_regmap_init_mmio(dev, p, &exar_regmap_config);
> >>>> +   if (IS_ERR(exar_gpio->regs))
> >>>> +           return PTR_ERR(exar_gpio->regs);
> >>>>
> >>>>     index = ida_alloc(&ida_index, GFP_KERNEL);
> >>>> -   if (index < 0) {
> >>>> -           ret = index;
> >>>> -           goto err_mutex_destroy;
> >>>> -   }
> >>>> +   if (index < 0)
> >>>> +           return index;
> >>>
> >>> And below you effectively use p as regmap!
> >>> That's what renaming of variable regs -> regmap or map can easily reveal.
> >>>
> >>>       exar_gpio->regs = p;
> >>
> >> Jan, if you remove this line, does it help?
> >>
> >
> > Ha! I guess you were right saying that keeping the name is asking for
> > trouble then. :)
> >
> > I think that may be it but address width should still be changed to 16.
> >
>
> Removing the line that Andy found made things work here. And switching
> to 16 for reg_bits didn't make things worse again.
>
> Jan

Alright! I'll send a v4 with these things fixed then.

Bartosz