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

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Date:   Tue, 10 Nov 2020 15:30:10 +0100
From:   Bartosz Golaszewski <bgolaszewski@...libre.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Bartosz Golaszewski <brgl@...ev.pl>,
        Linus Walleij <linus.walleij@...aro.org>,
        Jan Kiszka <jan.kiszka@...mens.com>,
        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 3:26 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.

Bartosz