linux-kernel - Re: [PATCH v4 2/2] pinctrl: pinctrl-mlxbf: Add pinctrl driver support

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Date:   Fri, 24 Feb 2023 11:44:07 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Asmaa Mnebhi <asmaa@...dia.com>
Cc:     "linus.walleij@...aro.org" <linus.walleij@...aro.org>,
        "bgolaszewski@...libre.com" <bgolaszewski@...libre.com>,
        "niyas.sait@...aro.org" <niyas.sait@...aro.org>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>
Subject: Re: [PATCH v4 2/2] pinctrl: pinctrl-mlxbf: Add pinctrl driver support

On Thu, Feb 23, 2023 at 11:07 PM Asmaa Mnebhi <asmaa@...dia.com> wrote:
>
> > > +static const struct {
> > > +       const char *name;
> > > +       const char * const *group_names;
> >
> > Use this instead
> > https://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-
> > pinctrl.git/tree/include/linux/pinctrl/pinctrl.h?h=devel#n215
> > and this
> > https://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-
> > pinctrl.git/tree/include/linux/pinctrl/pinctrl.h?h=devel#n222
> >
> > > +} mlxbf_pmx_funcs[] = {
> >
> > > +};
>
> so copy that struct definition and macro to my driver? (I don’t see these code changes in master)

Which master?

First of all, you should do your development based on the "for-next"
of the respective subsystem (okay, for pin control Linus Walleij
called his published branch "devel"). So, the above mentioned
functionality was there a while ago.

Second, a couple of days ago Linus Torvalds pulled PR, so it's part of
upstream now.

TL;DR: just use those types and macros in your code.

> > > +       /* This resource is shared so use devm_ioremap */
> >
> > Can you elaborate on who actually requests the region? And why is it not
> > _this_ driver?
>
> This resource is shared with the gpio-mlxbf3.c driver. The gpio-mlxbf3.c driver does not access the same offsets as the pinctrl-mlxbf3.c driver, but it accesses several other registers offsets in between.

Okay, so in such a case you need a common denominator that actually
does this all for you via, for example, regmap. If the region is not
requested, bad things may happen.

-- 
With Best Regards,
Andy Shevchenko