linux-kernel - Re: [PATCH v2 3/4] pinctrl: s32cc: refactor pin config parsing

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Date:   Tue, 21 Mar 2023 13:01:15 +0800
From:   Chester Lin <clin@...e.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        NXP S32 Linux Team <s32@....com>,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Ghennadi Procopciuc <Ghennadi.Procopciuc@....nxp.com>,
        Andrei Stefanescu <andrei.stefanescu@....com>,
        Radu Pirea <radu-nicolae.pirea@....com>,
        Andreas Färber <afaerber@...e.de>,
        Matthias Brugger <mbrugger@...e.com>
Subject: Re: [PATCH v2 3/4] pinctrl: s32cc: refactor pin config parsing

On Mon, Mar 20, 2023 at 07:06:53PM +0200, Andy Shevchenko wrote:
> On Mon, Mar 20, 2023 at 6:39 PM Chester Lin <clin@...e.com> wrote:
> >
> > Move common codes into smaller inline functions and remove some argument
> > handlings that are not actually used by either S32 MSCR register or generic
> > config params.
> 
> ...
> 
> >         case PIN_CONFIG_OUTPUT_ENABLE:
> > -               if (arg)
> > -                       *config |= S32_MSCR_OBE;
> > -               else
> > -                       *config &= ~S32_MSCR_OBE;
> > +               *config |= S32_MSCR_OBE;
> >                 *mask |= S32_MSCR_OBE;
> >                 break;
> >         case PIN_CONFIG_INPUT_ENABLE:
> > -               if (arg)
> > -                       *config |= S32_MSCR_IBE;
> > -               else
> > -                       *config &= ~S32_MSCR_IBE;
> > +               *config |= S32_MSCR_IBE;
> >                 *mask |= S32_MSCR_IBE;
> >                 break;
> 
> Isn't it a regression here?
> Otherwise needs an explicit explanation in the commit message on
> what's going on here and why it's not a regression.

Oops, it's wrong implementation. The argument checks of OUTPUT_EN and INPUT_EN
shouldn't be dropped. Thanks for the reminder and I will fix it.

Regards,
Chester

> 
> ...
> 
> >         case PIN_CONFIG_BIAS_DISABLE:
> > -               *config &= ~(S32_MSCR_PUS | S32_MSCR_PUE);
> > -               *mask |= S32_MSCR_PUS | S32_MSCR_PUE;
> > +               s32_pin_set_pull(param, mask, config);
> >                 break;
> 
> This now can be unified with PU and PD cases above.
> 
> -- 
> With Best Regards,
> Andy Shevchenko