linux-kernel - Re: [PATCH v3 2/3] iio: adc: Add driver for Renesas RZ/G2L A/D converter

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Date:   Tue, 27 Jul 2021 09:54:20 +0100
From:   "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To:     Philipp Zabel <p.zabel@...gutronix.de>
Cc:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Rob Herring <robh+dt@...nel.org>,
        Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Magnus Damm <magnus.damm@...il.com>,
        Alexandru Ardelean <aardelean@...iqon.com>,
        linux-iio <linux-iio@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Biju Das <biju.das.jz@...renesas.com>
Subject: Re: [PATCH v3 2/3] iio: adc: Add driver for Renesas RZ/G2L A/D converter

Hi Philipp,

On Tue, Jul 27, 2021 at 9:13 AM Philipp Zabel <p.zabel@...gutronix.de> wrote:
>
> On Tue, 2021-07-27 at 09:02 +0100, Lad, Prabhakar wrote:
> [...]
> > > > +     ret = devm_add_action_or_reset(&pdev->dev,
> > > > +                                    rzg2l_adc_reset_assert, adc->adrstn);
> > > > +     if (ret) {
> > > > +             dev_err(&pdev->dev, "failed to register adrstn assert devm action, %d\n",
> > > > +                     ret);
> > > > +             return ret;
> > > > +     }
> > >
> > > This is the wrong way around. Installing devres actions should be done
> > > after the thing they are supposed to revert in case of error. You should
> > > move this down below the reset_control_deassert(adc->adrstn).
> > >
> > Ouch my understanding was, there won't be any harm in asserting the
> > reset line. Agree with will move this below
> > reset_control_deassert(adc->adrstn).
>
> You are probably right, but it's still better do it correctly. Just
> imagine one of the reset lines turns out to be shared later, or somebody
> else will look at this driver for inspiration.
>
Agreed, will do it the right way!

Cheers,
Prabhakar