linux-kernel - Re: [PATCH 2/3] i2c: sh_mobile: Use platform_get_irq

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Date:   Mon, 20 Dec 2021 11:58:51 +0000
From:   "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To:     Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Rob Herring <robh+dt@...nel.org>,
        Nicolas Saenz Julienne <nsaenz@...nel.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        bcm-kernel-feedback-list@...adcom.com,
        Chris Brandt <chris.brandt@...esas.com>,
        Linux I2C <linux-i2c@...r.kernel.org>,
        linux-rpi-kernel@...ts.infradead.org,
        LAK <linux-arm-kernel@...ts.infradead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Prabhakar <prabhakar.csengg@...il.com>
Subject: Re: [PATCH 2/3] i2c: sh_mobile: Use platform_get_irq_optional() to
 get the interrupt

Hi Wolfram,

Thank you for the review.

On Mon, Dec 20, 2021 at 10:16 AM Wolfram Sang
<wsa+renesas@...g-engineering.com> wrote:
>
> Hi Prabhakar,
>
> > +     if (!np) {
>
> Very minor nit: Maybe 'if (np)' and switch the blocks? Positive logic is
> a tad easier to read.
>
OK will update it for v2.

> > +             struct resource *res;
> > +             resource_size_t n;
> > +
> > +             while ((res = platform_get_resource(dev, IORESOURCE_IRQ, k))) {
> > +                     for (n = res->start; n <= res->end; n++) {
> > +                             ret = devm_request_irq(&dev->dev, n, sh_mobile_i2c_isr,
> > +                                                    0, dev_name(&dev->dev), pd);
> > +                             if (ret) {
> > +                                     dev_err(&dev->dev, "cannot request IRQ %pa\n", &n);
> > +                                     return ret;
> > +                             }
> > +                     }
> > +                     k++;
> > +             }
>
> Yeah, it is good to keep the legacy block as is.
>
> > +             do {
> > +                     irq = platform_get_irq_optional(dev, k);
> > +                     if (irq <= 0 && irq != -ENXIO)
> > +                             return irq ? irq : -ENXIO;
> > +                     if (irq == -ENXIO)
> > +                             break;
> > +                     ret = devm_request_irq(&dev->dev, irq, sh_mobile_i2c_isr,
> > +                                            0, dev_name(&dev->dev), pd);
> >                       if (ret) {
> > -                             dev_err(&dev->dev, "cannot request IRQ %pa\n", &n);
> > +                             dev_err(&dev->dev, "cannot request IRQ %d\n", irq);
> >                               return ret;
> >                       }
> > -             }
> > -             k++;
> > +                     k++;
> > +             } while (irq);
>
> In addition to the 'irq == 0' case from patch 1, I tried to shorten the
> block for the np-case. I only came up with this. The assigntment and
> comparison of the while-argument is not exactly pretty, but the block
> itself is easier to read. I'll let you decide.
>
>                 while (irq = platform_get_irq_optional(dev, k) != -ENXIO) {
>                         if (irq < 0)
>                                 return irq;
>
>                         ret = devm_request_irq(&dev->dev, irq, sh_mobile_i2c_isr,
>                                                0, dev_name(&dev->dev), pd);
>                         if (ret) {
>                                 dev_err(&dev->dev, "cannot request IRQ %d\n", irq);
>                                 return ret;
>                         }
>                         k++;
>                 }
>
> Only brainstorming, not even build tested.
>
LGTM, I'll give that a shot.

Cheers,
Prabhakar