linux-kernel - Re: [PATCH v2 2/3] i2c: sh_mobile: Use platform_get_irq

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Date:   Sat, 25 Dec 2021 19:48:46 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        bcm-kernel-feedback-list <bcm-kernel-feedback-list@...adcom.com>,
        Nicolas Saenz Julienne <nsaenz@...nel.org>,
        Chris Brandt <chris.brandt@...esas.com>,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        linux-i2c <linux-i2c@...r.kernel.org>,
        linux-rpi-kernel <linux-rpi-kernel@...ts.infradead.org>,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Prabhakarprabhakar.csengg@...il.com
Subject: Re: [PATCH v2 2/3] i2c: sh_mobile: Use platform_get_irq_optional() to
 get the interrupt

On Wed, Dec 22, 2021 at 2:41 PM Lad Prabhakar
<prabhakar.mahadev-lad.rj@...renesas.com> wrote:
>
> platform_get_resource(pdev, IORESOURCE_IRQ, ..) relies on static
> allocation of IRQ resources in DT core code, this causes an issue
> when using hierarchical interrupt domains using "interrupts" property
> in the node as this bypasses the hierarchical setup and messes up the
> irq chaining.
>
> In preparation for removal of static setup of IRQ resource from DT core
> code use platform_get_irq_optional() for DT users only.

...

> +       if (np) {

Same comments as per your other patches, i.e.
Why is this check here?

> +               int irq;
> +
> +               while ((irq = platform_get_irq_optional(dev, k)) != -ENXIO) {

Consider 0 as no IRQ.

> +                       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 %pa\n", &n);
> +                               dev_err(&dev->dev, "cannot request IRQ %d\n", irq);
>                                 return ret;
>                         }
> +                       k++;
> +               };
> +       } else {
> +               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++;
>                 }
> -               k++;
>         }

-- 
With Best Regards,
Andy Shevchenko