linux-kernel - Re: [PATCH 2/2] pinctrl: at91-pio4: Use platform_get_irq

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Message-ID: <CAHp75VdTOHK4NaYWLmtotzBrGZBkokpC9iK9ggfhiTzyz-QNQg@mail.gmail.com>
Date:   Sat, 25 Dec 2021 17:36:24 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Cc:     "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Ludovic Desroches <ludovic.desroches@...rochip.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Rob Herring <robh+dt@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Prabhakar <prabhakar.csengg@...il.com>,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 2/2] pinctrl: at91-pio4: Use platform_get_irq_optional()
 to get the interrupt

On Sat, Dec 25, 2021 at 3:59 AM 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().


> +               ret = platform_get_irq_optional(pdev, i);
> +               if (ret < 0) {
>                         dev_err(dev, "missing irq resource for group %c\n",
>                                 'A' + i);
> -                       return -EINVAL;
> +                       return ret;
>                 }

This is an incorrect use of platform_get_irq_optional() (It's not
related to what Alexandre said, it's an additional comment).
NAK.

-- 
With Best Regards,
Andy Shevchenko