linux-kernel - Re: [PATCH 1/2] pinctrl: samsung: Use platform_get_irq

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Message-ID: <CAHp75VdSBYGTqHUH6=ZW5_LUat3Rg_TW_jNDvbjkU5Q9R4YFig@mail.gmail.com>
Date:   Sat, 25 Dec 2021 17:34:30 +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>,
        Tomasz Figa <tomasz.figa@...il.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Sylwester Nawrocki <s.nawrocki@...sung.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        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>,
        Linux Samsung SOC <linux-samsung-soc@...r.kernel.org>
Subject: Re: [PATCH 1/2] pinctrl: samsung: 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, 0);
> +       if (ret < 0 && ret != -ENXIO)
> +               return ret;
> +       if (ret > 0)
> +               drvdata->irq = ret;

Yes, this is how platform_get_irq_optional() is expected to be used
right now. We are going to fix it a bit, so this code won't be
affected.

-- 
With Best Regards,
Andy Shevchenko