linux-kernel - Re: [PATCH 2/2] gpio: rcar: Use platform_get

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Date:   Sat, 25 Dec 2021 14:54:21 +0000
From:   "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>
Subject: Re: [PATCH 2/2] gpio: rcar: Use platform_get_irq() to get the interrupt

Hi Andy,

Thank you for the review.

On Sat, Dec 25, 2021 at 2:49 PM Andy Shevchenko
<andy.shevchenko@...il.com> wrote:
>
> On Fri, Dec 24, 2021 at 9:21 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 bypassed the hierarchical setup and messed up the
> > irq chaining.
> >
> > In preparation for removal of static setup of IRQ resource from DT core
> > code use platform_get_irq().
>
> ...
>
> > -       if (devm_request_irq(dev, irq->start, gpio_rcar_irq_handler,
> > +       if (devm_request_irq(dev, p->irq_parent, gpio_rcar_irq_handler,
> >                              IRQF_SHARED, name, p)) {
> >                 dev_err(dev, "failed to request IRQ\n");
> >                 ret = -ENOENT;
>
> While at it, you may unshadow the error code
> ret = devm_request_irq(...);
> if (ret) {
>   ...
> }
>
Agreed, will do.

Cheers,
Prabhakar