Re: [PATCH] irqchip/renesas-irqc: Use platform_get_irq_optional() to get the interrupt

[Lad, Prabhakar]

Hi Andy,

Thank you for the review.

On Sat, Dec 25, 2021 at 4:46 PM Andy Shevchenko
<andy.shevchenko@xxxxxxxxx> wrote:
>
> On Thu, Dec 16, 2021 at 9:52 AM Lad Prabhakar
> <prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx> 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_optional().
>
>
> > +               ret = platform_get_irq_optional(pdev, k);
> > +               if (ret == -EPROBE_DEFER)
> > +                       goto err_runtime_pm_disable;
> > +               if (ret < 0)
> >                         break;
>
> The best approach is
>
> ret = platform_get_irq_optional(...);
> if (ret < 0 && ret != -ENXIO)
>   return ret;
> if (ret > 0)
>   ...we got it...
>
> It will allow the future API fix of platform_get_irq_optional() to be
> really optional.
>
Later patch [0] (merged into -next) does check for -ENXIO first.

[0] https://lore.kernel.org/lkml/20211216182121.5323-1-prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx/t/

Cheers,
Prabhakar