linux-kernel - Re: [PATCH] irqchip/renesas-irqc: Use platform_get_irq

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Date:   Sat, 25 Dec 2021 23:58:59 +0000
From:   "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <maz@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] irqchip/renesas-irqc: Use platform_get_irq_optional() to
 get the interrupt

Hi Andy,

On Sat, Dec 25, 2021 at 5:40 PM Andy Shevchenko
<andy.shevchenko@...il.com> wrote:
>
> On Sat, Dec 25, 2021 at 7:28 PM Lad, Prabhakar
> <prabhakar.csengg@...il.com> wrote:
> > On Sat, Dec 25, 2021 at 4:46 PM Andy Shevchenko
> > <andy.shevchenko@...il.com> wrote:
> > > On Thu, Dec 16, 2021 at 9:52 AM Lad Prabhakar
> > > <prabhakar.mahadev-lad.rj@...renesas.com> wrote:
>
> > > 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@bp.renesas.com/t/
>
> The problem is that it doesn't consider 0 as no IRQ.
>
Can you please point me to the discussion/patch where this API change
is considered/discussed. Just to clarify now the new API for
platform_get_irq_optional() will return "0" in case there is no
interrupt and not not -ENXIO anymore?

When will this patch be merged for the new api, so that I can base my
patches on top of it to avoid more changes?

Cheers,
Prabhakar