linux-kernel - RE: [PATCH] of/irq: Add a quirk for controllers with their own definition of interrupt-map

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Message-ID: <OSZPR01MB7019E7DD7119EFF9C994AA62AA649@OSZPR01MB7019.jpnprd01.prod.outlook.com>
Date:   Sat, 27 Nov 2021 00:42:49 +0000
From:   Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@...renesas.com>
To:     Marc Zyngier <maz@...nel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Rob Herring <robh@...nel.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "kernel-team@...roid.com" <kernel-team@...roid.com>,
        John Crispin <john@...ozen.org>, Biwen Li <biwen.li@....com>,
        Chris Brandt <Chris.Brandt@...esas.com>,
        "linux-renesas-soc@...r.kernel.org" 
        <linux-renesas-soc@...r.kernel.org>,
        "Lad, Prabhakar" <prabhakar.csengg@...il.com>
Subject: RE: [PATCH] of/irq: Add a quirk for controllers with their own
 definition of interrupt-map

Hi Marc,

> -----Original Message-----
> From: Marc Zyngier <maz@...nel.org>
> Sent: 23 November 2021 09:11
> To: Geert Uytterhoeven <geert@...ux-m68k.org>
> Cc: linux-kernel@...r.kernel.org; devicetree@...r.kernel.org; kernel-team@...roid.com; Rob Herring
> <robh@...nel.org>; John Crispin <john@...ozen.org>; Biwen Li <biwen.li@....com>; Chris Brandt
> <Chris.Brandt@...esas.com>; linux-renesas-soc@...r.kernel.org; Prabhakar Mahadev Lad
> <prabhakar.mahadev-lad.rj@...renesas.com>
> Subject: Re: [PATCH] of/irq: Add a quirk for controllers with their own definition of interrupt-map
> 
> On Tue, 23 Nov 2021 08:44:19 +0000,
> Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
> >
> > Hi Marc,
> >
> > On Tue, Nov 23, 2021 at 9:33 AM Marc Zyngier <maz@...nel.org> wrote:
> > > On Tue, 23 Nov 2021 07:57:48 +0000,
> > > Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
> > > > Summarized:
> > > >   - Before the bad commit, and after your fix, irqc-rza1 is invoked,
> > > >     and the number of interrupts seen is correct, but input events
> > > >     are doubled.
> > > >   - After the bad commit, irqc-rza1 is not invoked, and there is an
> > > >     interrupt storm, but input events are OK.
> > >
> > > OK, that's reassuring, even if the "twice the events" stuff isn't
> > > what you'd expect. We at least know this is a separate issue, and
> > > that this patch on top of -rc1 brings you back to the 5.15 behaviour.
> > >
> > > I'd expect it to be the case for the other platforms as well.
> >
> > OK.
> >
> > BTW, what would have been the correct way to do this for irqc-rza1?
> > I think we're about to make the same mistake with RZ/G2L IRQC
> > support[1]?
> 
> Indeed, and I was about to look into it.
> 
> There are multiple ways to skin this cat, including renaming 'interrupt-map' to 'my-own-private-
> interrupt-map'. Or use something akin the new 'msi-range' (which we could call interrupt-range), and
> replace:
> 
>   interrupt-map = <0 0 &gic GIC_SPI 4 IRQ_TYPE_LEVEL_HIGH>,
>                   <1 0 &gic GIC_SPI 5 IRQ_TYPE_LEVEL_HIGH>,
>                   <2 0 &gic GIC_SPI 6 IRQ_TYPE_LEVEL_HIGH>,
>                   <3 0 &gic GIC_SPI 7 IRQ_TYPE_LEVEL_HIGH>,
>                   <4 0 &gic GIC_SPI 8 IRQ_TYPE_LEVEL_HIGH>,
>                   <5 0 &gic GIC_SPI 9 IRQ_TYPE_LEVEL_HIGH>,
>                   <6 0 &gic GIC_SPI 10 IRQ_TYPE_LEVEL_HIGH>,
>                   <7 0 &gic GIC_SPI 11 IRQ_TYPE_LEVEL_HIGH>;
> 
> with:
> 
>   interrupt-range = <&gic GIC_SPI 4 IRQ_TYPE_LEVEL_HIGH 0 8>;
> 
Just to clarify, do you suggest to add interrupt-range as a generic DT property or SoC/company specific property? If you meant to add generic property where would you suggest to document this property?

Maybe to chime in with "msi-ranges" we could name it to "interrupt-ranges"?

Cheers,
Prabhakar

> which reads as "base interrupt spec", "start pin", "count".  This gives you almost the same level of
> information, and doesn't interfere with the rest of the DT properties. Parsing it is also much
> simpler.
> But that's up to you, really.
> 
> 	M.
> 
> --
> Without deviation from the norm, progress is not possible.