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

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Date:   Tue, 23 Nov 2021 09:12:01 +0000
From:   Marc Zyngier <maz@...nel.org>
To:     Sander Vanheule <sander@...nheule.net>
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>,
        Geert Uytterhoeven <geert+renesas@...der.be>
Subject: Re: [PATCH] of/irq: Add a quirk for controllers with their own definition of interrupt-map

On Tue, 23 Nov 2021 08:40:29 +0000,
Sander Vanheule <sander@...nheule.net> wrote:
> 
> Hi Marc,
> 
> On Mon, 2021-11-22 at 10:30 +0000, Marc Zyngier wrote:
> > Since 041284181226 ("of/irq: Allow matching of an interrupt-map local
> > to an interrupt controller"), a handful of interrupt controllers have
> > stopped working correctly. This is due to the DT exposing a non-sensical
> > interrupt-map property, and their drivers relying on the kernel ignoring
> > this property.
> > 
> > Since we cannot realistically fix this terrible behaviour, add a quirk
> > for the limited set of devices that have implemented this monster,
> > and document that this is a pretty bad practice.
> > 
> > Cc: Rob Herring <robh@...nel.org>
> > Cc: John Crispin <john@...ozen.org>
> > Cc: Biwen Li <biwen.li@....com>
> > Cc: Chris Brandt <chris.brandt@...esas.com>
> > Cc: Geert Uytterhoeven <geert+renesas@...der.be>
> > Signed-off-by: Marc Zyngier <maz@...nel.org>
> 
> Thanks for the patch. As far as I can tell, this restores the old
> behaviour from 5.15 for "realtek,rtl-intc" and things work as
> expected.

Thanks for testing. Let's see what Rob says about this approach (I bet
he won't be thrilled...).

	M.

-- 
Without deviation from the norm, progress is not possible.