linux-kernel - Re: [PATCH v2 14/25] dt-bindings: interrupt-controller: Add DT bindings for apple-aic

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Message-ID: <bba8e6790f4fc24fc2e9ecaa5d9eeabe@kernel.org>
Date:   Tue, 16 Feb 2021 11:45:09 +0000
From:   Marc Zyngier <maz@...nel.org>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     Hector Martin <marcan@...can.st>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Rob Herring <robh@...nel.org>, Olof Johansson <olof@...om.net>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Mark Kettenis <mark.kettenis@...all.nl>,
        Tony Lindgren <tony@...mide.com>,
        Mohamed Mediouni <mohamed.mediouni@...amail.com>,
        Stan Skowronek <stan@...ellium.com>,
        Alexander Graf <graf@...zon.com>,
        Will Deacon <will@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Mark Rutland <mark.rutland@....com>,
        DTML <devicetree@...r.kernel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 14/25] dt-bindings: interrupt-controller: Add DT
 bindings for apple-aic

On 2021-02-16 09:41, Arnd Bergmann wrote:
> On Mon, Feb 15, 2021 at 1:17 PM Hector Martin <marcan@...can.st> wrote:
>> +
>> +      The 2nd cell contains the interrupt number.
>> +        - HW IRQs: interrupt number
>> +        - FIQs:
>> +          - 0: physical HV timer
>> +          - 1: virtual HV timer
>> +          - 2: physical guest timer
>> +          - 3: virtual guest timer
> 
> I wonder if you could just model the FIQ as a single shared level 
> interrupt
> (which is essentially what it is), and have every driver that uses it 
> do a
> request_irq() on the same IRQ number.

And every driver would simply fail, because we don't allow sharing of
per-CPU interrupts.

         M.
-- 
Jazz is not dead. It just smells funny...