linux-kernel - Re: [RFC PATCH 7/7] irqchip/apple-aic: add SMP support to the Apple AIC driver.

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Date:   Thu, 21 Jan 2021 13:22:37 +0000
From:   Marc Zyngier <maz@...nel.org>
To:     Mohamed Mediouni <mohamed.mediouni@...amail.com>
Cc:     Arnd Bergmann <arnd@...nel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Mark Rutland <mark.rutland@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Hector Martin <marcan@...can.st>, linux-kernel@...r.kernel.org,
        Will Deacon <will@...nel.org>,
        Stan Skowronek <stan@...ellium.com>
Subject: Re: [RFC PATCH 7/7] irqchip/apple-aic: add SMP support to the Apple
 AIC driver.

On 2021-01-21 12:50, Mohamed Mediouni wrote:
>> On 21 Jan 2021, at 13:44, Arnd Bergmann <arnd@...nel.org> wrote:
>> 
>> On Wed, Jan 20, 2021 at 2:27 PM Mohamed Mediouni

[...]

>>> +       aic.fast_ipi = of_property_read_bool(node, "fast-ipi");
>> 
>> Where is this property documented, and what decides which one to use?
> It’s getting documented in the next patch set.
> 
> This property is there to enable support for older iPhone processors
> later on, some of which do not have fast IPI support.
> 
> On Apple M1, fast-ipi is always on.

Then please focus on a single implementation. Additional features can
always be merged later once something is up and running.

Also, there sysregs can be detected by matching the MIDR, so I don't
think we need a DT property for that.

Thanks,

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