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 14:34:24 +0100
From:   Mohamed Mediouni <mohamed.mediouni@...amail.com>
To:     Marc Zyngier <maz@...nel.org>
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 21 Jan 2021, at 14:22, Marc Zyngier <maz@...nel.org> wrote:
> 
> 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,
> 
Because UART access adapters for the new M1 Macs aren’t plentiful
at all, I actually use this for development, with iPhones which have 
much more easy to buy Lightning-to-UART adapters.

(That’s why the old implementation is there too)

Might be worth splitting the new one to a new commit though...

Thank you,
>        M.
> -- 
> Jazz is not dead. It just smells funny...