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    SubjectRe: [RFC PATCH 7/7] irqchip/apple-aic: add SMP support to the Apple AIC driver.
    On Thu, Jan 21, 2021 at 1:50 PM Mohamed Mediouni
    <mohamed.mediouni@caramail.com> wrote:
    > > On 21 Jan 2021, at 13:44, Arnd Bergmann <arnd@kernel.org> wrote:
    > >> @@ -186,8 +325,11 @@ static int __init apple_aic_init(struct device_node *node,
    > >> if (WARN(!aic.base, "unable to map aic registers\n"))
    > >> return -EINVAL;
    > >>
    > >> + 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.

    Ok, makes sense. Does fast-ipi mean you cannot use the other mode at
    all, or is it just faster as implied by the name? If so, how much faster?

    Arnd

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