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From: Marc Zyngier <maz@kernel.org>
To: Mohamed Mediouni <mohamed.mediouni@caramail.com>
Cc: Mark Rutland <mark.rutland@arm.com>,
	Arnd Bergmann <arnd@kernel.org>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Hector Martin <marcan@marcan.st>,
	linux-kernel@vger.kernel.org, Will Deacon <will@kernel.org>,
	Linux ARM <linux-arm-kernel@lists.infradead.org>,
	Stan Skowronek <stan@corellium.com>
Subject: Re: [RFC PATCH 7/7] irqchip/apple-aic: add SMP support to the Apple AIC driver.
Date: Thu, 21 Jan 2021 14:10:28 +0000
Message-ID: <7131f110736b8a17c824f39abeeaf711@kernel.org> (raw)
In-Reply-To: <2861E21B-32B9-479E-A5F6-528D021183E6@caramail.com>

On 2021-01-21 13:34, Mohamed Mediouni wrote:
>> On 21 Jan 2021, at 14:22, Marc Zyngier <maz@kernel.org> wrote:
>> 
>> On 2021-01-21 12:50, Mohamed Mediouni wrote:
>>>> On 21 Jan 2021, at 13:44, Arnd Bergmann <arnd@kernel.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...

This series is supposed to cover M1 only, and adding extra support
as part of it is only likely to make the code harder to review.

I'd rather you focus on a single IPI interface (fast or slow,
I don't really care). Extra features can come in later.

Thanks,

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

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Thread overview: 55+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-20 13:27 [RFC PATCH 0/7] Linux on Apple Silicon Mohamed Mediouni
2021-01-20 13:27 ` [RFC PATCH 1/7] arm64: kernel: FIQ support Mohamed Mediouni
2021-01-20 13:27 ` [RFC PATCH 2/7] arm64: kernel: Add a WFI hook Mohamed Mediouni
2021-01-20 16:46   ` Alexander Graf
     [not found]     ` <94C20F55-D3B8-4349-B26F-9EA8AAEBF639@caramail.com>
2021-01-21 12:33       ` Hector Martin 'marcan'
2021-01-21 10:52   ` Arnd Bergmann
2021-01-21 11:01     ` Mohamed Mediouni
2021-01-21 11:36       ` Arnd Bergmann
2021-01-20 13:27 ` [RFC PATCH 3/7] arm64: mm: use nGnRnE instead of nGnRE on Apple processors Mohamed Mediouni
2021-01-20 16:47   ` Alexander Graf
2021-01-20 18:06     ` Mohamed Mediouni
2021-01-20 18:10       ` Alexander Graf
2021-01-21 11:27   ` Will Deacon
2021-01-21 11:38     ` Arnd Bergmann
2021-01-21 11:44     ` Marc Zyngier
2021-01-21 12:47       ` Will Deacon
2021-01-21 15:12         ` Mohamed Mediouni
2021-01-21 16:25           ` Marc Zyngier
2021-01-21 17:55             ` Will Deacon
2021-01-21 18:15               ` Marc Zyngier
2021-01-21 18:22                 ` Mohamed Mediouni
2021-01-21 18:22                 ` Will Deacon
2021-01-20 13:27 ` [RFC PATCH 4/7] irqchip/apple-aic: Add support for Apple AIC Mohamed Mediouni
2021-01-20 17:11   ` Alexander Graf
2021-01-20 18:04     ` Mohamed Mediouni
2021-01-20 20:16       ` Andrew Lunn
2021-01-20 21:18   ` Stan Skowronek
2021-01-21  9:48   ` Linus Walleij
2021-01-21 10:37     ` Arnd Bergmann
2021-01-21 15:29       ` Hector Martin 'marcan'
2021-01-21 17:09         ` Rob Herring
2021-01-21 17:45       ` Rob Herring
2021-01-21 16:44     ` Rob Herring
2021-01-21 16:53   ` Hector Martin 'marcan'
2021-01-20 13:27 ` [RFC PATCH 5/7] arm64/Kconfig: Add Apple Silicon SoC platform Mohamed Mediouni
2021-01-20 13:27 ` [RFC PATCH 6/7] arm64: kernel: Apple CPU start driver Mohamed Mediouni
2021-01-21 11:14   ` Arnd Bergmann
2021-01-20 13:27 ` [RFC PATCH 7/7] irqchip/apple-aic: add SMP support to the Apple AIC driver Mohamed Mediouni
2021-01-21 12:44   ` Arnd Bergmann
2021-01-21 12:50     ` Mohamed Mediouni
2021-01-21 13:00       ` Arnd Bergmann
2021-01-21 13:01         ` Hector Martin 'marcan'
2021-01-21 13:22       ` Marc Zyngier
2021-01-21 13:32         ` Mark Rutland
2021-01-21 14:05           ` Marc Zyngier
2021-01-21 13:34         ` Mohamed Mediouni
2021-01-21 14:10           ` Marc Zyngier [this message]
2021-01-21 15:09             ` Arnd Bergmann
2021-01-21 15:18               ` Mohamed Mediouni
2021-01-21 16:40       ` Rob Herring
2021-01-21 16:43         ` Mohamed Mediouni
2021-01-21 17:37           ` Rob Herring
2021-01-21 18:08             ` Mohamed Mediouni
2021-01-21 18:57               ` Rob Herring
2021-02-02 19:15   ` Linus Walleij

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