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Subject: Re: [PATCH 1/2] clocksource/drivers/exynos_mct: Prioritise Arm arch
 timer on arm64
To:     Chanwoo Choi <cw00.choi@samsung.com>, Will Deacon <will@kernel.org>
Cc:     linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        Marek Szyprowski <m.szyprowski@samsung.com>,
        Krzysztof Kozlowski <krzk@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>,
        Thomas Gleixner <tglx@linutronix.de>
References: <20210608154341.10794-1-will@kernel.org>
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 <20210608154341.10794-2-will@kernel.org>
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 <2a0181ea-a26e-65e9-16f6-cc233b6b296f@linaro.org>
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 <20210617214748.GC25403@willie-the-truck>
 <d79ebd58-1c4e-834c-fc06-482f25f6f3de@linaro.org>
 <20210621101058.GB28788@willie-the-truck>
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 <d3e55130-ccfc-4bbc-3c82-91db4ce5113f@samsung.com>
From:   Daniel Lezcano <daniel.lezcano@linaro.org>
Message-ID: <1f4d7943-c540-bafd-b372-0d0ed8172f33@linaro.org>
Date:   Tue, 22 Jun 2021 07:21:46 +0200
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On 22/06/2021 04:40, Chanwoo Choi wrote:
> On 6/21/21 7:18 PM, Daniel Lezcano wrote:
>> On 21/06/2021 12:10, Will Deacon wrote:
>>
>> [ ... ]
>>
>>>>> exynos4_mct_frc_start() is called unconditionally from probe via
>>>>> exynos4_clocksource_init() so as long as the mct probes first, then the
>>>>> arch timer should work, no? The rating shouldn't affect that.
>>>>
>>>> How do you ensure the exynos mct is probed before the arch timer ?
>>>>
>>>> The Makefile provides the right order, but the dependency is implicit.
>>>
>>> Currently, I think it's done by the order of the CPU hotplug notifiers (
>>> see the hunk of 6282edb72bed which touches cpuhotplug.h).
>>
>> Ah, right. Indeed whatever the DT order, the cpuhotplug order solves the
>> dependency.
>>
>> Chanwoo, are fine with this change ?
> 
> OK about the order.
> 
> Actually, I have not fully tested the arch timer on Exynos5433 64bit
> because of the dependency between arch timer and MCT as we knew.
> 
> If the Krzysztof and Marek have no any objection,
> I have no any objection anymore. Thanks.
> 

Shall I consider it as an Acked-by ?

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