linux-kernel - Re: [PATCH v5 0/8] clocksource: Fix MIPS GIC and DW APB Timer for Baikal-T1 SoC support

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Date:   Fri, 22 May 2020 17:44:55 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Serge Semin <Sergey.Semin@...kalelectronics.ru>
Cc:     Serge Semin <fancer.lancer@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Maxim Kaurkin <Maxim.Kaurkin@...kalelectronics.ru>,
        Pavel Parkhomenko <Pavel.Parkhomenko@...kalelectronics.ru>,
        Ramil Zaripov <Ramil.Zaripov@...kalelectronics.ru>,
        Ekaterina Skachko <Ekaterina.Skachko@...kalelectronics.ru>,
        Vadim Vlasov <V.Vlasov@...kalelectronics.ru>,
        Alexey Kolotnikov <Alexey.Kolotnikov@...kalelectronics.ru>,
        Paul Burton <paulburton@...nel.org>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Arnd Bergmann <arnd@...db.de>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Rob Herring <robh+dt@...nel.org>, linux-mips@...r.kernel.org,
        linux-rtc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 0/8] clocksource: Fix MIPS GIC and DW APB Timer for
 Baikal-T1 SoC support

On 22/05/2020 17:41, Serge Semin wrote:
> On Fri, May 22, 2020 at 05:28:42PM +0200, Daniel Lezcano wrote:
>> On 21/05/2020 22:48, Serge Semin wrote:
>>> As for all Baikal-T1 SoC related patchsets, which need this, we replaced
>>> the DW APB Timer legacy plain text-based dt-binding file with DT schema.
>>> Similarly the MIPS GIC bindings file is also converted to DT schema seeing
>>> it also defines the MIPS GIC Timer binding.
>>>
>>> Aside from MIPS-specific r4k timer Baikal-T1 chip also provides a
>>> functionality of two another timers: embedded into the MIPS GIC timer and
>>> three external DW timers available over APB bus. But we can't use them
>>> before the corresponding drivers are properly fixed. First of all DW APB
>>> Timer shouldn't be bound to a single CPU, since as being accessible over
>>> APB they are external with respect to all possible CPUs. Secondly there
>>> might be more than just two DW APB Timers in the system (Baikal-T1 has
>>> three of them), so permit the driver to use one of them as a clocksource
>>> and the rest - for clockevents. Thirdly it's possible to use MIPS GIC
>>> timer as a clocksource so register it in the corresponding subsystem
>>> (the patch has been found in the Paul Burton MIPS repo so I left the
>>> original Signed-off-by attribute). Finally in the same way as r4k timer
>>> the MIPS GIC timer should be used with care when CPUFREQ config is enabled
>>> since in case of CM2 the timer counting depends on the CPU reference clock
>>> frequency while the clocksource subsystem currently doesn't support the
>>> timers with non-stable clock.
>>>
>>> This patchset is rebased and tested on the mainline Linux kernel 5.7-rc4:
>>> base-commit: 0e698dfa2822 ("Linux 5.7-rc4")
>>> tag: v5.7-rc4
>>
>> Applied patch 1,2,4,5,6,7,8
>>
>> Thanks!
> 
> Great! Thanks. Am I right to expect the series in: git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git
> at the branch timers/core?

The series first goes to:

https://git.linaro.org/people/daniel.lezcano/linux.git/log/?h=timers/drivers/next

, then I send the PR to Thomas, who send in turn a PR at the merge
windows to Linus for the entire tip tree.


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