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 19:02:24 +0300
From:   Serge Semin <Sergey.Semin@...kalelectronics.ru>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>
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 Fri, May 22, 2020 at 05:44:55PM +0200, Daniel Lezcano wrote:
> 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.

Ok. Thanks for clarification.

-Sergey

> 
> 
> -- 
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