linux-kernel - Re: [PATCH v21 01/13] clocksource: arm_arch_timer: introduce two functions to get the frequency from mmio and sysreg.

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Message-ID: <20170320104153.GA18585@leverpostej>
Date:   Mon, 20 Mar 2017 10:41:54 +0000
From:   Mark Rutland <mark.rutland@....com>
To:     Fu Wei <fu.wei@...aro.org>
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <marc.zyngier@....com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Sudeep Holla <sudeep.holla@....com>,
        Hanjun Guo <hanjun.guo@...aro.org>,
        linux-arm-kernel@...ts.infradead.org,
        Linaro ACPI Mailman List <linaro-acpi@...ts.linaro.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        rruigrok@...eaurora.org, "Abdulhamid, Harb" <harba@...eaurora.org>,
        Christopher Covington <cov@...eaurora.org>,
        Timur Tabi <timur@...eaurora.org>,
        G Gregory <graeme.gregory@...aro.org>,
        Al Stone <al.stone@...aro.org>, Jon Masters <jcm@...hat.com>,
        Wei Huang <wei@...hat.com>, Arnd Bergmann <arnd@...db.de>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>,
        Leo Duran <leo.duran@....com>,
        Wim Van Sebroeck <wim@...ana.be>,
        Guenter Roeck <linux@...ck-us.net>,
        linux-watchdog@...r.kernel.org, Tomasz Nowicki <tn@...ihalf.com>,
        Christoffer Dall <christoffer.dall@...aro.org>,
        Julien Grall <julien.grall@....com>
Subject: Re: [PATCH v21 01/13] clocksource: arm_arch_timer: introduce two
 functions to get the frequency from mmio and sysreg.

On Mon, Mar 20, 2017 at 05:43:29PM +0800, Fu Wei wrote:
> On 20 March 2017 at 15:36, Fu Wei <fu.wei@...aro.org> wrote:
> > On 18 March 2017 at 02:05, Mark Rutland <mark.rutland@....com> wrote:
> >> On Tue, Feb 07, 2017 at 02:50:03AM +0800, fu.wei@...aro.org wrote:

> >>> +static u32 arch_timer_get_mmio_freq(void __iomem *cntbase)
> >>> +{
> >>> +     /*
> >>> +      * Try to get the frequency from the CNTFRQ of timer frame registers.
> >>> +      * Note: please verify cntbase in caller.
> >>> +      */
> >>> +     return readl_relaxed(cntbase + CNTFRQ);
> >>> +}
> >>
> >> Wrapping the MMIO read makes sense if we're going to do this in more
> >> than one place, so I'm happy with this wrapper.
> >>
> >> If you can s/arch_timer_get_mmio_freq/arch_timer_get_cntfrq/, and drop
> >
> > sorry, May I guess that is
> > "s/arch_timer_get_mmio_freq/arch_timer_get_mmio_cntfrq/"
> > or
> > "s/arch_timer_get_mmio_freq/arch_timer_mem_get_cntfrq/"
> >
> > which one do you prefer? :-)
> 
> keeping using arch_timer_get_cntfrq();  for per-CPU arch timer, then
> 
> +static u32 arch_timer_mem_get_cntfrq(void __iomem *cntbase)
> +{
> +       return readl_relaxed(cntbase + CNTFRQ);
> +}
> +

That looks perfect to me.

Sorry for the confusion above!

Mark.