Date: Sat, 15 Nov 2014 01:18:57 +0100 (CET)
From: Thomas Gleixner <tglx@linutronix.de>
To: Anatol Pomozov <anatol.pomozov@gmail.com>
cc: Thierry Reding <thierry.reding@gmail.com>,
        Stephen Warren <swarren@wwwdotorg.org>,
        Daniel Lezcano <daniel.lezcano@linaro.org>,
        Russell King <linux@arm.linux.org.uk>,
        LKML <linux-kernel@vger.kernel.org>,
        "linux-tegra@vger.kernel.org" <linux-tegra@vger.kernel.org>,
        Tony Lindgren <tony@atomide.com>, Mark Rutland <mark.rutland@arm.com>,
        John Stultz <john.stultz@linaro.org>
Subject: Re: [PATCH] timekeeping: Move persistent clock registration code
 from ARM to kernel
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References: <1415388855-35074-1-git-send-email-anatol.pomozov@gmail.com> <20141110095325.GC12126@ulmo> <CAOMFOmXpAm5iKCLFyorTW+n9YmgZMmrDGGe736tJX8C6BYQv-A@mail.gmail.com> <alpine.DEB.2.11.1411132334400.3935@nanos>
 <CAOMFOmVziftM=pWGG-L9J-E6AHYAK7k9bmBcpS1adPboLciX9g@mail.gmail.com>
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On Fri, 14 Nov 2014, Anatol Pomozov wrote:
> On Thu, Nov 13, 2014 at 2:46 PM, Thomas Gleixner <tglx@linutronix.de> wrote:
> > On Mon, 10 Nov 2014, Anatol Pomozov wrote:
> >> On Mon, Nov 10, 2014 at 1:53 AM, Thierry Reding
> >> <thierry.reding@gmail.com> wrote:
> >> > On Fri, Nov 07, 2014 at 11:34:15AM -0800, Anatol Pomozov wrote:
> >> >> ARM timekeeping functionality allows to register persistent/boot clock dynamically.
> >> >> This code is arch-independent and can be useful on other plaforms as well.
> >> >>
> >> >> As a byproduct of this change, tegra20_timer becomes ARM64 compatible.
> >> >>
> >> >> Tested: backported the change to chromeos-3.14 kernel ran on tegra 64bit
> >> >> board, made sure high-resolution clock works.
> >> >
> >> > Using this on an upstream kernel doesn't work, though, because 64-bit
> >> > ARM doesn't implement struct delay_timer which the driver needs since
> >> > v3.17.
> >> >
> >> > But I suppose the delay timer infrastructure could be moved into the
> >> > core similar to the persistent and boot clock as this patch does.
> >>
> >> Thanks. It makes sense, I will send it in a separate patch, once this
> >> one will be reviewed. On our kernel I haven't seen this issue as we
> >> still use 3.14.
> >
> > That's why you should test/compile your stuff on latest greatest and
> > not on a year old conglomorate of unknown provenance. :)
> 
> Unfortunately it is not possible to test this patch with upstream.
> There is no ARM64 bit support for Tegra yet. I am trying to
> cleanup/upstream my ChromeOS patches and this clock patch in
> particular makes one small step towards this goal. Also Thierry
> mentioned that he works on full ARM64 Tegra support and it is really
> exciting!

Everything is exciting, but it does not change the fact, that this
patch cannot work on current upstream.

> So what I suppose to do with my patch? If it does not work could
> anyone provide patch that removes ARM arch dependency from
> tegra20_timer.c?

Huch? You want other people to solve your problems?

Thanks,

	tglx
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