linux-kernel - Re: [PATCH] timekeeping: Move persistent clock registration code from ARM to kernel

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Message-ID: <CAOMFOmXpAm5iKCLFyorTW+n9YmgZMmrDGGe736tJX8C6BYQv-A@mail.gmail.com>
Date:	Mon, 10 Nov 2014 11:26:20 -0800
From:	Anatol Pomozov <anatol.pomozov@...il.com>
To:	Thierry Reding <thierry.reding@...il.com>
Cc:	Stephen Warren <swarren@...dotorg.org>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	linux@....linux.org.uk, "tglx@...utronix.de" <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	Tony Lindgren <tony@...mide.com>,
	Mark Rutland <mark.rutland@....com>
Subject: Re: [PATCH] timekeeping: Move persistent clock registration code from
 ARM to kernel

Hi

On Mon, Nov 10, 2014 at 1:53 AM, Thierry Reding
<thierry.reding@...il.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.

In fact none of arch/arm/lib/delay.c code seems ARM32 related.
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