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ARM: convert arm/arm64 arch timer to use CLKSRC_OF init

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This converts arm and arm64 to use CLKSRC_OF DT based initialization for
the arch timer. A new function arch_timer_arch_init is added to allow for
arch specific setup.

This has a side effect of enabling sched_clock on omap5 and exynos5. There
should not be any reason not to use the arch timers for sched_clock.

Signed-off-by: Rob Herring <rob.herring@calxeda.com>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Kukjin Kim <kgene.kim@samsung.com>
Cc: Tony Lindgren <tony@atomide.com>
Cc: Simon Horman <horms@verge.net.au>
Cc: Magnus Damm <magnus.damm@gmail.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: John Stultz <john.stultz@linaro.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-samsung-soc@vger.kernel.org
Cc: linux-omap@vger.kernel.org
Cc: linux-sh@vger.kernel.org
Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
This commit is contained in:
Rob Herring
2013-04-10 18:27:51 -05:00
parent f414f13f2f
commit 0583fe478a
19 changed files with 29 additions and 87 deletions
Download Patch File Download Diff File Expand all files Collapse all files

17
arch/arm/kernel/arch_timer.c
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@@ -39,26 +39,15 @@ static void __init arch_timer_delay_timer_register(void)
register_current_timer_delay(&arch_delay_timer);
}
int __init arch_timer_of_register(void)
{
int ret;
ret = arch_timer_init();
if (ret)
return ret;
arch_timer_delay_timer_register();
return 0;
}
int __init arch_timer_sched_clock_init(void)
int __init arch_timer_arch_init(void)
{
u32 arch_timer_rate = arch_timer_get_rate();
if (arch_timer_rate == 0)
return -ENXIO;
arch_timer_delay_timer_register();
/* Cache the sched_clock multiplier to save a divide in the hot path. */
sched_clock_mult = NSEC_PER_SEC / arch_timer_rate;
sched_clock_func = arch_timer_sched_clock;