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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

1
drivers/clocksource/Kconfig
View File

@@ -62,6 +62,7 @@ config CLKSRC_DBX500_PRCMU_SCHED_CLOCK
config ARM_ARCH_TIMER
bool
select CLKSRC_OF if OF
config CLKSRC_METAG_GENERIC
def_bool y if METAG

23
drivers/clocksource/arm_arch_timer.c
View File

@@ -337,22 +337,14 @@ out:
return err;
}
static const struct of_device_id arch_timer_of_match[] __initconst = {
{ .compatible = "arm,armv7-timer", },
{ .compatible = "arm,armv8-timer", },
{},
};
int __init arch_timer_init(void)
static void __init arch_timer_init(struct device_node *np)
{
struct device_node *np;
u32 freq;
int i;
np = of_find_matching_node(NULL, arch_timer_of_match);
if (!np) {
pr_err("arch_timer: can't find DT node\n");
return -ENODEV;
if (arch_timer_get_rate()) {
pr_warn("arch_timer: multiple nodes in dt, skipping\n");
return;
}
/* Try to determine the frequency from the device tree or CNTFRQ */
@@ -378,7 +370,7 @@ int __init arch_timer_init(void)
if (!arch_timer_ppi[PHYS_SECURE_PPI] ||
!arch_timer_ppi[PHYS_NONSECURE_PPI]) {
pr_warn("arch_timer: No interrupt available, giving up\n");
return -EINVAL;
return;
}
}
@@ -387,5 +379,8 @@ int __init arch_timer_init(void)
else
arch_timer_read_counter = arch_counter_get_cntpct;
return arch_timer_register();
arch_timer_register();
arch_timer_arch_init();
}
CLOCKSOURCE_OF_DECLARE(armv7_arch_timer, "arm,armv7-timer", arch_timer_init);
CLOCKSOURCE_OF_DECLARE(armv8_arch_timer, "arm,armv8-timer", arch_timer_init);