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

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 <[email protected]>
Cc: Russell King <[email protected]>
Cc: Kukjin Kim <[email protected]>
Cc: Tony Lindgren <[email protected]>
Cc: Simon Horman <[email protected]>
Cc: Magnus Damm <[email protected]>
Cc: Catalin Marinas <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: John Stultz <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Acked-by: Santosh Shilimkar <[email protected]>

1 files changed, 3 insertions, 14 deletions

diff --git a/arch/arm/kernel/arch_timer.c b/arch/arm/kernel/arch_timer.c
index 80c458fc4a30..59dcdced6e30 100644
--- a/arch/arm/kernel/arch_timer.c
+++ b/arch/arm/kernel/arch_timer.c
@@ -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;