[PATCHv3] clocksource: exynos_mct: Add the support for Exynos 64bit SoC

[Chanwoo Choi]

This patch adds the support for Exynos 64bit SoC. The delay_timer is only used
for Exynos 32bit SoC.

Cc: Daniel Lezcano <daniel.lezcano at linaro.org>
Cc: Thomas Gleixner <tglx at linutronix.de>
Cc: Kukjin Kim <kgene.kim at samsung.com>
Cc: Mark Rutland <mark.rutland at arm.com>
Signed-off-by: Chanwoo Choi <cw00.choi at samsung.com>
---
This patch set is tested on 64-bit Exynos SoC. I send only this patch from
following patchst[1].
[1] https://lkml.org/lkml/2014/12/2/134

Changes from v2:
- None
Changes from v1:
- Use CONFIG_ARM instead of CONFIG_ARM64

 drivers/clocksource/Kconfig      | 1 -
 drivers/clocksource/exynos_mct.c | 4 ++++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
index 9042060..27ef3fa 100644
--- a/drivers/clocksource/Kconfig
+++ b/drivers/clocksource/Kconfig
@@ -134,7 +134,6 @@ config CLKSRC_METAG_GENERIC
 
 config CLKSRC_EXYNOS_MCT
 	def_bool y if ARCH_EXYNOS
-	depends on !ARM64
 	help
 	  Support for Multi Core Timer controller on Exynos SoCs.
 
diff --git a/drivers/clocksource/exynos_mct.c b/drivers/clocksource/exynos_mct.c
index 9403061..b840ea1 100644
--- a/drivers/clocksource/exynos_mct.c
+++ b/drivers/clocksource/exynos_mct.c
@@ -223,6 +223,7 @@ static u64 notrace exynos4_read_sched_clock(void)
 	return exynos4_read_count_32();
 }
 
+#if defined(CONFIG_ARM)
 static struct delay_timer exynos4_delay_timer;
 
 static cycles_t exynos4_read_current_timer(void)
@@ -231,14 +232,17 @@ static cycles_t exynos4_read_current_timer(void)
 			 "cycles_t needs to move to 32-bit for ARM64 usage");
 	return exynos4_read_count_32();
 }
+#endif
 
 static void __init exynos4_clocksource_init(void)
 {
 	exynos4_mct_frc_start();
 
+#if defined(CONFIG_ARM)
 	exynos4_delay_timer.read_current_timer = &exynos4_read_current_timer;
 	exynos4_delay_timer.freq = clk_rate;
 	register_current_timer_delay(&exynos4_delay_timer);
+#endif
 
 	if (clocksource_register_hz(&mct_frc, clk_rate))
 		panic("%s: can't register clocksource\n", mct_frc.name);
-- 
1.8.5.5