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Commit f1a4c1f3 authored by Chanwoo Choi's avatar Chanwoo Choi Committed by Krzysztof Kozlowski
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clocksource: exynos_mct: Add the support for ARM64 



This patch allows building and compile-testing the driver also for
ARM64.  The delay_timer is only supported on ARMv7.

Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Kukjin Kim <kgene@kernel.org>
Cc: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: default avatarChanwoo Choi <cw00.choi@samsung.com>
Acked-by: default avatarDaniel Lezcano <daniel.lezcano@linaro.org>
[k.kozlowski: Adjusted commit msg]
Signed-off-by: default avatarKrzysztof Kozlowski <k.kozlowski@samsung.com>
parent 29b4817d

drivers/clocksource/Kconfig

+1 −1
Original line number Diff line number Diff line
@@ -351,7 +351,7 @@ config CLKSRC_METAG_GENERIC 


config CLKSRC_EXYNOS_MCT

	bool "Exynos multi core timer driver" if COMPILE_TEST

	depends on ARM

	depends on ARM || ARM64

	help

	  Support for Multi Core Timer controller on Exynos SoCs.

drivers/clocksource/exynos_mct.c

+4 −0
Original line number Diff line number Diff line
@@ -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 int __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);