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[v3,4/6] clocksource: exynos_mct: Add arch_timer cooperation mode for ARM64

Message ID 20181017134159.9656-5-m.szyprowski@samsung.com
State Superseded
Headers show
Series [v3,1/6] clocksource: exynos_mct: Remove dead code | expand

Commit Message

Marek Szyprowski Oct. 17, 2018, 1:41 p.m. UTC 
To get ARM Architected Timers working on Samsung Exynos SoCs, one has to
first configure and enable Exynos Multi-Core Timer, because they both
share some common hardware blocks (global system counter). This patch
adds a mode of cooperation with arch_timer driver, so kernel can use
CP15 based timer interface via arch_timer driver, which is mandatory
on ARM64. In such mode MCT driver only enables its clocks and starts
global timer. Everything else will be handled by arch_timer driver.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>

---
 drivers/clocksource/exynos_mct.c | 9 +++++++++
 1 file changed, 9 insertions(+)

-- 
2.17.1
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Patch

diff --git a/drivers/clocksource/exynos_mct.c b/drivers/clocksource/exynos_mct.c
index 02ad55db390b..1b19a4f03929 100644
--- a/drivers/clocksource/exynos_mct.c
+++ b/drivers/clocksource/exynos_mct.c
@@ -606,6 +606,15 @@  static int __init mct_init_dt(struct device_node *np, unsigned int int_type)
 	if (ret)
 		return ret;
 
+	if (IS_ENABLED(CONFIG_ARM64) && IS_ENABLED(CONFIG_ARM_ARCH_TIMER)) {
+		struct device_node *np = of_find_compatible_node(NULL, NULL,
+							     "arm,armv8-timer");
+		if (np) {
+			of_node_put(np);
+			exynos4_mct_frc_start();
+			return 0;
+		}
+	}
 
 	ret = exynos4_timer_interrupts(np, int_type);
 	if (ret)