clocksource/drivers/timer-atmel-pit: Enable mck clock

mck is needed to get the PIT working. Explicitly prepare_enable it instead of assuming it is enabled. This solves an issue where the system is freezing when the ETM/ETB drivers are enabled. Reported-by: Olivier Schonken <[email protected]> Reviewed-by: Boris Brezillon <[email protected]> Acked-by: Nicolas Ferre <[email protected]> Signed-off-by: Alexandre Belloni <[email protected]> Signed-off-by: Daniel Lezcano <[email protected]>
ambv · Aug 26, 2016 · 699e36e · 699e36e
1 parent aa8c0f1
commit 699e36e
Showing 1 changed file with 6 additions and 0 deletions.
diff --git a/drivers/clocksource/timer-atmel-pit.c b/drivers/clocksource/timer-atmel-pit.c
@@ -261,6 +261,12 @@ static int __init at91sam926x_pit_dt_init(struct device_node *node)
 		return PTR_ERR(data->mck);
 	}
 
+	ret = clk_prepare_enable(data->mck);
+	if (ret) {
+		pr_err("Unable to enable mck\n");
+		return ret;
+	}
+
 	/* Get the interrupts property */
 	data->irq = irq_of_parse_and_map(node, 0);
 	if (!data->irq) {