[PATCH] clockevents: timer-stm32: Fix build warning spotted by kbuild test robot

[Maxime Coquelin <mcoquelin.stm32@gmail.com>]

This patch fixes below warning spotted by kbuild test robot when building
with ARCH=powerpc:

   drivers/clocksource/timer-stm32.c: In function 'stm32_clockevent_init':
>> drivers/clocksource/timer-stm32.c:140:9: warning: large integer implicitly truncated to unsigned type [-Woverflow]
     writel_relaxed(~0UL, data->base + TIM_ARR);

The fix consists in casting the value to u32.

Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Maxime Coquelin <mcoquelin.stm32@gmail.com>
---
 drivers/clocksource/timer-stm32.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/clocksource/timer-stm32.c b/drivers/clocksource/timer-stm32.c
index fad2e2e..c9578d8 100644
--- a/drivers/clocksource/timer-stm32.c
+++ b/drivers/clocksource/timer-stm32.c
@@ -137,7 +137,7 @@ static void __init stm32_clockevent_init(struct device_node *np)
 	}
 
 	/* Detect whether the timer is 16 or 32 bits */
-	writel_relaxed(~0UL, data->base + TIM_ARR);
+	writel_relaxed((u32)~0UL, data->base + TIM_ARR);
 	max_delta = readl_relaxed(data->base + TIM_ARR);
 	if (max_delta == ~0UL) {
 		prescaler = 1;
-- 
1.9.1