Re: [PATCH v5 2/4] clocksource: stm32: only use 32 bits timers

16 bits hardware are not enough accure to be used.
Do no allow them to be probed by tested max counter value.

Signed-off-by: Benjamin Gaignard <redacted>
---
  drivers/clocksource/timer-stm32.c | 23 +++++++++--------------
  1 file changed, 9 insertions(+), 14 deletions(-)

diff --git a/drivers/clocksource/timer-stm32.c b/drivers/clocksource/timer-stm32.c
index abff21c..f7e4eec 100644
--- a/drivers/clocksource/timer-stm32.c
+++ b/drivers/clocksource/timer-stm32.c

@@ -81,9 +81,9 @@ static irqreturn_t stm32_clock_event_handler(int irq, void *dev_id)
  static int __init stm32_clockevent_init(struct device_node *node)
  {
  	struct reset_control *rstc;
-	unsigned long max_delta;
-	int ret, bits, prescaler = 1;
+	unsigned long max_arr;
  	struct timer_of *to;
+	int ret;
  
  	to = kzalloc(sizeof(*to), GFP_KERNEL);
  	if (!to)

@@ -113,26 +113,21 @@ static int __init stm32_clockevent_init(struct device_node *node)
  
  	/* Detect whether the timer is 16 or 32 bits */
  	writel_relaxed(~0U, timer_of_base(to) + TIM_ARR);
-	max_delta = readl_relaxed(timer_of_base(to) + TIM_ARR);
-	if (max_delta == ~0U) {
-		prescaler = 1;
-		bits = 32;
-	} else {
-		prescaler = 1024;
-		bits = 16;
+	max_arr = readl_relaxed(timer_of_base(to) + TIM_ARR);
+	if (max_arr != ~0U) {
+		pr_err("32 bits timer is needed\n");
+		return -EINVAL;