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-rw-r--r--drivers/pwm/pwm-bcm2835.c10
1 files changed, 9 insertions, 1 deletions
diff --git a/drivers/pwm/pwm-bcm2835.c b/drivers/pwm/pwm-bcm2835.c
index 174cca92f690..31a6992a445c 100644
--- a/drivers/pwm/pwm-bcm2835.c
+++ b/drivers/pwm/pwm-bcm2835.c
@@ -65,7 +65,15 @@ static int bcm2835_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
int duty_ns, int period_ns)
{
struct bcm2835_pwm *pc = to_bcm2835_pwm(chip);
- unsigned long scaler = NSEC_PER_SEC / clk_get_rate(pc->clk);
+ unsigned long rate = clk_get_rate(pc->clk);
+ unsigned long scaler;
+
+ if (!rate) {
+ dev_err(pc->dev, "failed to get clock rate\n");
+ return -EINVAL;
+ }
+
+ scaler = NSEC_PER_SEC / rate;
if (period_ns <= MIN_PERIOD) {
dev_err(pc->dev, "period %d not supported, minimum %d\n",