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-rw-r--r--drivers/pwm/pwm-mxs.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/pwm/pwm-mxs.c b/drivers/pwm/pwm-mxs.c
index f75ecb09d97d..b430811e14f5 100644
--- a/drivers/pwm/pwm-mxs.c
+++ b/drivers/pwm/pwm-mxs.c
@@ -35,6 +35,10 @@
#define PERIOD_CDIV(div) (((div) & 0x7) << 20)
#define PERIOD_CDIV_MAX 8
+static const unsigned int cdiv[PERIOD_CDIV_MAX] = {
+ 1, 2, 4, 8, 16, 64, 256, 1024
+};
+
struct mxs_pwm_chip {
struct pwm_chip chip;
struct clk *clk;
@@ -54,13 +58,13 @@ static int mxs_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
rate = clk_get_rate(mxs->clk);
while (1) {
- c = rate / (1 << div);
+ c = rate / cdiv[div];
c = c * period_ns;
do_div(c, 1000000000);
if (c < PERIOD_PERIOD_MAX)
break;
div++;
- if (div > PERIOD_CDIV_MAX)
+ if (div >= PERIOD_CDIV_MAX)
return -EINVAL;
}