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-rw-r--r--drivers/pwm/pwm-bcm2835.c9
1 files changed, 5 insertions, 4 deletions
diff --git a/drivers/pwm/pwm-bcm2835.c b/drivers/pwm/pwm-bcm2835.c
index 52763063c100..2c82386c0ebf 100644
--- a/drivers/pwm/pwm-bcm2835.c
+++ b/drivers/pwm/pwm-bcm2835.c
@@ -21,7 +21,7 @@
#define PERIOD(x) (((x) * 0x10) + 0x10)
#define DUTY(x) (((x) * 0x10) + 0x14)
-#define MIN_PERIOD 108 /* 9.2 MHz max. PWM clock */
+#define PERIOD_MIN 0x2
struct bcm2835_pwm {
struct pwm_chip chip;
@@ -64,6 +64,7 @@ static int bcm2835_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
struct bcm2835_pwm *pc = to_bcm2835_pwm(chip);
unsigned long rate = clk_get_rate(pc->clk);
unsigned long scaler;
+ u32 period;
if (!rate) {
dev_err(pc->dev, "failed to get clock rate\n");
@@ -71,14 +72,14 @@ static int bcm2835_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
}
scaler = DIV_ROUND_CLOSEST(NSEC_PER_SEC, rate);
+ period = DIV_ROUND_CLOSEST(period_ns, scaler);
- if (period_ns <= MIN_PERIOD)
+ if (period < PERIOD_MIN)
return -EINVAL;
writel(DIV_ROUND_CLOSEST(duty_ns, scaler),
pc->base + DUTY(pwm->hwpwm));
- writel(DIV_ROUND_CLOSEST(period_ns, scaler),
- pc->base + PERIOD(pwm->hwpwm));
+ writel(period, pc->base + PERIOD(pwm->hwpwm));
return 0;
}