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pwm: fsl-ftm: Handle clk_get_rate() returning 0

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Considering that the driver doesn't enable the used clocks (and also
that clk_get_rate() returns 0 if CONFIG_HAVE_CLK is unset) better check
the return value of clk_get_rate() for being non-zero before dividing by
it.

Fixes: 3479bbd1e1 ("pwm: fsl-ftm: More relaxed permissions for updating period")
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com>
Link: https://lore.kernel.org/r/b68351a51017035651bc62ad3146afcb706874f0.1743501688.git.u.kleine-koenig@baylibre.com
Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>
This commit is contained in:
Uwe Kleine-König
2025-04-01 12:29:01 +02:00
committed by Uwe Kleine-König
parent e7327c1930
commit 928446a530
1 changed files with 6 additions and 0 deletions
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6
drivers/pwm/pwm-fsl-ftm.c
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@@ -118,6 +118,9 @@ static unsigned int fsl_pwm_ticks_to_ns(struct fsl_pwm_chip *fpc,
unsigned long long exval;
rate = clk_get_rate(fpc->clk[fpc->period.clk_select]);
if (rate >> fpc->period.clk_ps == 0)
return 0;
exval = ticks;
exval *= 1000000000UL;
do_div(exval, rate >> fpc->period.clk_ps);
@@ -190,6 +193,9 @@ static unsigned int fsl_pwm_calculate_duty(struct fsl_pwm_chip *fpc,
unsigned int period = fpc->period.mod_period + 1;
unsigned int period_ns = fsl_pwm_ticks_to_ns(fpc, period);
if (!period_ns)
return 0;
duty = (unsigned long long)duty_ns * period;
do_div(duty, period_ns);