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| author | Fabrice Gasnier <fabrice.gasnier@st.com> | 2019-09-18 16:54:21 +0200 |
|---|---|---|
| committer | Thierry Reding <thierry.reding@gmail.com> | 2019-09-21 03:25:10 +0200 |
| commit | c91e3234c6035baf5a79763cb4fcd5d23ce75c2b (patch) | |
| tree | ff657840c6b1869f809e4d2b5afc5b7bbeee93bf /drivers/mfd/altera-a10sr.c | |
| parent | pwm: Ensure pwm_apply_state() doesn't modify the state argument (diff) | |
| download | linux-c91e3234c6035baf5a79763cb4fcd5d23ce75c2b.tar.xz linux-c91e3234c6035baf5a79763cb4fcd5d23ce75c2b.zip | |
pwm: stm32-lp: Add check in case requested period cannot be achieved
LPTimer can use a 32KHz clock for counting. It depends on clock tree
configuration. In such a case, PWM output frequency range is limited.
Although unlikely, nothing prevents user from requesting a PWM frequency
above counting clock (32KHz for instance):
- This causes (prd - 1) = 0xffff to be written in ARR register later in
the apply() routine.
This results in badly configured PWM period (and also duty_cycle).
Add a check to report an error is such a case.
Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Reviewed-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
Diffstat (limited to 'drivers/mfd/altera-a10sr.c')
0 files changed, 0 insertions, 0 deletions