It takes 11 CPU ticks to recalculate ctr and cxcprs at the same frequency.
The previously calculated ctr and cxcprs can be stored at the same
frequency without recalculation.
Signed-off-by: Tim Lin <tim2.lin@ite.corp-partner.google.com>
When pwm_it8xxx2_set_cycles() is called, we disable the pwm clock
at the beginning and enable it at the end, so there is a more than
1ms pwm low pulse when every time changing the cycle. The low pulse
would let some fans go to idle mode, so we don't gate the pwm clock.
Signed-off-by: Ruibin Chang <Ruibin.Chang@ite.com.tw>
Make sure cxcprs isn't zero, or we will have
divide-by-zero on calculating actual_freq.
Test:
1.tests/drivers/pwm/pwm_api pattern
2.GPA0(pwm0) output 79201Hz, 324Hz, 100Hz, 1Hz waveform
Signed-off-by: Ruibin Chang <Ruibin.Chang@ite.com.tw>
In order to bring consistency in-tree, migrate all drivers to the new
prefix <zephyr/...>. Note that the conversion has been scripted, refer
to #45388 for more details.
Signed-off-by: Gerard Marull-Paretas <gerard.marull@nordicsemi.no>
The variable indicating the PWM channel is now names "channel" instead
of "pwm", adjust all drivers.
Signed-off-by: Gerard Marull-Paretas <gerard.marull@nordicsemi.no>
Multiple if/else blocks had missing braces, add them as this violates
Zephyr coding guidelines.
Signed-off-by: Gerard Marull-Paretas <gerard.marull@nordicsemi.no>
The API call checks for this condition before calling the pin_set driver
OP call, so drivers don't have to do this check now.
Signed-off-by: Gerard Marull-Paretas <gerard.marull@nordicsemi.no>
Add pwm-0 to support tests/drivers/pwm/pwm_api.
Solve tests code runtime error on it8xxx2_evb:
1.If the pwm channel target frequency is < 1, then we will
return an error code.
2.If the target_freq is <= 324Hz, we will configure that this pwm
channel need to output in EC power saving mode.
In test_pwm_cycle() case, the period is 64000, then the
target_freq is 8000000 / 64000 = 125Hz and <= 324Hz, so we will
switch the prescaler clock source from 8MHz to 32.768kHz.
Then the target_freq is 32768 / 64000 = 0.512Hz and < 1Hz,
this will return an error code. In order to get the same
target_freq, we always return PWM_FREQ in
pwm_it8xxx2_get_cycles_per_sec().
Signed-off-by: Ruibin Chang <Ruibin.Chang@ite.com.tw>
1.Putting the PWM_CHANNEL_X, PWM_PRESCALER_CX information
in the description.
2.Use the common definition EC_FREQ.
3.Use the common macro IT8XXX2_DT_ALT_ITEMS_LIST.
4.Stop using DRV_CONFIG, DRV_REG macro.
Signed-off-by: Ruibin Chang <Ruibin.Chang@ite.com.tw>
