avg
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aw_pwm: add a check and some comments related to long periods ...
The hardware supports periods as long as 196 seconds[*] when using the
maximal prescaling of 72000 and maximum cycle count of 2^16.
But the code becomes incorrect when the period length approaches 1 second.
That's because of things like NS_PER_SEC / period.
[*] At the same time I must note that the KPI provides for maximum
period of about 4 seconds (2^32 nanoseconds).
MFC after: 2 weeks
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