K 10
svn:author
V 3
avg
K 8
svn:date
V 27
2020-09-25T07:41:51.568263Z
K 7
svn:log
V 456
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

END