This is a high resolution PWM driver, utilizing one 16-bit Flex-IO timer for
generating PWM period and the rest of the timers to generate PWM duty cycles.
This means that the period has to be the same for every PWM generated from one
FLEXIO block, but this way we can get 16-bit resolution for the PWM signals.
For a typical IMX9 HW there are 8 timers for each Flex-IO block, which means
that by using this driver one can get 7 PWM outputs from one block.
This driver can be later extended to have configuration options to use all
8 channels per flex-io by either using 8+8 -bit timer (less resolution) or by
using an external trigger from an LPIT.
Signed-off-by: Jukka Laitinen <jukkax@ssrc.tii.ae>
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