usb: dwc3: Calculate REFCLKPER based on reference clock

Instead of using a special property to determine the reference clock
period, use the rate of the reference clock. When we have a legacy
snps,ref-clock-period-ns property and no reference clock, use it
instead. Fractional clocks are not currently supported, and will be
dealt with in the next commit.

[ marek: Ported from Linux kernel commit
         5114c3ee24875 ("usb: dwc3: Calculate REFCLKPER based on reference clock") ]

Reviewed-by: Sean Anderson <[email protected]>
Signed-off-by: Sean Anderson <[email protected]>
Signed-off-by: Marek Vasut <[email protected]> # Port from Linux

0 files changed, 0 insertions, 0 deletions