Justin Hibbits bba2d2bd51 Add a helper function to get system reference clock
Many devices are clocked from the SoC's platform clock / 2.  Some device nodes
include their own clock-frequency property, while others are dependent on the
SoC's bus-frequency property instead.  To simplify, add a helper function to get
this clock.
2017-04-01 22:29:11 +00:00
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