Kevin O'Connor da68da7a63 atsamd: Add support for reference clock selection to SAMD21
Add support for using the internal clocks (with USB clock recovery
mode if available) on the SAMD21.  Don't use the internal clock if the
external crystal is requested (instead use the PLL synced to the
external 32Khz signal).

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
2019-02-22 09:07:26 -05:00
..
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