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atsamd: Update SAMD51 clock configuration

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Add support for USB clock recovery mode if an external 32Khz crystal
is not in use.  If using an external crystal, then don't use the
internal 48Mhz DFLL48Mhz clock (just use the PLLs synced to the
external 32Khz signal).

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor
2019-02-14 18:16:48 -05:00
parent 7a32860455
commit d452a1de48
2 changed files with 64 additions and 41 deletions
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4
src/atsamd/Kconfig
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@@ -56,10 +56,10 @@ config CLOCK_FREQ
choice
depends on MACH_SAMD51
prompt "Clock Reference"
config CLOCK_REF_INTERNAL
bool "Internal clock"
config CLOCK_REF_X32K
bool "32.768Khz crystal"
config CLOCK_REF_INTERNAL
bool "Factory calibration"
endchoice
choice