RIOT/cpu/sam0_common
Benjamin Valentin b77afadb49 cpu/sam0_common/gpio: use explicit GCLK names
For consistency, use named GCLKs.

 - `SAM0_GCLK_32KHZ` will always be 2 for samd21
 - `SAM0_GCLK_MAIN` will always be 0

So no change in functionality, just makes the code easier to understand.
2020-02-21 14:25:43 +01:00
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