[riot-notifications] [RIOT-OS/RIOT] cpu/sam0: optimizations to the shared UART driver (#7556)

Hauke Petersen notifications at github.com
Mon Sep 4 11:27:37 CEST 2017

> Why do you call uart_poweron at different places ?

Normally, it should be called in the beginning of the init function for all famlilies, but when testing it, I found that this did not work for the `saml21` with the current `poweron()` function. But as I had no time to look into the specific clock configuration code for that CPU, I simply left the position of the poweron where it had been before - at leat this works for now. Feel free to debug :-)

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