Benjamin Valentin 91604d0217 cpu/samd21: clean up 'disabled GCLK' magic ... It turns out hooking up an unused peripheral to a disabled GCLK leads to surprising power savings. Name the GCLK to be more explicit (and since not all members of the extended samd2x family have a GCLK7). Turns out we can just use a non-existing GCLK ID for this, this even saves us a real GCLK that we can use for something else. Also make sure to disable *all* peripherals by using `GCLK_CLKCTRL_ID_Msk` instead of relying on a magic value. Looks like we previously missed some, since this leads to some additional power savings: master: 4.22 mA this patch: 4.09 mA		2020-10-02 23:16:52 +02:00
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periph_cpu.h	cpu/samd21: clean up 'disabled GCLK' magic	2020-10-02 23:16:52 +02:00