[riot-notifications] [RIOT-OS/RIOT] cpu/sam0_common: remove unneeded GCLK_SLOW setup in i2c driver (#10839)

Dylan Laduranty notifications at github.com
Tue Jan 22 09:42:48 CET 2019


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### Contribution description
This PR removes the SERCOMx_GLCK_SLOW clock setup from the I2C driver.
According to [SAML21](http://ww1.microchip.com/downloads/en/DeviceDoc/60001477A.pdf), [SAMD21](http://ww1.microchip.com/downloads/en/DeviceDoc/SAMD21-Family-DataSheet-DS40001882D.pdf) and [SAML10](http://ww1.microchip.com/downloads/en/DeviceDoc/SAM-L10L11%20Family-DataSheet%20-%20DS60001513B.pdf) datasheets, this clock is used for SMBus timeouts features but RIOT doesn't use them at all. 
Look for `GCLK_SERCOM_SLOW` within the datasheet for more information.
In addition, this clock should be feed with 32kHz clock source not xx MHz (which is the case now)
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### Testing procedure
Pick the SAM0 board you want, play with any I2C sensors.
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### Issues/PRs references
Found this while adding I2C support for SAML10/SAML11 in #10653 

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You can view, comment on, or merge this pull request online at:

  https://github.com/RIOT-OS/RIOT/pull/10839

-- Commit Summary --

  * cpu/sam0_common: remove unneeded GCLK_SLOW setup in i2c driver

-- File Changes --

    M cpu/sam0_common/periph/i2c.c (17)

-- Patch Links --

https://github.com/RIOT-OS/RIOT/pull/10839.patch
https://github.com/RIOT-OS/RIOT/pull/10839.diff

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