[riot-notifications] [RIOT-OS/RIOT] stm32-common/spi: allow custom pin modes on spi to minimize power consumption (#11542)

Alexandre Abadie notifications at github.com
Mon May 20 18:05:05 CEST 2019

@fjmolinas, I extended the SPI interface with a new function `spi_init_gpio_mode()` (better suggestion welcome) and let the driver manage the right gpio mode directly. It should still work.
Unfortunately, with the current approach, boards still have to explicitly provide `periph_spi_gpio_mode`. The change is transparent for boards that doesn't expose this. Only nucleo-l151re provides this but we should adapt all LoRa capable boards if we keep things this way.

Let me know what you think of the current strategy.

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