USART peripheral can work in SPI mode as well. This commit adds support
for such functionality. Only 1 slave device is supported by the
peripheral therefore board level does not have to ensure correct CS
setup.
The usage of the peripheral is the same as with other SPI drivers.
Signed-off-by: Michal Lenc <michallenc@seznam.cz>
- migrated /README are removed from /boards
- there are a lot of READMEs that should be further converted to rst.
At the moment they are moved to Documentation/platforms and included in rst files
Initial documentation page for SAMv7 MCU is added. There are still
board pages to be added in the future.
Signed-off-by: Michal Lenc <michallenc@seznam.cz>
