[PATCH 0/5] Improvements for atsam BSP and sc16is752 UART.

[Christian Mauderer]

These patches add various improvements for the atsam BSP and for the
sc16is752 SPI UART controller.

Regarding patch 1: Note that I have thought about an auto detection
instead of the option. But I had a board where something responded to
the oscillator so that I could initialize it despite the fact that no
crystall has been connected. So I think an auto detection would be
dangerous.

With kind regards

Christian Mauderer