On 11/21/2015 09:59 PM, Soren Brinkmann wrote:

The startup function is supposed to initialize the UART for receiving.
Hence, don't enable the TX part. Also, protect HW accesses with the port
lock.

Reviewed-by: Peter Hurley <redacted>

NB: the request_irq() should be _after_ h/w programming, otherwise an
interrupt could be triggered and in-progress before the h/w has been
setup.