Add missing newline in help string. Signed-off-by: Liam Beguin <liambeguin@gmail.com>
Corrected copyright header. Signed-off-by: Nerijus Bendžiūnas <nerijus.bendziunas@astrolightspace.com>
Inspired by I2C shell. Useful during SPI device driver development or for debugging. Usage example (read JEDEC ID): ``` uart:~$ spi conf spi4 1000000 oh uart:~$ spi transceive 9f 00 00 00 TX: 00000000: 9f 00 00 00 |.... | RX: 00000000: 00 ef 40 19 |.... | ``` Signed-off-by: Nerijus Bendžiūnas <nerijus.bendziunas@astrolightspace.com>