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+What: /sys/bus/spi/drivers/spidev/new_id
+Date: March 2016
+Description:
+ This allows to load spidev at runtime. new_id file accepts bus
+ number and chip select in 'B.C' format.
+ e.g.
+ To load spidev1.1 at runtime:
+ $ echo 1.1 > /sys/bus/spi/drivers/spidev/new_id