SPI bits per word increase from 16

Hi, I’m new to programming the BBB and am trying to transfer 32 bits per word using the SPI interface. I notice that the source code in adafruit bbio’s spimodule.c limits bpw range as 8 to 16 bits. Would it be possible to increase this to 32? How can this be done? Any help is much appreciated. Many thanks in advance!