Hi, Petro,
I'm currently working on adding SPI driver for AM335X. The MCSPI controller of AM335X supports the transfer of up to 32-bits long SPI words. Currently, SPI driver in Nuttx supports up to 16-bits long words transfer. The attached patch extends it to 32-bit long words.
I am not comfortable about reviewing and incorporating such an extensive change without benefit of help with the review. Can you possibly submit this as a PR to the Github apached/incubator_nuttx repository. I think that would work out better.
Greg