will implement something like that in U-Boot too as follow:
1) Add the bits_per_word in the spi_slave struct
2) at the dw_spi_xfer function to resolve for the slave->bits_per_word value and store into the priv->bits_per_word, default to 8 otherwise


Submitted the change at:
https://patchwork.ozlabs.org/project/uboot/patch/[email protected]/

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