MCSPI_CONF_WL_SHIFT
wl = ((conf >> MCSPI_CONF_WL_SHIFT) & MCSPI_CONF_WL_MSK) + 1;
(8 - 1) << MCSPI_CONF_WL_SHIFT);
#define MCSPI_CONF_WL8BITS (7 << MCSPI_CONF_WL_SHIFT)