MCSPI_CONF_CLKG
conf = MCSPI_CONF_CLKG | clkdiv << MCSPI_CONF_CLK_SHIFT;
reg &= ~(MCSPI_CONF_CLKG | MCSPI_CONF_CLK_MSK << MCSPI_CONF_CLK_SHIFT);
if (conf & MCSPI_CONF_CLKG) {