ESPI_SPMODE
loop_mode = fsl_espi_read_reg(espi, ESPI_SPMODE);
fsl_espi_write_reg(espi, ESPI_SPMODE, loop_mode);
regval = fsl_espi_read_reg(espi, ESPI_SPMODE);
fsl_espi_write_reg(espi, ESPI_SPMODE, regval);
regval = fsl_espi_read_reg(espi, ESPI_SPMODE);
fsl_espi_write_reg(espi, ESPI_SPMODE, regval);
fsl_espi_write_reg(espi, ESPI_SPMODE, 0);
fsl_espi_write_reg(espi, ESPI_SPMODE, SPMODE_INIT_VAL | SPMODE_ENABLE);