MX51_ECSPI_CTRL_BL_OFFSET
ctrl |= ((n_bits - 1) << MX51_ECSPI_CTRL_BL_OFFSET);
ctrl |= pre_bl << MX51_ECSPI_CTRL_BL_OFFSET;
ctrl |= pre_bl << MX51_ECSPI_CTRL_BL_OFFSET;
ctrl |= tail_bl << MX51_ECSPI_CTRL_BL_OFFSET;
<< MX51_ECSPI_CTRL_BL_OFFSET;
<< MX51_ECSPI_CTRL_BL_OFFSET;