cp210x_write_reg_block
ret = cp210x_write_reg_block(port, CP210X_SET_CHARS, &chars,
ret = cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
ret = cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val));