CHIP_SELECT
qspi->base[CHIP_SELECT] = devm_ioremap_resource(dev, res);
if (IS_ERR(qspi->base[CHIP_SELECT]))
return PTR_ERR(qspi->base[CHIP_SELECT]);
if (cs >= 0 && qspi->base[CHIP_SELECT]) {
rd = bcm_qspi_read(qspi, CHIP_SELECT, 0);
bcm_qspi_write(qspi, CHIP_SELECT, 0, wr);