XSPI_SSR_OFFSET
xspi->write_fn(0xffff, regs_base + XSPI_SSR_OFFSET);
xspi->write_fn(xspi->cs_inactive, xspi->regs + XSPI_SSR_OFFSET);
xspi->write_fn(cs, xspi->regs + XSPI_SSR_OFFSET);