GPIO_BAR
ret = pcim_iomap_regions(pdev, 1 << GPIO_BAR, DRV_NAME);
dev_err(&pdev->dev, "can't alloc PCI BAR #%d\n", GPIO_BAR);
sd->gpio_pub_base = pcim_iomap_table(pdev)[GPIO_BAR];
.resources = &cs5535_mfd_resources[GPIO_BAR],