PCI_PTP_BAR_NO
clock->reg_base = pcim_iomap_region(pdev, PCI_PTP_BAR_NO, pci_name(pdev));
pcim_iounmap_region(pdev, PCI_PTP_BAR_NO);
err = pcim_iomap_regions(pdev, 1 << PCI_PTP_BAR_NO, pci_name(pdev));
ptp->reg_base = pcim_iomap_table(pdev)[PCI_PTP_BAR_NO];