Current driver is supports up to 16 buses. The following code fixes to support up to 256 buses. update "NWL_ECAM_VALUE_DEFAULT " to 16 can access up to 256MB ECAM region to detect 256 buses. Remove redundant code which updates primary,secondary and sub-ordinate register offset 0x18 in type1 header. Update ecam size to 256MB in device tree binding example. Thippeswamy Havalige (2): PCI: xilinx-nwl: Update ECAM default value and remove unnecessary code. dt-bindings: PCI: xilinx-nwl: Modify ECAM size in example. .../devicetree/bindings/pci/xlnx,nwl-pcie.yaml | 2 +- drivers/pci/controller/pcie-xilinx-nwl.c | 18 +++--------------- 2 files changed, 4 insertions(+), 16 deletions(-) -- 1.8.3.1