Add support for Andes Qilai SoC PCIe controller

These patches introduce driver support for the PCIe controller on the
Andes Qilai SoC.

Signed-off-by: Randolph Lin <randolph@andestech.com>

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Changes in v6:
- Fix typo in the logic for adjusting the number of OB/IB windows

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Changes in v5:
- Add support to adjust the number of OB/IB windows in the glue driver.
- Fix the number of OB windows in the Qilai PCIe driver.
- Remove meaningless properties from the device tree.
- Made minor adjustments based on the reviewer's suggestions.

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Changes in v4:
- Add .post_init callback for enabling IOCP cache.  
- Sort by vender name in Kconfig 
- Using PROBE_PREFER_ASYNCHRONOUS as default probe type.
- Made minor adjustments based on the reviewer's suggestions.

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Changes in v3:
- Remove outbound ATU address range validation callback and logic.
- Add logic to skip failed outbound iATU configuration and continue.
- Using PROBE_PREFER_ASYNCHRONOUS as default probe type.
- Made minor adjustments based on the reviewer's suggestions.

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Changes in v2:
- Remove the patch that adds the dma-ranges property to the SoC node.
- Add dma-ranges to the PCIe parent node bus node.
- Refactor and rename outbound ATU address range validation callback and logic.
- Use parent_bus_offset instead of cpu_addr_fixup().
- Using PROBE_DEFAULT_STRATEGY as default probe type.
- Made minor adjustments based on the reviewer's suggestions.

Randolph Lin (5):
  PCI: dwc: Allow adjusting the number of ob/ib windows in glue driver
  dt-bindings: PCI: Add Andes QiLai PCIe support
  riscv: dts: andes: Add PCIe node into the QiLai SoC
  PCI: andes: Add Andes QiLai SoC PCIe host driver support
  MAINTAINERS: Add maintainers for Andes QiLai PCIe driver

 .../bindings/pci/andestech,qilai-pcie.yaml    |  97 +++++++
 MAINTAINERS                                   |   7 +
 arch/riscv/boot/dts/andes/qilai.dtsi          | 106 ++++++++
 drivers/pci/controller/dwc/Kconfig            |  13 +
 drivers/pci/controller/dwc/Makefile           |   1 +
 drivers/pci/controller/dwc/pcie-andes-qilai.c | 240 ++++++++++++++++++
 drivers/pci/controller/dwc/pcie-designware.c  |  12 +-
 7 files changed, 474 insertions(+), 2 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/pci/andestech,qilai-pcie.yaml
 create mode 100644 drivers/pci/controller/dwc/pcie-andes-qilai.c

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2.34.1