[v11,00/13] PCI: rcar-gen4: Add R-Car Gen4 PCIe support

Add R-Car S4-8 (R-Car Gen4) PCIe Host and Endpoint support.
To support them, modify PCIe DesignWare common codes.

Patch [1/12] and [2/12] are bug fix patches.

Changes from v10:
https://patchwork.kernel.org/project/linux-pci/cover/20230308082352.491561-1-yoshihiro.shimoda.uh@renesas.com/
 - Fix dt-bindings doc for endpoint (reported by Rob's bot).
 - Add reg and reg-names to the dt-bindings doc of host.
 - Fix examples in the dt-bindings docs of both host and endpoint.
 - Add R-Car S4-8 device ID into the pci_test_endpoint driver.

Changes from v9:
https://lore.kernel.org/linux-pci/20230210134917.2909314-1-yoshihiro.shimoda.uh@renesas.com/
 - Based on next-20230306
 - Add bug fix patches into this patch series.
   https://lore.kernel.org/linux-pci/20230216092012.3256440-1-yoshihiro.shimoda.uh@renesas.com/
   https://lore.kernel.org/linux-pci/20230222015327.3585691-1-yoshihiro.shimoda.uh@renesas.com/
 - Add maximum for max-link-speed and num-lanes to dt-bindings of both host and endpoint.
 - Add max-functions to dt-bindings of endpoint.
 - Use reg-names "app" on endpoint.
 - Remove unnecessary linkup and wait process in rcar_gen4_pcie_host_init().
 - Remove unnecessary macros in pcie-rcar-gen4.h.
 - Use dbi2 to write BAR mask registers.
 - Remove no_msix and intx_by_atu flags.
 - Reduce __dw_pcie_prog_outbound_atu() arguments.
 - Add dw_pcie_num_lanes_setup() to setup num_lanes.
 - Refactor dw_pcie_setup() to avoid PCIE_PORT_LINK_CONTROL writing twice.

Yoshihiro Shimoda (13):
  PCI: dwc: Fix writing wrong value if snps,enable-cdm-check
  PCI: endpoint: functions/pci-epf-test: Fix dma_chan direction
  dt-bindings: PCI: renesas: Add R-Car Gen4 PCIe Host
  dt-bindings: PCI: renesas: Add R-Car Gen4 PCIe Endpoint
  PCI: dwc: Refactor PCIE_PORT_LINK_CONTROL handling
  PCI: Add PCI_EXP_LNKCAP_MLW macros
  PCI: designware-ep: Expose dw_pcie_ep_exit() to module
  PCI: dwc: Add dw_pcie_num_lanes_setup()
  PCI: dwc: Add support for triggering legacy IRQs
  PCI: rcar-gen4: Add R-Car Gen4 PCIe Host support
  PCI: rcar-gen4-ep: Add R-Car Gen4 PCIe Endpoint support
  MAINTAINERS: Update PCI DRIVER FOR RENESAS R-CAR for R-Car Gen4
  misc: pci_endpoint_test: Add Device ID for R-Car S4-8 PCIe controller

 .../bindings/pci/rcar-gen4-pci-ep.yaml        |  97 ++++++++++
 .../bindings/pci/rcar-gen4-pci-host.yaml      | 108 +++++++++++
 MAINTAINERS                                   |   1 +
 drivers/misc/pci_endpoint_test.c              |   4 +
 drivers/pci/controller/dwc/Kconfig            |  18 ++
 drivers/pci/controller/dwc/Makefile           |   4 +
 .../pci/controller/dwc/pcie-designware-ep.c   |  70 +++++++-
 drivers/pci/controller/dwc/pcie-designware.c  | 130 +++++++++-----
 drivers/pci/controller/dwc/pcie-designware.h  |  18 +-
 .../pci/controller/dwc/pcie-rcar-gen4-ep.c    | 170 ++++++++++++++++++
 .../pci/controller/dwc/pcie-rcar-gen4-host.c  | 134 ++++++++++++++
 drivers/pci/controller/dwc/pcie-rcar-gen4.c   | 156 ++++++++++++++++
 drivers/pci/controller/dwc/pcie-rcar-gen4.h   |  56 ++++++
 drivers/pci/controller/dwc/pcie-tegra194.c    |   5 +-
 drivers/pci/endpoint/functions/pci-epf-test.c |   2 +-
 include/uapi/linux/pci_regs.h                 |   6 +
 16 files changed, 919 insertions(+), 60 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/pci/rcar-gen4-pci-ep.yaml
 create mode 100644 Documentation/devicetree/bindings/pci/rcar-gen4-pci-host.yaml
 create mode 100644 drivers/pci/controller/dwc/pcie-rcar-gen4-ep.c
 create mode 100644 drivers/pci/controller/dwc/pcie-rcar-gen4-host.c
 create mode 100644 drivers/pci/controller/dwc/pcie-rcar-gen4.c
 create mode 100644 drivers/pci/controller/dwc/pcie-rcar-gen4.h