[v4,00/12] treewide: PCI: renesas: 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.

Changes from v3:
 - Rebased on next-20220721.
 -- And reverted the following patch.
    ef685262346b PCI: designware-ep: Allow pcie_ep_set_bar change inbound map address
 -- And based on the following patches:
    [PATCH RESEND v4 00/15] PCI: dwc: Add hw version and dma-ranges support
    https://lore.kernel.org/linux-pci/20220624143947.8991-1-Sergey.Semin@baikalelectronics.ru/
    [PATCH v3 00/17] PCI: dwc: Add generic resources and Baikal-T1 support
    https://lore.kernel.org/linux-pci/20220610085706.15741-1-Sergey.Semin@baikalelectronics.ru/
    [PATCH v3 00/24] dmaengine: dw-edma: Add RP/EP local DMA controllers support
    https://lore.kernel.org/all/20220610091459.17612-1-Sergey.Semin@baikalelectronics.ru/
    [PATCH 2/3] arm64: dts: renesas: r8a779f0: Add SDHI0 support
    https://lore.kernel.org/all/20220711134656.277730-3-wsa+renesas@sang-engineering.com/
    [PATCH 3/3] arm64: dts: renesas: spider-cpu: enable eMMC0
    https://lore.kernel.org/all/20220711134656.277730-4-wsa+renesas@sang-engineering.com/
 - Patches' order is changed.
 - Add Reviewed-by in patch [01/12] and [01/12].
 - Modify pcie-designware.c to detect the eDMA in a new patch [07/12].
 https://lore.kernel.org/all/20220701085420.870306-1-yoshihiro.shimoda.uh@renesas.com/

Changes from v2:
 - Remove some unneeded functions in patch [09/13].
 - Fix error messages in patch [09/13].
 - Rebase implementation of patch [10/13] on patch [09/13].
 https://lore.kernel.org/all/20220627122417.809615-1-yoshihiro.shimoda.uh@renesas.com/

Changes from v1:
 - Fix a lot of warning/errors by 'make DT_CHECKER_FLAGS=-m dt_binding_check'.
 - Add PCI_EXP_LNKCAP_MLW macros into pci_regs.h
 - Remove "extern" in pcie-rcar-gen4.h.
 - Add ep_pre_init() into dw_pcie_ep_ops for this controller.
 - Add a new flag "reset_all_bars" into dw_pcie_ep. If this way is acceptable,
   I'll make patches for other endpoint controllers to simplify.
 - Move timing of getting num-lanes property for {ep_pre,host}_init().
 - Remove some platform_get_resource().
 - Remove "struct rcar_gen4_pcie_ep".
 - Allow a kernel module for both host and ep of this controller.
 - Minor fixes for checkpatch.pl.
 https://lore.kernel.org/all/20220613115712.2831386-1-yoshihiro.shimoda.uh@renesas.com/

Yoshihiro Shimoda (12):
  dt-bindings: PCI: renesas: Add R-Car Gen4 PCIe Host
  dt-bindings: PCI: renesas: Add R-Car Gen4 PCIe Endpoint
  PCI: Add PCI_EXP_LNKCAP_MLW macros
  PCI: controller: dwc: Expose dw_pcie_ep_exit() to module
  PCI: dwc: Add ep_pre_init() callback to dw_pcie_ep_ops
  PCI: dwc: Add reset_all_bars flag
  PCI: dwc: Avoid reading a register to detect whether eDMA exists
  PCI: renesas: Add R-Car Gen4 PCIe Host support
  PCI: renesas: Add R-Car Gen4 PCIe Endpoint support
  MAINTAINERS: Update PCI DRIVER FOR RENESAS R-CAR for R-Car Gen4
  arm64: dts: renesas: r8a779f0: Add PCIe Host and Endpoint nodes
  arm64: dts: renesas: r8a779f0: spider: Enable PCIe Host ch0

 .../bindings/pci/rcar-gen4-pci-ep.yaml        |  99 +++++++++
 .../bindings/pci/rcar-gen4-pci-host.yaml      |  97 +++++++++
 MAINTAINERS                                   |   1 +
 .../boot/dts/renesas/r8a779f0-spider-cpu.dtsi |  39 ++++
 arch/arm64/boot/dts/renesas/r8a779f0.dtsi     | 122 +++++++++++
 drivers/pci/controller/dwc/Kconfig            |  18 ++
 drivers/pci/controller/dwc/Makefile           |   4 +
 .../pci/controller/dwc/pcie-designware-ep.c   |  14 ++
 drivers/pci/controller/dwc/pcie-designware.c  |   4 +-
 drivers/pci/controller/dwc/pcie-designware.h  |   2 +
 .../pci/controller/dwc/pcie-rcar-gen4-ep.c    | 182 ++++++++++++++++
 .../pci/controller/dwc/pcie-rcar-gen4-host.c  | 195 ++++++++++++++++++
 drivers/pci/controller/dwc/pcie-rcar-gen4.c   | 181 ++++++++++++++++
 drivers/pci/controller/dwc/pcie-rcar-gen4.h   |  63 ++++++
 include/uapi/linux/pci_regs.h                 |   7 +
 15 files changed, 1026 insertions(+), 2 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