Visconti: Add Toshiba Visconti PCIe host controller driver

Hi,

This series is the PCIe driver for Toshiba's ARM SoC, Visconti[0].
This provides DT binding documentation, device driver, MAINTAINER files.

Best regards,
  Nobuhiro

[0]: https://toshiba.semicon-storage.com/ap-en/semiconductor/p...

  dt-bindings: pci: Add DT binding for Toshiba Visconti PCIe controller
    v2 -> v3:
      - No update.
    v1 -> v2:
      - Remove white space.
      - Drop num-viewport and bus-range from required.
      - Drop status line from example.
      - Drop bus-range from required.
      - Removed lines defined in pci-bus.yaml from required.

  PCI: Visconti: Add Toshiba Visconti PCIe host controller driver
    v2 -> v3:
      - Update subject.
      - Wrap description in 75 columns.
      - Change config name to PCIE_VISCONTI_HOST.
      - Update Kconfig text.
      - Drop empty lines.
      - Adjusted to 80 columns.
      - Drop inline from functions for register access.
      - Changed function name from visconti_pcie_check_link_status to
        visconti_pcie_link_up.
      - Update to using dw_pcie_host_init().
      - Reorder these in the order of use in visconti_pcie_establish_link().
      - Rewrite visconti_pcie_host_init() without dw_pcie_setup_rc().
      - Change function name from  visconti_device_turnon() to
        visconti_pcie_power_on().
      - Unify formats such as dev_err().
      - Drop error label in visconti_add_pcie_port(). 
    v1 -> v2:
      - Fix typo in commit message.
      - Drop "depends on OF && HAS_IOMEM" from Kconfig.
      - Stop using the pointer of struct dw_pcie.
      - Use _relaxed variant.
      - Drop dw_pcie_wait_for_link.
      - Drop dbi resource processing.
      - Drop MSI IRQ initialization processing.
  
  MAINTAINERS: Add entries for Toshiba Visconti PCIe controller
    v2 -> v3:
      - No update.
    v1 -> v2:
      - No update.

Nobuhiro Iwamatsu (3):
  dt-bindings: pci: Add DT binding for Toshiba Visconti PCIe controller
  PCI: Visconti: Add Toshiba Visconti PCIe host controller driver
  MAINTAINERS: Add entries for Toshiba Visconti PCIe controller

 .../bindings/pci/toshiba,visconti-pcie.yaml   | 110 ++++++
 MAINTAINERS                                   |   2 +
 drivers/pci/controller/dwc/Kconfig            |   9 +
 drivers/pci/controller/dwc/Makefile           |   1 +
 drivers/pci/controller/dwc/pcie-visconti.c    | 369 ++++++++++++++++++
 5 files changed, 491 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pci/toshiba,visconti-pcie.yaml
 create mode 100644 drivers/pci/controller/dwc/pcie-visconti.c

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2.31.1