PCI: uniphier: Add UniPhier PCIe host controller support

This introduces specific glue layer for UniPhier platform to support
PCIe host controller that is based on the DesignWare PCIe core, and
this driver supports Root Complex (host) mode.

Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>

MAINTAINERS

@@ -11578,6 +11578,13 @@ S:	Maintained
 F:	Documentation/devicetree/bindings/pci/v3-v360epc-pci.txt
 F:	drivers/pci/controller/pci-v3-semi.c
 
+PCIE DRIVER FOR SOCIONEXT UNIPHIER
+M:	Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
+L:	linux-pci@vger.kernel.org
+S:	Maintained
+F:	Documentation/devicetree/bindings/pci/uniphier-pcie.txt
+F:	drivers/pci/controller/dwc/pcie-uniphier.c
+
 PCIE DRIVER FOR ST SPEAR13XX
 M:	Pratyush Anand <pratyush.anand@gmail.com>
 L:	linux-pci@vger.kernel.org

drivers/pci/controller/dwc/Kconfig

@@ -193,4 +193,14 @@ config PCIE_HISI_STB
 	help
           Say Y here if you want PCIe controller support on HiSilicon STB SoCs
 
+config PCIE_UNIPHIER
+	bool "Socionext UniPhier PCIe controllers"
+	depends on ARCH_UNIPHIER || COMPILE_TEST
+	depends on OF && HAS_IOMEM
+	depends on PCI_MSI_IRQ_DOMAIN
+	select PCIE_DW_HOST
+	help
+	  Say Y here if you want PCIe controller support on UniPhier SoCs.
+	  This driver supports LD20 and PXs3 SoCs.
+
 endmenu

drivers/pci/controller/dwc/Makefile

@@ -14,6 +14,7 @@ obj-$(CONFIG_PCIE_ARMADA_8K) += pcie-armada8k.o
 obj-$(CONFIG_PCIE_ARTPEC6) += pcie-artpec6.o
 obj-$(CONFIG_PCIE_KIRIN) += pcie-kirin.o
 obj-$(CONFIG_PCIE_HISI_STB) += pcie-histb.o
+obj-$(CONFIG_PCIE_UNIPHIER) += pcie-uniphier.o
 
 # The following drivers are for devices that use the generic ACPI
 # pci_root.c driver but don't support standard ECAM config access.