PCI: eswin: Add ESWIN PCIe Root Complex driver

Add driver for the ESWIN PCIe Root Complex based on the DesignWare PCIe
core, IP revision 5.96a. The PCIe Gen.3 Root Complex supports data rate of
8 GT/s and x4 lanes, with INTx and MSI interrupt capability.

Signed-off-by: Yu Ning <ningyu@eswincomputing.com>
Signed-off-by: Yanghui Ou <ouyanghui@eswincomputing.com>
Signed-off-by: Senchuan Zhang <zhangsenchuan@eswincomputing.com>
[mani: renamed "EIC7700" to "ESWIN", added maintainers entry, removed async probe]
Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
[bhelgaas: add driver tag in subject]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Link: https://patch.msgid.link/20260227111808.1996-1-zhangsenchuan@eswincomputing.com

Author: zhangsenchuaneswincomputing

MAINTAINERS

@@ -20494,6 +20494,13 @@ L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
 S:	Odd Fixes
 F:	drivers/pci/controller/pci-thunder-*
 
+PCIE DRIVER FOR ESWIN
+M:	Senchuan Zhang <zhangsenchuan@eswincomputing.com>
+L:	linux-pci@vger.kernel.org
+S:	Maintained
+F:	Documentation/devicetree/bindings/pci/eswin,pcie.yaml
+F:	drivers/pci/controller/dwc/pcie-eswin.c
+
 PCIE DRIVER FOR HISILICON
 M:	Zhou Wang <wangzhou1@hisilicon.com>
 L:	linux-pci@vger.kernel.org

drivers/pci/controller/dwc/Kconfig

@@ -93,6 +93,16 @@ config PCIE_BT1
 	  Enables support for the PCIe controller in the Baikal-T1 SoC to work
 	  in host mode. It's based on the Synopsys DWC PCIe v4.60a IP-core.
 
+config PCIE_ESWIN
+	tristate "ESWIN PCIe controller"
+	depends on ARCH_ESWIN || COMPILE_TEST
+	depends on PCI_MSI
+	select PCIE_DW_HOST
+	help
+	  Say Y here if you want PCIe controller support for the ESWIN SoCs.
+	  The PCIe controller in ESWIN SoCs is based on DesignWare hardware, and
+	  works only in host mode.
+
 config PCI_IMX6
 	bool
 

drivers/pci/controller/dwc/Makefile

@@ -6,6 +6,7 @@ obj-$(CONFIG_PCIE_DW_EP) += pcie-designware-ep.o
 obj-$(CONFIG_PCIE_DW_PLAT) += pcie-designware-plat.o
 obj-$(CONFIG_PCIE_AMD_MDB) += pcie-amd-mdb.o
 obj-$(CONFIG_PCIE_BT1) += pcie-bt1.o
+obj-$(CONFIG_PCIE_ESWIN) += pcie-eswin.o
 obj-$(CONFIG_PCI_DRA7XX) += pci-dra7xx.o
 obj-$(CONFIG_PCI_EXYNOS) += pci-exynos.o
 obj-$(CONFIG_PCIE_FU740) += pcie-fu740.o