pcie: ti: add driver for AM65x PCIe RC

Add driver supporting PCIe root-complex available
on TI's AM65x SoC.
Signed-off-by: NSekhar Nori <nsekhar@ti.com>

drivers/pci/Kconfig

@@ -145,4 +145,10 @@ config PCI_MVEBU
 	  Say Y here if you want to enable PCIe controller support on
 	  Armada XP/38x SoCs.
 
+config PCI_KEYSTONE
+	bool "TI Keystone PCIe controller"
+	depends on DM_PCI
+	help
+	  Say Y here if you want to enable PCI controller support on AM654 SoC.
+
 endif

drivers/pci/Makefile

@@ -38,3 +38,4 @@ obj-$(CONFIG_PCIE_LAYERSCAPE_GEN4) += pcie_layerscape_gen4.o \
 				pcie_layerscape_gen4_fixup.o
 obj-$(CONFIG_PCI_XILINX) += pcie_xilinx.o
 obj-$(CONFIG_PCIE_INTEL_FPGA) += pcie_intel_fpga.o
+obj-$(CONFIG_PCI_KEYSTONE) += pcie_dw_ti.o