pci_ep: add Cadence PCIe endpoint driver

Add Cadence PCIe endpoint driver supporting configuration
of header, bars and MSI for device.

Signed-off-by: Ramon Fried <ramon.fried@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/pci_endpoint/Kconfig b/drivers/pci_endpoint/Kconfig
index ac4f43d..e00cb75 100644
--- a/drivers/pci_endpoint/Kconfig
+++ b/drivers/pci_endpoint/Kconfig
@@ -14,4 +14,12 @@
 	   controllers that can operate in endpoint mode (as a device
 	   connected to PCI host or bridge).
 
+config PCIE_CADENCE_EP
+	bool "Cadence PCIe endpoint controller"
+	depends on PCI_ENDPOINT
+	help
+	  Say Y here if you want to support the Cadence PCIe controller in
+	  endpoint mode. This PCIe controller may be embedded into many
+	  different vendors SoCs.
+
 endmenu