PCI: endpoint: Add EP core layer to enable EP controller and EP functions

Introduce a new EP core layer in order to support endpoint functions in
linux kernel. This comprises the EPC library (Endpoint Controller Library)
and EPF library (Endpoint Function Library). EPC library implements
functions specific to an endpoint controller and EPF library implements
functions specific to an endpoint function.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Acked-by: Joao Pinto <jpinto@synopsys.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
diff --git a/drivers/pci/endpoint/Kconfig b/drivers/pci/endpoint/Kconfig
new file mode 100644
index 0000000..a5442ac
--- /dev/null
+++ b/drivers/pci/endpoint/Kconfig
@@ -0,0 +1,20 @@
+#
+# PCI Endpoint Support
+#
+
+menu "PCI Endpoint"
+
+config PCI_ENDPOINT
+	bool "PCI Endpoint Support"
+	help
+	   Enable this configuration option to support configurable PCI
+	   endpoint. This should be enabled if the platform has a PCI
+	   controller that can operate in endpoint mode.
+
+	   Enabling this option will build the endpoint library, which
+	   includes endpoint controller library and endpoint function
+	   library.
+
+	   If in doubt, say "N" to disable Endpoint support.
+
+endmenu