PCI: endpoint: functions: Add an EP function to test PCI

Adds a new endpoint function driver (to program the virtual test device)
making use of the EP-core library.

[bhelgaas: fold in pci_epf_test_probe() -ENOMEM test from Wei Yongjun
<weiyongjun1@huawei.com>]
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

drivers/pci/endpoint/Kconfig

@@ -26,4 +26,6 @@ config PCI_ENDPOINT_CONFIGFS
 	   configure the endpoint function and used to bind the
 	   function with a endpoint controller.
 
+source "drivers/pci/endpoint/functions/Kconfig"
+
 endmenu

drivers/pci/endpoint/Makefile

@@ -4,4 +4,4 @@
 
 obj-$(CONFIG_PCI_ENDPOINT_CONFIGFS)	+= pci-ep-cfs.o
 obj-$(CONFIG_PCI_ENDPOINT)		+= pci-epc-core.o pci-epf-core.o\
-					   pci-epc-mem.o
+					   pci-epc-mem.o functions/

drivers/pci/endpoint/functions/Kconfig

+#
+# PCI Endpoint Functions
+#
+
+config PCI_EPF_TEST
+	tristate "PCI Endpoint Test driver"
+	depends on PCI_ENDPOINT
+	help
+	   Enable this configuration option to enable the test driver
+	   for PCI Endpoint.
+
+	   If in doubt, say "N" to disable Endpoint test driver.

drivers/pci/endpoint/functions/Makefile

+#
+# Makefile for PCI Endpoint Functions
+#
+
+obj-$(CONFIG_PCI_EPF_TEST)		+= pci-epf-test.o