Introduce a new configfs entry to configure the EP function (like
configuring the standard configuration header entries) and to
bind the EP function with EP controller.

Signed-off-by: Kishon Vijay Abraham I <redacted>
---
 drivers/pci/endpoint/Kconfig      |   14 +-
 drivers/pci/endpoint/Makefile     |    1 +
 drivers/pci/endpoint/pci-ep-cfs.c |  427 +++++++++++++++++++++++++++++++++++++
 3 files changed, 440 insertions(+), 2 deletions(-)
 create mode 100644 drivers/pci/endpoint/pci-ep-cfs.c

diff --git a/drivers/pci/endpoint/Kconfig b/drivers/pci/endpoint/Kconfig
index 7eb1c79..8470f0b 100644
--- a/drivers/pci/endpoint/Kconfig
+++ b/drivers/pci/endpoint/Kconfig

@@ -6,7 +6,6 @@ menu "PCI Endpoint"
 
 config PCI_ENDPOINT
 	bool "PCI Endpoint Support"
-	select CONFIGFS_FS
 	help
 	   Enable this configuration option to support configurable PCI
 	   endpoint. This should be enabled if the platform has a PCI

@@ -14,8 +13,19 @@ config PCI_ENDPOINT
 
 	   Enabling this option will build the endpoint library, which
 	   includes endpoint controller library and endpoint function
-	   library.
+	   library. This will also enable the configfs entry required to
+	   configure the endpoint function and used to bind the
+	   function with a endpoint controller.
 
 	   If in doubt, say "N" to disable Endpoint support.
 
+config PCI_ENDPOINT_CONFIGFS
+	bool "PCI Endpoint Configfs Support"
+	depends on PCI_ENDPOINT
+	select CONFIGFS_FS
+	help
+	   This will enable the configfs entry that can be used to
+	   configure the endpoint function and used to bind the
+	   function with a endpoint controller.
+
 endmenu

diff --git a/drivers/pci/endpoint/Makefile b/drivers/pci/endpoint/Makefile
index dc1bc16..dd9163c 100644
--- a/drivers/pci/endpoint/Makefile
+++ b/drivers/pci/endpoint/Makefile

@@ -4,3 +4,4 @@
 
 obj-$(CONFIG_PCI_ENDPOINT)		+= pci-epc-core.o pci-epf-core.o\
 					   pci-epc-mem.o
+obj-$(CONFIG_PCI_ENDPOINT_CONFIGFS)	+= pci-ep-cfs.o

diff --git a/drivers/pci/endpoint/pci-ep-cfs.c b/drivers/pci/endpoint/pci-ep-cfs.c
new file mode 100644
index 0000000..ed0f8c2
--- /dev/null
+++ b/drivers/pci/endpoint/pci-ep-cfs.c

@@ -0,0 +1,427 @@
+/**
+ * configfs to configure the PCI endpoint
+ *
+ * Copyright (C) 2017 Texas Instruments
+ * Author: Kishon Vijay Abraham I <kishon@ti.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 of
+ * the License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/configfs.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+
+#include <linux/pci-epc.h>
+#include <linux/pci-epf.h>
+
+struct pci_epf_info {
+	struct config_group group;
+	struct list_head list;
+	struct pci_epf *epf;
+};
+
+struct pci_ep_info {
+	struct config_group group;
+	struct config_group pci_epf_group;
+	/* mutex to protect pci_epf list */
+	struct mutex lock;
+	struct list_head pci_epf;
+	const char *epc_name;
+	struct pci_epc *epc;
+};
+
+static inline struct pci_epf_info *to_pci_epf_info(struct config_item *item)
+{
+	return container_of(to_config_group(item), struct pci_epf_info, group);
+}
+
+static inline struct pci_ep_info *to_pci_ep_info(struct config_item *item)
+{
+	return container_of(to_config_group(item), struct pci_ep_info, group);
+}
+
+#define PCI_EPF_HEADER_R(_name)						       \
+static ssize_t pci_epf_##_name##_show(struct config_item *item,	char *page)    \
+{									       \
+	struct pci_epf *epf = to_pci_epf_info(item)->epf;		       \
+	if (!epf->header) {						       \
+		WARN_ON_ONCE("epf device not bound to function driver\n");     \