Add Documentation to help users use pci endpoint to configure
pci endpoint function and to bind the endpoint function
with endpoint controller.

Signed-off-by: Kishon Vijay Abraham I <kis...@ti.com>
---
 Documentation/PCI/00-INDEX                      |    2 +
 Documentation/PCI/endpoint/pci-endpoint-cfs.txt |   84 +++++++++++++++++++++++
 2 files changed, 86 insertions(+)
 create mode 100644 Documentation/PCI/endpoint/pci-endpoint-cfs.txt

diff --git a/Documentation/PCI/00-INDEX b/Documentation/PCI/00-INDEX
index ba950b2..f84a23c 100644
--- a/Documentation/PCI/00-INDEX
+++ b/Documentation/PCI/00-INDEX
@@ -14,3 +14,5 @@ pcieaer-howto.txt
        - the PCI Express Advanced Error Reporting Driver Guide HOWTO
 endpoint/pci-endpoint.txt
        - guide to add endpoint controller driver and endpoint function driver.
+endpoint/pci-endpoint-cfs.txt
+       - guide to use configfs to configure the pci endpoint function.
diff --git a/Documentation/PCI/endpoint/pci-endpoint-cfs.txt 
b/Documentation/PCI/endpoint/pci-endpoint-cfs.txt
new file mode 100644
index 0000000..d9f8734
--- /dev/null
+++ b/Documentation/PCI/endpoint/pci-endpoint-cfs.txt
@@ -0,0 +1,84 @@
+                   CONFIGURING PCI ENDPOINT USING CONFIGFS
+                    Kishon Vijay Abraham I <kis...@ti.com>
+
+The PCI Endpoint Core exposes configfs entry (pci_ep) in order to configure the
+PCI endpoint function and in order to bind the endpoint function
+with the endpoint controller. (For introducing other mechanisms to
+configure the PCI Endpoint Function refer [1]).
+
+*) Mounting configfs
+
+The PCI Endpoint Core layer creates pci_ep directory in the mounted configfs
+directory. configfs can be mounted using the following command.
+
+       mount -t configfs none /sys/kernel/config
+
+*) Directory Structure
+
+The pci_ep configfs directory structure has been created to reflect the
+natural tree like structure of PCI devices. So every directory created
+inside pci_ep represents a EPC device and every directory created inside
+epf directory represents EPF device.
+
+/sys/kernel/config/pci_ep/
+                        | <dir>/ --------------------------------------> [2]
+                               | epc
+                               | epf/
+                                    | <dir>/ --------------------------> [3]
+                                           | vendorid
+                                           | deviceid
+                                           | revid
+                                           | progif_code
+                                           | subclass_code
+                                           | baseclass_code
+                                           | cache_line_size
+                                           | subsys_vendor_id
+                                           | subsys_id
+                                           | interrupt_pin
+                                           | function
+
+*) Creating configfs entry for EPC
+
+Any directory created inside *pci_ep* represents an EPC device. In the above
+directory structure [2] represents an EPC device. It consists of
+
+       *) epc: Use it to associate the configfs entry to an actual EPC device.
+               The list of valid entries for this field can be obtained from
+                       ls /sys/class/pci_epc/
+
+       *) epf: Directory that contains all the endpoint functions. The name
+               of the created directory determines the driver this particular
+               epf device will be bound to. The name can be obtained either
+               from the function binding documentation [4] or
+                       ls /sys/bus/pci-epf/drivers
+
+               If more than one endpoint function device has to be bound to
+               the same driver, then the directory should be created using
+               the following notation
+                       mkdir <name>.<num>
+
+*) Creating configfs entry for EPF
+
+Any directory created inside *epf* directory represents an EPF device. In the
+above directory structure, [3] represents an EPF device. It consists of the
+following entries that can be used to configure the standard configuration
+header of the endpoint function. (These entries are created by the
+framework when any new directory is created inside epf directory.)
+
+        | vendorid
+        | deviceid
+        | revid
+        | progif_code
+        | subclass_code
+        | baseclass_code
+        | cache_line_size
+        | subsys_vendor_id
+        | subsys_id
+        | interrupt_pin
+
+The following entry identifies the function driver that is bound to the
+function device
+       | function
+
+[1] -> Documentation/PCI/endpoint/pci-endpoint.txt
+[4] -> Documentation/PCI/endpoint/function/binding/
-- 
1.7.9.5

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