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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