Add documentation to help users use pci-epf-ntb function driver and
existing host side NTB infrastructure for NTB functionality.

Signed-off-by: Kishon Vijay Abraham I <redacted>
Reviewed-by: Randy Dunlap <redacted>
---
 Documentation/PCI/endpoint/index.rst         |   1 +
 Documentation/PCI/endpoint/pci-ntb-howto.rst | 160 +++++++++++++++++++
 2 files changed, 161 insertions(+)
 create mode 100644 Documentation/PCI/endpoint/pci-ntb-howto.rst

diff --git a/Documentation/PCI/endpoint/index.rst b/Documentation/PCI/endpoint/index.rst
index 9cb6e5f3c4d5..38ea1f604b6d 100644
--- a/Documentation/PCI/endpoint/index.rst
+++ b/Documentation/PCI/endpoint/index.rst

@@ -12,6 +12,7 @@ PCI Endpoint Framework
    pci-test-function
    pci-test-howto
    pci-ntb-function
+   pci-ntb-howto
 
    function/binding/pci-test
    function/binding/pci-ntb

diff --git a/Documentation/PCI/endpoint/pci-ntb-howto.rst b/Documentation/PCI/endpoint/pci-ntb-howto.rst
new file mode 100644
index 000000000000..b6e1073c9a39
--- /dev/null
+++ b/Documentation/PCI/endpoint/pci-ntb-howto.rst

@@ -0,0 +1,160 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+===================================================================
+PCI Non-Transparent Bridge (NTB) Endpoint Function (EPF) User Guide
+===================================================================
+
+:Author: Kishon Vijay Abraham I <kishon@ti.com>
+
+This document is a guide to help users use pci-epf-ntb function driver
+and ntb_hw_epf host driver for NTB functionality. The list of steps to
+be followed in the host side and EP side is given below. For the hardware
+configuration and internals of NTB using configurable endpoints see
+Documentation/PCI/endpoint/pci-ntb-function.rst
+
+Endpoint Device
+===============
+
+Endpoint Controller Devices
+---------------------------
+
+For implementing NTB functionality at least two endpoint controller devices
+are required.
+To find the list of endpoint controller devices in the system::