[PATCH v3 3/4] docs: Add documentation for user space client interface

[Hemant Kumar <hemantk@codeaurora.org>]

MHI user space client driver is creating device file node
for user application to perform file operations. File
operations are handled by MHI core driver. Currently
Loopback MHI channel is supported by this driver.

Signed-off-by: Hemant Kumar <hemantk@codeaurora.org>
---
 Documentation/mhi/index.rst |  1 +
 Documentation/mhi/uci.rst   | 19 +++++++++++++++++++
 2 files changed, 20 insertions(+)
 create mode 100644 Documentation/mhi/uci.rst

diff --git a/Documentation/mhi/index.rst b/Documentation/mhi/index.rst
index 1d8dec3..c75a371 100644
--- a/Documentation/mhi/index.rst
+++ b/Documentation/mhi/index.rst
@@ -9,6 +9,7 @@ MHI
 
    mhi
    topology
+   uci
 
 .. only::  subproject and html
 
diff --git a/Documentation/mhi/uci.rst b/Documentation/mhi/uci.rst
new file mode 100644
index 0000000..a5c5c4f
--- /dev/null
+++ b/Documentation/mhi/uci.rst
@@ -0,0 +1,19 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+=================================
+User space Client Interface (UCI)
+=================================
+
+UCI driver enables user space clients to communicate to external MHI devices
+like modem and WLAN. It creates standard character device file nodes for user
+space clients to perform open, read, write, pool and close file operations.
+
+Device file node is created with format:-
+
+/dev/mhi_<controller_name>_<mhi_device_name>
+
+controller_name is the name of underlying bus used to transfer data.
+mhi_device_name is the name of the MHI channel being used by MHI client
+to send or receive data using MHI protocol. MHI channels are statically
+defined by MHI specification. Driver currently supports LOOPBACK channel
+index 0 (Host to device) and 1 (Device to Host).
-- 
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