[PATCH v1 4/4] doc: add PTP IDPF documentation

[Soumyadeep Hore <soumyadeep.hore@intel.com>]

Updated the IDPF Documentation with PTP feature.

Signed-off-by: Soumyadeep Hore <soumyadeep.hore@intel.com>
---
 doc/guides/nics/idpf.rst | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/doc/guides/nics/idpf.rst b/doc/guides/nics/idpf.rst
index b99cc18188..e76632904b 100644
--- a/doc/guides/nics/idpf.rst
+++ b/doc/guides/nics/idpf.rst
@@ -109,3 +109,19 @@ The paths are chosen based on 2 conditions:
   A value "P" means the offload feature is not supported by vector path.
   If any not supported features are used, idpf vector PMD is disabled
   and the scalar paths are chosen.
+
+Time Synchronisation
+~~~~~~~~~~~~~~~~~~~~
+
+The system operator can run a PTP (Precision Time Protocol) client application
+to synchronise the time on the network card in ACC
+(and optionally the time on the system) to the PTP master.
+
+IDPF PMD supports PTP client applications that use the DPDK IEEE 1588 API
+to communicate with the PTP master clock.
+Note that PTP client application needs to run on PF in ACC
+and add the ``--force-max-simd-bitwidth=64`` startup parameter to disable vector mode.
+
+.. code-block:: console
+
+   examples/dpdk-ptpclient -l 0-3 -n 3 -a 0000:ec:00.1 --force-max-simd-bitwidth=64 -- -T 1 -p 0x1 -c 1
-- 
2.34.1