Re: [PATCH v1 net-next 3/3] net: ena: Add PHC documentation

Provide the relevant information and guidelines
about the feature support in the ENA driver.

Signed-off-by: Amit Bernstein <redacted>
Signed-off-by: David Arinzon <darinzon@amazon.com>
---
 .../device_drivers/ethernet/amazon/ena.rst    | 78 +++++++++++++++++++
 1 file changed, 78 insertions(+)

diff --git a/Documentation/networking/device_drivers/ethernet/amazon/ena.rst b/Documentation/networking/device_drivers/ethernet/amazon/ena.rst
index 4561e8ab..9f490bb8 100644
--- a/Documentation/networking/device_drivers/ethernet/amazon/ena.rst
+++ b/Documentation/networking/device_drivers/ethernet/amazon/ena.rst

@@ -56,6 +56,7 @@ ena_netdev.[ch]     Main Linux kernel driver.
 ena_ethtool.c       ethtool callbacks.
 ena_xdp.[ch]        XDP files
 ena_pci_id_tbl.h    Supported device IDs.
+ena_phc.[ch]        PTP hardware clock infrastructure (see `PHC`_ for more info)
 =================   ======================================================
 
 Management Interface:

@@ -221,6 +222,83 @@ descriptor it was received on would be recycled. When a packet smaller
 than RX copybreak bytes is received, it is copied into a new memory
 buffer and the RX descriptor is returned to HW.
 
+.. _`PHC`:
+
+PTP Hardware Clock (PHC)
+======================
+.. _`ptp-userspace-api`: https://docs.kernel.org/driver-api/ptp.html#ptp-hardware-clock-user-space-api
+.. _`testptp`: https://elixir.bootlin.com/linux/latest/source/tools/testing/selftests/ptp/testptp.c