netdev - [PATCH net-next 2/9] docs: ptp.rst: Add information about NVIDIA Mellanox devices

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Message-Id: <20230510205306.136766-3-rrameshbabu@nvidia.com>
Date: Wed, 10 May 2023 13:52:59 -0700
From: Rahul Rameshbabu <rrameshbabu@...dia.com>
To: netdev@...r.kernel.org
Cc: Saeed Mahameed <saeed@...nel.org>,
	Gal Pressman <gal@...dia.com>,
	Tariq Toukan <tariqt@...dia.com>,
	"David S. Miller" <davem@...emloft.net>,
	Jakub Kicinski <kuba@...nel.org>,
	Richard Cochran <richardcochran@...il.com>,
	Jacob Keller <jacob.e.keller@...el.com>
Subject: [PATCH net-next 2/9] docs: ptp.rst: Add information about NVIDIA Mellanox devices

The mlx5_core driver has implemented ptp clock driver functionality but
lacked documentation about the PTP devices. This patch adds information
about the Mellanox device family.

Signed-off-by: Rahul Rameshbabu <rrameshbabu@...dia.com>
---
 Documentation/driver-api/ptp.rst | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/Documentation/driver-api/ptp.rst b/Documentation/driver-api/ptp.rst
index c6ef41cf6130..6eab5253b800 100644
--- a/Documentation/driver-api/ptp.rst
+++ b/Documentation/driver-api/ptp.rst
@@ -123,3 +123,16 @@ Supported hardware
           - LPF settings (bandwidth, phase limiting, automatic holdover, physical layer assist (per ITU-T G.8273.2))
           - Programmable output PTP clocks, any frequency up to 1GHz (to other PHY/MAC time stampers, refclk to ASSPs/SoCs/FPGAs)
           - Lock to GNSS input, automatic switching between GNSS and user-space PHC control (optional)
+
+   * NVIDIA Mellanox
+
+     - GPIO
+          - Certain variants of ConnectX-6 Dx and later products support one
+            GPIO which can time stamp external triggers and one GPIO to produce
+            periodic signals.
+          - Certain variants of ConnectX-5 and older products support one GPIO,
+            configured to either time stamp external triggers or produce
+            periodic signals.
+     - PHC instances
+          - All ConnectX devices have a free-running counter
+          - ConnectX-6 Dx and later devices have a UTC format counter
-- 
2.38.4