Thread (24 messages) 24 messages, 3 authors, 2023-05-22
STALE1139d

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

From: Rahul Rameshbabu <rrameshbabu@nvidia.com>
Date: 2023-05-10 20:56:00
Subsystem: documentation, ptp hardware clock support, the rest · Maintainers: Jonathan Corbet, Richard Cochran, Linus Torvalds

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@nvidia.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
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