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authorRahul Rameshbabu <rrameshbabu@nvidia.com>2023-06-12 14:14:53 -0700
committerDavid S. Miller <davem@davemloft.net>2023-06-20 09:02:32 +0100
commitfe3834cd0cf74b06847a1001ac44b7e2c035b5bc (patch)
tree3125345818bb21e75ecbf82d840dd83277079cde /Documentation/driver-api
parenta05d070a6164bd0578991e42181a52b9c7cf630c (diff)
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@nvidia.com> Acked-by: Richard Cochran <richardcochran@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'Documentation/driver-api')
-rw-r--r--Documentation/driver-api/ptp.rst13
1 files changed, 13 insertions, 0 deletions
diff --git a/Documentation/driver-api/ptp.rst b/Documentation/driver-api/ptp.rst
index 4552a1f20488..5e033c3b11b3 100644
--- a/Documentation/driver-api/ptp.rst
+++ b/Documentation/driver-api/ptp.rst
@@ -122,3 +122,16 @@ 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