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docs: ptp.rst: Add information about NVIDIA Mellanox devices

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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>
This commit is contained in:
Rahul Rameshbabu 2023-06-12 14:14:53 -07:00 committed by David S. Miller
parent a05d070a61
commit fe3834cd0c
1 changed files with 13 additions and 0 deletions
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Documentation/driver-api/ptp.rst
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@ -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