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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>
authored by
Rahul Rameshbabu
and committed by
David S. Miller
fe3834cd
a05d070a
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Documentation/driver-api/ptp.rst
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Documentation/driver-api/ptp.rst
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- LPF settings (bandwidth, phase limiting, automatic holdover, physical layer assist (per ITU-T G.8273.2))
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- Programmable output PTP clocks, any frequency up to 1GHz (to other PHY/MAC time stampers, refclk to ASSPs/SoCs/FPGAs)
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- Lock to GNSS input, automatic switching between GNSS and user-space PHC control (optional)
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* NVIDIA Mellanox
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- GPIO
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- Certain variants of ConnectX-6 Dx and later products support one
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GPIO which can time stamp external triggers and one GPIO to produce
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periodic signals.
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- Certain variants of ConnectX-5 and older products support one GPIO,
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configured to either time stamp external triggers or produce
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periodic signals.
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- PHC instances
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- All ConnectX devices have a free-running counter
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- ConnectX-6 Dx and later devices have a UTC format counter