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ice: add support for reading SyncE DPLL state
Implement SyncE DPLL monitoring for E810-T devices. Poll loop will periodically check the state of the DPLL and cache it in the pf structure. State change will be logged in the system log. Cached state can be read using the RTM_GETSYNCESTATE rtnetlink message. Different SyncE sources will be reported depending on the pin driving the DPLL: - pins 0-1: can be driven by PTP clock - pins 2-5: are used by SyncE recovered clocks - pins 6-7: can be used to connect external frequency sources - pin 8: is connected to the optional GNSS receiver Signed-off-by: Maciej Machnikowski <maciej.machnikowski@intel.com>
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