daniel-p-carvalho commented on PR #3782:
URL: https://github.com/apache/nuttx-apps/pull/3782#issuecomment-5721166920
Rebased onto latest `upstream/master` and updated the hardware clock
disciplining approach:
1. **POSIX `clock_adjtime` instead of proprietary ioctls:**
- Removed all custom ioctl calls (`SIOCS_PTP_ADJFREQ`,
`SIOCS_PTP_ADJPHASE`, `SIOCG_TX_HW_TIMESTAMP`).
- When a hardware PTP clock device (e.g. `/dev/ptp0`) is used via `-p
/dev/ptp0`, `ptpd` now acts as a PI servo driving the hardware clock's
frequency and phase alignment directly via standard POSIX
`clock_adjtime(state->clockid, &buf)` with `ADJ_FREQUENCY`.
- This aligns with the new POSIX PTP hardware clock driver introduced in
apache/nuttx#20180.
2. **Clean P2P delay & bugfix series:**
- Fixed Delay_Resp consumption by `sendmsg()` and implemented canonical
IEEE 1588 ยง11.3 mean path delay calculation.
- Implemented IEEE 1588 Peer-to-Peer (P2P) delay mechanism (`-P`).
- Added warning when P2P is used without `CONFIG_SCHED_TICKLESS`.
- Reset `pdelay_waiting_followup` when initiating a new P2P cycle to
prevent stale timestamp pairing.
- Discard implausible crystal oscillator drift rate spikes before
averaging to prevent drift divergence.
All 6 commits have been verified with `checkpatch.sh` (all checks pass) and
validated on physical hardware (STM32F4 Discovery with STM32 Ethernet PTP MAC
against a Meinberg PTP Grandmaster).
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