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This patch adds a dummy PTP clock driver implementation that provides a software-based PTP clock for testing and development purposes. Key changes include: 1. Dummy PTP clock driver implementation: - Added drivers/timers/ptp_clock_dummy.c - Provides software-based PTP clock using system monotonic clock - Implements all required lower-half driver operations 2. Lower-half driver operations: - adjfine: Frequency adjustment (stores adjustment value) - adjtime: Time offset adjustment (applies delta to base time) - gettime: Returns current PTP clock time - settime: Sets PTP clock time - getcaps: Reports clock capabilities (1 billion PPB max adjustment) - getcrosststamp: Provides system/device cross-timestamp 3. Driver initialization: - Added ptp_clock_dummy_init() in drivers/drivers_initialize.c - Auto-registration under CONFIG_PTP_CLOCK_DUMMY configuration - Creates /dev/ptp0 character device node 4. Build system integration: - Added CONFIG_PTP_CLOCK_DUMMY Kconfig option (depends on PTP_CLOCK) - Updated CMakeLists.txt and Make.defs - Added include/nuttx/timers/ptp_clock_dummy.h header 5. Implementation details: - Uses clock_gettime(CLOCK_MONOTONIC) as time base - Tracks time offset and frequency adjustment internally - Suitable for testing PTP clock applications without hardware This dummy driver enables development and testing of PTP clock applications on platforms without dedicated PTP hardware support. Signed-off-by: dongjiuzhu1 <dongjiuzhu1@xiaomi.com> |
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