752a405f86
This patch implements clock_adjtime() with CLOCKFD support, enabling
precise time and frequency adjustments for PTP clocks through the
standard POSIX clock API.
Key changes include:
1. New clock_adjtime() system call:
- Added sched/clock/clock_adjtime.c implementation
- Provides POSIX-compliant time adjustment interface
- Supports both standard clocks and CLOCKFD-based dynamic clocks
- Added CONFIG_CLOCK_ADJTIME Kconfig option
2. CLOCKFD support in clock_adjtime():
- Detects CLOCKFD-encoded clockids via CLOCKFD_TO_FD() check
- Extracts file descriptor and validates through fs_getfilep()
- Issues PTP_CLOCK_ADJTIME ioctl to underlying PTP clock device
- Returns clock status and adjustment results via struct timex
3. Enhanced struct timex support:
- Extended include/sys/timex.h with additional ADJ_* flags
- Added ADJ_OFFSET, ADJ_FREQUENCY, ADJ_MAXERROR, ADJ_ESTERROR
- Added ADJ_STATUS, ADJ_TIMECONST, ADJ_TAI, ADJ_SETOFFSET
- Added ADJ_MICRO, ADJ_NANO for time unit selection
- Added STA_* status flags for clock state reporting
4. Clock operations supported:
- ADJ_SETOFFSET: Apply time offset adjustment
- ADJ_FREQUENCY: Adjust clock frequency (PPM)
- ADJ_MAXERROR: Set maximum error estimate
- ADJ_ESTERROR: Set estimated error
- ADJ_STATUS: Modify clock status bits
- ADJ_NANO: Use nanosecond resolution
- ADJ_SETOFFSET: Set absolute time offset
5. API declarations:
- Added clock_adjtime() prototype in include/nuttx/clock.h
- Enabled by CONFIG_CLOCK_ADJTIME configuration
- Compatible with Linux clock_adjtime() interface
Usage example:
int fd = open("/dev/ptp0", O_RDWR);
struct timex tx = {0};
tx.modes = ADJ_FREQUENCY;
tx.freq = 10000000; /* Adjust frequency by 10 PPM */
clock_adjtime(CLOCKFD(fd), &tx);
close(fd);
This completes the PTP clock framework's POSIX clock API integration,
providing comprehensive time control capabilities for precision timing
applications including PTP synchronization daemons (ptp4l, timemaster).
Signed-off-by: dongjiuzhu1 <dongjiuzhu1@xiaomi.com>
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| arch | ||
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| binfmt | ||
| boards | ||
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| .asf.yaml | ||
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| CMakeLists.txt | ||
| CONTRIBUTING.md | ||
| INVIOLABLES.md | ||
| Kconfig | ||
| LICENSE | ||
| Makefile | ||
| NOTICE | ||
| README.md | ||
| ReleaseNotes | ||
Apache NuttX is a real-time operating system (RTOS) with an emphasis on standards compliance and small footprint. Scalable from 8-bit to 64-bit microcontroller environments, the primary governing standards in NuttX are POSIX and ANSI standards. Additional standard APIs from Unix and other common RTOSs (such as VxWorks) are adopted for functionality not available under these standards, or for functionality that is not appropriate for deeply-embedded environments (such as fork()).
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