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drivers/timers/ptp: support ptp clock driver model

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This patch introduces the foundational PTP (Precision Time Protocol) clock
driver framework for NuttX, enabling precise time synchronization support
based on IEEE 1588 standard.

Key changes include:

1. New PTP clock driver infrastructure:
   - Added drivers/timers/ptp_clock.c implementing upper-half driver
   - Created include/nuttx/timers/ptp_clock.h with PTP clock interfaces
   - Implemented upper/lower half driver architecture for hardware abstraction

2. Core functionality:
   - Clock time get/set operations (gettime, settime)
   - Frequency adjustment support (adjtime, adjfine)
   - Phase adjustment capabilities
   - System-device cross-timestamping for precise synchronization

3. IOCTL commands:
   - PTP_CLOCK_SETTIME/GETTIME for time manipulation
   - PTP_CLOCK_GETRES for resolution queries
   - PTP_CLOCK_ADJTIME for time adjustment
   - PTP_CLOCK_GETCAPS for capability queries
   - PTP_SYS_OFFSET* for system offset measurements

4. Supporting structures:
   - struct ptp_lowerhalf_s: lower-half driver interface
   - struct ptp_clock_caps: clock capabilities descriptor
   - struct ptp_sys_offset: system time offset measurement
   - Added timex structures in include/sys/timex.h for ADJ_* operations

5. Build system integration:
   - Added CONFIG_PTP_CLOCK Kconfig option
   - Updated CMakeLists.txt and Make.defs
   - Added PTPCLK debug macros in include/debug.h

This framework provides the base for PTP clock implementations, allowing
hardware-specific drivers to register and provide precise time services
through a standardized interface.

Signed-off-by: dongjiuzhu1 <dongjiuzhu1@xiaomi.com>
This commit is contained in:
dongjiuzhu1
2025-03-22 15:09:48 +08:00
committed by Alan C. Assis
parent 7298977894
commit 31eb339356
10 changed files with 1019 additions and 1 deletions
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Kconfig
+35
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@@ -2366,6 +2366,41 @@ config DEBUG_PCI_INFO
endif # DEBUG_PCI
config DEBUG_PTP
bool "PTP Debug Features"
default n
depends on PTP_CLOCK
---help---
Enable PTP driver debug features.
Support for this debug option is architecture-specific and may not
be available for some MCUs.
if DEBUG_PTP
config DEBUG_PTP_ERROR
bool "PTP Error Output"
default n
depends on DEBUG_ERROR
---help---
Enable PTP driver error output to SYSLOG.
config DEBUG_PTP_WARN
bool "PTP Warnings Output"
default n
depends on DEBUG_WARN
---help---
Enable PTP driver warning output to SYSLOG.
config DEBUG_PTP_INFO
bool "PTP Informational Output"
default n
depends on DEBUG_INFO
---help---
Enable PTP driver informational output to SYSLOG.
endif # DEBUG_PTP
config DEBUG_RPMSG
bool "RPMSG Debug Features"
default n