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我的嵌入式设备上运行着 ptp4l 和 phc2sys。我需要以某种方式从另一个内核模块读取 ptp 主偏移量。我可以从 /dev/ptp0 做吗？怎么做？我彻底研究了 testptp.c 但没有找到读取主偏移值的解决方案....