Error: Cannot open file drivers/ptp/ptp_clock_consumer.c
include/linux/ptp_clock_kernel.h:235: warning: No description found for return value of 'scaled_ppm_to_ppb'
include/linux/ptp_clock_kernel.h:292: warning: No description found for return value of 'adjust_by_scaled_ppm'
include/linux/ptp_clock_kernel.h:316: warning: No description found for return value of 'ptp_clock_register'
include/linux/ptp_clock_kernel.h:324: warning: No description found for return value of 'ptp_clock_unregister'
include/linux/ptp_clock_kernel.h:342: warning: No description found for return value of 'ptp_clock_index'
include/linux/ptp_clock_kernel.h:389: warning: No description found for return value of 'ptp_schedule_worker'
include/linux/ptp_clock_kernel.h:439: warning: No description found for return value of 'ptp_get_vclocks_index'
include/linux/ptp_clock_kernel.h:449: warning: No description found for return value of 'ptp_convert_timestamp'
include/linux/ptp_clock_kernel.h:237: warning: No description found for return value of 'scaled_ppm_to_ppb'
include/linux/ptp_clock_kernel.h:294: warning: No description found for return value of 'adjust_by_scaled_ppm'
include/linux/ptp_clock_kernel.h:318: warning: No description found for return value of 'ptp_clock_register'
include/linux/ptp_clock_kernel.h:326: warning: No description found for return value of 'ptp_clock_unregister'
include/linux/ptp_clock_kernel.h:344: warning: No description found for return value of 'ptp_clock_index'
include/linux/ptp_clock_kernel.h:491: warning: No description found for return value of 'ptp_schedule_worker'
include/linux/ptp_clock_kernel.h:564: warning: No description found for return value of 'ptp_get_vclocks_index'
include/linux/ptp_clock_kernel.h:574: warning: No description found for return value of 'ptp_convert_timestamp'