WARNING: line length of 81 exceeds 80 columns
#105: FILE: drivers/ptp/ptp_clock.c:453:
+		debugfs_create_file("n_perout_loopback", 0400, ptp->debugfs_root,

WARNING: line length of 82 exceeds 80 columns
#132: FILE: include/linux/ptp_clock_kernel.h:182:
+ *                   parameter index: index of the periodic output signal channel.

WARNING: line length of 82 exceeds 80 columns
#133: FILE: include/linux/ptp_clock_kernel.h:183:
+ *                   parameter on: caller passes one to enable or zero to disable.

total: 0 errors, 3 warnings, 0 checks, 112 lines checked

NOTE: For some of the reported defects, checkpatch may be able to
      mechanically convert to the typical style using --fix or --fix-inplace.

Commit 9c252f197ee2 ("ptp: add debugfs interfaces to loop back the periodic output signal") has style problems, please review.

NOTE: Ignored message types: ALLOC_SIZEOF_STRUCT BAD_REPORTED_BY_LINK CAMELCASE COMMIT_LOG_LONG_LINE GIT_COMMIT_ID MACRO_ARG_REUSE NO_AUTHOR_SIGN_OFF

NOTE: If any of the errors are false positives, please report
      them to the maintainer, see CHECKPATCH in MAINTAINERS.
total: 0 errors, 3 warnings, 0 checks, 112 lines checked