WARNING: return sysfs_emit(...) formats should include a terminating newline
#35: FILE: drivers/ptp/ptp_ocp.c:3357:
+	return sysfs_emit(buf, "ttyS%d", port->line);

WARNING: line length of 84 exceeds 80 columns
#39: FILE: drivers/ptp/ptp_ocp.c:3361:
+ptp_ocp_timecard_tty_is_visible(struct kobject *kobj, struct attribute *attr, int n)

CHECK: Please use a blank line after function/struct/union/enum declarations
#54: FILE: drivers/ptp/ptp_ocp.c:3376:
+}
+#define EXT_TTY_ATTR_RO(_name, _val)			\

WARNING: line length of 82 exceeds 80 columns
#56: FILE: drivers/ptp/ptp_ocp.c:3378:
+		{ __ATTR(tty##_name, 0444, ptp_ocp_tty_show, NULL), (void *)_val }

total: 0 errors, 3 warnings, 1 checks, 98 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 c393bdca713a ("ptp: ocp: adjust sysfs entries to expose tty information") 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, 1 checks, 98 lines checked