WARNING: please write a help paragraph that fully describes the config symbol with at least 4 lines
#50: FILE: net/dsa/Kconfig:52:
+config NET_DSA_TAG_BRCM_LEGACY_FCS
+	tristate "Tag driver for Broadcom legacy switches using in-frame headers, FCS and length"
+	select NET_DSA_TAG_BRCM_COMMON
+	help
+	  Say Y if you want to enable support for tagging frames for the
+	  Broadcom legacy switches which place the tag after the MAC source
+	  address and require the original FCS and length.
+

WARNING: line length of 81 exceeds 80 columns
#98: FILE: net/dsa/tag_brcm.c:253:
+#endif /* CONFIG_NET_DSA_TAG_BRCM_LEGACY || CONFIG_NET_DSA_TAG_BRCM_LEGACY_FCS */

WARNING: line length of 81 exceeds 80 columns
#165: FILE: net/dsa/tag_brcm.c:362:
+MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_BRCM_LEGACY_FCS, BRCM_LEGACY_FCS_NAME);

total: 0 errors, 3 warnings, 0 checks, 137 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 06d37e1c65f1 ("net: dsa: tag_brcm: add support for legacy FCS tags") 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, 137 lines checked