WARNING: Block comments should align the * on each line
#169: FILE: drivers/mfd/zl3073x-core.c:300:
+ * Writes selected fields from the mailbox into device.
+  *

WARNING: Block comments should align the * on each line
#170: FILE: drivers/mfd/zl3073x-core.c:301:
+  *
+ * Return: 0 on success, <0 on error

CHECK: Please use a blank line after function/struct/union/enum declarations
#575: FILE: include/linux/mfd/zl3073x.h:43:
+};
+#define ZL3073X_MB_DPLL_REF_PRIO(_ref_pair)	BIT(_ref_pair)

CHECK: Please use a blank line after function/struct/union/enum declarations
#617: FILE: include/linux/mfd/zl3073x.h:85:
+};
+#define ZL3073X_MB_OUTPUT_MODE			BIT(0)

CHECK: Please use a blank line after function/struct/union/enum declarations
#660: FILE: include/linux/mfd/zl3073x.h:128:
+};
+#define ZL3073X_MB_REF_FREQ_BASE		BIT(0)

CHECK: Please use a blank line after function/struct/union/enum declarations
#684: FILE: include/linux/mfd/zl3073x.h:152:
+};
+#define ZL3073X_MB_SYNTH_FREQ_BASE		BIT(0)

CHECK: Alignment should match open parenthesis
#690: FILE: include/linux/mfd/zl3073x.h:158:
+int zl3073x_mb_synth_read(struct zl3073x_dev *zldev, u8 index, u32 fields,
+			   struct zl3073x_mb_synth *mb);

total: 0 errors, 2 warnings, 5 checks, 645 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 16f7365711d6 ("mfd: zl3073x: Add functions to work with register mailboxes") 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, 2 warnings, 5 checks, 645 lines checked