WARNING: please write a help paragraph that fully describes the config symbol with at least 4 lines
#30: FILE: drivers/net/mdio/Kconfig:188:
+config MDIO_REALTEK_RTL9300
+	tristate "Realtek RTL9300 MDIO interface support"
+	depends on MACH_REALTEK_RTL || COMPILE_TEST
+	help
+	  This driver supports the MDIO interface found in the Realtek
+	  RTL9300 family of Ethernet switches with integrated SoC.
+

WARNING: added, moved or deleted file(s), does MAINTAINERS need updating?
#53: 
new file mode 100644

WARNING: line length of 93 exceeds 80 columns
#171: FILE: drivers/net/mdio/mdio-realtek-rtl9300.c:114:
+	err = regmap_write(regmap, SMI_ACCESS_PHY_CTRL_2, FIELD_PREP(PHY_CTRL_INDATA, port));

WARNING: line length of 89 exceeds 80 columns
#199: FILE: drivers/net/mdio/mdio-realtek-rtl9300.c:142:
+static int rtl9300_mdio_write_c22(struct mii_bus *bus, int phy_id, int regnum, u16 value)

WARNING: line length of 94 exceeds 80 columns
#224: FILE: drivers/net/mdio/mdio-realtek-rtl9300.c:167:
+	err = regmap_write(regmap, SMI_ACCESS_PHY_CTRL_2, FIELD_PREP(PHY_CTRL_INDATA, value));

WARNING: line length of 91 exceeds 80 columns
#254: FILE: drivers/net/mdio/mdio-realtek-rtl9300.c:197:
+static int rtl9300_mdio_read_c45(struct mii_bus *bus, int phy_id, int dev_addr, int regnum)

WARNING: line length of 88 exceeds 80 columns
#410: FILE: drivers/net/mdio/mdio-realtek-rtl9300.c:353:
+static int rtl9300_mdiobus_probe_one(struct device *dev, struct rtl9300_mdio_priv *priv,

WARNING: line length of 85 exceeds 80 columns
#432: FILE: drivers/net/mdio/mdio-realtek-rtl9300.c:375:
+		if (fwnode_device_is_compatible(child, "ethernet-phy-ieee802.3-c45"))

WARNING: line length of 84 exceeds 80 columns
#475: FILE: drivers/net/mdio/mdio-realtek-rtl9300.c:418:
+		return dev_err_probe(dev, -EINVAL, "%pfwP missing ethernet-ports\n",

WARNING: line length of 91 exceeds 80 columns
#500: FILE: drivers/net/mdio/mdio-realtek-rtl9300.c:443:
+			return dev_err_probe(dev, -EINVAL, "illegal port number %d\n", pn);

WARNING: line length of 94 exceeds 80 columns
#503: FILE: drivers/net/mdio/mdio-realtek-rtl9300.c:446:
+			return dev_err_probe(dev, -EINVAL, "duplicated port number %d\n", pn);

WARNING: line length of 95 exceeds 80 columns
#510: FILE: drivers/net/mdio/mdio-realtek-rtl9300.c:453:
+			return dev_err_probe(dev, -EINVAL, "illegal smi bus number %d\n", bus);

WARNING: line length of 93 exceeds 80 columns
#557: FILE: drivers/net/mdio/mdio-realtek-rtl9300.c:500:
+		return dev_err_probe(dev, err, "failed to initialise MDIO bus controller\n");

total: 0 errors, 13 warnings, 0 checks, 542 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 4cf5360fd2a7 ("net: mdio: Add RTL9300 MDIO driver") 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, 13 warnings, 0 checks, 542 lines checked