WARNING: please write a help paragraph that fully describes the config symbol
#28: FILE: drivers/net/mdio/Kconfig:188:
+config MDIO_REALTEK_RTL
+	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?
#51: 
new file mode 100644

WARNING: line length of 81 exceeds 80 columns
#105: FILE: drivers/net/mdio/mdio-realtek-rtl.c:50:
+	return regmap_read_poll_timeout(regmap, reg_base + SMI_ACCESS_PHY_CTRL_1,

WARNING: line length of 83 exceeds 80 columns
#121: FILE: drivers/net/mdio/mdio-realtek-rtl.c:66:
+	err = regmap_write(regmap, reg_base + SMI_ACCESS_PHY_CTRL_2, phy_id << 16);

WARNING: line length of 83 exceeds 80 columns
#126: FILE: drivers/net/mdio/mdio-realtek-rtl.c:71:
+			   regnum << 20 |  0x1f << 15 | 0xfff << 3 | PHY_CTRL_CMD);

WARNING: line length of 89 exceeds 80 columns
#141: FILE: drivers/net/mdio/mdio-realtek-rtl.c:86:
+static int realtek_mdio_write_c22(struct mii_bus *bus, int phy_id, int regnum, u16 value)

WARNING: line length of 82 exceeds 80 columns
#153: FILE: drivers/net/mdio/mdio-realtek-rtl.c:98:
+	err = regmap_write(regmap, reg_base + SMI_ACCESS_PHY_CTRL_0, BIT(phy_id));

WARNING: line length of 82 exceeds 80 columns
#157: FILE: drivers/net/mdio/mdio-realtek-rtl.c:102:
+	err = regmap_write(regmap, reg_base + SMI_ACCESS_PHY_CTRL_2, value << 16);

WARNING: line length of 99 exceeds 80 columns
#162: FILE: drivers/net/mdio/mdio-realtek-rtl.c:107:
+			   regnum << 20 |  0x1f << 15 | 0xfff << 3 | PHY_CTRL_RWOP | PHY_CTRL_CMD);

WARNING: line length of 91 exceeds 80 columns
#177: FILE: drivers/net/mdio/mdio-realtek-rtl.c:122:
+static int realtek_mdio_read_c45(struct mii_bus *bus, int phy_id, int dev_addr, int regnum)

WARNING: line length of 83 exceeds 80 columns
#189: FILE: drivers/net/mdio/mdio-realtek-rtl.c:134:
+	err = regmap_write(regmap, reg_base + SMI_ACCESS_PHY_CTRL_2, phy_id << 16);

WARNING: line length of 82 exceeds 80 columns
#227: FILE: drivers/net/mdio/mdio-realtek-rtl.c:172:
+	err = regmap_write(regmap, reg_base + SMI_ACCESS_PHY_CTRL_0, BIT(phy_id));

WARNING: line length of 82 exceeds 80 columns
#231: FILE: drivers/net/mdio/mdio-realtek-rtl.c:176:
+	err = regmap_write(regmap, reg_base + SMI_ACCESS_PHY_CTRL_2, value << 16);

WARNING: line length of 91 exceeds 80 columns
#343: FILE: drivers/net/mdio/mdio-realtek-rtl.c:288:
+			return dev_err_probe(dev, -EINVAL, "illegal port number %d\n", pn);

WARNING: line length of 96 exceeds 80 columns
#345: FILE: drivers/net/mdio/mdio-realtek-rtl.c:290:
+		err = fwnode_property_read_u32_array(child, "realtek,smi-address", smi_addr, 2);

WARNING: line length of 89 exceeds 80 columns
#352: FILE: drivers/net/mdio/mdio-realtek-rtl.c:297:
+			return dev_err_probe(dev, -EINVAL, "illegal smi bus number %d\n",

WARNING: line length of 97 exceeds 80 columns
#356: FILE: drivers/net/mdio/mdio-realtek-rtl.c:301:
+			return dev_err_probe(dev, -EINVAL, "illegal smi addr %d\n", smi_addr[1]);

WARNING: line length of 85 exceeds 80 columns
#358: FILE: drivers/net/mdio/mdio-realtek-rtl.c:303:
+		if (fwnode_device_is_compatible(child, "ethernet-phy-ieee802.3-c45"))

WARNING: line length of 93 exceeds 80 columns
#367: FILE: drivers/net/mdio/mdio-realtek-rtl.c:312:
+		return dev_err_probe(dev, err, "failed to initialise MDIO bus controller\n");

total: 0 errors, 19 warnings, 0 checks, 361 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 554bc99669f1 ("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, 19 warnings, 0 checks, 361 lines checked