Re: [PATCH net-next 4/4] net-next: dsa: add dsa support for Mediatek MT7530 switch

[kbuild test robot <lkp@intel.com>]

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Hi Sean,

[auto build test WARNING on robh/for-next]
[also build test WARNING on v4.11-rc2 next-20170310]
[cannot apply to net-next/master net/master]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/sean-wang-mediatek-com/dt-bindings-net-dsa-add-Mediatek-MT7530-binding/20170315-083834
base:   https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git for-next
config: i386-allmodconfig (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All warnings (new ones prefixed by >>):

   drivers/net/dsa/mt7530.c: In function 'mt7530_probe':
   drivers/net/dsa/mt7530.c:1076:27: warning: unused variable 'mdio' [-Wunused-variable]
     struct device_node *dn, *mdio;
                              ^~~~
   drivers/net/dsa/mt7530.c: In function 'mt7530_remove':
>> drivers/net/dsa/mt7530.c:1173:9: warning: 'return' with a value, in function returning void
     return ret;
            ^~~
   drivers/net/dsa/mt7530.c:1153:1: note: declared here
    mt7530_remove(struct mdio_device *mdiodev)
    ^~~~~~~~~~~~~

vim +/return +1173 drivers/net/dsa/mt7530.c

  1070	};
  1071	
  1072	static int
  1073	mt7530_probe(struct mdio_device *mdiodev)
  1074	{
  1075		struct mt7530_priv *priv;
> 1076		struct device_node *dn, *mdio;
  1077		int ret;
  1078		const char *pm;
  1079	
  1080		dn = mdiodev->dev.of_node;
  1081	
  1082		priv = devm_kzalloc(&mdiodev->dev, sizeof(*priv), GFP_KERNEL);
  1083		if (!priv)
  1084			return -ENOMEM;
  1085	
  1086		priv->ds = devm_kzalloc(&mdiodev->dev, sizeof(*priv->ds), GFP_KERNEL);
  1087		if (!priv->ds)
  1088			return -ENOMEM;
  1089	
  1090		/* Use medatek,mcm property to distinguish hardware type that would
  1091		 * casues a little bit differences on power-on sequence.
  1092		 */
  1093		ret = of_property_read_string(dn, "mediatek,mcm", &pm);
  1094		if (!ret && !strcasecmp(pm, "enabled")) {
  1095			priv->mcm = true;
  1096			dev_info(&mdiodev->dev, "MT7530 adapts as multi-chip module\n");
  1097		}
  1098	
  1099		priv->core_pwr = devm_regulator_get(&mdiodev->dev, "core");
  1100		if (IS_ERR(priv->core_pwr))
  1101			return PTR_ERR(priv->core_pwr);
  1102	
  1103		priv->io_pwr = devm_regulator_get(&mdiodev->dev, "io");
  1104		if (IS_ERR(priv->io_pwr))
  1105			return PTR_ERR(priv->io_pwr);
  1106	
  1107		/* MT7530 shares the certain address space with Mediatek Ethernet
  1108		 * driver for controling TRGMII. Here we create syscon regmap for
  1109		 * access and control these parameters up on TRGMII.
  1110		 */
  1111		priv->ethsys = syscon_regmap_lookup_by_phandle(dn,
  1112							       "mediatek,ethsys");
  1113		if (IS_ERR(priv->ethsys))
  1114			return PTR_ERR(priv->ethsys);
  1115	
  1116		priv->ethernet = syscon_regmap_lookup_by_phandle(dn,
  1117							       "mediatek,ethernet");
  1118		if (IS_ERR(priv->ethernet))
  1119			return PTR_ERR(priv->ethernet);
  1120	
  1121		/* Not MCM that indicates switch works as the remote standalone
  1122		 * integrated circuit so the GPIO pin would be used to complete
  1123		 * the reset, otherwise memory-mapped register accessing used
  1124		 * through syscon provides in the case of MCM.
  1125		 */
  1126		if (!priv->mcm) {
  1127			priv->reset = of_get_named_gpio(dn, "mediatek,reset-pin", 0);
  1128			if (!gpio_is_valid(priv->reset))
  1129				return priv->reset;
  1130	
  1131			ret = devm_gpio_request_one(&mdiodev->dev,
  1132						    priv->reset, GPIOF_OUT_INIT_LOW,
  1133						    "mediatek,reset-pin");
  1134			if (ret < 0) {
  1135				dev_err(&mdiodev->dev,
  1136					"fail to devm_gpio_request reset\n");
  1137				return ret;
  1138			}
  1139		}
  1140	
  1141		priv->bus = mdiodev->bus;
  1142		priv->dev = &mdiodev->dev;
  1143		priv->ds->priv = priv;
  1144		priv->ds->dev = &mdiodev->dev;
  1145		priv->ds->ops = &mt7530_switch_ops;
  1146		mutex_init(&priv->reg_mutex);
  1147		dev_set_drvdata(&mdiodev->dev, priv);
  1148	
  1149		return dsa_register_switch(priv->ds, priv->ds->dev->of_node);
  1150	}
  1151	
  1152	static void
  1153	mt7530_remove(struct mdio_device *mdiodev)
  1154	{
  1155		struct mt7530_priv *priv = dev_get_drvdata(&mdiodev->dev);
  1156		int ret = 0;
  1157	
  1158		ret = regulator_disable(priv->core_pwr);
  1159		if (ret < 0) {
  1160			dev_err(priv->dev,
  1161				"Failed to disable core power: %d\n", ret);
  1162			goto err;
  1163		}
  1164	
  1165		ret = regulator_disable(priv->io_pwr);
  1166		if (ret < 0)
  1167			dev_err(&mdiodev->dev, "Failed to disable io pwr: %d\n",
  1168				ret);
  1169	
  1170		dsa_unregister_switch(priv->ds);
  1171		mutex_destroy(&priv->reg_mutex);
  1172	err:
> 1173		return ret;
  1174	}
  1175	
  1176	static const struct of_device_id mt7530_of_match[] = {

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