net: of_get_phy_mode: Change API to solve int/unit warnings

Before this change of_get_phy_mode() returned an enum,
phy_interface_t. On error, -ENODEV etc, is returned. If the result of
the function is stored in a variable of type phy_interface_t, and the
compiler has decided to represent this as an unsigned int, comparision
with -ENODEV etc, is a signed vs unsigned comparision.

Fix this problem by changing the API. Make the function return an
error, or 0 on success, and pass a pointer, of type phy_interface_t,
where the phy mode should be stored.

v2:
Return with *interface set to PHY_INTERFACE_MODE_NA on error.
Add error checks to all users of of_get_phy_mode()
Fixup a few reverse christmas tree errors
Fixup a few slightly malformed reverse christmas trees

v3:
Fix 0-day reported errors.

Reported-by: Dan Carpenter <[e-mail]>
Signed-off-by: Andrew Lunn <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/dsa/bcm_sf2.c

···
 				   struct device_node *dn)
 {
 	struct device_node *port;
-	int mode;
 	unsigned int port_num;
+	phy_interface_t mode;
+	int err;
 
 	priv->moca_port = -1;
 
···
 		 * has completed, since they might be turned off at that
 		 * time
 		 */
-		mode = of_get_phy_mode(port);
-		if (mode < 0)
+		err = of_get_phy_mode(port, &mode);
+		if (err)
 			continue;
 
 		if (mode == PHY_INTERFACE_MODE_INTERNAL)

drivers/net/dsa/microchip/ksz_common.c

···
 int ksz_switch_register(struct ksz_device *dev,
 			const struct ksz_dev_ops *ops)
 {
+	phy_interface_t interface;
 	int ret;
 
 	if (dev->pdata)
···
 	 * device tree.
 	 */
 	if (dev->dev->of_node) {
-		ret = of_get_phy_mode(dev->dev->of_node);
-		if (ret >= 0)
-			dev->interface = ret;
+		ret = of_get_phy_mode(dev->dev->of_node, &interface);
+		if (ret == 0)
+			dev->interface = interface;
 		dev->synclko_125 = of_property_read_bool(dev->dev->of_node,
 							 "microchip,synclko-125");
 	}

drivers/net/dsa/mt7530.c

···
 
 	if (!dsa_is_unused_port(ds, 5)) {
 		priv->p5_intf_sel = P5_INTF_SEL_GMAC5;
-		interface = of_get_phy_mode(dsa_to_port(ds, 5)->dn);
+		ret = of_get_phy_mode(dsa_to_port(ds, 5)->dn, &interface);
+		if (ret && ret != -ENODEV)
+			return ret;
 	} else {
 		/* Scan the ethernet nodes. look for GMAC1, lookup used phy */
 		for_each_child_of_node(dn, mac_np) {
···
 
 			phy_node = of_parse_phandle(mac_np, "phy-handle", 0);
 			if (phy_node->parent == priv->dev->of_node->parent) {
-				interface = of_get_phy_mode(mac_np);
+				ret = of_get_phy_mode(mac_np, &interface);
+				if (ret && ret != -ENODEV)
+					return ret;
 				id = of_mdio_parse_addr(ds->dev, phy_node);
 				if (id == 0)
 					priv->p5_intf_sel = P5_INTF_SEL_PHY_P0;

drivers/net/dsa/qca8k.c

···
 qca8k_setup(struct dsa_switch *ds)
 {
 	struct qca8k_priv *priv = (struct qca8k_priv *)ds->priv;
-	int ret, i, phy_mode = -1;
+	phy_interface_t phy_mode = PHY_INTERFACE_MODE_NA;
+	int ret, i;
 	u32 mask;
 
 	/* Make sure that port 0 is the cpu port */
···
 		return ret;
 
 	/* Initialize CPU port pad mode (xMII type, delays...) */
-	phy_mode = of_get_phy_mode(dsa_to_port(ds, QCA8K_CPU_PORT)->dn);
-	if (phy_mode < 0) {
+	ret = of_get_phy_mode(dsa_to_port(ds, QCA8K_CPU_PORT)->dn, &phy_mode);
+	if (ret) {
 		pr_err("Can't find phy-mode for master device\n");
-		return phy_mode;
+		return ret;
 	}
 	ret = qca8k_set_pad_ctrl(priv, QCA8K_CPU_PORT, phy_mode);
 	if (ret < 0)

drivers/net/dsa/sja1105/sja1105_main.c

···
 
 	for_each_child_of_node(ports_node, child) {
 		struct device_node *phy_node;
-		int phy_mode;
+		phy_interface_t phy_mode;
 		u32 index;
+		int err;
 
 		/* Get switch port number from DT */
 		if (of_property_read_u32(child, "reg", &index) < 0) {
···
 		}
 
 		/* Get PHY mode from DT */
-		phy_mode = of_get_phy_mode(child);
-		if (phy_mode < 0) {
+		err = of_get_phy_mode(child, &phy_mode);
+		if (err) {
 			dev_err(dev, "Failed to read phy-mode or "
 				"phy-interface-type property for port %d\n",
 				index);

drivers/net/ethernet/altera/altera_tse_main.c

···
 {
 	struct altera_tse_private *priv = netdev_priv(dev);
 	struct device_node *np = priv->device->of_node;
-	int ret = 0;
+	int ret;
 
-	priv->phy_iface = of_get_phy_mode(np);
+	ret = of_get_phy_mode(np, &priv->phy_iface);
 
 	/* Avoid get phy addr and create mdio if no phy is present */
-	if (!priv->phy_iface)
+	if (ret)
 		return 0;
 
 	/* try to get PHY address from device tree, use PHY autodetection if

drivers/net/ethernet/arc/emac_arc.c

···
 static int emac_arc_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
-	struct net_device *ndev;
 	struct arc_emac_priv *priv;
-	int interface, err;
+	phy_interface_t interface;
+	struct net_device *ndev;
+	int err;
 
 	if (!dev->of_node)
 		return -ENODEV;
···
 	priv->drv_name = DRV_NAME;
 	priv->drv_version = DRV_VERSION;
 
-	interface = of_get_phy_mode(dev->of_node);
-	if (interface < 0)
-		interface = PHY_INTERFACE_MODE_MII;
+	err = of_get_phy_mode(dev->of_node, &interface);
+	if (err) {
+		if (err == -ENODEV)
+			interface = PHY_INTERFACE_MODE_MII;
+		else
+			goto out_netdev;
+	}
 
 	priv->clk = devm_clk_get(dev, "hclk");
 	if (IS_ERR(priv->clk)) {

drivers/net/ethernet/arc/emac_rockchip.c

···
 	struct net_device *ndev;
 	struct rockchip_priv_data *priv;
 	const struct of_device_id *match;
+	phy_interface_t interface;
 	u32 data;
-	int err, interface;
+	int err;
 
 	if (!pdev->dev.of_node)
 		return -ENODEV;
···
 	priv->emac.drv_version = DRV_VERSION;
 	priv->emac.set_mac_speed = emac_rockchip_set_mac_speed;
 
-	interface = of_get_phy_mode(dev->of_node);
+	err = of_get_phy_mode(dev->of_node, &interface);
+	if (err)
+		goto out_netdev;
 
 	/* RK3036/RK3066/RK3188 SoCs only support RMII */
 	if (interface != PHY_INTERFACE_MODE_RMII) {

drivers/net/ethernet/atheros/ag71xx.c

···
 		eth_random_addr(ndev->dev_addr);
 	}
 
-	ag->phy_if_mode = of_get_phy_mode(np);
-	if (ag->phy_if_mode < 0) {
+	err = of_get_phy_mode(np, ag->phy_if_mode);
+	if (err) {
 		netif_err(ag, probe, ndev, "missing phy-mode property in DT\n");
-		err = ag->phy_if_mode;
 		goto err_free;
 	}
 

drivers/net/ethernet/aurora/nb8800.c

···
 	priv = netdev_priv(dev);
 	priv->base = base;
 
-	priv->phy_mode = of_get_phy_mode(pdev->dev.of_node);
-	if (priv->phy_mode < 0)
+	ret = of_get_phy_mode(pdev->dev.of_node, &priv->phy_mode);
+	if (ret)
 		priv->phy_mode = PHY_INTERFACE_MODE_RGMII;
 
 	priv->clk = devm_clk_get(&pdev->dev, NULL);

drivers/net/ethernet/aurora/nb8800.h

···
 	struct device_node		*phy_node;
 
 	/* PHY connection type from DT */
-	int				phy_mode;
+	phy_interface_t			phy_mode;
 
 	/* Current link status */
 	int				speed;

drivers/net/ethernet/broadcom/bcmsysport.c

···
 	priv->netdev = dev;
 	priv->pdev = pdev;
 
-	priv->phy_interface = of_get_phy_mode(dn);
+	ret = of_get_phy_mode(dn, &priv->phy_interface);
 	/* Default to GMII interface mode */
-	if ((int)priv->phy_interface < 0)
+	if (ret)
 		priv->phy_interface = PHY_INTERFACE_MODE_GMII;
 
 	/* In the case of a fixed PHY, the DT node associated

drivers/net/ethernet/broadcom/genet/bcmmii.c

···
 	struct device_node *dn = priv->pdev->dev.of_node;
 	struct device *kdev = &priv->pdev->dev;
 	struct phy_device *phydev;
-	int phy_mode;
+	phy_interface_t phy_mode;
 	int ret;
 
 	/* Fetch the PHY phandle */
···
 	}
 
 	/* Get the link mode */
-	phy_mode = of_get_phy_mode(dn);
-	if (phy_mode < 0) {
+	ret = of_get_phy_mode(dn, &phy_mode);
+	if (ret) {
 		dev_err(kdev, "invalid PHY mode property\n");
-		return phy_mode;
+		return ret;
 	}
 
 	priv->phy_interface = phy_mode;

drivers/net/ethernet/cadence/macb_main.c

···
 	unsigned int queue_mask, num_queues;
 	bool native_io;
 	struct phy_device *phydev;
+	phy_interface_t interface;
 	struct net_device *dev;
 	struct resource *regs;
 	void __iomem *mem;
···
 		macb_get_hwaddr(bp);
 	}
 
-	err = of_get_phy_mode(np);
-	if (err < 0)
+	err = of_get_phy_mode(np, &interface);
+	if (err)
 		/* not found in DT, MII by default */
 		bp->phy_interface = PHY_INTERFACE_MODE_MII;
 	else
-		bp->phy_interface = err;
+		bp->phy_interface = interface;
 
 	/* IP specific init */
 	err = init(pdev);

drivers/net/ethernet/faraday/ftgmac100.c

···
 {
 	struct ftgmac100 *priv = netdev_priv(netdev);
 	struct platform_device *pdev = to_platform_device(priv->dev);
-	int phy_intf = PHY_INTERFACE_MODE_RGMII;
+	phy_interface_t phy_intf = PHY_INTERFACE_MODE_RGMII;
 	struct device_node *np = pdev->dev.of_node;
 	int i, err = 0;
 	u32 reg;
···
 	/* Get PHY mode from device-tree */
 	if (np) {
 		/* Default to RGMII. It's a gigabit part after all */
-		phy_intf = of_get_phy_mode(np);
-		if (phy_intf < 0)
+		err = of_get_phy_mode(np, &phy_intf);
+		if (err)
 			phy_intf = PHY_INTERFACE_MODE_RGMII;
 
 		/* Aspeed only supports these. I don't know about other IP

drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.c

···
 static int dpaa2_mac_get_if_mode(struct device_node *node,
 				 struct dpmac_attr attr)
 {
-	int if_mode;
+	phy_interface_t if_mode;
+	int err;
 
-	if_mode = of_get_phy_mode(node);
-	if (if_mode >= 0)
+	err = of_get_phy_mode(node, &if_mode);
+	if (!err)
 		return if_mode;
 
 	if_mode = phy_mode(attr.eth_if);

drivers/net/ethernet/freescale/enetc/enetc_pf.c

···
 		}
 	}
 
-	priv->if_mode = of_get_phy_mode(np);
-	if ((int)priv->if_mode < 0) {
+	err = of_get_phy_mode(np, &priv->if_mode);
+	if (err) {
 		dev_err(priv->dev, "missing phy type\n");
 		of_node_put(priv->phy_node);
 		if (of_phy_is_fixed_link(np))

drivers/net/ethernet/freescale/fec_main.c

···
 {
 	struct fec_enet_private *fep;
 	struct fec_platform_data *pdata;
+	phy_interface_t interface;
 	struct net_device *ndev;
 	int i, irq, ret = 0;
 	const struct of_device_id *of_id;
···
 	}
 	fep->phy_node = phy_node;
 
-	ret = of_get_phy_mode(pdev->dev.of_node);
-	if (ret < 0) {
+	ret = of_get_phy_mode(pdev->dev.of_node, &interface);
+	if (ret) {
 		pdata = dev_get_platdata(&pdev->dev);
 		if (pdata)
 			fep->phy_interface = pdata->phy;
 		else
 			fep->phy_interface = PHY_INTERFACE_MODE_MII;
 	} else {
-		fep->phy_interface = ret;
+		fep->phy_interface = interface;
 	}
 
 	fep->clk_ipg = devm_clk_get(&pdev->dev, "ipg");

drivers/net/ethernet/freescale/fman/mac.c

···
 	const u8		*mac_addr;
 	u32			 val;
 	u8			fman_id;
-	int			phy_if;
+	phy_interface_t          phy_if;
 
 	dev = &_of_dev->dev;
 	mac_node = dev->of_node;
···
 	}
 
 	/* Get the PHY connection type */
-	phy_if = of_get_phy_mode(mac_node);
-	if (phy_if < 0) {
+	err = of_get_phy_mode(mac_node, &phy_if);
+	if (err) {
 		dev_warn(dev,
 			 "of_get_phy_mode() for %pOF failed. Defaulting to SGMII\n",
 			 mac_node);

drivers/net/ethernet/freescale/gianfar.c

···
 	const char *model;
 	const void *mac_addr;
 	int err = 0, i;
+	phy_interface_t interface;
 	struct net_device *dev = NULL;
 	struct gfar_private *priv = NULL;
 	struct device_node *np = ofdev->dev.of_node;
···
 	 * rgmii-id really needs to be specified. Other types can be
 	 * detected by hardware
 	 */
-	err = of_get_phy_mode(np);
-	if (err >= 0)
-		priv->interface = err;
+	err = of_get_phy_mode(np, &interface);
+	if (!err)
+		priv->interface = interface;
 	else
 		priv->interface = gfar_get_interface(dev);
 

drivers/net/ethernet/hisilicon/hip04_eth.c

···
 #if defined(CONFIG_HI13X1_GMAC)
 	void __iomem *sysctrl_base;
 #endif
-	int phy_mode;
+	phy_interface_t phy_mode;
 	int chan;
 	unsigned int port;
 	unsigned int group;
···
 		goto init_fail;
 	}
 
-	priv->phy_mode = of_get_phy_mode(node);
-	if (priv->phy_mode < 0) {
+	ret = of_get_phy_mode(node, &priv->phy_mode);
+	if (ret) {
 		dev_warn(d, "not find phy-mode\n");
-		ret = -EINVAL;
 		goto init_fail;
 	}
 

drivers/net/ethernet/hisilicon/hix5hd2_gmac.c

···
 	if (ret)
 		goto err_free_mdio;
 
-	priv->phy_mode = of_get_phy_mode(node);
-	if ((int)priv->phy_mode < 0) {
+	ret = of_get_phy_mode(node, &priv->phy_mode);
+	if (ret) {
 		netdev_err(ndev, "not find phy-mode\n");
-		ret = -EINVAL;
 		goto err_mdiobus;
 	}
 

drivers/net/ethernet/ibm/emac/core.c

···
 {
 	struct device_node *np = dev->ofdev->dev.of_node;
 	const void *p;
+	int err;
 
 	/* Read config from device-tree */
 	if (emac_read_uint_prop(np, "mal-device", &dev->mal_ph, 1))
···
 		dev->mal_burst_size = 256;
 
 	/* PHY mode needs some decoding */
-	dev->phy_mode = of_get_phy_mode(np);
-	if (dev->phy_mode < 0)
+	err = of_get_phy_mode(np, &dev->phy_mode);
+	if (err)
 		dev->phy_mode = PHY_INTERFACE_MODE_NA;
 
 	/* Check EMAC version */

drivers/net/ethernet/marvell/mv643xx_eth.c

···
 static int get_phy_mode(struct mv643xx_eth_private *mp)
 {
 	struct device *dev = mp->dev->dev.parent;
-	int iface = -1;
+	phy_interface_t iface;
+	int err;
 
 	if (dev->of_node)
-		iface = of_get_phy_mode(dev->of_node);
+		err = of_get_phy_mode(dev->of_node, &iface);
 
 	/* Historical default if unspecified. We could also read/write
 	 * the interface state in the PSC1
 	 */
-	if (iface < 0)
+	if (!dev->of_node || err)
 		iface = PHY_INTERFACE_MODE_GMII;
 	return iface;
 }

drivers/net/ethernet/marvell/mvneta.c

···
 	struct phy *comphy;
 	const char *dt_mac_addr;
 	char hw_mac_addr[ETH_ALEN];
+	phy_interface_t phy_mode;
 	const char *mac_from;
 	int tx_csum_limit;
-	int phy_mode;
 	int err;
 	int cpu;
 
···
 	if (dev->irq == 0)
 		return -EINVAL;
 
-	phy_mode = of_get_phy_mode(dn);
-	if (phy_mode < 0) {
+	err = of_get_phy_mode(dn, &phy_mode);
+	if (err) {
 		dev_err(&pdev->dev, "incorrect phy-mode\n");
-		err = -EINVAL;
 		goto err_free_irq;
 	}
 

drivers/net/ethernet/marvell/pxa168_eth.c

···
 			goto err_netdev;
 		}
 		of_property_read_u32(np, "reg", &pep->phy_addr);
-		pep->phy_intf = of_get_phy_mode(pdev->dev.of_node);
 		of_node_put(np);
+		err = of_get_phy_mode(pdev->dev.of_node, &pep->phy_intf);
+		if (err && err != -ENODEV)
+			goto err_netdev;
 	}
 
 	/* Hardware supports only 3 ports */

drivers/net/ethernet/mediatek/mtk_eth_soc.c

···
 static int mtk_add_mac(struct mtk_eth *eth, struct device_node *np)
 {
 	const __be32 *_id = of_get_property(np, "reg", NULL);
+	phy_interface_t phy_mode;
 	struct phylink *phylink;
-	int phy_mode, id, err;
 	struct mtk_mac *mac;
+	int id, err;
 
 	if (!_id) {
 		dev_err(eth->dev, "missing mac id\n");
···
 	mac->hw_stats->reg_offset = id * MTK_STAT_OFFSET;
 
 	/* phylink create */
-	phy_mode = of_get_phy_mode(np);
-	if (phy_mode < 0) {
+	err = of_get_phy_mode(np, &phy_mode);
+	if (err) {
 		dev_err(eth->dev, "incorrect phy-mode\n");
-		err = -EINVAL;
 		goto free_netdev;
 	}
 

drivers/net/ethernet/mscc/ocelot_board.c

···
 
 	for_each_available_child_of_node(ports, portnp) {
 		struct device_node *phy_node;
+		phy_interface_t phy_mode;
 		struct phy_device *phy;
 		struct resource *res;
 		struct phy *serdes;
 		void __iomem *regs;
 		char res_name[8];
-		int phy_mode;
 		u32 port;
 
 		if (of_property_read_u32(portnp, "reg", &port))
···
 			goto out_put_ports;
 		}
 
-		phy_mode = of_get_phy_mode(portnp);
-		if (phy_mode < 0)
-			ocelot->ports[port]->phy_mode = PHY_INTERFACE_MODE_NA;
-		else
-			ocelot->ports[port]->phy_mode = phy_mode;
+		err = of_get_phy_mode(portnp, &phy_mode);
+		if (err && err != -ENODEV)
+			goto out_put_ports;
+
+		ocelot->ports[port]->phy_mode = phy_mode;
 
 		switch (ocelot->ports[port]->phy_mode) {
 		case PHY_INTERFACE_MODE_NA:

drivers/net/ethernet/ni/nixge.c

···
 		}
 	}
 
-	priv->phy_mode = of_get_phy_mode(pdev->dev.of_node);
-	if ((int)priv->phy_mode < 0) {
+	err = of_get_phy_mode(pdev->dev.of_node, &priv->phy_mode);
+	if (err) {
 		netdev_err(ndev, "not find \"phy-mode\" property\n");
-		err = -EINVAL;
 		goto unregister_mdio;
 	}
 

drivers/net/ethernet/renesas/ravb_main.c

···
 	spin_lock_init(&priv->lock);
 	INIT_WORK(&priv->work, ravb_tx_timeout_work);
 
-	priv->phy_interface = of_get_phy_mode(np);
+	error = of_get_phy_mode(np, &priv->phy_interface);
+	if (error && error != -ENODEV)
+		goto out_release;
 
 	priv->no_avb_link = of_property_read_bool(np, "renesas,no-ether-link");
 	priv->avb_link_active_low =

drivers/net/ethernet/renesas/sh_eth.c

···
 {
 	struct device_node *np = dev->of_node;
 	struct sh_eth_plat_data *pdata;
+	phy_interface_t interface;
 	const char *mac_addr;
 	int ret;
 
···
 	if (!pdata)
 		return NULL;
 
-	ret = of_get_phy_mode(np);
-	if (ret < 0)
+	ret = of_get_phy_mode(np, &interface);
+	if (ret)
 		return NULL;
-	pdata->phy_interface = ret;
+	pdata->phy_interface = interface;
 
 	mac_addr = of_get_mac_address(np);
 	if (!IS_ERR(mac_addr))

drivers/net/ethernet/samsung/sxgbe/sxgbe_platform.c

···
 {
 	struct device_node *np = pdev->dev.of_node;
 	struct sxgbe_dma_cfg *dma_cfg;
+	int err;
 
 	if (!np)
 		return -ENODEV;
 
 	*mac = of_get_mac_address(np);
-	plat->interface = of_get_phy_mode(np);
+	err = of_get_phy_mode(np, &plat->interface);
+	if (err && err != -ENODEV)
+		return err;
 
 	plat->bus_id = of_alias_get_id(np, "ethernet");
 	if (plat->bus_id < 0)

drivers/net/ethernet/socionext/sni_ave.c

···
 		return -EINVAL;
 
 	np = dev->of_node;
-	phy_mode = of_get_phy_mode(np);
-	if ((int)phy_mode < 0) {
+	ret = of_get_phy_mode(np, &phy_mode);
+	if (ret) {
 		dev_err(dev, "phy-mode not found\n");
-		return -EINVAL;
+		return ret;
 	}
 
 	irq = platform_get_irq(pdev, 0);

drivers/net/ethernet/stmicro/stmmac/dwmac-anarion.c

···
 
 static struct anarion_gmac *anarion_config_dt(struct platform_device *pdev)
 {
-	int phy_mode;
-	void __iomem *ctl_block;
 	struct anarion_gmac *gmac;
+	phy_interface_t phy_mode;
+	void __iomem *ctl_block;
+	int err;
 
 	ctl_block = devm_platform_ioremap_resource(pdev, 1);
 	if (IS_ERR(ctl_block)) {
···
 
 	gmac->ctl_block = (uintptr_t)ctl_block;
 
-	phy_mode = of_get_phy_mode(pdev->dev.of_node);
+	err = of_get_phy_mode(pdev->dev.of_node, &phy_mode);
+	if (err)
+		return ERR_PTR(err);
+
 	switch (phy_mode) {
 	case PHY_INTERFACE_MODE_RGMII:		/* Fall through */
 	case PHY_INTERFACE_MODE_RGMII_ID	/* Fall through */:

drivers/net/ethernet/stmicro/stmmac/dwmac-ipq806x.c

···
 static int ipq806x_gmac_of_parse(struct ipq806x_gmac *gmac)
 {
 	struct device *dev = &gmac->pdev->dev;
+	int ret;
 
-	gmac->phy_mode = of_get_phy_mode(dev->of_node);
-	if ((int)gmac->phy_mode < 0) {
+	ret = of_get_phy_mode(dev->of_node, &gmac->phy_mode);
+	if (ret) {
 		dev_err(dev, "missing phy mode property\n");
 		return -EINVAL;
 	}

drivers/net/ethernet/stmicro/stmmac/dwmac-mediatek.c

···
 	struct device_node *np;
 	struct regmap *peri_regmap;
 	struct device *dev;
-	int phy_mode;
+	phy_interface_t phy_mode;
 	bool rmii_rxc;
 };
 
···
 {
 	struct mac_delay_struct *mac_delay = &plat->mac_delay;
 	u32 tx_delay_ps, rx_delay_ps;
+	int err;
 
 	plat->peri_regmap = syscon_regmap_lookup_by_phandle(plat->np, "mediatek,pericfg");
 	if (IS_ERR(plat->peri_regmap)) {
···
 		return PTR_ERR(plat->peri_regmap);
 	}
 
-	plat->phy_mode = of_get_phy_mode(plat->np);
-	if (plat->phy_mode < 0) {
+	err = of_get_phy_mode(plat->np, &plat->phy_mode);
+	if (err) {
 		dev_err(plat->dev, "not find phy-mode\n");
-		return -EINVAL;
+		return err;
 	}
 
 	if (!of_property_read_u32(plat->np, "mediatek,tx-delay-ps", &tx_delay_ps)) {

drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c

···
 	}
 
 	dwmac->dev = &pdev->dev;
-	dwmac->phy_mode = of_get_phy_mode(pdev->dev.of_node);
-	if ((int)dwmac->phy_mode < 0) {
+	ret = of_get_phy_mode(pdev->dev.of_node, &dwmac->phy_mode);
+	if (ret) {
 		dev_err(&pdev->dev, "missing phy-mode property\n");
-		ret = -EINVAL;
 		goto err_remove_config_dt;
 	}
 

drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c

···
 
 struct rk_priv_data {
 	struct platform_device *pdev;
-	int phy_iface;
+	phy_interface_t phy_iface;
 	struct regulator *regulator;
 	bool suspended;
 	const struct rk_gmac_ops *ops;
···
 	if (!bsp_priv)
 		return ERR_PTR(-ENOMEM);
 
-	bsp_priv->phy_iface = of_get_phy_mode(dev->of_node);
+	of_get_phy_mode(dev->of_node, &bsp_priv->phy_iface);
 	bsp_priv->ops = ops;
 
 	bsp_priv->regulator = devm_regulator_get_optional(dev, "phy");

drivers/net/ethernet/stmicro/stmmac/dwmac-sti.c

···
 #define ETH_PHY_SEL_MII		0x0
 
 struct sti_dwmac {
-	int interface;		/* MII interface */
+	phy_interface_t interface;	/* MII interface */
 	bool ext_phyclk;	/* Clock from external PHY */
 	u32 tx_retime_src;	/* TXCLK Retiming*/
 	struct clk *clk;	/* PHY clock */
···
 		return err;
 	}
 
-	dwmac->interface = of_get_phy_mode(np);
+	err = of_get_phy_mode(np, &dwmac->interface);
+	if (err && err != -ENODEV) {
+		dev_err(dev, "Can't get phy-mode\n");
+		return err;
+	}
+
 	dwmac->regmap = regmap;
 	dwmac->gmac_en = of_property_read_bool(np, "st,gmac_en");
 	dwmac->ext_phyclk = of_property_read_bool(np, "st,ext-phyclk");

drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c

···
 	struct stmmac_resources stmmac_res;
 	struct sunxi_priv_data *gmac;
 	struct device *dev = &pdev->dev;
+	phy_interface_t interface;
 	int ret;
 	struct stmmac_priv *priv;
 	struct net_device *ndev;
···
 		return ret;
 	}
 
-	ret = of_get_phy_mode(dev->of_node);
-	if (ret < 0)
+	ret = of_get_phy_mode(dev->of_node, &interface);
+	if (ret)
 		return -EINVAL;
-	plat_dat->interface = ret;
+	plat_dat->interface = interface;
 
 	/* platform data specifying hardware features and callbacks.
 	 * hardware features were copied from Allwinner drivers.

drivers/net/ethernet/stmicro/stmmac/dwmac-sunxi.c

···
 #include "stmmac_platform.h"
 
 struct sunxi_priv_data {
-	int interface;
+	phy_interface_t interface;
 	int clk_enabled;
 	struct clk *tx_clk;
 	struct regulator *regulator;
···
 		goto err_remove_config_dt;
 	}
 
-	gmac->interface = of_get_phy_mode(dev->of_node);
+	ret = of_get_phy_mode(dev->of_node, &gmac->interface);
+	if (ret && ret != -ENODEV) {
+		dev_err(dev, "Can't get phy-mode\n");
+		goto err_remove_config_dt;
+	}
 
 	gmac->tx_clk = devm_clk_get(dev, "allwinner_gmac_tx");
 	if (IS_ERR(gmac->tx_clk)) {

drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c

···
 		*mac = NULL;
 	}
 
-	plat->phy_interface = of_get_phy_mode(np);
-	if (plat->phy_interface < 0)
-		return ERR_PTR(plat->phy_interface);
+	rc = of_get_phy_mode(np, &plat->phy_interface);
+	if (rc)
+		return ERR_PTR(rc);
 
 	plat->interface = stmmac_of_get_mac_mode(np);
 	if (plat->interface < 0)

drivers/net/ethernet/ti/cpsw.c

···
 				i);
 			goto no_phy_slave;
 		}
-		slave_data->phy_if = of_get_phy_mode(slave_node);
-		if (slave_data->phy_if < 0) {
+		ret = of_get_phy_mode(slave_node, &slave_data->phy_if);
+		if (ret) {
 			dev_err(&pdev->dev, "Missing or malformed slave[%d] phy-mode property\n",
 				i);
-			ret = slave_data->phy_if;
 			goto err_node_put;
 		}
 

drivers/net/ethernet/ti/cpsw_priv.h

···
 	struct device_node *slave_node;
 	struct device_node *phy_node;
 	char		phy_id[MII_BUS_ID_SIZE];
-	int		phy_if;
+	phy_interface_t	phy_if;
 	u8		mac_addr[ETH_ALEN];
 	u16		dual_emac_res_vlan;	/* Reserved VLAN for DualEMAC */
 	struct phy	*ifphy;

drivers/net/ethernet/ti/netcp_ethss.c

···
 	struct gbe_slave *slave = gbe_intf->slave;
 	phy_interface_t phy_mode;
 	bool has_phy = false;
+	int err;
 
 	void (*hndlr)(struct net_device *) = gbe_adjust_link;
 
···
 		slave->phy_port_t = PORT_MII;
 	} else if (slave->link_interface == RGMII_LINK_MAC_PHY) {
 		has_phy = true;
-		phy_mode = of_get_phy_mode(slave->node);
+		err = of_get_phy_mode(slave->node, &phy_mode);
 		/* if phy-mode is not present, default to
 		 * PHY_INTERFACE_MODE_RGMII
 		 */
-		if (phy_mode < 0)
+		if (err)
 			phy_mode = PHY_INTERFACE_MODE_RGMII;
 
 		if (!phy_interface_mode_is_rgmii(phy_mode)) {

drivers/net/ethernet/xilinx/xilinx_axienet_main.c

···
 			goto free_netdev;
 		}
 	} else {
-		lp->phy_mode = of_get_phy_mode(pdev->dev.of_node);
-		if ((int)lp->phy_mode < 0) {
-			ret = -EINVAL;
+		ret = of_get_phy_mode(pdev->dev.of_node, &lp->phy_mode);
+		if (ret)
 			goto free_netdev;
-		}
 	}
 
 	/* Find the DMA node, map the DMA registers, and decode the DMA IRQs */

drivers/of/of_mdio.c

···
 	struct phy_device *phy;
 	int ret;
 
-	iface = of_get_phy_mode(np);
-	if ((int)iface < 0)
+	ret = of_get_phy_mode(np, &iface);
+	if (ret)
 		return NULL;
 	if (of_phy_is_fixed_link(np)) {
 		ret = of_phy_register_fixed_link(np);

drivers/of/of_net.c

···
 /**
  * of_get_phy_mode - Get phy mode for given device_node
  * @np:	Pointer to the given device_node
+ * @interface: Pointer to the result
  *
  * The function gets phy interface string from property 'phy-mode' or
- * 'phy-connection-type', and return its index in phy_modes table, or errno in
- * error case.
+ * 'phy-connection-type'. The index in phy_modes table is set in
+ * interface and 0 returned. In case of error interface is set to
+ * PHY_INTERFACE_MODE_NA and an errno is returned, e.g. -ENODEV.
  */
-int of_get_phy_mode(struct device_node *np)
+int of_get_phy_mode(struct device_node *np, phy_interface_t *interface)
 {
 	const char *pm;
 	int err, i;
+
+	*interface = PHY_INTERFACE_MODE_NA;
 
 	err = of_property_read_string(np, "phy-mode", &pm);
 	if (err < 0)
···
 		return err;
 
 	for (i = 0; i < PHY_INTERFACE_MODE_MAX; i++)
-		if (!strcasecmp(pm, phy_modes(i)))
-			return i;
+		if (!strcasecmp(pm, phy_modes(i))) {
+			*interface = i;
+			return 0;
+		}
 
 	return -ENODEV;
 }

include/linux/of_net.h

···
 #ifndef __LINUX_OF_NET_H
 #define __LINUX_OF_NET_H
 
+#include <linux/phy.h>
+
 #ifdef CONFIG_OF_NET
 #include <linux/of.h>
 
 struct net_device;
-extern int of_get_phy_mode(struct device_node *np);
+extern int of_get_phy_mode(struct device_node *np, phy_interface_t *interface);
 extern const void *of_get_mac_address(struct device_node *np);
 extern struct net_device *of_find_net_device_by_node(struct device_node *np);
 #else
-static inline int of_get_phy_mode(struct device_node *np)
+static inline int of_get_phy_mode(struct device_node *np,
+				  phy_interface_t *interface)
 {
 	return -ENODEV;
 }

include/linux/stmmac.h

···
 #define __STMMAC_PLATFORM_DATA
 
 #include <linux/platform_device.h>
+#include <linux/phy.h>
 
 #define MTL_MAX_RX_QUEUES	8
 #define MTL_MAX_TX_QUEUES	8
···
 	int bus_id;
 	int phy_addr;
 	int interface;
-	int phy_interface;
+	phy_interface_t phy_interface;
 	struct stmmac_mdio_bus_data *mdio_bus_data;
 	struct device_node *phy_node;
 	struct device_node *phylink_node;

include/linux/sxgbe_platform.h

···
 #ifndef __SXGBE_PLATFORM_H__
 #define __SXGBE_PLATFORM_H__
 
+#include <linux/phy.h>
+
 /* MDC Clock Selection define*/
 #define SXGBE_CSR_100_150M	0x0	/* MDC = clk_scr_i/62 */
 #define SXGBE_CSR_150_250M	0x1	/* MDC = clk_scr_i/102 */
···
 	char *phy_bus_name;
 	int bus_id;
 	int phy_addr;
-	int interface;
+	phy_interface_t interface;
 	struct sxgbe_mdio_bus_data *mdio_bus_data;
 	struct sxgbe_dma_cfg *dma_cfg;
 	int clk_csr;

net/dsa/port.c

···
 	struct dsa_switch *ds = dp->ds;
 	struct phy_device *phydev;
 	int port = dp->index;
-	int mode;
+	phy_interface_t mode;
 	int err;
 
 	err = of_phy_register_fixed_link(dn);
···
 
 	phydev = of_phy_find_device(dn);
 
-	mode = of_get_phy_mode(dn);
-	if (mode < 0)
+	err = of_get_phy_mode(dn, &mode);
+	if (err)
 		mode = PHY_INTERFACE_MODE_NA;
 	phydev->interface = mode;
 
···
 {
 	struct dsa_switch *ds = dp->ds;
 	struct device_node *port_dn = dp->dn;
-	int mode, err;
+	phy_interface_t mode;
+	int err;
 
-	mode = of_get_phy_mode(port_dn);
-	if (mode < 0)
+	err = of_get_phy_mode(port_dn, &mode);
+	if (err)
 		mode = PHY_INTERFACE_MODE_NA;
 
 	dp->pl_config.dev = ds->dev;

net/dsa/slave.c

···
 	struct dsa_port *dp = dsa_slave_to_port(slave_dev);
 	struct device_node *port_dn = dp->dn;
 	struct dsa_switch *ds = dp->ds;
+	phy_interface_t mode;
 	u32 phy_flags = 0;
-	int mode, ret;
+	int ret;
 
-	mode = of_get_phy_mode(port_dn);
-	if (mode < 0)
+	ret = of_get_phy_mode(port_dn, &mode);
+	if (ret)
 		mode = PHY_INTERFACE_MODE_NA;
 
 	dp->pl_config.dev = &slave_dev->dev;