net: dwc_eth_qos: implement phy reg and max-speed for stm32

Add management of property "reg" to configure @ of phy and
also "max-speed" property to specify maximum speed in Mbit/s
supported by the device
Signed-off-by: NChristophe Roullier <christophe.roullier@st.com>
Reviewed-by: NPatrick DELAUNAY <patrick.delaunay@st.com>
Signed-off-by: NPatrick Delaunay <patrick.delaunay@st.com>

drivers/net/dwc_eth_qos.c

@@ -306,6 +306,8 @@ struct eqos_priv {
 	struct clk clk_slave_bus;
 	struct mii_dev *mii;
 	struct phy_device *phy;
+	int phyaddr;
+	u32 max_speed;
 	void *descs;
 	struct eqos_desc *tx_descs;
 	struct eqos_desc *rx_descs;
@@ -1081,12 +1083,21 @@ static int eqos_start(struct udevice *dev)
 	 * don't need to reconnect/reconfigure again
 	 */
 	if (!eqos->phy) {
-		eqos->phy = phy_connect(eqos->mii, -1, dev,
+		eqos->phy = phy_connect(eqos->mii, eqos->phyaddr, dev,
 					eqos->config->interface(dev));
 		if (!eqos->phy) {
 			pr_err("phy_connect() failed");
 			goto err_stop_resets;
 		}
+
+		if (eqos->max_speed) {
+			ret = phy_set_supported(eqos->phy, eqos->max_speed);
+			if (ret) {
+				pr_err("phy_set_supported() failed: %d", ret);
+				goto err_shutdown_phy;
+			}
+		}
+
 		ret = phy_config(eqos->phy);
 		if (ret < 0) {
 			pr_err("phy_config() failed: %d", ret);
@@ -1654,6 +1665,8 @@ static int eqos_probe_resources_stm32(struct udevice *dev)
 	if (ret)
 		return -EINVAL;
 
+	eqos->max_speed = dev_read_u32_default(dev, "max-speed", 0);
+
 	ret = clk_get_by_name(dev, "stmmaceth", &eqos->clk_master_bus);
 	if (ret) {
 		pr_err("clk_get_by_name(master_bus) failed: %d", ret);
@@ -1677,6 +1690,7 @@ static int eqos_probe_resources_stm32(struct udevice *dev)
 	if (ret)
 		pr_warn("No phy clock provided %d", ret);
 
+	eqos->phyaddr = -1;
 	ret = dev_read_phandle_with_args(dev, "phy-handle", NULL, 0, 0,
 					 &phandle_args);
 	if (!ret) {
@@ -1689,6 +1703,9 @@ static int eqos_probe_resources_stm32(struct udevice *dev)
 		if (ret)
 			pr_warn("gpio_request_by_name(phy reset) not provided %d",
 				ret);
+
+		eqos->phyaddr = ofnode_read_u32_default(phandle_args.node,
+							"reg", -1);
 	}
 
 	debug("%s: OK\n", __func__);