boards: xtensa/esp32_ethernet_kit: Add Ethernet support

Configures ESP32 Ethernet support for the esp32_ethernet_kit board

Signed-off-by: Grant Ramsay <grant.ramsay@hotmail.com>

boards/xtensa/esp32_ethernet_kit/doc/index.rst

@@ -495,6 +495,30 @@ You can debug an application in the usual way. Here is an example for the :ref:`
    :board: esp32_ethernet_kit
    :goals: debug
 
+
+Enabling Ethernet
+-----------------
+
+Enable Ethernet MAC, PHY and MDIO; add these to your device tree overlay::
+
+    &eth {
+        status = "okay";
+    };
+
+    &phy {
+        status = "okay";
+    };
+
+    &mdio {
+        status = "okay";
+    };
+
+Enable Ethernet in KConfig::
+
+    CONFIG_ETH_ESP32=y
+    CONFIG_NETWORKING=y
+    CONFIG_NET_L2_ETHERNET=y
+
 Board Init
 -----------------
 

boards/xtensa/esp32_ethernet_kit/esp32_ethernet_kit-pinctrl.dtsi

@@ -32,4 +32,11 @@
 		};
 	};
 
+	mdio_default: mdio_default {
+		group1 {
+			pinmux = <SMI_MDC_GPIO23>,
+				 <SMI_MDIO_GPIO18>;
+		};
+	};
+
 };

boards/xtensa/esp32_ethernet_kit/esp32_ethernet_kit.dts

@@ -114,3 +114,17 @@
 		};
 	};
 };
+
+&eth {
+	phy: phy {
+		compatible = "ethernet-phy";
+		status = "disabled";
+		address = <1>;
+		mdio = <&mdio>;
+	};
+};
+
+&mdio {
+	pinctrl-0 = <&mdio_default>;
+	pinctrl-names = "default";
+};