diff --git a/arch/arm64/boot/dts/ti/Makefile b/arch/arm64/boot/dts/ti/Makefile
index c76b41f86527..08c974b05616 100644
--- a/arch/arm64/boot/dts/ti/Makefile
+++ b/arch/arm64/boot/dts/ti/Makefile
@@ -44,6 +44,7 @@ k3-am642-hummingboard-t-usb3-dtbs := \
 	k3-am642-hummingboard-t.dtb k3-am642-hummingboard-t-usb3.dtbo
 dtb-$(CONFIG_ARCH_K3) += k3-am642-evm.dtb
 dtb-$(CONFIG_ARCH_K3) += k3-am642-evm-icssg1-dualemac.dtbo
+dtb-$(CONFIG_ARCH_K3) += k3-am642-evm-icssg1-dualemac-mii.dtbo
 dtb-$(CONFIG_ARCH_K3) += k3-am642-hummingboard-t.dtb
 dtb-$(CONFIG_ARCH_K3) += k3-am642-hummingboard-t-pcie.dtb
 dtb-$(CONFIG_ARCH_K3) += k3-am642-hummingboard-t-usb3.dtb
@@ -132,6 +133,8 @@ k3-am62p5-sk-csi2-tevi-ov5640-dtbs := k3-am62p5-sk.dtb \
 	k3-am62x-sk-csi2-tevi-ov5640.dtbo
 k3-am642-evm-icssg1-dualemac-dtbs := \
 	k3-am642-evm.dtb k3-am642-evm-icssg1-dualemac.dtbo
+k3-am642-evm-icssg1-dualemac-mii-dtbs := \
+	k3-am642-evm.dtb k3-am642-evm-icssg1-dualemac-mii.dtbo
 k3-am642-tqma64xxl-mbax4xxl-sdcard-dtbs := \
 	k3-am642-tqma64xxl-mbax4xxl.dtb k3-am64-tqma64xxl-mbax4xxl-sdcard.dtbo
 k3-am642-tqma64xxl-mbax4xxl-wlan-dtbs := \
@@ -160,6 +163,7 @@ dtb- += k3-am625-beagleplay-csi2-ov5640.dtb \
 	k3-am62p5-sk-csi2-ov5640.dtb \
 	k3-am62p5-sk-csi2-tevi-ov5640.dtb \
 	k3-am642-evm-icssg1-dualemac.dtb \
+	k3-am642-evm-icssg1-dualemac-mii.dtb \
 	k3-am642-tqma64xxl-mbax4xxl-sdcard.dtb \
 	k3-am642-tqma64xxl-mbax4xxl-wlan.dtb \
 	k3-am68-sk-base-board-csi2-dual-imx219-dtbs \
diff --git a/arch/arm64/boot/dts/ti/k3-am642-evm-icssg1-dualemac-mii.dtso b/arch/arm64/boot/dts/ti/k3-am642-evm-icssg1-dualemac-mii.dtso
new file mode 100644
index 000000000000..3081b5c64886
--- /dev/null
+++ b/arch/arm64/boot/dts/ti/k3-am642-evm-icssg1-dualemac-mii.dtso
@@ -0,0 +1,101 @@
+// SPDX-License-Identifier: GPL-2.0
+/**
+ * DT overlay for enabling both ICSSG1 port on AM642 EVM in MII mode
+ *
+ * Copyright (C) 2020-2024 Texas Instruments Incorporated - https://www.ti.com/
+ */
+
+/dts-v1/;
+/plugin/;
+#include <dt-bindings/gpio/gpio.h>
+#include "k3-pinctrl.h"
+
+&{/} {
+	aliases {
+		ethernet1 = "/icssg1-eth/ethernet-ports/port@1";
+	};
+
+	mdio-mux-2 {
+		compatible = "mdio-mux-multiplexer";
+		mux-controls = <&mdio_mux>;
+		mdio-parent-bus = <&icssg1_mdio>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		mdio@0 {
+			reg = <0x0>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			icssg1_phy2: ethernet-phy@3 {
+				reg = <3>;
+			};
+		};
+	};
+};
+
+&main_pmx0 {
+	icssg1_mii1_pins_default: icssg1-mii1-default-pins {
+		pinctrl-single,pins = <
+			AM64X_IOPAD(0x00f8, PIN_INPUT, 1) /* (V9) PRG1_PRU0_GPO16.PR1_MII_MT0_CLK */
+			AM64X_IOPAD(0x00f4, PIN_OUTPUT, 0) /* (Y9) PRG1_PRU0_GPO15.PR1_MII0_TXEN */
+			AM64X_IOPAD(0x00f0, PIN_OUTPUT, 0) /* (AA9) PRG1_PRU0_GPO14.PR1_MII0_TXD3 */
+			AM64X_IOPAD(0x00ec, PIN_OUTPUT, 0) /* (W9) PRG1_PRU0_GPO13.PR1_MII0_TXD2 */
+			AM64X_IOPAD(0x00e8, PIN_OUTPUT, 0) /* (U9) PRG1_PRU0_GPO12.PR1_MII0_TXD1 */
+			AM64X_IOPAD(0x00e4, PIN_OUTPUT, 0) /* (AA8) PRG1_PRU0_GPO11.PR1_MII0_TXD0 */
+			AM64X_IOPAD(0x00c8, PIN_INPUT, 1) /* (Y8) PRG1_PRU0_GPO4.PR1_MII0_RXDV */
+			AM64X_IOPAD(0x00d0, PIN_INPUT, 1) /* (AA7) PRG1_PRU0_GPO6.PR1_MII_MR0_CLK */
+			AM64X_IOPAD(0x00c4, PIN_INPUT, 1) /* (V8) PRG1_PRU0_GPO3.PR1_MII0_RXD3 */
+			AM64X_IOPAD(0x00c0, PIN_INPUT, 1) /* (W8) PRG1_PRU0_GPO2.PR1_MII0_RXD2 */
+			AM64X_IOPAD(0x00cc, PIN_INPUT, 1) /* (V13) PRG1_PRU0_GPO5.PR1_MII0_RXER */
+			AM64X_IOPAD(0x00bc, PIN_INPUT, 1) /* (U8) PRG1_PRU0_GPO1.PR1_MII0_RXD1 */
+			AM64X_IOPAD(0x00b8, PIN_INPUT, 1) /* (Y7) PRG1_PRU0_GPO0.PR1_MII0_RXD0 */
+			AM64X_IOPAD(0x00d8, PIN_INPUT, 1) /* (W13) PRG1_PRU0_GPO8.PR1_MII0_RXLINK */
+		>;
+	};
+
+	icssg1_mii2_pins_default: icssg1-mii2-default-pins {
+		pinctrl-single,pins = <
+			AM64X_IOPAD(0x0148, PIN_INPUT, 1) /* (Y10) PRG1_PRU1_GPO16.PR1_MII_MT1_CLK */
+			AM64X_IOPAD(0x0144, PIN_OUTPUT, 0) /* (Y11) PRG1_PRU1_GPO15.PR1_MII1_TXEN */
+			AM64X_IOPAD(0x0140, PIN_OUTPUT, 0) /* (AA11) PRG1_PRU1_GPO14.PR1_MII1_TXD3 */
+			AM64X_IOPAD(0x013c, PIN_OUTPUT, 0) /* (U10) PRG1_PRU1_GPO13.PR1_MII1_TXD2 */
+			AM64X_IOPAD(0x0138, PIN_OUTPUT, 0) /* (V10) PRG1_PRU1_GPO12.PR1_MII1_TXD1 */
+			AM64X_IOPAD(0x0134, PIN_OUTPUT, 0) /* (AA10) PRG1_PRU1_GPO11.PR1_MII1_TXD0 */
+			AM64X_IOPAD(0x0118, PIN_INPUT, 1) /* (W12) PRG1_PRU1_GPO4.PR1_MII1_RXDV */
+			AM64X_IOPAD(0x0120, PIN_INPUT, 1) /* (U11) PRG1_PRU1_GPO6.PR1_MII_MR1_CLK */
+			AM64X_IOPAD(0x0114, PIN_INPUT, 1) /* (Y12) PRG1_PRU1_GPO3.PR1_MII1_RXD3 */
+			AM64X_IOPAD(0x0110, PIN_INPUT, 1) /* (AA12) PRG1_PRU1_GPO2.PR1_MII1_RXD2 */
+			AM64X_IOPAD(0x011c, PIN_INPUT, 1) /* (AA13) PRG1_PRU1_GPO5.PR1_MII1_RXER */
+			AM64X_IOPAD(0x010c, PIN_INPUT, 1) /* (V11) PRG1_PRU1_GPO1.PR1_MII1_RXD1 */
+			AM64X_IOPAD(0x0108, PIN_INPUT, 1) /* (W11) PRG1_PRU1_GPO0.PR1_MII1_RXD0 */
+			AM64X_IOPAD(0x0128, PIN_INPUT, 1) /* (U12) PRG1_PRU1_GPO8.PR1_MII1_RXLINK */
+		>;
+	};
+};
+
+&cpsw3g {
+	pinctrl-0 = <&rgmii1_pins_default>;
+};
+
+&cpsw_port2 {
+	status = "disabled";
+};
+
+&mdio_mux_1 {
+	status = "disabled";
+};
+
+&icssg1_eth {
+	pinctrl-0 = <&icssg1_mii1_pins_default &icssg1_mii2_pins_default>;
+};
+
+&icssg1_emac0 {
+	phy-mode = "mii";
+};
+
+&icssg1_emac1 {
+	status = "okay";
+	phy-handle = <&icssg1_phy2>;
+	phy-mode = "mii";
+};
