add ENET ethernet support on i.MX 91 FRDM board

boards/nxp/frdm_imx91/frdm_imx91-pinctrl.dtsi

@@ -26,4 +26,40 @@
 			drive-strength = "x5";
 		};
 	};
+
+	pinmux_mdio: pinmux_mdio {
+		group0 {
+			pinmux = <&iomuxc1_enet2_mdc_enet_mdc_enet2_mdc>,
+				 <&iomuxc1_enet2_mdio_enet_mdio_enet2_mdio>;
+			bias-pull-down;
+			slew-rate = "slightly_fast";
+			drive-strength = "x6";
+		};
+	};
+
+	pinmux_enet: pinmux_enet {
+		group0 {
+			pinmux = <&iomuxc1_enet2_rd0_enet_rgmii_rd_enet2_rgmii_rd0>,
+				 <&iomuxc1_enet2_rd1_enet_rgmii_rd_enet2_rgmii_rd1>,
+				 <&iomuxc1_enet2_rd2_enet_rgmii_rd_enet2_rgmii_rd2>,
+				 <&iomuxc1_enet2_rd3_enet_rgmii_rd_enet2_rgmii_rd3>,
+				 <&iomuxc1_enet2_rx_ctl_enet_rgmii_rx_ctl_enet2_rgmii_rx_ctl>,
+				 <&iomuxc1_enet2_td0_enet_rgmii_td_enet2_rgmii_td0>,
+				 <&iomuxc1_enet2_td1_enet_rgmii_td_enet2_rgmii_td1>,
+				 <&iomuxc1_enet2_td2_enet_rgmii_td_enet2_rgmii_td2>,
+				 <&iomuxc1_enet2_td3_enet_rgmii_td_enet2_rgmii_td3>,
+				 <&iomuxc1_enet2_tx_ctl_enet_rgmii_tx_ctl_enet2_rgmii_tx_ctl>;
+			bias-pull-down;
+			slew-rate = "slightly_fast";
+			drive-strength = "x6";
+		};
+
+		group1 {
+			pinmux = <&iomuxc1_enet2_rxc_enet_rgmii_rxc_enet2_rgmii_rxc>,
+				 <&iomuxc1_enet2_txc_enet_rgmii_txc_enet2_rgmii_txc>;
+			bias-pull-down;
+			slew-rate = "fast";
+			drive-strength = "x6";
+		};
+	};
 };

boards/nxp/frdm_imx91/frdm_imx91_mimx9131.dts

@@ -35,3 +35,30 @@
 &tpm2 {
 	status = "okay";
 };
+
+&enet {
+	status = "okay";
+};
+
+&enet_mac {
+	pinctrl-0 = <&pinmux_enet>;
+	pinctrl-names = "default";
+	phy-handle = <&phy>;
+	zephyr,random-mac-address;
+	phy-connection-type = "rgmii";
+	status = "okay";
+};
+
+&enet_mdio {
+	pinctrl-0 = <&pinmux_mdio>;
+	pinctrl-names = "default";
+	status = "okay";
+
+	phy: phy@2 {
+		compatible = "motorcomm,yt8521";
+		reg = <2>;
+		status = "okay";
+		motorcomm,rx-delay-sel = <13>;
+		motorcomm,tx-delay-sel = <13>;
+	};
+};

boards/nxp/frdm_imx91/frdm_imx91_mimx9131.yaml

@@ -14,5 +14,6 @@ toolchain:
 ram: 1024
 supported:
   - counter
+  - net
   - uart
 vendor: nxp

boards/nxp/frdm_imx93/frdm_imx93_mimx9352_a55.dts

@@ -82,6 +82,33 @@
 	};
 };
 
+&enet {
+	status = "okay";
+};
+
+&enet_mac {
+	pinctrl-0 = <&pinmux_enet>;
+	pinctrl-names = "default";
+	phy-handle = <&phy>;
+	zephyr,random-mac-address;
+	phy-connection-type = "rgmii";
+	status = "okay";
+};
+
+&enet_mdio {
+	pinctrl-0 = <&pinmux_mdio>;
+	pinctrl-names = "default";
+	status = "okay";
+
+	phy: phy@2 {
+		compatible = "motorcomm,yt8521";
+		reg = <2>;
+		status = "okay";
+		motorcomm,rx-delay-sel = <13>;
+		motorcomm,tx-delay-sel = <13>;
+	};
+};
+
 &lpuart2 {
 	current-speed = <115200>;
 	pinctrl-0 = <&uart2_default>;

drivers/clock_control/clock_control_mcux_ccm_rev2.c

@@ -25,7 +25,7 @@ static int mcux_ccm_on(const struct device *dev,
 	switch (peripheral) {
 #ifdef CONFIG_ETH_NXP_ENET
 
-#ifdef CONFIG_SOC_MIMX9352
+#if defined(CONFIG_SOC_MIMX9352) || defined(CONFIG_SOC_MIMX9131)
 #define ENET1G_CLOCK	kCLOCK_Enet1
 #else
 #define ENET_CLOCK	kCLOCK_Enet
@@ -174,7 +174,7 @@ static int mcux_ccm_get_subsys_rate(const struct device *dev,
 #ifdef CONFIG_ETH_NXP_ENET
 	case IMX_CCM_ENET_CLK:
 	case IMX_CCM_ENET1G_CLK:
-#ifdef CONFIG_SOC_MIMX9352
+#if defined(CONFIG_SOC_MIMX9352) || defined(CONFIG_SOC_MIMX9131)
 		clock_root = kCLOCK_Root_WakeupAxi;
 #else
 		clock_root = kCLOCK_Root_Bus;

drivers/ethernet/phy/CMakeLists.txt

@@ -8,6 +8,7 @@ zephyr_library_sources_ifdef(CONFIG_PHY_DM8806	phy_dm8806.c)
 zephyr_library_sources_ifdef(CONFIG_PHY_MICROCHIP_KSZ8081	phy_microchip_ksz8081.c)
 zephyr_library_sources_ifdef(CONFIG_PHY_MICROCHIP_T1S phy_microchip_t1s.c)
 zephyr_library_sources_ifdef(CONFIG_PHY_MICROCHIP_VSC8541 phy_microchip_vsc8541.c)
+zephyr_library_sources_ifdef(CONFIG_PHY_MOTORCOMM_YT8521 phy_motorcomm_yt8521.c)
 zephyr_library_sources_ifdef(CONFIG_PHY_OA_TC14_PLCA_LIB phy_oa_tc14_plca.c)
 zephyr_library_sources_ifdef(CONFIG_PHY_QUALCOMM_AR8031 phy_qualcomm_ar8031.c)
 zephyr_library_sources_ifdef(CONFIG_PHY_REALTEK_RTL8211F phy_realtek_rtl8211f.c)

drivers/ethernet/phy/Kconfig

@@ -129,4 +129,12 @@ config PHY_VERIFY_DEVICE_IDENTIFICATION
 	  Verify the organizationally unique identifier that is reported
 	  by the phy chip.
 
+config PHY_MOTORCOMM_YT8521
+	bool "Motorcomm YT8521 Ethernet PHY Driver"
+	default y
+	depends on DT_HAS_MOTORCOMM_YT8521_ENABLED
+	select MDIO
+	help
+	  Enable Motorcomm YT8521 Ethernet PHY Driver
+
 endif # "Ethernet PHY Drivers"