boards: mr_canhubk3: enable EMAC

This board has a single instance of EMAC connected to a NXP TJA1103
Ethernet PHY. Currently, there is no driver for this PHY and its
pin strapping configuration allows to use it without software
configuration, so EMAC is configured as fixed link.

Signed-off-by: Manuel Argüelles <manuel.arguelles@nxp.com>

boards/arm/mr_canhubk3/Kconfig.defconfig

@@ -20,4 +20,11 @@ config GPIO
 
 endif # CAN
 
+if NETWORKING
+
+config NET_L2_ETHERNET
+	default y
+
+endif # NETWORKING
+
 endif # BOARD_MR_CANHUBK3

boards/arm/mr_canhubk3/doc/index.rst

@@ -55,6 +55,7 @@ LPI2C         on-chip     i2c
 ADC SAR       on-chip     adc
 LPSPI         on-chip     spi
 WDT           FS26 SBC    watchdog
+EMAC          on-chip     ethernet
 ============  ==========  ================================
 
 The default configuration can be found in the Kconfig file
@@ -228,6 +229,18 @@ The on-board MX25L6433F 64M-bit multi-I/O Serial NOR Flash memory is connected
 to the QSPI controller port A1. This board configuration selects it as the
 default flash controller.
 
+Ethernet
+========
+
+This board has a single instance of Ethernet Media Access Controller (EMAC)
+interfacing with a `NXP TJA1103`_ 100Base-T1 Ethernet PHY. Currently, there is
+no driver for this PHY and this board default pin strapping configuration for
+the PHY (RMII, master, autonomous mode enabled, polarity correction enabled)
+allows to use it without software configuration.
+
+The 100Base-T1 signals are available in connector ``P9`` and can be converted to
+100Base-T using a Ethernet media converter such as `RDDRONE-T1ADAPT`_.
+
 Programming and Debugging
 *************************
 
@@ -295,6 +308,12 @@ References
 .. _NXP FS26 Safety System Basis Chip:
    https://www.nxp.com/products/power-management/pmics-and-sbcs/safety-sbcs/safety-system-basis-chip-with-low-power-fit-for-asil-d:FS26
 
+.. _NXP TJA1103:
+   https://www.nxp.com/products/interfaces/ethernet-/automotive-ethernet-phys/asil-b-compliant-100base-t1-ethernet-phy:TJA1103
+
+.. _RDDRONE-T1ADAPT:
+   https://www.nxp.com/products/interfaces/ethernet-/automotive-ethernet-phys/ethernet-media-converter-for-drones-rovers-mobile-robotics-and-automotive:RDDRONE-T1ADAPT
+
 .. _Lauterbach TRACE32:
    https://www.lauterbach.com
 

boards/arm/mr_canhubk3/mr_canhubk3-pinctrl.dtsi

@@ -253,4 +253,21 @@
 			input-enable;
 		};
 	};
+
+	emac0_default: emac0_default {
+		group1 {
+			pinmux = <PTC0_EMAC_MII_RMII_RXD0>,
+				<PTC1_EMAC_MII_RMII_RXD1>,
+				<PTC14_EMAC_MII_RMII_RX_ER>,
+				<PTC15_EMAC_MII_RMII_RX_DV>,
+				<PTD6_EMAC_MII_RMII_TX_CLK>;
+			input-enable;
+		};
+		group2 {
+			pinmux = <PTB5_EMAC_MII_RMII_TXD0>,
+				<PTB4_EMAC_MII_RMII_TXD1>,
+				<PTE9_EMAC_MII_RMII_TX_EN>;
+			output-enable;
+		};
+	};
 };

boards/arm/mr_canhubk3/mr_canhubk3.dts

@@ -362,3 +362,16 @@
 	pinctrl-names = "default";
 	data-pin-config = "sdo-in,sdi-out";
 };
+
+&emac0 {
+	pinctrl-0 = <&emac0_default>;
+	pinctrl-names = "default";
+	phy-connection-type = "rmii";
+	local-mac-address = [02 04 9f aa bb cc];
+	status = "okay";
+
+	fixed-link {
+		speed = <100>;
+		full-duplex;
+	};
+};

boards/arm/mr_canhubk3/mr_canhubk3.yaml

@@ -17,3 +17,4 @@ supported:
   - adc
   - spi
   - watchdog
+  - netif:eth

samples/net/zperf/boards/mr_canhubk3.conf

@@ -0,0 +1,9 @@
+# Copyright 2023 NXP
+# SPDX-License-Identifier: Apache-2.0
+
+CONFIG_ASSERT=n
+CONFIG_LOG=n
+CONFIG_NET_LOG=n
+CONFIG_NET_IP_ADDR_CHECK=n
+CONFIG_SPEED_OPTIMIZATIONS=y
+CONFIG_NET_ZPERF_MAX_PACKET_SIZE=1470