drivers: ethernet: support for Nuvoton numaker series

Add Nuvoton numaker series EMAC controller feature.

Signed-off-by: cyliang tw <cyliang@nuvoton.com>

Author: cyliangtw

boards/arm/numaker_pfm_m467/numaker_pfm_m467-pinctrl.dtsi

@@ -32,4 +32,21 @@
 				 <PJ11MFP_CAN0_RXD>;
 		};
 	};
+
+	/* EMAC multi-function pins for MDIO, TX, REFCLK, RX pins */
+	emac_default: emac_default {
+		group0 {
+			pinmux = <PE8MFP_EMAC0_RMII_MDC>,
+				 <PE9MFP_EMAC0_RMII_MDIO>,
+				 <PE10MFP_EMAC0_RMII_TXD0>,
+				 <PE11MFP_EMAC0_RMII_TXD1>,
+				 <PE12MFP_EMAC0_RMII_TXEN>,
+				 <PC8MFP_EMAC0_RMII_REFCLK>,
+				 <PC7MFP_EMAC0_RMII_RXD0>,
+				 <PC6MFP_EMAC0_RMII_RXD1>,
+				 <PA7MFP_EMAC0_RMII_CRSDV>,
+				 <PA6MFP_EMAC0_RMII_RXERR>,
+				 <PB6MFP_EMAC0_PPS>;
+		};
+	};
 };

boards/arm/numaker_pfm_m467/numaker_pfm_m467.dts

@@ -117,3 +117,9 @@
 	pinctrl-names = "default";
 	status = "okay";
 };
+
+&emac {
+	pinctrl-0 = <&emac_default>;
+	pinctrl-names = "default";
+	status = "okay";
+};

drivers/ethernet/CMakeLists.txt

@@ -42,6 +42,7 @@ if(CONFIG_ETH_NXP_S32_NETC)
 endif()
 
 zephyr_library_sources_ifdef(CONFIG_ETH_NXP_S32_GMAC	eth_nxp_s32_gmac.c)
+zephyr_library_sources_ifdef(CONFIG_ETH_NUMAKER		eth_numaker.c)
 
 if(CONFIG_ETH_NATIVE_POSIX)
   set(native_posix_source_files eth_native_posix.c eth_native_posix_adapt.c)

drivers/ethernet/Kconfig

@@ -61,6 +61,7 @@ source "drivers/ethernet/Kconfig.nxp_s32_gmac"
 source "drivers/ethernet/Kconfig.smsc91x"
 source "drivers/ethernet/Kconfig.ivshmem"
 source "drivers/ethernet/Kconfig.adin2111"
+source "drivers/ethernet/Kconfig.numaker"
 
 source "drivers/ethernet/phy/Kconfig"
 

drivers/ethernet/Kconfig.numaker

@@ -0,0 +1,14 @@
+# NUMAKER Ethernet Driver configuration options
+
+# Copyright (c) 2023 Nuvoton Technology Corporation.
+# SPDX-License-Identifier: Apache-2.0
+
+config ETH_NUMAKER
+	bool "Nuvoton NUMAKER MCU Ethernet driver"
+	default y
+	select HAS_NUMAKER_ETH
+	depends on DT_HAS_NUVOTON_NUMAKER_ETHERNET_ENABLED
+	help
+	  This option enables the Ethernet driver for Nuvoton NuMaker family of
+	  processors.
+	  Say y if you wish to enable NuMaker ETH.