board: amlogic: Add Odroid-N2 board support

Add a proper Odroid-N2 board support to handle the Ethernet MAC
address stored in the in-SoC eFuses.

Signed-off-by: Pascal Vizeli <pvizeli@syshack.ch>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Tested-by: Anand Moon <linux.amoon@gmail.com>

board/amlogic/odroid-n2/MAINTAINERS

@@ -0,0 +1,7 @@
+ODROID-N2
+M:	Neil Armstrong <narmstrong@baylibre.com>
+S:	Maintained
+L:	u-boot-amlogic@groups.io
+F:	board/amlogic/odroid-n2/
+F:	configs/odroid-n2_defconfig
+F:	doc/board/amlogic/odroid-n2.rst

board/amlogic/odroid-n2/Makefile

@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: GPL-2.0+
+#
+# (C) Copyright 2020 BayLibre, SAS
+# Author: Neil Armstrong <narmstrong@baylibre.com>
+
+obj-y	:= odroid-n2.o

board/amlogic/odroid-n2/odroid-n2.c

@@ -0,0 +1,49 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2020 BayLibre, SAS
+ * Author: Neil Armstrong <narmstrong@baylibre.com>
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <env.h>
+#include <init.h>
+#include <net.h>
+#include <asm/io.h>
+#include <asm/arch/sm.h>
+#include <asm/arch/eth.h>
+
+#define EFUSE_MAC_OFFSET	20
+#define EFUSE_MAC_SIZE		12
+#define MAC_ADDR_LEN		6
+
+int misc_init_r(void)
+{
+	u8 mac_addr[MAC_ADDR_LEN];
+	char efuse_mac_addr[EFUSE_MAC_SIZE], tmp[3];
+	ssize_t len;
+
+	meson_eth_init(PHY_INTERFACE_MODE_RGMII, 0);
+
+	if (!eth_env_get_enetaddr("ethaddr", mac_addr)) {
+		len = meson_sm_read_efuse(EFUSE_MAC_OFFSET,
+					  efuse_mac_addr, EFUSE_MAC_SIZE);
+		if (len != EFUSE_MAC_SIZE)
+			return 0;
+
+		/* MAC is stored in ASCII format, 1bytes = 2characters */
+		for (int i = 0; i < 6; i++) {
+			tmp[0] = efuse_mac_addr[i * 2];
+			tmp[1] = efuse_mac_addr[i * 2 + 1];
+			tmp[2] = '\0';
+			mac_addr[i] = simple_strtoul(tmp, NULL, 16);
+		}
+
+		if (is_valid_ethaddr(mac_addr))
+			eth_env_set_enetaddr("ethaddr", mac_addr);
+		else
+			meson_generate_serial_ethaddr();
+	}
+
+	return 0;
+}

board/amlogic/w400/MAINTAINERS

@@ -5,8 +5,6 @@ L:	u-boot-amlogic@groups.io
 F:	board/amlogic/w400/
 F:	configs/khadas-vim3_defconfig
 F:	configs/khadas-vim3l_defconfig
-F:	configs/odroid-n2_defconfig
 F:	doc/board/amlogic/w400.rst
 F:	doc/board/amlogic/khadas-vim3.rst
 F:	doc/board/amlogic/khadas-vim3l.rst
-F:	doc/board/amlogic/odroid-n2.rst

configs/odroid-n2_defconfig

@@ -1,5 +1,5 @@
 CONFIG_ARM=y
-CONFIG_SYS_BOARD="w400"
+CONFIG_SYS_BOARD="odroid-n2"
 CONFIG_ARCH_MESON=y
 CONFIG_SYS_TEXT_BASE=0x01000000
 CONFIG_ENV_SIZE=0x2000