mips: mtmips: add two reference boards for mt7620

The mt7620_rfb board supports integrated 10/100M PHYs plus two external
giga PHYs. It also has 8MB SPI-NOR, mini PCI-e x1 slot, SDHC and USB.

The mt7620_mt7530_rfb boards supports an external MT7530 giga switch and a
16MB SPI-NOR flash.

Reviewed-by: Stefan Roese <sr@denx.de>
diff --git a/board/mediatek/mt7620/Kconfig b/board/mediatek/mt7620/Kconfig
new file mode 100644
index 0000000..b9137ad
--- /dev/null
+++ b/board/mediatek/mt7620/Kconfig
@@ -0,0 +1,12 @@
+if BOARD_MT7620_RFB || BOARD_MT7620_MT7530_RFB
+
+config SYS_BOARD
+	default "mt7620"
+
+config SYS_VENDOR
+	default "mediatek"
+
+config SYS_CONFIG_NAME
+	default "mt7620"
+
+endif
diff --git a/board/mediatek/mt7620/MAINTAINERS b/board/mediatek/mt7620/MAINTAINERS
new file mode 100644
index 0000000..05db777
--- /dev/null
+++ b/board/mediatek/mt7620/MAINTAINERS
@@ -0,0 +1,9 @@
+MT7620_RFB BOARD
+M:	Weijie Gao <weijie.gao@mediatek.com>
+S:	Maintained
+F:	board/mediatek/mt7620
+F:	include/configs/mt7620.h
+F:	configs/mt7620_rfb_defconfig
+F:	configs/mt7620_mt7530_rfb_defconfig
+F:	arch/mips/dts/mediatek,mt7620-rfb.dts
+F:	arch/mips/dts/mediatek,mt7620-mt7530-rfb.dts
diff --git a/board/mediatek/mt7620/Makefile b/board/mediatek/mt7620/Makefile
new file mode 100644
index 0000000..db129c5
--- /dev/null
+++ b/board/mediatek/mt7620/Makefile
@@ -0,0 +1,3 @@
+# SPDX-License-Identifier: GPL-2.0
+
+obj-y += board.o
diff --git a/board/mediatek/mt7620/board.c b/board/mediatek/mt7620/board.c
new file mode 100644
index 0000000..119b8fc
--- /dev/null
+++ b/board/mediatek/mt7620/board.c
@@ -0,0 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2020 MediaTek Inc. All Rights Reserved.
+ *
+ * Author: Weijie Gao <weijie.gao@mediatek.com>
+ */