ramips: add xiaomi_miwifi-r3 support

Specification:
 - CPU: 580 MHz
 - Flash size: 128 MiB NAND
 - RAM size: 128 MiB DDR2
 - Wireless No1: SoC-integrated: MT7620A 2x2 MIMO 802.11b/g/n (2.4 GHz)
 - Wireless No2: On-board chip: MT7612E 2x2 MIMO 802.11a/n/ac (5 GHz)
 - Switch: MT7620 built-in 10/100 switch w/ vlan support
 - USB: 2.0 x1

Fixes: #7841

Signed-off-by: Chen Minqiang <ptpt52@gmail.com>

target/linux/ramips/dts/mt7620a_xiaomi_miwifi-r3.dts

@@ -0,0 +1,175 @@
+/dts-v1/;
+
+#include "mt7620a.dtsi"
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+
+/ {
+	compatible = "xiaomi,miwifi-r3", "ralink,mt7620a-soc";
+	model = "Xiaomi Mi Router R3";
+
+	aliases {
+		led-status = &led_status_blue;
+	};
+
+	chosen {
+		bootargs = "console=ttyS0,115200";
+	};
+
+	keys {
+		compatible = "gpio-keys";
+
+		reset {
+			label = "reset";
+			gpios = <&gpio1 6 GPIO_ACTIVE_HIGH>;
+			linux,code = <KEY_RESTART>;
+		};
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		led_status_blue: blue {
+			label = "blue:status";
+			gpios = <&gpio1 0 GPIO_ACTIVE_LOW>;
+			default-state = "on";
+		};
+
+		yellow {
+			label = "yellow:status";
+			gpios = <&gpio1 2 GPIO_ACTIVE_LOW>;
+		};
+
+		red {
+			label = "red:status";
+			gpios = <&gpio1 5 GPIO_ACTIVE_LOW>;
+		};
+	};
+
+	nand {
+		status = "okay";
+		#address-cells = <1>;
+		#size-cells = <1>;
+		compatible = "mtk,mt7620-nand";
+
+		partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			partition@0 {
+				label = "Bootloader";
+				reg = <0x0 0x40000>;
+				read-only;
+			};
+
+			partition@40000 {
+				label = "Config";
+				reg = <0x40000 0x40000>;
+			};
+
+			partition@80000 {
+				label = "Bdata";
+				reg = <0x80000 0x40000>;
+				read-only;
+			};
+
+			factory: partition@0xc0000 {
+				label = "factory";
+				reg = <0xc0000 0x40000>;
+				read-only;
+			};
+
+			partition@100000 {
+				label = "crash";
+				reg = <0x100000 0x40000>;
+				read-only;
+			};
+
+			partition@140000 {
+				label = "crash_syslog";
+				reg = <0x140000 0x40000>;
+				read-only;
+			};
+
+			partition@180000 {
+				label = "reserved0";
+				reg = <0x180000 0x80000>;
+				read-only;
+			};
+
+			partition@200000 {
+				label = "kernel_stock";
+				reg = <0x200000 0x400000>;
+			};
+
+			partition@600000 {
+				label = "kernel";
+				reg = <0x600000 0x400000>;
+			};
+
+			/* ubi partition is the result of squashing
+			 * next consequent stock partitions:
+			 * - rootfs0 (rootfs partition for stock kernel0),
+			 * - rootfs1 (rootfs partition for stock failsafe kernel1),
+			 * - overlay (used as ubi overlay in stock fw)
+			 * resulting 117,5MiB space for packages.
+			 */
+			partition@a00000 {
+				label = "ubi";
+				reg = <0xa00000 0x7600000>;
+			};
+		};
+	};
+};
+
+&gpio1 {
+	status = "okay";
+};
+
+&ehci {
+	status = "okay";
+};
+
+&ohci {
+	status = "okay";
+};
+
+&ethernet {
+	pinctrl-names = "default";
+	pinctrl-0 = <&ephy_pins>;
+	mtd-mac-address = <&factory 0x28>;
+	mediatek,portmap = "llllw";
+};
+
+&wmac {
+	ralink,mtd-eeprom = <&factory 0>;
+};
+
+&pcie {
+	status = "okay";
+};
+
+&pcie0 {
+	wifi@0,0 {
+		compatible = "pci14c3,7662";
+		reg = <0x0000 0 0 0 0>;
+		mediatek,mtd-eeprom = <&factory 0x8000>;
+		ieee80211-freq-limit = <5000000 6000000>;
+	};
+};
+
+&pinctrl {
+	state_default: pinctrl0 {
+		gpio {
+			groups = "rgmii1";
+			function = "gpio";
+		};
+
+		pa {
+			groups = "pa";
+			function = "pa";
+		};
+	};
+};

target/linux/ramips/image/mt7620.mk

@@ -1123,6 +1123,23 @@ define Device/xiaomi_miwifi-mini
 endef
 TARGET_DEVICES += xiaomi_miwifi-mini
 
+define Device/xiaomi_miwifi-r3
+  SOC := mt7620a
+  BLOCKSIZE := 128k
+  PAGESIZE := 2048
+  KERNEL_SIZE := 4096k
+  IMAGE_SIZE := 32768k
+  UBINIZE_OPTS := -E 5
+  IMAGES += kernel1.bin rootfs0.bin
+  IMAGE/kernel1.bin := append-kernel | check-size $$$$(KERNEL_SIZE)
+  IMAGE/rootfs0.bin := append-ubi | check-size $$$$(IMAGE_SIZE)
+  IMAGE/sysupgrade.bin := sysupgrade-tar | append-metadata
+  DEVICE_VENDOR := Xiaomi
+  DEVICE_MODEL := Mi Router R3
+  DEVICE_PACKAGES := kmod-mt76x2 kmod-usb2 kmod-usb-ohci uboot-envtools
+endef
+TARGET_DEVICES += xiaomi_miwifi-r3
+
 define Device/youku_yk-l1
   SOC := mt7620a
   IMAGE_SIZE := 32448k

target/linux/ramips/mt7620/base-files/etc/board.d/02_network

@@ -230,6 +230,10 @@ ramips_setup_interfaces()
 		ucidef_add_switch "switch0" \
 			"0:lan" "1:lan" "4:wan" "6@eth0"
 		;;
+	xiaomi,miwifi-r3)
+		ucidef_add_switch "switch0" \
+			"1:lan" "4:lan" "0:wan" "6@eth0"
+		;;
 	zbtlink,zbt-we1026-5g-16m)
 		ucidef_add_switch "switch0" \
 			"0:lan" "6t@eth0"
@@ -367,6 +371,10 @@ ramips_setup_macs()
 	tplink,archer-mr200)
 		wan_mac=$(macaddr_add "$(mtd_get_mac_binary rom 0xf100)" 1)
 		;;
+	xiaomi,miwifi-r3)
+		wan_mac=$(mtd_get_mac_binary factory 0x28)
+		lan_mac=$(macaddr_setbit_la "$wan_mac")
+		;;
 	zbtlink,zbt-we1026-5g-16m)
 		label_mac=$(mtd_get_mac_binary factory 0x4)
 		;;

target/linux/ramips/mt7620/base-files/lib/upgrade/platform.sh

@@ -30,6 +30,13 @@ platform_do_upgrade() {
 		}
 		default_do_upgrade "$1"
 		;;
+	xiaomi,miwifi-r3)
+		# this make it compatible with breed
+		dd if=/dev/mtd0 bs=64 count=1 2>/dev/null | grep -qi breed && CI_KERNPART_EXT="kernel_stock"
+		dd if=/dev/mtd7 bs=64 count=1 2>/dev/null | grep -o MIPS.*Linux | grep -qi X-WRT && CI_KERNPART_EXT="kernel_stock"
+		dd if=/dev/mtd7 bs=64 count=1 2>/dev/null | grep -o MIPS.*Linux | grep -qi NATCAP && CI_KERNPART_EXT="kernel0_rsvd"
+		nand_do_upgrade "$1"
+		;;
 	*)
 		default_do_upgrade "$1"
 		;;