ramips: mt7621: add support for JDCloud RE-SP-01B

JDCloud RE-SP-01B is a dual-band WiFi 5 router based on the MT7621AT.

Specifications:
- SoC: MediaTek MT7621AT
- RAM: 512MB DDR3
- Flash: 32MB SPI NOR
- WiFi: MediaTek MT7603EN (2.4GHz), MediaTek MT7615N (5GHz)
- Ethernet: 1x WAN, 2x LAN (Gigabit Ethernet)
- LEDs: red, blue, green (GPIO controlled)
- Button: Reset (GPIO controlled)
- eMMC: Single onboard (32GB/64GB/128GB)
- USB: 1x USB 2.0 port

MAC Address Structure:
The MAC addresses share the structure DC:D8:7C:XX:XX:XX, where:
- WAN, LAN, and 2.4GHz WiFi: same as the label MAC address.
- 5GHz WiFi: label MAC address + 0x800000.

The manufacturer writes the label MAC address at different
offsets depending on the storage version of the device:

e.g.
128GB version:  &config + 0x442a
64GB version:   &config + 0x4429

So `get_mac_ascii()` is used here to search for the
base label MAC address of the device.

Ref:
https://github.com/openwrt/openwrt/pull/17409#discussion_r1899674262
https://github.com/immortalwrt/immortalwrt/commit/c0c480d

Flash Instruction:
A 3rd party bootloader is required to boot the image. You can
use a SOP16 test clip to burn the image/bootloader to the flash.

The official bootloader does provide a web recovery interface
which only accepts an official image. To access it, you will
need to hold the reset button and power on the device, set your
IP address to 192.168.68.2 and visit http://192.168.68.1.

Co-authored-by: Chukun Pan <amadeus@jmu.edu.cn>
Signed-off-by: Yijie Jin <jinyijie@outlook.com>
Link: https://github.com/openwrt/openwrt/pull/17409
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

4 files changed, 200 insertions, 0 deletions

diff --git a/target/linux/ramips/dts/mt7621_jdcloud_re-sp-01b.dts b/target/linux/ramips/dts/mt7621_jdcloud_re-sp-01b.dts
new file mode 100644
index 0000000000..3a9dd7574d
--- /dev/null
+++ b/target/linux/ramips/dts/mt7621_jdcloud_re-sp-01b.dts
@@ -0,0 +1,179 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+
+#include "mt7621.dtsi"
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+#include <dt-bindings/leds/common.h>
+
+/ {
+	compatible = "jdcloud,re-sp-01b", "mediatek,mt7621-soc";
+	model = "JDCloud RE-SP-01B";
+
+	aliases {
+		led-boot = &led_status_red;
+		led-failsafe = &led_status_red;
+		led-running = &led_status_green;
+		led-upgrade = &led_status_blue;
+	};
+
+	chosen {
+		bootargs = "console=ttyS0,115200";
+	};
+
+	keys {
+		compatible = "gpio-keys";
+
+		reset {
+			label = "reset";
+			gpios = <&gpio 18 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_RESTART>;
+		};
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		led_status_red: led-red {
+			function = LED_FUNCTION_STATUS;
+			color = <LED_COLOR_ID_RED>;
+			gpios = <&gpio 6 GPIO_ACTIVE_LOW>;
+		};
+
+		led_status_green: led-green {
+			function = LED_FUNCTION_STATUS;
+			color = <LED_COLOR_ID_GREEN>;
+			gpios = <&gpio 8 GPIO_ACTIVE_LOW>;
+		};
+
+		led_status_blue: led-blue {
+			function = LED_FUNCTION_STATUS;
+			color = <LED_COLOR_ID_BLUE>;
+			gpios = <&gpio 12 GPIO_ACTIVE_LOW>;
+		};
+	};
+};
+
+&sdhci {
+	status = "okay";
+};
+
+&spi0 {
+	status = "okay";
+
+	flash@0 {
+		compatible = "jedec,spi-nor";
+		reg = <0>;
+		spi-max-frequency = <50000000>;
+
+		partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			partition@0 {
+				label = "u-boot";
+				reg = <0x0 0x30000>;
+				read-only;
+			};
+
+			partition@30000 {
+				label = "config";
+				reg = <0x30000 0x10000>;
+				read-only;
+			};
+
+			partition@40000 {
+				label = "factory";
+				reg = <0x40000 0x10000>;
+				read-only;
+
+				nvmem-layout {
+					compatible = "fixed-layout";
+					#address-cells = <1>;
+					#size-cells = <1>;
+
+					eeprom_factory_0: eeprom@0 {
+						reg = <0x0 0x400>;
+					};
+
+					eeprom_factory_8000: eeprom@8000 {
+						reg = <0x8000 0x4da8>;
+					};
+				};
+			};
+
+			partition@50000 {
+				compatible = "denx,uimage";
+				label = "firmware";
+				reg = <0x50000 0x1ab0000>;
+			};
+
+			partition@1b00000 {
+				label = "mini";
+				reg = <0x1b00000 0x400000>;
+				read-only;
+			};
+
+			partition@1f00000 {
+				label = "oem";
+				reg = <0x1f00000 0x100000>;
+				read-only;
+			};
+		};
+	};
+};
+
+&gmac1 {
+	status = "okay";
+	label = "wan";
+	phy-handle = <&ethphy0>;
+};
+
+&ethphy0 {
+	/delete-property/ interrupts;
+};
+
+&switch0 {
+	ports {
+		port@1 {
+			status = "okay";
+			label = "lan1";
+		};
+
+		port@2 {
+			status = "okay";
+			label = "lan2";
+		};
+	};
+};
+
+&pcie {
+	status = "okay";
+};
+
+&pcie0 {
+	wifi@0,0 {
+		compatible = "mediatek,mt76";
+		reg = <0x0000 0 0 0 0>;
+		nvmem-cells = <&eeprom_factory_0>;
+		nvmem-cell-names = "eeprom";
+	};
+};
+
+&pcie1 {
+	wifi@0,0 {
+		compatible = "mediatek,mt76";
+		reg = <0x0000 0 0 0 0>;
+		nvmem-cells = <&eeprom_factory_8000>;
+		nvmem-cell-names = "eeprom";
+		ieee80211-freq-limit = <5000000 6000000>;
+	};
+};
+
+&state_default {
+	gpio {
+		groups = "uart2", "uart3", "wdt";
+		function = "gpio";
+	};
+};
diff --git a/target/linux/ramips/image/mt7621.mk b/target/linux/ramips/image/mt7621.mk
index 9398584cdb..941c4d3e7e 100644
--- a/target/linux/ramips/image/mt7621.mk
+++ b/target/linux/ramips/image/mt7621.mk
@@ -1857,6 +1857,16 @@ define Device/jdcloud_re-cp-02
 endef
 TARGET_DEVICES += jdcloud_re-cp-02
 
+define Device/jdcloud_re-sp-01b
+  $(Device/dsa-migration)
+  IMAGE_SIZE := 27328k
+  DEVICE_VENDOR := JDCloud
+  DEVICE_MODEL := RE-SP-01B
+  DEVICE_PACKAGES := kmod-mt7603 kmod-mt7615-firmware \
+	kmod-mmc-mtk kmod-usb3
+endef
+TARGET_DEVICES += jdcloud_re-sp-01b
+
 define Device/keenetic_kn-1910
   $(Device/nand)
   $(Device/uimage-lzma-loader)
diff --git a/target/linux/ramips/mt7621/base-files/etc/board.d/02_network b/target/linux/ramips/mt7621/base-files/etc/board.d/02_network
index 31c3f143a0..1e194fef5f 100644
--- a/target/linux/ramips/mt7621/base-files/etc/board.d/02_network
+++ b/target/linux/ramips/mt7621/base-files/etc/board.d/02_network
@@ -97,6 +97,7 @@ ramips_setup_interfaces()
 	iodata,wn-deax1800gr|\
 	iptime,a3002mesh|\
 	jcg,q20|\
+	jdcloud,re-sp-01b|\
 	lenovo,newifi-d1|\
 	mikrotik,routerboard-m33g|\
 	mts,wg430223|\
@@ -280,6 +281,11 @@ ramips_setup_macs()
 		lan_mac=$(mtd_get_mac_ascii u-boot-env ethaddr)
 		wan_mac=$(macaddr_add "$lan_mac" 1)
 		;;
+	jdcloud,re-sp-01b)
+		lan_mac=$(mtd_get_mac_ascii config mac)
+		wan_mac=$lan_mac
+		label_mac=$lan_mac
+		;;
 	linksys,e5600|\
 	linksys,ea6350-v4|\
 	linksys,ea7300-v1|\
diff --git a/target/linux/ramips/mt7621/base-files/etc/hotplug.d/ieee80211/10_fix_wifi_mac b/target/linux/ramips/mt7621/base-files/etc/hotplug.d/ieee80211/10_fix_wifi_mac
index d2da8a227b..0c9c98399a 100644
--- a/target/linux/ramips/mt7621/base-files/etc/hotplug.d/ieee80211/10_fix_wifi_mac
+++ b/target/linux/ramips/mt7621/base-files/etc/hotplug.d/ieee80211/10_fix_wifi_mac
@@ -130,6 +130,11 @@ case "$board" in
 		[ "$PHYNBR" = "1" ] && \
 			macaddr_setbit_la "$(mtd_get_mac_binary Factory 0x4)" > /sys${DEVPATH}/macaddress
 		;;
+	jdcloud,re-sp-01b)
+		hw_mac_addr=$(mtd_get_mac_ascii config mac)
+		[ "$PHYNBR" = "0" ] && echo $hw_mac_addr > /sys${DEVPATH}/macaddress
+		[ "$PHYNBR" = "1" ] && macaddr_add $hw_mac_addr 0x800000 > /sys${DEVPATH}/macaddress
+		;;
 	keenetic,kn-1910)
 		lan_mac_addr="$(mtd_get_mac_binary RF-EEPROM 0x4)"
 		[ "$PHYNBR" = "1" ] && \