ramips: add support for ASUS RT-AC57U

SoC:   MediaTek MT7621AT
RAM:   128M (Winbond W631GG6KB-15)
FLASH: 16MB (Spansion S25FL128SA)
WiFi:  MediaTek MT7603EN bgn 2SS
WiFi:  MediaTek MT7612EN nac 2SS
BTN:   Reset - WPS
LED:    - Power
        - LAN {1-4}
        - WAN
        - WiFi 2.4 GHz
        - WiFi 5 GHz
        - USB
UART:  UART is present next to the Power LED.
       TX - RX - GND - 3V3 / 57600-8N1
       3V3 is the nearest one to the Power LED.

Installation
------------
Via TFTP:
1. Set your computers IP-Address to 192.168.1.75.
2. Power up the Router with the Reset button pressed.
3. Release the Reset button after 5 seconds.
4. Upload OpenWRT sysupgrade image via TFTP:
 > tftp -4 -v -m binary 192.168.1.1 -c put <IMAGE>

Via SSH:
Note: User/password for SSH is identical with the one used in the
Web-interface.
1. Complete the initial setup wizard.
2. Activate SSH under "Administration" -> "System".
3. Transfer the OpenWrt sysupgrade image via scp:
 > scp owrt.bin admin@192.168.1.1:/tmp
4. Connect via SSH to the router.
 > ssh admin@192.168.1.1
5. Write the OpenWrt image to flash.
 > mtd-write -i /tmp/owrt.bin -d linux
6. Reboot the router
 > reboot

Signed-off-by: David Bauer <mail@david-bauer.net>

3 files changed, 163 insertions, 4 deletions

diff --git a/target/linux/ramips/base-files/etc/board.d/02_network b/target/linux/ramips/base-files/etc/board.d/02_network
index 688ce55570..c3b7cd4390 100755
--- a/target/linux/ramips/base-files/etc/board.d/02_network
+++ b/target/linux/ramips/base-files/etc/board.d/02_network
@@ -186,6 +186,7 @@ ramips_setup_interfaces()
 	argus,atp-52b|\
 	asiarf,awm002-evb-4m|\
 	asiarf,awm002-evb-8m|\
+	asus,rt-ac57u|\
 	asus,rt-n14u|\
 	bdcom,wap2100-sk|\
 	dlink,dir-645|\
@@ -521,6 +522,11 @@ ramips_setup_macs()
 		lan_mac=$(macaddr_setbit_la "$lan_mac")
 		wan_mac=$(macaddr_add "$lan_mac" 1)
 		;;
+	asus,rt-ac57u|\
+	planex,vr500)
+		lan_mac=$(mtd_get_mac_binary factory 57344)
+		wan_mac=$(mtd_get_mac_binary factory 57350)
+		;;
 	asus,rt-n56u)
 		lan_mac=$(cat /sys/class/net/eth0/address)
 		lan_mac=$(macaddr_setbit_la "$lan_mac")
@@ -641,10 +647,6 @@ ramips_setup_macs()
 		wan_mac=$(mtd_get_mac_binary factory 4)
 		lan_mac=$(mtd_get_mac_binary factory 46)
 		;;
-	planex,vr500)
-		lan_mac=$(mtd_get_mac_binary factory 57344)
-		wan_mac=$(mtd_get_mac_binary factory 57350)
-		;;
 	poray,m3|\
 	poray,m4-4m|\
 	poray,m4-8m|\
diff --git a/target/linux/ramips/dts/mt7621_asus_rt-ac57u.dts b/target/linux/ramips/dts/mt7621_asus_rt-ac57u.dts
new file mode 100644
index 0000000000..8060fd9eaa
--- /dev/null
+++ b/target/linux/ramips/dts/mt7621_asus_rt-ac57u.dts
@@ -0,0 +1,148 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+/dts-v1/;
+
+#include "mt7621.dtsi"
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+
+/ {
+	compatible = "asus,rt-ac57u", "mediatek,mt7621-soc";
+	model = "ASUS RT-AC57U";
+
+	aliases {
+		led-boot = &led_power;
+		led-failsafe = &led_power;
+		led-running = &led_power;
+		led-upgrade = &led_power;
+	};
+
+	chosen {
+		bootargs = "console=ttyS0,57600";
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		led_power: power {
+			label = "rt-ac57u:blue:power";
+			gpios = <&gpio1 16 GPIO_ACTIVE_LOW>;
+		};
+
+		usb {
+			label = "rt-ac57u:blue:usb";
+			gpios = <&gpio1 15 GPIO_ACTIVE_LOW>;
+			trigger-sources = <&ehci_port2>;
+			linux,default-trigger = "usbport";
+		};
+	};
+
+	keys {
+		compatible = "gpio-keys";
+
+		wps {
+			label = "wps";
+			gpios = <&gpio1 11 GPIO_ACTIVE_HIGH>;
+			linux,code = <KEY_WPS_BUTTON>;
+			debounce-interval = <60>;
+		};
+
+		reset {
+			label = "reset";
+			gpios = <&gpio1 9 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_RESTART>;
+			debounce-interval = <60>;
+		};
+	};
+
+	led-regulator {
+		compatible = "regulator-fixed";
+		regulator-name = "LED-Power";
+		gpio = <&gpio1 14 GPIO_ACTIVE_LOW>;
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		regulator-always-on;
+	};
+};
+
+&spi0 {
+	status = "okay";
+
+	flash@0 {
+		compatible = "jedec,spi-nor";
+		reg = <0>;
+		spi-max-frequency = <10000000>;
+
+		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;
+			};
+
+			factory: partition@40000 {
+				label = "factory";
+				reg = <0x40000 0x10000>;
+				read-only;
+			};
+
+			partition@50000 {
+				compatible = "denx,uimage";
+				label = "firmware";
+				reg = <0x50000 0xfb0000>;
+			};
+		};
+	};
+};
+
+&pcie {
+	status = "okay";
+};
+
+&pcie0 {
+	wifi@0,0 {
+		compatible = "mediatek,mt76";
+		reg = <0x0000 0 0 0 0>;
+		mediatek,mtd-eeprom = <&factory 0x8000>;
+
+		led {
+			led-sources = <2>;
+			led-active-low;
+		};
+	};
+};
+
+&pcie1 {
+	wifi@0,0 {
+		compatible = "mediatek,mt76";
+		reg = <0x0000 0 0 0 0>;
+		mediatek,mtd-eeprom = <&factory 0x0000>;
+
+		led {
+			led-active-low;
+		};
+	};
+};
+
+&ethernet {
+	mtd-mac-address = <&factory 0x4e000>;
+};
+
+&pinctrl {
+	state_default: pinctrl0 {
+		gpio {
+			ralink,group = "sdhci";
+			ralink,function = "gpio";
+		};
+	};
+};
diff --git a/target/linux/ramips/image/mt7621.mk b/target/linux/ramips/image/mt7621.mk
index 1cd9092b14..e2928c80ce 100644
--- a/target/linux/ramips/image/mt7621.mk
+++ b/target/linux/ramips/image/mt7621.mk
@@ -106,6 +106,15 @@ define Device/asiarf_ap7621-001
 endef
 TARGET_DEVICES += asiarf_ap7621-001
 
+define Device/asus_rt-ac57u
+  MTK_SOC := mt7621
+  DEVICE_VENDOR := ASUS
+  DEVICE_MODEL := RT-AC57U
+  IMAGE_SIZE := 16064k
+  DEVICE_PACKAGES := kmod-mt7603 kmod-mt76x2 kmod-usb3 kmod-usb-ledtrig-usbport wpad-basic
+endef
+TARGET_DEVICES += asus_rt-ac57u
+
 define Device/buffalo_wsr-1166dhp
   MTK_SOC := mt7621
   IMAGE/sysupgrade.bin := trx | pad-rootfs | append-metadata