ath79: add support for Xiaomi Mi Router 4Q

Hardware
--------
CPU:   Qualcomm Atheros QCA9561
RAM:   64M DDR2
FLASH: 16M SPI-NOR
ETH:   1x WAN - 2x LAN
WiFi:  QCA9561 3T3R
BTN:   1x Reset - 1x WPS
LED:   1x Blue - 1x Red - 1x Yellow
UART:  TX - GND - RX - VCC (From ethernet port)
       115200n8 - 3.3V

Installation
------------
1. Connect to the device via UART.

2. Interrupt the U-Boot on power-on by pressing enter when prompted.

3. Connect you computer to one of the routers LAN ports.
   Assign yourself the IP 192.168.31.10/24.
   Copy the OpenWRT initramfs image to a tftp server root directory.
   Rename the image to 'x4q.bin'.

4. Load the initramfs image to the router by executing following command
   in U-Boot. The image will boot afterwards.

   > tftpboot 0x81000000 x4q.bin; bootm

5. SCP the sysupgrade-image into '/tmp'.
   Remember to assign yourself an IP in 192.168.1.0/24 for this step!

6. Install OpenWRT permanently by executing

   > sysupgrade -n /tmp/<OpenWRT-sysupgrade-image>

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

3 files changed, 165 insertions, 0 deletions

diff --git a/target/linux/ath79/base-files/etc/board.d/02_network b/target/linux/ath79/base-files/etc/board.d/02_network
index ef9a782d92..6bcb7f9955 100755
--- a/target/linux/ath79/base-files/etc/board.d/02_network
+++ b/target/linux/ath79/base-files/etc/board.d/02_network
@@ -216,6 +216,11 @@ ath79_setup_interfaces()
 		ucidef_add_switch "switch0" \
 			"0@eth0" "2:lan" "3:wan"
 		;;
+	xiaomi,mi-router-4q)
+		ucidef_set_interface_wan "eth0"
+		ucidef_add_switch "switch0" \
+			"0@eth1" "3:lan:1" "4:lan:2"
+		;;
 	*)
 		ucidef_set_interfaces_lan_wan "eth0" "eth1"
 		;;
diff --git a/target/linux/ath79/dts/qca9561_xiaomi_mi-router-4q.dts b/target/linux/ath79/dts/qca9561_xiaomi_mi-router-4q.dts
new file mode 100644
index 0000000000..8b8818c82f
--- /dev/null
+++ b/target/linux/ath79/dts/qca9561_xiaomi_mi-router-4q.dts
@@ -0,0 +1,153 @@
+// SPDX-License-Identifier: GPL-2.0+ OR MIT
+/dts-v1/;
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+
+#include "qca956x.dtsi"
+
+/ {
+	compatible = "xiaomi,mi-router-4q", "qca,qca9560";
+	model = "Xiaomi Mi Router 4Q";
+
+	aliases {
+		led-boot = &led_yellow;
+		led-failsafe = &led_red;
+		led-running = &led_blue;
+		led-upgrade = &led_red;
+	};
+
+	chosen {
+		bootargs = "console=ttyS0,115200n8";
+	};
+
+	keys {
+		compatible = "gpio-keys-polled";
+		poll-interval = <100>;
+
+		reset {
+			label = "Reset button";
+			linux,code = <KEY_RESTART>;
+			gpios = <&gpio 21 GPIO_ACTIVE_LOW>;
+		};
+
+		wps {
+			label = "WPS/MI button";
+			linux,code = <KEY_WPS_BUTTON>;
+			gpios = <&gpio 19 GPIO_ACTIVE_LOW>;
+		};
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		led_red: led_red {
+			label = "mi-router-4q:red:led";
+			gpios = <&gpio 1 GPIO_ACTIVE_LOW>;
+		};
+
+		led_yellow: led_yellow {
+			label = "mi-router-4q:yellow:led";
+			gpios = <&gpio 22 GPIO_ACTIVE_LOW>;
+		};
+
+		led_blue: led_blue {
+			label = "mi-router-4q:blue:led";
+			gpios = <&gpio 14 GPIO_ACTIVE_LOW>;
+		};
+	};
+};
+
+&uart {
+	status = "okay";
+};
+
+&gpio {
+	status = "okay";
+};
+
+&spi {
+	status = "okay";
+	num-cs = <1>;
+
+	flash@0 {
+		compatible = "jedec,spi-nor";
+		reg = <0>;
+		spi-max-frequency = <25000000>;
+
+		partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			partition@0 {
+				label = "u-boot";
+				reg = <0x000000 0x30000>;
+				read-only;
+			};
+
+			partition@30000 {
+				label = "nvram";
+				reg = <0x030000 0x10000>;
+				read-only;
+			};
+
+			partition@40000 {
+				label = "boarddata";
+				reg = <0x40000 0x10000>;
+				read-only;
+			};
+
+			partition@50000 {
+				label = "crash";
+				reg = <0x50000 0x10000>;
+				read-only;
+			};
+
+			art: partition@60000 {
+				label = "art";
+				reg = <0x60000 0x10000>;
+				read-only;
+			};
+
+			partition@70000 {
+				label = "cfg_bak";
+				reg = <0x70000 0x20000>;
+				read-only;
+			};
+
+			partition@90000 {
+				label = "overlay";
+				reg = <0x90000 0x170000>;
+				read-only;
+			};
+
+			partition@200000 {
+				compatible = "denx,uimage";
+				label = "firmware";
+				reg = <0x200000 0xe00000>;
+			};
+		};
+	};
+};
+
+&eth0 {
+	status = "okay";
+
+	phy-handle = <&swphy4>;
+	mtd-mac-address = <&art 0x0>;
+};
+
+&eth1 {
+	status = "okay";
+
+	mtd-mac-address = <&art 0x6>;
+};
+
+&wmac {
+	status = "okay";
+
+	mtd-cal-data = <&art 0x1000>;
+	mtd-mac-address = <&art 0x0>;
+	mtd-mac-address-increment = <1>;
+};
diff --git a/target/linux/ath79/image/generic.mk b/target/linux/ath79/image/generic.mk
index 9d0412fe97..94dfe3d4d7 100644
--- a/target/linux/ath79/image/generic.mk
+++ b/target/linux/ath79/image/generic.mk
@@ -528,3 +528,10 @@ define Device/winchannel_wb2000
   DEVICE_PACKAGES := kmod-i2c-core kmod-i2c-gpio kmod-rtc-ds1307 kmod-usb2 kmod-usb-ledtrig-usbport
 endef
 TARGET_DEVICES += winchannel_wb2000
+
+define Device/xiaomi_mi-router-4q
+  ATH_SOC := qca9561
+  DEVICE_TITLE := Xiaomi Mi Router 4Q
+  IMAGE_SIZE := 14336k
+endef
+TARGET_DEVICES += xiaomi_mi-router-4q