ipq807x: add Redmi AX6

Redmi AX6 is a budget 802.11ax dual-band router/AP

Specifications:
* CPU: Qualcomm IPQ8071A Quad core Cortex-A53 1.4GHz
* RAM: 512MB of DDR3
* Storage: 128MB NAND
* Ethernet: 4x1G RJ45 ports (QCA8075)
* WLAN:
	* 2.4GHz: Qualcomm QCN5024 2x2 802.11b/g/n/ax 574 Mbps PHY rate
	* 5GHz: Qualcomm QCN5054 4x4@80MHz or 2x2@160MHz 802.11a/b/g/n/ac/ax 2402 PHY rate
* LEDs:
	* System (Blue/Yellow)
	* Network (Blue/Yellow)
*Buttons: 1x soft reset
*Power: 12V DC jack

Installation instructions:

Obtaining SSH access is mandatory
https://openwrt.org/inbox/toh/xiaomi/xiaomi_redmi_ax6_ax3000#ssh_access

Installation is done by the ubiformat method, through SSH:
1. Open an SSH shell to the router
2. Copy the file openwrt-ipq807x-generic-redmi_ax6-initramfs-factory.ubi to the /tmp directory
3. Check which rootfs partition is your router booted in (0 = rootfs | 1 = rootfs_1):
nvram get flag_boot_rootfs

4. Find the rootfs and rootfs_1 mtd indexes respectively:
cat /proc/mtd
Please confirm if mtd12 and mtd13 are the correct indexes from above!

5. Use the command ubiformat to flash the opposite mtd with UBI image:

If nvram get flag_boot_rootfs returned 0:
ubiformat /dev/mtd13 -y -f /tmp/openwrt-ipq807x-generic-redmi_ax6-initramfs-factory.ubi && nvram set flag_boot_rootfs=1 && nvram set flag_last_success=1 && nvram commit

otherwise:
ubiformat /dev/mtd12 -y -f /tmp/openwrt-ipq807x-generic-redmi_ax6-initramfs-factory.ubi && nvram set flag_boot_rootfs=0 && nvram set flag_last_success=0 && nvram commit

6. Reboot the device by:
reboot

Previous commands flashed an ubinized OpenWrt initramfs that will serve as the intermediate step
since OpenWrt uses unified rootfs in order to fully utilize NAND and provide enough space for packages.
Continue in order to pernamently flash OpenWrt:

7. SSH into OpenWrt from one of the LAN ports
8. Copy the file openwrt-ipq807x-generic-redmi_ax6-squashfs-sysupgrade.bin to the /tmp directory
9. Sysupgrade the device:
sysupgrade -n /tmp/openwrt-ipq807x-generic-redmi_ax6-squashfs-sysupgrade.bin

Device will reboot with OpenWrt, and then sysupgrade can be used to upgrade the device when desired.

Signed-off-by: Zhijun You <hujy652@gmail.com>

6 files changed, 59 insertions, 0 deletions

diff --git a/target/linux/ipq807x/base-files/etc/board.d/01_leds b/target/linux/ipq807x/base-files/etc/board.d/01_leds
index 215ab7ca21..a13ddcbb08 100644
--- a/target/linux/ipq807x/base-files/etc/board.d/01_leds
+++ b/target/linux/ipq807x/base-files/etc/board.d/01_leds
@@ -6,6 +6,7 @@ board_config_update
 board=$(board_name)
 
 case "$board" in
+redmi,ax6|\
 xiaomi,ax3600)
 	ucidef_set_led_netdev "wan" "WAN" "blue:network" "wan"
 	;;
diff --git a/target/linux/ipq807x/base-files/etc/board.d/02_network b/target/linux/ipq807x/base-files/etc/board.d/02_network
index 4dc118ed29..cfe7580f8e 100644
--- a/target/linux/ipq807x/base-files/etc/board.d/02_network
+++ b/target/linux/ipq807x/base-files/etc/board.d/02_network
@@ -11,6 +11,7 @@ ipq807x_setup_interfaces()
 	local board="$1"
 
 	case "$board" in
+	redmi,ax6|\
 	xiaomi,ax3600)
 		ucidef_set_interfaces_lan_wan "lan1 lan2 lan3" "wan"
 		;;
diff --git a/target/linux/ipq807x/base-files/etc/hotplug.d/firmware/11-ath11k-caldata b/target/linux/ipq807x/base-files/etc/hotplug.d/firmware/11-ath11k-caldata
index 578ff7ad45..0a2908f13d 100644
--- a/target/linux/ipq807x/base-files/etc/hotplug.d/firmware/11-ath11k-caldata
+++ b/target/linux/ipq807x/base-files/etc/hotplug.d/firmware/11-ath11k-caldata
@@ -9,6 +9,7 @@ board=$(board_name)
 case "$FIRMWARE" in
 "ath11k/IPQ8074/hw2.0/cal-ahb-c000000.wifi.bin")
 	case "$board" in
+	redmi,ax6|\
 	xiaomi,ax3600)
 		caldata_extract "0:art" 0x1000 0x20000
 		;;
diff --git a/target/linux/ipq807x/base-files/lib/upgrade/platform.sh b/target/linux/ipq807x/base-files/lib/upgrade/platform.sh
index d63e71251b..f9c28fad09 100644
--- a/target/linux/ipq807x/base-files/lib/upgrade/platform.sh
+++ b/target/linux/ipq807x/base-files/lib/upgrade/platform.sh
@@ -33,6 +33,7 @@ platform_check_image() {
 
 platform_pre_upgrade() {
 	case "$(board_name)" in
+	redmi,ax6|\
 	xiaomi,ax3600)
 		xiaomi_initramfs_prepare
 		;;
@@ -41,6 +42,7 @@ platform_pre_upgrade() {
 
 platform_do_upgrade() {
 	case "$(board_name)" in
+	redmi,ax6|\
 	xiaomi,ax3600)
 		# Make sure that UART is enabled
 		fw_setenv boot_wait on
diff --git a/target/linux/ipq807x/files/arch/arm64/boot/dts/qcom/ipq8071-ax6.dts b/target/linux/ipq807x/files/arch/arm64/boot/dts/qcom/ipq8071-ax6.dts
new file mode 100644
index 0000000000..6611a8fe27
--- /dev/null
+++ b/target/linux/ipq807x/files/arch/arm64/boot/dts/qcom/ipq8071-ax6.dts
@@ -0,0 +1,46 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+/* Copyright (c) 2021, Zhijun You <hujy652@gmail.com> */
+
+/dts-v1/;
+
+#include "ipq8071-ax3600.dtsi"
+
+/ {
+	model = "Redmi AX6";
+	compatible = "redmi,ax6", "qcom,ipq8074";
+
+	leds {
+		compatible = "gpio-leds";
+
+		led_system_blue: system-blue {
+			label = "blue:system";
+			gpios = <&tlmm 21 GPIO_ACTIVE_HIGH>;
+		};
+
+		led_system_yellow: system-yellow {
+			label = "yellow:system";
+			gpios = <&tlmm 22 GPIO_ACTIVE_HIGH>;
+		};
+
+		network-blue {
+			label = "blue:network";
+			gpios = <&tlmm 42 GPIO_ACTIVE_HIGH>;
+		};
+
+		network-yellow {
+			label = "yellow:network";
+			gpios = <&tlmm 43 GPIO_ACTIVE_HIGH>;
+		};
+	};
+};
+
+/* AX6 can both have NAND of 256MiB or 128MiB.
+ * To be on the safe side, assume 128MiB of NAND.
+ */
+&rootfs {
+	reg = <0x2dc0000 0x5220000>;
+};
+
+&wifi {
+	qcom,ath11k-calibration-variant = "Redmi-AX6";
+};
diff --git a/target/linux/ipq807x/image/generic.mk b/target/linux/ipq807x/image/generic.mk
index 11cca54506..7fd0169a64 100644
--- a/target/linux/ipq807x/image/generic.mk
+++ b/target/linux/ipq807x/image/generic.mk
@@ -17,6 +17,14 @@ define Device/UbiFit
 	IMAGE/sysupgrade.bin := sysupgrade-tar | append-metadata
 endef
 
+define Device/redmi_ax6
+	$(call Device/xiaomi_ax3600)
+	DEVICE_VENDOR := Redmi
+	DEVICE_MODEL := AX6
+	DEVICE_PACKAGES := ipq-wifi-redmi_ax6
+endef
+TARGET_DEVICES += redmi_ax6
+
 define Device/xiaomi_ax3600
 	$(call Device/FitImage)
 	$(call Device/UbiFit)