ath79: add support for ZiKing CPE46B

ZiKing CPE46B is a POE outdoor 2.4ghz device with an integrated directional
antenna. It is low cost and mostly available via Aliexpress, references can
be found at:
- https://forum.openwrt.org/t/anddear-ziking-cpe46b-ar9331-ap121/60383
- https://git.lsd.cat/g/openwrt-cpe46b

Specifications:

- Atheros AR9330
- 32MB of RAM
- 8MB of flash (SPI NOR)
- 1 * 2.4ghz integrated antenna
- 2 * 10/100/1000 ethernet ports (1 POE)
- 3 * Green LEDs controlled by the SoC
- 3 * Green LEDs controlled via GPIO
- 1 * Reset Button controlled via GPIO
- 1 * 4 pin serial header on the PCB
- Outdoor packaging

Flashing instruction:

You can use sysupgrade image directly in vendor firmware which is based
on OpenWrt/LEDE. In case of issues with the vendor GUI, the vendor
Telnet console is vulnerable to command injection and can be used to gain
a shell directly on the OEM OpenWrt distribution.

Signed-off-by: Giulio Lorenzo <salveenee@mortemale.org>
[fix whitespaces, drop redundant uart status and serial0, drop
num-chipselects, drop 0x1002 MAC address for wmac]
Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>

package/boot/uboot-envtools/files/ath79

@@ -61,6 +61,7 @@ ubnt,nanostation-m|\
 yuncore,a770|\
 yuncore,a782|\
 yuncore,xd4200|\
+ziking,cpe46b|\
 zyxel,nbg6616)
 	ubootenv_add_uci_config "/dev/mtd1" "0x0" "0x10000" "0x10000"
 	;;

target/linux/ath79/dts/ar9330_ziking_cpe46b.dts

@@ -0,0 +1,103 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+
+#include "ar9330.dtsi"
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+
+/ {
+	model = "ZiKing CPE46B";
+	compatible = "ziking,cpe46b", "qca,ar9330";
+
+	aliases {
+		label-mac-device = &eth0;
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		wlan {
+			label = "green:wlan";
+			gpios = <&gpio 0 GPIO_ACTIVE_HIGH>;
+			linux,default-trigger = "phy0tpt";
+		};
+
+		rssi1 {
+			label = "green:rssi1";
+			gpios = <&gpio 20 GPIO_ACTIVE_HIGH>;
+		};
+
+		rssi2 {
+			label = "green:rssi2";
+			gpios = <&gpio 23 GPIO_ACTIVE_HIGH>;
+		};
+	};
+
+	keys {
+		compatible = "gpio-keys";
+
+		reset {
+			label = "reset";
+			linux,code = <KEY_RESTART>;
+			gpios = <&gpio 12 GPIO_ACTIVE_LOW>;
+		};
+	};
+};
+
+&spi {
+	status = "okay";
+
+	flash@0 {
+		compatible = "jedec,spi-nor";
+		spi-max-frequency = <50000000>;
+		reg = <0>;
+
+		partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			partition@0 {
+				label = "u-boot";
+				reg = <0x000000 0x010000>;
+				read-only;
+			};
+
+			partition@10000 {
+				label = "u-boot-env";
+				reg = <0x010000 0x010000>;
+			};
+
+			partition@20000 {
+				compatible = "denx,uimage";
+				label = "firmware";
+				reg = <0x020000 0x7d0000>;
+			};
+
+			art: partition@7f0000 {
+				label = "art";
+				reg = <0x7f0000 0x010000>;
+				read-only;
+			};
+		};
+	};
+};
+
+&eth0 {
+	status = "okay";
+
+	mtd-mac-address = <&art 0x0>;
+};
+
+&eth1 {
+	status = "okay";
+
+	mtd-mac-address = <&art 0x0>;
+	mtd-mac-address-increment = <2>;
+};
+
+&wmac {
+	status = "okay";
+
+	mtd-cal-data = <&art 0x1000>;
+};

target/linux/ath79/image/generic.mk

@@ -2232,6 +2232,15 @@ define Device/yuncore_xd4200
 endef
 TARGET_DEVICES += yuncore_xd4200
 
+define Device/ziking_cpe46b
+  SOC := ar9330
+  DEVICE_VENDOR := ZiKing
+  DEVICE_MODEL := CPE46B
+  IMAGE_SIZE := 8000k
+  DEVICE_PACKAGES := kmod-i2c-gpio
+endef
+TARGET_DEVICES += ziking_cpe46b
+
 define Device/zbtlink_zbt-wd323
   SOC := ar9344
   DEVICE_VENDOR := ZBT