ath79: add support for Yuncore A930

Specification:

- QCA9533 (650 MHz), 64 or 128MB RAM, 16MB SPI NOR
- 2x 10/100 Mbps Ethernet, with 802.3at PoE support (WAN)
- 2T2R 802.11b/g/n 2.4GHz

Flash instructions:

If your device comes with generic QSDK based firmware, you can login
over telnet (login: root, empty password, default IP: 192.168.188.253),
issue first (important!) 'fw_setenv' command and then perform regular
upgrade, using 'sysupgrade -n -F ...' (you can use 'wget' to download
image to the device, SSH server is not available):

  fw_setenv bootcmd "bootm 0x9f050000 || bootm 0x9fe80000"
  sysupgrade -n -F openwrt-...-yuncore_...-squashfs-sysupgrade.bin

In case your device runs firmware with YunCore custom GUI, you can use
U-Boot recovery mode:

1. Set a static IP 192.168.0.141/24 on PC and start TFTP server with
   'tftp' image renamed to 'upgrade.bin'
2. Power the device with reset button pressed and release it after 5-7
   seconds, recovery mode should start downloading image from server
   (unfortunately, there is no visible indication that recovery got
   enabled - in case of problems check TFTP server logs)

Signed-off-by: Clemens Hopfer <openwrt@wireloss.net>
Signed-off-by: Thibaut VARÈNE <hacks@slashdirt.org>
(cherry-picked from commit a05dcb0724)
[switch to mtd-mac-address instead of nvmem-cells]

package/boot/uboot-envtools/files/ath79

@@ -61,6 +61,7 @@ samsung,wam250|\
 ubnt,nanostation-m|\
 yuncore,a770|\
 yuncore,a782|\
+yuncore,a930|\
 yuncore,xd3200|\
 yuncore,xd4200|\
 zyxel,nbg6616)

target/linux/ath79/dts/qca9533_yuncore_a930.dts

@@ -0,0 +1,102 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+
+#include "qca953x.dtsi"
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+
+/ {
+	compatible = "yuncore,a930", "qca,qca9533";
+	model = "YunCore A930";
+
+	aliases {
+		label-mac-device = &eth1;
+		led-boot = &led_system;
+		led-failsafe = &led_system;
+		led-running = &led_system;
+		led-upgrade = &led_system;
+	};
+
+	keys {
+		compatible = "gpio-keys";
+
+		reset {
+			label = "reset";
+			linux,code = <KEY_RESTART>;
+			gpios = <&gpio 17 GPIO_ACTIVE_LOW>;
+			debounce-interval = <60>;
+		};
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		led_system: system {
+			label = "green:system";
+			gpios = <&gpio 12 GPIO_ACTIVE_LOW>;
+			default-state = "keep";
+		};
+
+		wlan2g {
+			label = "blue:wlan2g";
+			gpios = <&gpio 13 GPIO_ACTIVE_LOW>;
+			linux,default-trigger = "phy0tpt";
+		};
+	};
+};
+
+&spi {
+	status = "okay";
+
+	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 0x040000>;
+				read-only;
+			};
+
+			partition@40000 {
+				label = "u-boot-env";
+				reg = <0x040000 0x010000>;
+			};
+
+			partition@50000 {
+				compatible = "denx,uimage";
+				label = "firmware";
+				reg = <0x050000 0xfa0000>;
+			};
+
+			art: partition@ff0000 {
+				label = "art";
+				reg = <0xff0000 0x010000>;
+				read-only;
+			};
+		};
+	};
+};
+
+&eth0 {
+	status = "okay";
+
+	phy-handle = <&swphy4>;
+
+	mtd-mac-address = <&art 0x0>;
+};
+
+&eth1 {
+	mtd-mac-address = <&art 0x6>;
+};
+
+&wmac {
+	status = "okay";
+	mtd-cal-data = <&art 0x1000>;
+};

target/linux/ath79/image/generic.mk

@@ -2242,6 +2242,16 @@ define Device/yuncore_a782
 endef
 TARGET_DEVICES += yuncore_a782
 
+define Device/yuncore_a930
+  SOC := qca9533
+  DEVICE_VENDOR := YunCore
+  DEVICE_MODEL := A930
+  IMAGE_SIZE := 16000k
+  IMAGES += tftp.bin
+  IMAGE/tftp.bin := $$(IMAGE/sysupgrade.bin) | yuncore-tftp-header-16m
+endef
+TARGET_DEVICES += yuncore_a930
+
 define Device/yuncore_xd3200
   SOC := qca9563
   DEVICE_VENDOR := YunCore