ath79: add support for TP-Link TL-WA830RE v1

This ports support for the TL-WA830RE v1 range extender from ar71xx to
ath79.

Specifications:
- SOC: Atheros AR7240
- CPU: 400MHz
- Flash: 4 MiB (Spansion S25FL032P)
- RAM: 32 MiB (Zentel A3S56D40FTP-G5)
- WLAN: Atheros AR9280 bgn 2x2
- Ethernet: 1 port (100M)

Flash instructions:
- install from u-boot with tftp (requires serial access)
  > setenv ipaddr a.b.c.d
  > setenv serverip e.f.g.h
  > tftpboot 0x80000000 \
      openwrt-ath79-tiny-tplink_tl-wa830re-v1-squashfs-factory.bin
  > erase 0x9f020000 +0x3c0000
  > cp.b 0x80000000 0x9f020000 0x3c0000
  > bootm 0x9f020000
- flash factory image from OEM WebUI
- sysupgrade from ar71xx image

The device seems to be a clone of the following devices not yet
added to ath79:
- tl-wa701nd-v1
- tl-wa730re-v1
- tl-wa801nd-v1
- tl-wa901nd-v1

Signed-off-by: Christian Buschau <christian.buschau@mailbox.org>
[make use of ar7240_tplink.dtsi, add note about clones]
Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
(cherry picked from commit fb99ac6807f29eb5fe50271eff711e7415038731)

target/linux/ath79/base-files/etc/board.d/01_leds

@@ -175,6 +175,7 @@ tplink,re450-v2)
 	;;
 tplink,tl-mr3020-v1|\
 tplink,tl-mr3040-v2|\
+tplink,tl-wa830re-v1|\
 tplink,tl-wa860re-v1)
 	ucidef_set_led_netdev "lan" "LAN" "tp-link:green:lan" "eth0"
 	;;

target/linux/ath79/base-files/etc/board.d/02_network

@@ -31,6 +31,7 @@ ath79_setup_interfaces()
 	tplink,tl-mr10u|\
 	tplink,tl-mr3020-v1|\
 	tplink,tl-mr3040-v2|\
+	tplink,tl-wa830re-v1|\
 	tplink,tl-wa850re-v1|\
 	tplink,tl-wa860re-v1|\
 	tplink,tl-wa901nd-v2|\

target/linux/ath79/base-files/etc/hotplug.d/firmware/10-ath9k-eeprom

@@ -139,6 +139,7 @@ case "$FIRMWARE" in
 		;;
 	buffalo,whr-g301n|\
 	buffalo,wzr-hp-g302h-a1a0|\
+	tplink,tl-wa830re-v1|\
 	tplink,tl-wr841-v5|\
 	tplink,tl-wr941-v4)
 		ath9k_eeprom_extract "art" 4096 3768

target/linux/ath79/dts/ar7240_tplink_tl-wa.dtsi

@@ -0,0 +1,18 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+
+#include "ar7240_tplink.dtsi"
+
+&leds {
+	lan {
+		label = "tp-link:green:lan";
+		gpios = <&gpio 13 GPIO_ACTIVE_LOW>;
+	};
+};
+
+&eth1 {
+	mtd-mac-address = <&uboot 0x1fc00>;
+};
+
+&ath9k {
+	compatible = "pci168c,002a";
+};

target/linux/ath79/dts/ar7240_tplink_tl-wa830re-v1.dts

@@ -0,0 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+/dts-v1/;
+
+#include "ar7240_tplink_tl-wa.dtsi"
+
+/ {
+	model = "TP-Link TL-WA830RE v1";
+	compatible = "tplink,tl-wa830re-v1", "qca,ar7240";
+};

target/linux/ath79/image/tiny-tp-link.mk

@@ -61,6 +61,15 @@ define Device/tplink_tl-mr3420-v2
 endef
 TARGET_DEVICES += tplink_tl-mr3420-v2
 
+define Device/tplink_tl-wa830re-v1
+  $(Device/tplink-4m)
+  ATH_SOC := ar7240
+  DEVICE_TITLE := TP-Link TL-WA830RE v1
+  TPLINK_HWID := 0x08300010
+  SUPPORTED_DEVICES += tl-wa901nd
+endef
+TARGET_DEVICES += tplink_tl-wa830re-v1
+
 define Device/tplink_tl-wa850re-v1
   $(Device/tplink-4mlzma)
   ATH_SOC := ar9341