ath79: Add support for TP-Link CPE210 v2

This PR adds support for a popular low-cost 2.4GHz N based AP

Specifications:
 - SoC: Qualcomm Atheros QCA9533 (650MHz)
 - RAM: 64MB
 - Storage: 8 MB SPI NOR
 - Wireless: 2.4GHz N based built into SoC 2x2
 - Ethernet: 1x 100/10 Mbps, integrated into SoC, 24V POE IN

Installation:
Flash factory image through stock firmware WEB UI
or through TFTP
To get to TFTP recovery just hold reset button while powering on
for around 4-5 seconds and release.
Rename factory image to recovery.bin
Stock TFTP server IP:192.168.0.100
Stock device TFTP adress:192.168.0.254

This is based on the support patch for the identical CPE210 v3
by Mario Schroen <m.schroen@web.de>.

Tested-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
[renamed dtsi filename]
Signed-off-by: Petr Štetiar <ynezz@true.cz>

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

@@ -123,6 +123,7 @@ tplink,archer-c6-v2)
 	ucidef_set_led_switch "lan" "LAN" "tp-link:green:lan" "switch0" "0x3C"
 	ucidef_set_led_switch "wan" "WAN" "tp-link:green:wan" "switch0" "0x02"
 	;;
+tplink,cpe210-v2|\
 tplink,cpe210-v3)
 	ucidef_set_led_netdev "lan" "LAN" "tp-link:green:lan" "eth0"
 	ucidef_set_rssimon "wlan0" "200000" "1"

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

@@ -19,6 +19,7 @@ ath79_setup_interfaces()
 	pcs,cap324|\
 	pisen,wmm003n|\
 	pqi,air-pen|\
+	tplink,cpe210-v2|\
 	tplink,cpe210-v3|\
 	tplink,re350k-v1|\
 	tplink,re450-v2|\

target/linux/ath79/dts/qca9533_tplink_cpe210-v2.dts

@@ -0,0 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+/dts-v1/;
+
+#include "qca9533_tplink_cpe210.dtsi"
+
+/ {
+	compatible = "tplink,cpe210-v2", "qca,qca9533";
+	model = "TP-LINK CPE210 v2";
+};

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

@@ -109,6 +109,19 @@ define Device/tplink_archer-c7-v5
 endef
 TARGET_DEVICES += tplink_archer-c7-v5
 
+define Device/tplink_cpe210-v2
+  $(Device/tplink-safeloader)
+  ATH_SOC := qca9533
+  IMAGE_SIZE := 7680k
+  DEVICE_TITLE := TP-Link CPE210 v2
+  TPLINK_BOARD_ID := CPE210V2
+  DEVICE_PACKAGES := rssileds
+  LOADER_TYPE := elf
+  KERNEL := kernel-bin | append-dtb | lzma | tplink-v1-header -O
+  SUPPORTED_DEVICES += cpe210-v2
+endef
+TARGET_DEVICES += tplink_cpe210-v2
+
 define Device/tplink_cpe210-v3
   $(Device/tplink-safeloader)
   ATH_SOC := qca9533