ath79: add support for D-Link DIR-842 C3

Hardware spec of DIR-842 C3:
SoC: QCA9563
DRAM: 128MB DDR2
Flash: 16MB SPI-NOR
Switch: QCA8337N
WiFi 5.8GHz: QCA9888
WiFi 2.4Ghz: QCA9563
USB: circuit onboard, but components are not soldered

Flash instructions:

1. Upgrade the factory.bin through the factory web interface or
   the u-boot failsafe interface.
   The firmware will boot up correctly for the first time.
   Do not power off the device after OpenWrt has booted.
   Otherwise the u-boot will enter failsafe mode as the checksum
   of the firmware has been changed.
2. Upgrade the sysupgrade.bin in OpenWrt.
   After upgrading completes the u-boot won't complain about the
   firmware checksum and it's OK to use now.
3. If you powered off the device before upgrading the sysupgrade.bin,
   just upgrade the factory.bin through the u-boot failsafe interface
   and then goto step 2.

Signed-off-by: Perry Melange <isprotejesvalkata@gmail.com>

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

@@ -64,6 +64,7 @@ comfast,cf-e5)
 	;;
 dlink,dir-842-c1|\
 dlink,dir-842-c2|\
+dlink,dir-842-c3|\
 dlink,dir-859-a1)
 	ucidef_set_led_switch "internet" "WAN" "$boardname:green:internet" "switch0" "0x20"
 	;;

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

@@ -123,6 +123,7 @@ ath79_setup_interfaces()
 	dlink,dir-835-a1|\
 	dlink,dir-842-c1|\
 	dlink,dir-842-c2|\
+        dlink,dir-842-c3|\
 	dlink,dir-859-a1|\
 	engenius,epg5000|\
 	tplink,archer-c2-v3|\
@@ -316,6 +317,7 @@ ath79_setup_macs()
 		;;
 	dlink,dir-842-c1|\
 	dlink,dir-842-c2|\
+        dlink,dir-842-c3|\
 	dlink,dir-859-a1|\
 	nec,wg1200cr|\
 	wd,mynet-n750)

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

@@ -107,6 +107,7 @@ case "$FIRMWARE" in
 		;;
 	dlink,dir-842-c1|\
 	dlink,dir-842-c2|\
+        dlink,dir-842-c3|\
 	dlink,dir-859-a1|\
 	nec,wg1200cr|\
 	wd,mynet-n750)

target/linux/ath79/base-files/etc/hotplug.d/firmware/11-ath10k-caldata

@@ -191,6 +191,7 @@ case "$FIRMWARE" in
 	case $board in
 	dlink,dir-842-c1|\
 	dlink,dir-842-c2|\
+        dlink,dir-842-c3|\
 	nec,wg1200cr)
 		ath10kcal_extract "art" 20480 12064
 		ath10kcal_patch_mac_crc $(mtd_get_mac_ascii devdata wlan5mac)

target/linux/ath79/dts/qca9563_dlink_dir-842-c3.dts

@@ -0,0 +1,41 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+/dts-v1/;
+
+#include "qca9563_dlink_dir-842-c.dtsi"
+
+/ {
+	compatible = "dlink,dir-842-c3", "qca,qca9563";
+	model = "D-Link DIR-842 C3";
+
+	aliases {
+		led-boot = &power;
+		led-failsafe = &power;
+		led-running = &power;
+		led-upgrade = &power;
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		wps {
+			label = "dir-842-c3:green:wps";
+			gpios = <&gpio 8 GPIO_ACTIVE_LOW>;
+		};
+
+		power: power {
+			label = "dir-842-c3:green:power";
+			gpios = <&gpio 15 GPIO_ACTIVE_LOW>;
+		};
+
+		internet {
+			label = "dir-842-c3:green:internet";
+			gpios = <&gpio 16 GPIO_ACTIVE_LOW>;
+		};
+
+		wlan {
+			label = "dir-842-c3:green:wlan";
+			gpios = <&gpio 19 GPIO_ACTIVE_LOW>;
+			linux,default-trigger = "phy0tpt";
+		};
+	};
+};

target/linux/ath79/image/generic.mk

@@ -399,6 +399,13 @@ define Device/dlink_dir-842-c2
 endef
 TARGET_DEVICES += dlink_dir-842-c2
 
+define Device/dlink_dir-842-c3
+	$(Device/dlink_dir-842-c)
+	DEVICE_VARIANT := C3
+	DEVICE_PACKAGES := kmod-ath10k-ct ath10k-firmware-qca9888-ct
+endef
+TARGET_DEVICES += dlink_dir-842-c3
+
 define Device/elecom_wrc-1750ghbk2-i
   ATH_SOC := qca9563
   DEVICE_VENDOR := ELECOM