This commit adds support for the AVM Fritz!Box 4020 WiFi-router.

SoC:   Qualcomm Atheros QCA9561 (Dragonfly) 750MHz
RAM:   Winbond W971GG6KB-25
FLASH: Macronix MX25L12835F
WiFi:  QCA9561 b/g/n 3x3 450Mbit/s
USB:   1x USB 2.0
IN:    WPS button, WiFi button
OUT:   Power LED green, Internet LED green, WLAN LED green,
       LAN LED green, INFO LED green, INFO LED red
UART:  Header Next to Black metal shield
       Pinout is 3.3V - RX - TX - GND (Square Pad is 3.3V)
       The Serial setting is 115200-8-N-1.

Tested and working:
 - Ethernet (LAN + WAN)
 - WiFi (correct MAC)
 - Installation via EVA bootloader
 - OpenWRT sysupgrade
 - Buttons
 - LEDs

Not working:
 - USB port

Installation via EVA:
In the first seconds after Power is connected, the bootloader will
listen for FTP connections on 169.254.157.1 (Might also be 192.168.178.1).
Firmware can be uploaded like following:

  ftp> quote USER adam2
  ftp> quote PASS adam2
  ftp> binary
  ftp> debug
  ftp> passive
  ftp> quote MEDIA FLSH
  ftp> put openwrt-sysupgrade.bin mtd1

Note that this procedure might take up to two minutes. After transfer is
complete you need to powercycle the device to boot OpenWRT.

Signed-off-by: David Bauer <m...@david-bauer.net>
---

v2 changes:
 - add annotation for initial output-line-state setting
 - rebase onto current master

 .../ath79/base-files/etc/board.d/01_leds      |   4 +
 .../ath79/base-files/etc/board.d/02_network   |   5 +
 .../etc/hotplug.d/firmware/10-ath9k-eeprom    |   3 +
 .../linux/ath79/dts/qca9561_avm_fritz4020.dts | 172 ++++++++++++++++++
 target/linux/ath79/image/generic.mk           |  14 ++
 .../005-gpio-74x164-add-initvals.patch        |  15 ++
 6 files changed, 213 insertions(+)
 create mode 100644 target/linux/ath79/dts/qca9561_avm_fritz4020.dts
 create mode 100644 
target/linux/ath79/patches-4.14/005-gpio-74x164-add-initvals.patch

diff --git a/target/linux/ath79/base-files/etc/board.d/01_leds 
b/target/linux/ath79/base-files/etc/board.d/01_leds
index c3dc1bbe56..f058bf599e 100755
--- a/target/linux/ath79/base-files/etc/board.d/01_leds
+++ b/target/linux/ath79/base-files/etc/board.d/01_leds
@@ -17,6 +17,10 @@ avm,fritz300e)
        ucidef_set_led_rssi "rssimediumhigh" "RSSIMEDIUMHIGH" 
"$boardname:green:rssi3" "wlan0" "60" "100"
        ucidef_set_led_rssi "rssihigh" "RSSIHIGH" "$boardname:green:rssi4" 
"wlan0" "80" "100"
        ;;
+avm,fritz4020)
+       ucidef_set_led_netdev "wan" "WAN" "$boardname:green:wan" "eth0"
+       ucidef_set_led_switch "lan" "LAN" "$boardname:green:lan" "switch0" 
"0x1E"
+       ;;
 etactica,eg200)
        ucidef_set_led_netdev "lan" "LAN" "$boardname:red:eth0" "eth0"
        ucidef_set_led_oneshot "modbus" "Modbus" "$boardname:red:modbus" "100" 
"33"
diff --git a/target/linux/ath79/base-files/etc/board.d/02_network 
b/target/linux/ath79/base-files/etc/board.d/02_network
index a29a295c56..6cd1686e23 100755
--- a/target/linux/ath79/base-files/etc/board.d/02_network
+++ b/target/linux/ath79/base-files/etc/board.d/02_network
@@ -43,6 +43,7 @@ ath79_setup_interfaces()
        etactica,eg200)
                ucidef_set_interface_lan "eth0" "dhcp"
                ;;
+       avm,fritz4020|\
        glinet,ar150|\
        glinet,ar300m)
                ucidef_set_interfaces_lan_wan "eth1" "eth0"
@@ -155,6 +156,10 @@ ath79_setup_macs()
        avm,fritz300e)
                lan_mac=$(fritz_tffs -n maca -i $(find_mtd_part "tffs (1)"))
                ;;
+       avm,fritz4020)
+               lan_mac=$(fritz_tffs -n maca -i $(find_mtd_part "tffs (1)"))
+               wan_mac=$(fritz_tffs -n macb -i $(find_mtd_part "tffs (1)"))
+               ;;
        dlink,dir-825-b1)
                lan_mac=$(mtd_get_mac_text "caldata" 65440)
                wan_mac=$(mtd_get_mac_text "caldata" 65460)
diff --git 
a/target/linux/ath79/base-files/etc/hotplug.d/firmware/10-ath9k-eeprom 
b/target/linux/ath79/base-files/etc/hotplug.d/firmware/10-ath9k-eeprom
index f71139c55c..c36b566a35 100644
--- a/target/linux/ath79/base-files/etc/hotplug.d/firmware/10-ath9k-eeprom
+++ b/target/linux/ath79/base-files/etc/hotplug.d/firmware/10-ath9k-eeprom
@@ -97,6 +97,9 @@ board=$(board_name)
 case "$FIRMWARE" in
 "ath9k-eeprom-ahb-18100000.wmac.bin")
        case $board in
+       avm,fritz4020)
+               ath9k_eeprom_extract_reverse "urlader" 5441 1088
+               ;;
        iodata,wn-ac1600dgr2)
                ath9k_eeprom_extract "art" 4096 1088
                ath9k_patch_fw_mac $(mtd_get_mac_ascii u-boot-env ethaddr) 2
diff --git a/target/linux/ath79/dts/qca9561_avm_fritz4020.dts 
b/target/linux/ath79/dts/qca9561_avm_fritz4020.dts
new file mode 100644
index 0000000000..a4e059efd4
--- /dev/null
+++ b/target/linux/ath79/dts/qca9561_avm_fritz4020.dts
@@ -0,0 +1,172 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+/dts-v1/;
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+
+#include "qca956x.dtsi"
+
+/ {
+       compatible = "avm,fritz4020", "qca,qca9560";
+       model = "AVM FRITZ!Box 4020";
+
+       aliases {
+               led-boot = &power;
+               led-failsafe = &info_red;
+               led-running = &power;
+               led-upgrade = &info_red;
+       };
+
+       chosen {
+               bootargs = "console=ttyS0,115200n8";
+       };
+
+       led_spi {
+               compatible = "spi-gpio";
+               #address-cells = <1>;
+               #size-cells = <0>;
+
+               gpio-sck = <&gpio 20 GPIO_ACTIVE_HIGH>;
+               gpio-mosi = <&gpio 19 GPIO_ACTIVE_HIGH>;
+               num-chipselects = <0>;
+
+               led_gpio: led_gpio@0 {
+                       compatible = "fairchild,74hc595";
+                       reg = <0>;
+                       gpio-controller;
+                       #gpio-cells = <2>;
+                       registers-number = <1>;
+                       lines-initial-states = /bits/ 8 <0xff>;
+                       spi-max-frequency = <10000000>;
+               };
+       };
+
+       leds {
+               compatible = "gpio-leds";
+
+               power: power {
+                       label = "fritz4020:green:power";
+                       gpios = <&led_gpio 2 GPIO_ACTIVE_LOW>;
+                       default-state = "on";
+               };
+
+               wlan {
+                       label = "fritz4020:green:wlan";
+                       gpios = <&led_gpio 3 GPIO_ACTIVE_LOW>;
+                       linux,default-trigger = "phy0tpt";
+                       default-state = "off";
+               };
+
+               lan {
+                       label = "fritz4020:green:lan";
+                       gpios = <&led_gpio 0 GPIO_ACTIVE_LOW>;
+                       default-state = "off";
+               };
+
+               wan {
+                       label = "fritz4020:green:wan";
+                       gpios = <&led_gpio 4 GPIO_ACTIVE_LOW>;
+                       default-state = "off";
+               };
+
+               info {
+                       label = "fritz4020:green:info";
+                       gpios = <&led_gpio 6 GPIO_ACTIVE_LOW>;
+                       default-state = "off";
+               };
+
+               info_red: info_red {
+                       label = "fritz4020:red:info";
+                       gpios = <&led_gpio 1 GPIO_ACTIVE_LOW>;
+                       default-state = "off";
+               };
+       };
+
+       keys {
+               compatible = "gpio-keys-polled";
+               poll-interval = <100>;
+
+               wps_button {
+                       label = "WPS button";
+                       linux,code = <KEY_WPS_BUTTON>;
+                       gpios = <&gpio 2 GPIO_ACTIVE_HIGH>;
+               };
+
+               wlan_button {
+                       label = "WLAN button";
+                       linux,code = <KEY_RFKILL>;
+                       gpios = <&gpio 21 GPIO_ACTIVE_HIGH>;
+               };
+       };
+};
+
+&uart {
+       status = "okay";
+};
+
+&gpio {
+       status = "okay";
+};
+
+&spi {
+       status = "okay";
+       num-cs = <1>;
+
+       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 = "urlader";
+                               reg = <0x000000 0x020000>;
+                               read-only;
+                       };
+
+                       partition@1 {
+                               label = "firmware";
+                               reg = <0x020000 0xee0000>;
+                       };
+
+                       partition@2 {
+                               label = "tffs (1)";
+                               reg = <0xf00000 0x080000>;
+                               read-only;
+                       };
+
+                       partition@3 {
+                               label = "tffs (2)";
+                               reg = <0xf80000 0x080000>;
+                               read-only;
+                       };
+               };
+       };
+};
+
+&eth0 {
+       status = "okay";
+
+       phy-mode = "mii";
+       phy-handle = <&swphy0>;
+
+       gmac-config {
+               device = <&gmac>;
+
+               switch-phy-addr-swap = <1>;
+               switch-phy-swap = <1>;
+       };
+};
+
+&eth1 {
+       status = "okay";
+};
+
+&wmac {
+       status = "okay";
+       qca,no-eeprom;
+};
diff --git a/target/linux/ath79/image/generic.mk 
b/target/linux/ath79/image/generic.mk
index 01020810cc..64043d7535 100644
--- a/target/linux/ath79/image/generic.mk
+++ b/target/linux/ath79/image/generic.mk
@@ -13,6 +13,20 @@ define Device/avm_fritz300e
 endef
 TARGET_DEVICES += avm_fritz300e
 
+define Device/avm_fritz4020
+  ATH_SOC := qca9561
+  DEVICE_TITLE := AVM FRITZ!Box 4020
+  IMAGE_SIZE := 15232k
+  KERNEL := kernel-bin | append-dtb | lzma | eva-image
+  KERNEL_INITRAMFS := $$(KERNEL)
+  IMAGE/sysupgrade.bin := append-kernel | pad-to 64k | \
+      append-squashfs-fakeroot-be | pad-to 256 | \
+      append-rootfs | pad-rootfs | append-metadata | check-size 
$$$$(IMAGE_SIZE)
+  DEVICE_PACKAGES := fritz-tffs
+  SUPPORTED_DEVICES += fritz4020
+endef
+TARGET_DEVICES += avm_fritz4020
+
 define Device/buffalo_wzr-hp-g450h
   ATH_SOC := ar7242
   DEVICE_TITLE := Buffalo WZR-HP-G450H
diff --git a/target/linux/ath79/patches-4.14/005-gpio-74x164-add-initvals.patch 
b/target/linux/ath79/patches-4.14/005-gpio-74x164-add-initvals.patch
new file mode 100644
index 0000000000..d72f7140c2
--- /dev/null
+++ b/target/linux/ath79/patches-4.14/005-gpio-74x164-add-initvals.patch
@@ -0,0 +1,15 @@
+Index: linux-4.14.62/drivers/gpio/gpio-74x164.c
+===================================================================
+--- linux-4.14.62.orig/drivers/gpio/gpio-74x164.c
++++ linux-4.14.62/drivers/gpio/gpio-74x164.c
+@@ -151,6 +151,10 @@ static int gen_74x164_probe(struct spi_d
+       chip->gpio_chip.parent = &spi->dev;
+       chip->gpio_chip.owner = THIS_MODULE;
+ 
++      /* Set initial output line values */
++      of_property_read_u8_array(spi->dev.of_node, "lines-initial-states", 
chip->buffer,
++                                chip->registers);
++
+       mutex_init(&chip->lock);
+ 
+       ret = __gen_74x164_write_config(chip);
-- 
2.18.0


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