ath79: add support for AVM FRITZ!WLAN Repeater 450E

SOC:    Qualcomm QCA9556 (Scorpion) 560MHz MIPS74Kc
RAM:    64MB Zentel A3R12E40CBF DDR2
FLASH:  16MiB Winbond W25Q128 SPI NOR
WLAN1:  QCA9556 2.4 GHz 802.11b/g/n 3x3
INPUT:  WPS button
LED:    Power, WiFi, LAN, RSSI indicator
Serial: 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.

Installation via EVA:
In the first seconds after Power is connected, the bootloader will
listen for FTP connections on 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.
You need to powercycle the device afterwards to boot OpenWRT.

Tested-by: Andreas Ziegler <dev@andreas-ziegler.de>
Signed-off-by: David Bauer <mail@david-bauer.net>

1 files changed, 76 insertions, 0 deletions

diff --git a/target/linux/ath79/dts/qca9556_avm_fritz450e.dts b/target/linux/ath79/dts/qca9556_avm_fritz450e.dts
new file mode 100644
index 0000000000..60685bd3f1
--- /dev/null
+++ b/target/linux/ath79/dts/qca9556_avm_fritz450e.dts
@@ -0,0 +1,76 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+
+#include <dt-bindings/gpio/gpio.h>
+
+#include "qca9556_avm_fritz-repeater.dtsi"
+
+/ {
+	compatible = "avm,fritz450e", "qca,qca9557";
+	model = "AVM FRITZ!WLAN Repeater 450E";
+
+	aliases {
+		led-boot = &led_power;
+		led-failsafe = &led_power;
+		led-running = &led_power;
+		led-upgrade = &led_power;
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		led_power: power {
+			label = "fritz450e:green:power";
+			gpios = <&gpio 14 GPIO_ACTIVE_HIGH>;
+		};
+
+		wlan {
+			label = "fritz450e:green:wlan";
+			gpios = <&gpio 15 GPIO_ACTIVE_LOW>;
+			linux,default-trigger = "phy0tpt";
+		};
+
+		lan {
+			label = "fritz450e:green:lan";
+			gpios = <&gpio 13 GPIO_ACTIVE_LOW>;
+		};
+
+		rssi2 {
+			label = "fritz450e:green:rssi2";
+			gpios = <&gpio 16 GPIO_ACTIVE_LOW>;
+		};
+
+		rssi3 {
+			label = "fritz450e:green:rssi3";
+			gpios = <&gpio 17 GPIO_ACTIVE_LOW>;
+		};
+
+		rssi4 {
+			label = "fritz450e:green:rssi4";
+			gpios = <&gpio 18 GPIO_ACTIVE_LOW>;
+		};
+	};
+};
+
+&gpio {
+	/*
+	 * Wondered why rssi0 and rssi1 are missing?
+	 *
+	 * AVM seems to have run low on usable GPIO pins, so
+	 * instead of adding a shift register like they did for
+	 * the 1750E they figured out "Why not use the LEDs on
+	 * the AR8033?".
+	 *
+	 * EVA configures the PHY in a way it does not display
+	 * the link-state using it's LEDs. When we reset the PHY
+	 * using the reset-mechanism of the PHY subsystem, this
+	 * setting is cleared.
+	 *
+	 * We avoid this by keeping the reset line high.
+	 */
+	phy-reset {
+		gpio-hog;
+		gpios = <11 GPIO_ACTIVE_HIGH>;
+		output-high;
+		line-name = "phy-reset";
+	};
+};