ath79: add support for TP-Link EAP245-v3

TP-Link EAP245 v3 is an AC1750 (802.11ac Wave-2) ceiling mount access
point. UART access (for debricking) requires non-trivial soldering.

Specifications:
* SoC: QCA9563 (CPU/DDR/AHB @ 775/650/258 MHz)
* RAM: 128MiB
* Flash: 16MiB SPI-NOR
* Wireless 2.4GHz (SoC): b/g/n 3x3
* Wireless 5GHz (QCA9982): a/n/ac 3x3 with MU-MIMO
* Ethernet (QCA8337N switch): 2× 1GbE, ETH1 (802.3at PoE) and ETH2
* Green and amber status LEDs
* Reset switch (GPIO, available for failsafe)

Flashing instructions:
All recent firmware versions (latest is 2.20.0), can disable firmware
signature verification and use a padded firmware file to flash OpenWrt:
* ssh into target device and run `cliclientd stopcs`
* upload factory image via web interface

The stopcs-method is supported from firmware version 2.3.0. Earlier
versions need to be upgraded to a newer stock version before flashing
OpenWrt.

Factory images for these devices are RSA signed by TP-Link. While the
signature verification can be disabled, the factory image still needs to
have a (fake) 1024 bit signature added to pass file checks.

Debricking instructions:
You can recover using u-boot via the serial port:
* Serial port is available from J3 (1:TX, 2:RX, 3:GND, 4:3.3V)
* Bridge R237 to connect RX, located next to J3
* Bridge R225 to connect TX, located inside can on back-side of board
* Serial port is 115200 baud, 8n1, interrupt u-boot by holding ctrl+B
* Upload initramfs with tftp and upgrade via OpenWrt

Device mac addresses:
Stock firmware has the same mac address for 2.4GHz wireless and
ethernet, 5GHz is incremented by one. The base mac address is stored in
the 'default-mac' partition (offset 0x90000) at an offset of 8 bytes.
ART blobs contain no mac addresses.
From OEM ifconfig:
    ath0      Link encap:Ethernet  HWaddr 74:..:E2
    ath10     Link encap:Ethernet  HWaddr 74:..:E3
    br0       Link encap:Ethernet  HWaddr 74:..:E2
    eth0      Link encap:Ethernet  HWaddr 74:..:E2

Signed-off-by: Sander Vanheule <sander@svanheule.net>
Tested-by: Stijn Tintel <stijn@linux-ipv6.be>

1 files changed, 163 insertions, 0 deletions

diff --git a/target/linux/ath79/dts/qca9563_tplink_eap245-v3.dts b/target/linux/ath79/dts/qca9563_tplink_eap245-v3.dts
new file mode 100644
index 0000000000..f9e3f0a696
--- /dev/null
+++ b/target/linux/ath79/dts/qca9563_tplink_eap245-v3.dts
@@ -0,0 +1,163 @@
+// 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 = "tplink,eap245-v3", "qca,qca9563";
+	model = "TP-Link EAP245 v3";
+
+	aliases {
+		led-boot = &led_status_green;
+		led-failsafe = &led_status_amber;
+		led-running = &led_status_green;
+		led-upgrade = &led_status_amber;
+		label-mac-device = &eth0;
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		led_status_green: status_green {
+			label = "tp-link:green:status";
+			gpios = <&gpio 7 GPIO_ACTIVE_HIGH>;
+			default-state = "on";
+		};
+
+		led_status_amber: status_amber {
+			label = "tp-link:amber:status";
+			gpios = <&gpio 9 GPIO_ACTIVE_HIGH>;
+		};
+	};
+
+	keys {
+		compatible = "gpio-keys";
+
+		reset {
+			label = "Reset button";
+			linux,code = <KEY_RESTART>;
+			gpios = <&gpio 2 GPIO_ACTIVE_LOW>;
+			debounce-interval = <60>;
+		};
+	};
+};
+
+&pcie {
+	status = "okay";
+};
+
+&uart {
+	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 = "factory-boot";
+				reg = <0x000000 0x040000>;
+				read-only;
+			};
+
+			partition@40000 {
+				label = "u-boot";
+				reg = <0x040000 0x040000>;
+				read-only;
+			};
+
+			partition@80000 {
+				label = "partition-table";
+				reg = <0x080000 0x010000>;
+				read-only;
+			};
+
+			info: partition@90000 {
+				label = "info";
+				reg = <0x090000 0x010000>;
+				read-only;
+			};
+
+			art: partition@a0000 {
+				label = "art";
+				reg = <0x0a0000 0x010000>;
+				read-only;
+			};
+
+			partition@b0000 {
+				label = "extra-para";
+				reg = <0x0b0000 0x010000>;
+				read-only;
+			};
+
+			partition@c0000 {
+				compatible = "openwrt,elf";
+				label = "firmware";
+				reg = <0x0c0000 0xe40000>;
+			};
+
+			partition@f00000 {
+				label = "config";
+				reg = <0xf00000 0x030000>;
+				read-only;
+			};
+
+			partition@f30000 {
+				label = "mutil-log";
+				reg = <0xf30000 0x080000>;
+				read-only;
+			};
+
+			partition@fb0000 {
+				label = "oops";
+				reg = <0xfb0000 0x040000>;
+				read-only;
+			};
+		};
+	};
+};
+
+&mdio0 {
+	status = "okay";
+
+	phy-mask = <0x1>;
+
+	phy0: ethernet-phy@0 {
+		reg = <0>;
+		phy-mode = "sgmii";
+		qca,ar8327-initvals = <
+			0x04 0x00080080 /* PAD0 */
+			0x7c 0x0000007e /* PORT0_STATUS */
+			0xe0 0xc74164de /* SGMII_CTRL */
+			>;
+	};
+};
+
+&eth0 {
+	status = "okay";
+
+	phy-handle = <&phy0>;
+	phy-mode = "sgmii";
+
+	mtd-mac-address = <&info 0x8>;
+};
+
+&wmac {
+	status = "okay";
+
+	mtd-cal-data = <&art 0x1000>;
+	mtd-mac-address = <&info 0x8>;
+};