ath79: add support for EnGenius EWS511AP

EnGenius EWS511AP is a wireless managed wall AP with PoE support,
based on Qualcomm/Atheros QCA9531(Honeybee) + QCA9887.

Short specification:

- 128MB of RAM
- 16 MB of SPI FLASH
- 2T2R 2.4 GHz (QCA9531), 802.11b/g/n
- 1T1R 5 GHz (QCA9887), 802.11ac/n/a
- 2x 10/100 Mbps Ethernet (one port with PoE support)
- 1x Power LED, 2x LAN LEDs, 1x WLAN 2.4G LED, 1x WLAN 5G LED
- 1x RESET button
- built-in watchdog chipset

Flash instruction:

From EnGenius firmware to OpenWrt firmware:

Original firmware is based on QSDK.
Use sysupgrade firmware directly in vendor GUI.
Reset to factory default is necessary.

From OpenWrt firmware to EnGenius firmware:

1. Setup a TFTP server on your computer and configure static IP to 192.168.99.8
   Put the OpenWrt firmware in the root directory on your computer.
2. Power up EWS511AP. Press 4 and then press any key to enter u-boot.
3. Download OpenWrt firmware
   (ath)> tftpboot 0x80060000 ${dir}"openwrt-ath79-generic-engenius_ews511ap-squashfs-sysupgrade.bin"
4. Flash the firmware
   (ath)> erase 0x9f060000 +f50000
   (ath)> cp.b $fileaddr 0x9f060000 $filesize
5. Reboot
   (ath)> reset

Signed-off-by: Guan-Hong Lin <GH.Lin@senao.com>

1 files changed, 144 insertions, 0 deletions

diff --git a/target/linux/ath79/dts/qca9531_engenius_ews511ap.dts b/target/linux/ath79/dts/qca9531_engenius_ews511ap.dts
new file mode 100644
index 0000000000..62b6a766fc
--- /dev/null
+++ b/target/linux/ath79/dts/qca9531_engenius_ews511ap.dts
@@ -0,0 +1,144 @@
+// 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 "qca953x.dtsi"
+
+/ {
+	compatible = "engenius,ews511ap", "qca,qca9531";
+	model = "EnGenius EWS511AP";
+
+	keys {
+		compatible = "gpio-keys-polled";
+
+		poll-interval = <20>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&jtag_disable_pins>;
+
+		reset {
+			label = "reset";
+			linux,code = <KEY_RESTART>;
+			gpios = <&gpio 1 GPIO_ACTIVE_LOW>;
+		};
+	};
+
+	aliases {
+		led-boot = &power_led;
+		led-failsafe = &power_led;
+		led-running = &power_led;
+		led-upgrade = &power_led;
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		power_led: power {
+			label = "ews511ap:amber:power";
+			gpios = <&gpio 0 GPIO_ACTIVE_LOW>;
+			default-state = "on";
+		};
+
+		lan1 {
+			label = "ews511ap:blue:lan1";
+			gpios = <&gpio 4 GPIO_ACTIVE_LOW>;
+		};
+
+		lan2 {
+			label = "ews511ap:blue:lan2";
+			gpios = <&gpio 13 GPIO_ACTIVE_LOW>;
+		};
+
+		wlan2g {
+			label = "ews511ap:green:wlan2g";
+			gpios = <&gpio 15 GPIO_ACTIVE_LOW>;
+			linux,default-trigger = "phy0tpt";
+		};
+
+		wlan5g {
+			label = "ews511ap:green:wlan5g";
+			gpios = <&gpio 3 GPIO_ACTIVE_LOW>;
+			linux,default-trigger = "phy1tpt";
+		};
+	};
+
+	watchdog {
+		compatible = "linux,wdt-gpio";
+
+		gpios = <&gpio 12 GPIO_ACTIVE_LOW>;
+		hw_algo = "toggle";
+		/* hw_margin_ms is actually 300s but driver limits it to 60s */
+		hw_margin_ms = <60000>;
+		always-running;
+	};
+};
+
+&wdt {
+	status = "okay";
+};
+
+&rst {
+	status = "okay";
+};
+
+&pcie0 {
+	status = "okay";
+};
+
+&uart {
+	status = "okay";
+};
+
+&spi {
+	status = "okay";
+	num-cs = <0>;
+
+	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 = "u-boot";
+				reg = <0x000000 0x040000>;
+				read-only;
+			};
+
+			ubootenv: partition@40000 {
+				label = "u-boot-env";
+				reg = <0x040000 0x010000>;
+			};
+
+			art: partition@50000 {
+				label = "art";
+				reg = <0x050000 0x010000>;
+			};
+
+			partition@60000 {
+				compatible = "denx,uimage";
+				label = "firmware";
+				reg = <0x060000 0xfa0000>;
+			};
+		};
+	};
+};
+
+&eth0 {
+	status = "okay";
+	phy-handle = <&swphy4>;
+};
+
+&eth1 {
+	status = "okay";
+};
+
+&wmac {
+	status = "okay";
+	mtd-cal-data = <&art 0x1000>;
+};