ath79: add support for Ubiquiti PowerBeam 5AC 500

The Ubiquiti PowerBeam 5AC 500 (PBE-5AC-500) is an outdoor 802.11ac
5 GHz bridge with a radio feed and a dish antenna.

Specifications:
 - SoC: Qualcomm Atheros QCA9558
 - RAM: 128 MB DDR2
 - Flash: 16 MB SPI NOR (mx25l12805d)
 - Ethernet: 1x 10/100/1000 Mbps Atheros 8031, 24 Vdc PoE-in
 - WiFi 5 GHz: QCA988x HW2.0 Ubiquiti target 0x4100016c chip_id 0x043222ff
 - Buttons: 1x (reset)
 - LEDs: 1x power, 1x Ethernet, 4x RSSI, all blue
 - UART: not tested

Not supported:
 - RSSI LEDs (probably through 74HC595 chip)

Installation from stock airOS firmware:
 - Follow instructions for XC-type Ubiquiti devices on OpenWrt wiki at
   https://openwrt.org/toh/ubiquiti/common

Signed-off-by: Roger Pueyo Centelles <roger.pueyo@guifi.net>

2 files changed, 106 insertions, 0 deletions

diff --git a/target/linux/ath79/dts/qca9558_ubnt_powerbeam-5ac-500.dts b/target/linux/ath79/dts/qca9558_ubnt_powerbeam-5ac-500.dts
new file mode 100644
index 0000000000..c41b9e5423
--- /dev/null
+++ b/target/linux/ath79/dts/qca9558_ubnt_powerbeam-5ac-500.dts
@@ -0,0 +1,39 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+
+#include "qca955x_ubnt_xc.dtsi"
+
+/ {
+	compatible = "ubnt,powerbeam-5ac-500", "ubnt,xc", "qca,qca9558";
+	model = "Ubiquiti PowerBeam 5AC 500";
+
+	keys {
+		compatible = "gpio-keys";
+
+		reset {
+			label = "Reset button";
+			linux,code = <KEY_RESTART>;
+			gpios = <&gpio 19 GPIO_ACTIVE_LOW>;
+			debounce-interval = <60>;
+		};
+	};
+};
+
+&mdio0 {
+	status = "okay";
+
+	phy-mask = <4>;
+	phy4: ethernet-phy@4 {
+		phy-mode = "sgmii";
+		reg = <4>;
+		at803x-override-sgmii-link-check;
+	};
+};
+
+&eth0 {
+	status = "okay";
+
+	mtd-mac-address = <&art 0x0>;
+	phy-mode = "sgmii";
+	phy-handle = <&phy4>;
+};
diff --git a/target/linux/ath79/dts/qca955x_ubnt_xc.dtsi b/target/linux/ath79/dts/qca955x_ubnt_xc.dtsi
new file mode 100644
index 0000000000..bd8ebaf040
--- /dev/null
+++ b/target/linux/ath79/dts/qca955x_ubnt_xc.dtsi
@@ -0,0 +1,67 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+
+#include "qca955x.dtsi"
+
+/ {
+	chosen {
+		bootargs = "console=ttyS0,115200n8";
+	};
+};
+
+&uart {
+	status = "okay";
+};
+
+&pcie0 {
+	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 = "u-boot";
+				reg = <0x000000 0x040000>;
+				read-only;
+			};
+
+			partition@40000 {
+				label = "u-boot-env";
+				reg = <0x040000 0x010000>;
+				read-only;
+			};
+
+			partition@50000 {
+				compatible = "denx,uimage";
+				label = "firmware";
+				reg = <0x050000 0xf60000>;
+			};
+
+			partition@fb0000 {
+				label = "cfg";
+				reg = <0xfb0000 0x040000>;
+				read-only;
+			};
+
+			art: partition@ff0000 {
+				label = "art";
+				reg = <0xff0000 0x010000>;
+				read-only;
+			};
+		};
+	};
+};