ath79: add support for YunCore A770

YunCore A770 is a ceiling AC750 AP with 2 Fast Ethernet ports, PoE
(802.3at) support, based on QCA9531 + QCA9887.

Specification:

- 650/597/216 MHz (CPU/DDR/AHB)
- 128 MB of RAM (DDR2)
- 16 MB of flash (SPI NOR)
- 2x 10/100 Mbps Ethernet (PoE 802.3at support in WAN port)
- 2T2R 2.4 GHz (QCA9531), with ext. PA and LNA
- 1T1R 5 GHz (QCA9887), with ext. FEM (SKY85728-11)
- 2x regular LED, 1x RGB LED (all driven by GPIO)
- 1x button (reset)
- DC jack for main power input (12 V)
- UART header on PCB

Flash instruction:

1. First, gain root access to the device, following below steps:

- Login into web gui (default password/IP: admin/192.168.188.253).
- Go to 'Advanced' -> 'Management' -> 'System' and download backup of
  configuration (bakfile.bin).
- Open the file as tar.gz archive, edit/update 'shadow' file and change
  hash of root password to something known.
- Repack the archive, rename it back to 'bakfile.bin' and use to
  restore configuration of the device.
- After that, device will reboot and can be accessed over SSH.

2. Then, install OpenWrt:

- Login over SSH and issue command:
  fw_setenv bootcmd "bootm 0x9f050000 || bootm 0x9fe80000"
- Upload 'sysupgrade' image and install it (only if previous command
  succeeded) with command: 'sysupgrade -n -F openwrt-...'.

Signed-off-by: Piotr Dymacz <pepe2k@gmail.com>

1 files changed, 126 insertions, 0 deletions

diff --git a/target/linux/ath79/dts/qca9531_yuncore_a770.dts b/target/linux/ath79/dts/qca9531_yuncore_a770.dts
new file mode 100644
index 0000000000..18ad6307a1
--- /dev/null
+++ b/target/linux/ath79/dts/qca9531_yuncore_a770.dts
@@ -0,0 +1,126 @@
+// 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"
+
+/ {
+	model = "YunCore A770";
+	compatible = "yuncore,a770", "qca,qca9533";
+
+	aliases {
+		led-boot = &status;
+		led-failsafe = &status;
+		led-running = &status;
+		led-upgrade = &status;
+	};
+
+	chosen {
+		bootargs = "console=ttyS0,115200n8";
+	};
+
+	keys {
+		compatible = "gpio-keys";
+
+		reset {
+			label = "reset";
+			linux,code = <KEY_RESTART>;
+			gpios = <&gpio 17 GPIO_ACTIVE_LOW>;
+			debounce-interval = <60>;
+		};
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		lan {
+			label = "a770:green:lan";
+			gpios = <&gpio 16 GPIO_ACTIVE_LOW>;
+		};
+
+		status: status {
+			label = "a770:green:status";
+			gpios = <&gpio 12 GPIO_ACTIVE_LOW>;
+			default-state = "keep";
+		};
+
+		wan {
+			label = "a770:green:wan";
+			gpios = <&gpio 4 GPIO_ACTIVE_LOW>;
+		};
+
+		wlan2g {
+			label = "a770:red:wlan2g";
+			gpios = <&gpio 13 GPIO_ACTIVE_LOW>;
+			linux,default-trigger = "phy1tpt";
+		};
+	};
+};
+
+&eth0 {
+	status = "okay";
+
+	phy-handle = <&swphy4>;
+	mtd-mac-address = <&art 0x0>;
+};
+
+&eth1 {
+	mtd-mac-address = <&art 0x6>;
+};
+
+&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>;
+			};
+
+			partition@50000 {
+				compatible = "denx,uimage";
+				label = "firmware";
+				reg = <0x050000 0xfa0000>;
+			};
+
+			art: partition@ff0000 {
+				label = "art";
+				reg = <0xff0000 0x010000>;
+				read-only;
+			};
+		};
+	};
+};
+
+&uart {
+	status = "okay";
+};
+
+&wmac {
+	status = "okay";
+
+	mtd-cal-data = <&art 0x1000>;
+};