ath79: add support for Joy-IT JT-OR750i

Specifications:
 * QCA9531, 16 MiB flash (Winbond W25Q128JVSQ), 128 MiB RAM
 * 802.11n 2T2R (external antennas)
 * QCA9887, 802.11ac 1T1R (connected with diplexer to one of the antennas)
 * 3x 10/100 LAN, 1x 10/100 WAN
 * UART header with pinout printed on PCB

Installation:
 * The device comes with a bootloader installed only
 * The bootloader offers DHCP and is reachable at http://10.123.123.1
 * Accept the agreement and flash sysupgrade.bin
 * Use Firefox if flashing does not work

TFTP recovery with static IP:
 * Rename sysupgrade.bin to jt-or750i_firmware.bin
 * Offer it via TFTP server at 192.168.0.66
 * Keep the reset button pressed for 4 seconds after connecting power

TFTP recovery with dynamic IP:
 * Rename sysupgrade.bin to jt-or750i_firmware.bin
 * Offer it via TFTP server with a DHCP server running at the same address
 * Keep the reset button pressed for 6 seconds after connecting power

Co-authored-by: Sebastian Schaper <openwrt@sebastianschaper.net>
Signed-off-by: Vincent Wiemann <vincent.wiemann@ironai.com>
(cherry picked from commit 55b4b3655263984b92e4b9fc515a5e6b8003c655)

1 files changed, 119 insertions, 0 deletions

diff --git a/target/linux/ath79/dts/qca9531_joyit_jt-or750i.dts b/target/linux/ath79/dts/qca9531_joyit_jt-or750i.dts
new file mode 100644
index 0000000000..976d342f97
--- /dev/null
+++ b/target/linux/ath79/dts/qca9531_joyit_jt-or750i.dts
@@ -0,0 +1,119 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+
+#include "qca953x.dtsi"
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+
+/ {
+	compatible = "joyit,jt-or750i", "qca,qca9531";
+	model = "Joy-IT JT-OR750i";
+
+	aliases {
+		led-boot = &led_status_green;
+		led-failsafe = &led_status_red;
+		led-running = &led_status_green;
+		led-upgrade = &led_status_red;
+		label-mac-device = &eth0;
+	};
+
+	keys {
+		compatible = "gpio-keys";
+
+		reset {
+			label = "reset";
+			linux,code = <KEY_RESTART>;
+			gpios = <&gpio 17 GPIO_ACTIVE_LOW>;
+		};
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		led_status_green: status_green {
+			label = "green:status";
+			gpios = <&gpio 13 GPIO_ACTIVE_LOW>;
+			default-state = "on";
+		};
+
+		led_status_red: status_red {
+			label = "red:status";
+			gpios = <&gpio 12 GPIO_ACTIVE_LOW>;
+		};
+	};
+};
+
+&pinmux {
+	pinmux_led_eth_pins: pinmux_led_eth_pins {
+		pinctrl-single,bits = \
+			/* GPIO 4: LED_LINK_5 (WAN) */     \
+			<0x04 0x0000002d 0x000000ff>,      \
+			/* GPIO 14: LED_LINK_2 (LAN 3) */  \
+			/* GPIO 15: LED_LINK_3 (LAN 2) */  \
+			<0x0c 0x2b2c0000 0xffff0000>,      \
+			/* GPIO 16: LED_LINK_4 (LAN 1) */  \
+			<0x10 0x0000002a 0x000000ff>;
+	};
+};
+
+&spi {
+	status = "okay";
+
+	flash@0 {
+		compatible = "jedec,spi-nor";
+		reg = <0>;
+		spi-max-frequency = <50000000>;
+
+		partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			partition@0 {
+				label = "u-boot";
+				reg = <0x0 0x40000>;
+				read-only;
+			};
+
+			partition@40000 {
+				label = "u-boot-env";
+				reg = <0x40000 0x10000>;
+				read-only;
+			};
+
+			partition@50000 {
+				label = "firmware";
+				reg = <0x50000 0xfa0000>;
+				compatible = "denx,uimage";
+			};
+
+			art: partition@ff0000 {
+				label = "art";
+				reg = <0xff0000 0x10000>;
+				read-only;
+			};
+		};
+	};
+};
+
+&eth0 {
+	status = "okay";
+
+	phy-handle = <&swphy4>;
+
+	mtd-mac-address = <&art 0x0>;
+};
+
+&eth1 {
+	mtd-mac-address = <&art 0x6>;
+};
+
+&pcie0 {
+	status = "okay";
+};
+
+&wmac {
+	status = "okay";
+
+	mtd-cal-data = <&art 0x1000>;
+};