ath79: add support for WD My Net N750

SoC: AR9344
RAM: 128MB
Flash: 16MiB Winbond 25Q128BVFG SPI NOR
5GHz WiFi: AR9380 PCIe 3x3:3 802.11n
2.4GHz WiFi: AR9344 (SoC) AHB 2x2:2 802.11n

5x Gigabit ethernet via AR8327N switch (green + amber LEDs)
2x USB 2.0 via GL850G hub
4x front LEDs from SoC GPIO
1x front WPS button from SoC GPIO
1x bottom reset button from SoC GPIO

Known issues:
AR8327N LEDs only have default functionality, not presented in sysfs.
This is a regression from ar71xx.

UART header JP1, 115200 no parity 1 stop
TX
GND
VCC
(N/P)
RX

See https://openwrt.org/toh/wd/n750 for flashing detail.
Procedures unchanged from ar71xx.

Tested sysupgrade + factory flash from WD Emergency Recovery

Signed-off-by: Ryan Mounce <ryan@mounce.com.au>

1 files changed, 216 insertions, 0 deletions

diff --git a/target/linux/ath79/dts/ar9344_wd_mynet-n750.dts b/target/linux/ath79/dts/ar9344_wd_mynet-n750.dts
new file mode 100644
index 0000000000..a9f7e6e9a3
--- /dev/null
+++ b/target/linux/ath79/dts/ar9344_wd_mynet-n750.dts
@@ -0,0 +1,216 @@
+// 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 "ar9344.dtsi"
+
+/ {
+	model = "Western Digital My Net N750";
+	compatible = "wd,mynet-n750", "qca,ar9344";
+
+	chosen {
+		bootargs = "console=ttyS0,115200n8";
+	};
+
+	aliases {
+		led-boot = &power;
+		led-failsafe = &power;
+		led-running = &power;
+		led-upgrade = &power;
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		wifi {
+			label = "mynet-n750:blue:wireless";
+			gpios = <&gpio 11 GPIO_ACTIVE_HIGH>;
+		};
+
+		internet {
+			label = "mynet-n750:blue:internet";
+			gpios = <&gpio 12 GPIO_ACTIVE_HIGH>;
+		};
+
+		wps {
+			label = "mynet-n750:blue:wps";
+			gpios = <&gpio 13 GPIO_ACTIVE_HIGH>;
+		};
+
+		power: power {
+			label = "mynet-n750:blue:power";
+			gpios = <&gpio 14 GPIO_ACTIVE_HIGH>;
+		};
+	};
+
+	keys {
+		compatible = "gpio-keys";
+
+		reset {
+			linux,code = <KEY_RESTART>;
+			gpios = <&gpio 17 GPIO_ACTIVE_LOW>;
+		};
+
+		wps {
+			linux,code = <KEY_WPS_BUTTON>;
+			gpios = <&gpio 19 GPIO_ACTIVE_LOW>;
+		};
+	};
+};
+
+&ref {
+	clock-frequency = <40000000>;
+};
+
+&uart {
+	status = "okay";
+};
+
+&gpio {
+	status = "okay";
+
+	gpio_ext_lna0 {
+		gpio-hog;
+		gpios = <15 0>;
+		output-high;
+		line-name = "mynet-n750:ext:lna0";
+	};
+
+	gpio_ext_lna1 {
+		gpio-hog;
+		gpios = <18 0>;
+		output-high;
+		line-name = "mynet-n750:ext:lna1";
+	};
+};
+
+&spi {
+	num-cs = <1>;
+
+	status = "okay";
+
+	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 = "bootloader";
+				reg = <0x000000 0x40000>;
+				read-only;
+			};
+
+			partition@40000 {
+				label = "bdcfg";
+				reg = <0x040000 0x10000>;
+				read-only;
+			};
+
+			partition@50000 {
+				label = "devdata";
+				reg = <0x050000 0x10000>;
+				read-only;
+			};
+
+			partition@60000 {
+				label = "devconf";
+				reg = <0x060000 0x10000>;
+				read-only;
+			};
+
+			partition@70000 {
+				compatible = "seama";
+				label = "firmware";
+				reg = <0x070000 0xf80000>;
+			};
+
+			art: partition@ff0000 {
+				label = "art";
+				reg = <0xff0000 0x010000>;
+				read-only;
+			};
+		};
+	};
+};
+
+&usb {
+	#address-cells = <1>;
+	#size-cells = <0>;
+	status = "okay";
+
+	port@1 {
+		#address-cells = <1>;
+		#size-cells = <0>;
+		reg = <1>;
+		#trigger-source-cells = <0>;
+
+		hub_port1: port@1 {
+			reg = <1>;
+			#trigger-source-cells = <0>;
+		};
+
+		hub_port2: port@2 {
+			reg = <2>;
+			#trigger-source-cells = <0>;
+		};
+	};
+};
+
+&usb_phy {
+	status = "okay";
+};
+
+&pcie {
+	status = "okay";
+
+	wifi@0,0 {
+		compatible = "pci168c,0033";
+		reg = <0x0000 0 0 0 0>;
+		qca,no-eeprom;
+	};
+};
+
+&wmac {
+	status = "okay";
+	qca,no-eeprom;
+};
+
+&mdio0 {
+	status = "okay";
+	phy-mask = <0>;
+
+	switch0@1f {
+		compatible = "qca,ar8327";
+		reg = <0x1f>;
+
+		qca,ar8327-initvals = <
+			0x04 0x07600000 /* PORT0 PAD MODE CTRL */
+			0x10 0x80000080 /* POWER_ON_STRIP */
+			0x50 0xc737c737 /* LED_CTRL0 */
+			0x54 0x00000000 /* LED_CTRL1 */
+			0x58 0x00000000 /* LED_CTRL2 */
+			0x5c 0x0030c300 /* LED_CTRL3 */
+			0x7c 0x0000007e /* PORT0_STATUS */
+			>;
+	};
+};
+
+&eth0 {
+	status = "okay";
+
+	/* default for ar934x, except for 1000M */
+	pll-data = <0x06000000 0x00000101 0x00001616>;
+
+	phy-mode = "rgmii";
+	fixed-link {
+		speed = <1000>;
+		full-duplex;
+	};
+};