ath79: add support for MikroTik SXT 5nD r2 (SXT Lite5)

The MikroTik SXT Lite5 (product code RBSXT5nDr2, also SXT 5nD r2) is
an outdoor 5GHz CPE with a 16 dBi integrated antenna built around the
Atheros AR9344 SoC. It is based on the "sxt5n" board platform.

Specifications:
 - SoC: Atheros AR9344
 - RAM: 64 MB
 - Storage: 128 MB NAND
 - Wireless: Atheros AR9340 (SoC) 802.11a/n 2x2:2
 - Ethernet: Atheros AR8229 switch (SoC), 1x 10/100 port,
    8-32 Vdc PoE in
 - 6 user-controllable LEDs:
  · 1x power (blue)
  · 1x wlan (green)
  · 4x rssi (green)
 - 1 GPIO-controlled buzzer

 See https://mikrotik.com/product/RBSXT5nDr2 for more details.

Notes:
 The device was already supported in the ar71xx target. There, the
 Ethernet port was handled by GMAC1. Here in ath79 it is handled by
 GMAC0, which allows to get link information (loss, speed, duplex) on
 the eth0 interface.

Flashing:
 TFTP boot initramfs image and then perform sysupgrade. Follow common
 MikroTik procedure as in https://openwrt.org/toh/mikrotik/common.

Acknowledgments:
 Michael Pratt (@mpratt14) for helping on the network settings.

Signed-off-by: Roger Pueyo Centelles <roger.pueyo@guifi.net>
[rebase, use mikrotik LED label prefix, make names consistent,
add reg for bootloader2, use led_user for boot indication etc.,
minor cosmetic changes]
Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>

1 files changed, 193 insertions, 0 deletions

diff --git a/target/linux/ath79/dts/ar9344_mikrotik_routerboard-sxt-5n.dtsi b/target/linux/ath79/dts/ar9344_mikrotik_routerboard-sxt-5n.dtsi
new file mode 100644
index 0000000000..100976e2c8
--- /dev/null
+++ b/target/linux/ath79/dts/ar9344_mikrotik_routerboard-sxt-5n.dtsi
@@ -0,0 +1,193 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+
+#include "ar9344.dtsi"
+
+/ {
+	compatible = "mikrotik,routerboard-sxt-5n", "qca,ar9344";
+	model = "MikroTik SXT 5N platform";
+
+	aliases {
+		led-boot = &led_user;
+		led-failsafe = &led_user;
+		led-running = &led_user;
+		led-upgrade = &led_user;
+		serial0 = &uart;
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		power {
+			label = "mikrotik:green:power";
+			gpios = <&gpio 11 GPIO_ACTIVE_HIGH>;
+			default-state = "on";
+		};
+
+		rssilow {
+			label = "mikrotik:green:rssilow";
+			gpios = <&gpio 13 GPIO_ACTIVE_LOW>;
+		};
+
+		rssimediumlow {
+			label = "mikrotik:green:rssimediumlow";
+			gpios = <&gpio 12 GPIO_ACTIVE_LOW>;
+		};
+
+		rssimedium {
+			label = "mikrotik:green:rssimedium";
+			gpios = <&gpio 4 GPIO_ACTIVE_LOW>;
+		};
+
+		rssimediumhigh {
+			label = "mikrotik:green:rssimediumhigh";
+			gpios = <&gpio 21 GPIO_ACTIVE_LOW>;
+		};
+
+		rssihigh {
+			label = "mikrotik:green:rssihigh";
+			gpios = <&gpio 18 GPIO_ACTIVE_LOW>;
+		};
+
+		led_user: user {
+			label = "mikrotik:green:user";
+			gpios = <&gpio 3 GPIO_ACTIVE_LOW>;
+		};
+	};
+
+	keys {
+		compatible = "gpio-keys";
+
+		reset {
+			label = "reset";
+			linux,code = <KEY_RESTART>;
+			gpios = <&gpio 15 GPIO_ACTIVE_LOW>;
+			debounce-interval = <60>;
+		};
+	};
+
+	gpio-export {
+		compatible = "gpio-export";
+
+		gpio_nand_power {
+			gpio-export,name = "sxt5n:power:nand";
+			gpio-export,output = <0>;
+			gpios = <&gpio 14 GPIO_ACTIVE_LOW>;
+		};
+	};
+
+	beeper {
+		compatible = "gpio-beeper";
+		gpios = <&gpio 19 GPIO_ACTIVE_HIGH>;
+	};
+};
+
+&spi {
+	status = "okay";
+
+	num-cs = <1>;
+
+	flash@0 {
+		compatible = "jedec,spi-nor";
+		reg = <0>;
+		spi-max-frequency = <40000000>;
+
+		partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			partition@0 {
+				label = "RouterBoot";
+				reg = <0x0 0x20000>;
+				read-only;
+				compatible = "mikrotik,routerboot-partitions";
+				#address-cells = <1>;
+				#size-cells = <1>;
+
+				partition@0 {
+					label = "bootloader1";
+					reg = <0x0 0x0>;
+					read-only;
+				};
+
+				hard_config: hard_config {
+					read-only;
+				};
+
+				bios {
+					size = <0x1000>;
+					read-only;
+				};
+
+				partition@10000 {
+					label = "bootloader2";
+					reg = <0x10000 0x0>;
+					read-only;
+				};
+
+				soft_config {
+				};
+			};
+		};
+	};
+};
+
+&nand {
+	status = "okay";
+
+	nand-ecc-mode = "soft";
+	qca,nand-swap-dma;
+	qca,nand-scan-fixup;
+
+	partitions {
+		compatible = "fixed-partitions";
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		partition@0 {
+			label = "booter";
+			reg = <0x0000000 0x0040000>;
+			read-only;
+		};
+
+		partition@40000 {
+			label = "kernel";
+			reg = <0x0040000 0x03c0000>;
+		};
+
+		partition@400000 {
+			label = "ubi";
+			reg = <0x0400000 0x7c00000>;
+		};
+	};
+};
+
+&uart {
+	status = "okay";
+};
+
+&eth0 {
+	status = "okay";
+
+	phy-handle = <&swphy0>;
+
+	gmac-config {
+		device = <&gmac>;
+		switch-phy-swap = <1>;
+	};
+};
+
+&eth1 {
+	status = "okay";
+
+	compatible = "syscon", "simple-mfd";
+};
+
+&wmac {
+	status = "okay";
+
+	qca,no-eeprom;
+};