ramips: add support for Mikrotik LtAP-2HnD

Mikrotik LtAP-2HnD is a outdoor/automotive WLAN 4 router with integrated GPS
receiver and two mPCIe slots.

Specifications:
* SoC: MT7621A
* RAM: 128 MiB Nanya NT5CC64M16GP-DI
* Flash: 16 MiB winbond W25Q128JV
* WLAN:
  * Atheros AR9382 with power amplifier SKY 85330 (2x2 internal antennas,
    with RF switches for external connectors)
* Ethernet: 1 Gbps, single port
* USB Host: USB 2.0 Speeds
* Serial: 115200 baud
* LEDs: Power, System, GPS, 5* RSSI
*  mPCIe:
   * miniPCIe slot 1: PCIe and USB 2.0 Host (via switch shared with USB Host)
   * miniPCIe slot 2: USB 2.0 and 3.0
* SIM Cards:
  * Slot 1 Connected to mPCIe slot 1
  * Slot 2 and 3 connected to mPCIe slot 2 via switch
* GPS: MTK 3333 on serial port 2 (/dev/ttyS1), 115200 baud and PPS on gpio 14

gpios are exposed to /sys/class/gpio:

* usb-select: swithes USB 2.0 interface between external port and internal
mPCIe slot 1 default is the external USB interface
* gps-reset: resets the GPS interface chip
* sim-select: switches between sim slot 2 and 3 connected to mPCIe slot 2
* gps-ant-select: switches GPS antenna between internal antenna and SMA
connected antenna
* lte-reset: resets mPCIe slot 2

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

Signed-off-by: Arne Zachlod <arne@nerdkeller.org>

1 files changed, 171 insertions, 0 deletions

diff --git a/target/linux/ramips/dts/mt7621_mikrotik_ltap-2hnd.dts b/target/linux/ramips/dts/mt7621_mikrotik_ltap-2hnd.dts
new file mode 100644
index 0000000000..feeda9685e
--- /dev/null
+++ b/target/linux/ramips/dts/mt7621_mikrotik_ltap-2hnd.dts
@@ -0,0 +1,171 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+
+#include "mt7621_mikrotik.dtsi"
+
+/ {
+	compatible = "mikrotik,ltap-2hnd", "mediatek,mt7621-soc";
+	model = "MikroTik RouterBOARD LtAP-2HnD";
+
+	aliases {
+		led-boot = &led_usr;
+		led-failsafe = &led_usr;
+		led-running = &led_usr;
+		led-upgrade = &led_usr;
+	};
+
+	ath9k-leds {
+		compatible = "gpio-leds";
+
+		rssi0 {
+			label = "green:rssi0";
+			gpios = <&ath9k 0 GPIO_ACTIVE_LOW>;
+		};
+		rssi1 {
+			label = "green:rssi1";
+			gpios = <&ath9k 1 GPIO_ACTIVE_LOW>;
+		};
+		rssi2 {
+			label = "green:rssi2";
+			gpios = <&ath9k 2 GPIO_ACTIVE_LOW>;
+		};
+		rssi3 {
+			label = "green:rssi3";
+			gpios = <&ath9k 3 GPIO_ACTIVE_LOW>;
+		};
+		rssi4 {
+			label = "green:rssi4";
+			gpios = <&ath9k 4 GPIO_ACTIVE_LOW>;
+		};
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		pwr {
+			label = "blue:pwr";
+			gpios = <&gpio 23 GPIO_ACTIVE_HIGH>;
+			default-state = "on";
+		};
+
+		led_usr: usr {
+			label = "green:usr";
+			gpios = <&gpio 0 GPIO_ACTIVE_HIGH>;
+		};
+
+		gps {
+			label = "green:gps";
+			gpios = <&gpio 28 GPIO_ACTIVE_LOW>;
+		};
+	};
+
+	/* TODO: find GPIOs for the WLAN antenna switches */
+	gpio-export {
+		compatible = "gpio-export";
+
+		usb-select {
+			gpio-export,name = "usb-select";
+			gpio-export,output = <1>;
+			gpios = <&gpio 12 GPIO_ACTIVE_HIGH>;
+		};
+		gps-reset {
+			gpio-export,name = "gps-reset";
+			gpio-export,output = <1>;
+			gpios = <&gpio 13 GPIO_ACTIVE_LOW>;
+		};
+		sim-select {
+			gpio-export,name = "sim-select";
+			gpio-export,output = <1>;
+			gpios = <&gpio 25 GPIO_ACTIVE_HIGH>;
+		};
+		gps-ant-select {
+			/* internal antenna = 0 */
+			gpio-export,name = "gps-ant-select";
+			gpio-export,output = <0>;
+			gpios = <&gpio 27 GPIO_ACTIVE_HIGH>;
+		};
+		lte-reset {
+			gpio-export,name = "lte-reset";
+			gpio-export,output = <1>;
+			gpios = <&gpio 29 GPIO_ACTIVE_HIGH>;
+		};
+	};
+
+	pps {
+		compatible = "pps-gpio";
+		gpios = <&gpio 14 GPIO_ACTIVE_HIGH>;
+	};
+
+	pcie1_vcc_reg {
+		compatible = "regulator-fixed";
+		regulator-name = "pcie1_vcc";
+
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		gpio = <&gpio 10 GPIO_ACTIVE_HIGH>;
+		enable-active-high;
+		regulator-boot-on;
+	};
+
+	pcie2_vcc_reg {
+		compatible = "regulator-fixed";
+		regulator-name = "pcie2_vcc";
+
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		gpio = <&gpio 11 GPIO_ACTIVE_HIGH>;
+		enable-active-high;
+		regulator-boot-on;
+	};
+};
+
+&partitions {
+	partition@40000 {
+		compatible = "mikrotik,minor";
+		label = "firmware";
+		reg = <0x040000 0xfc0000>;
+	};
+};
+
+&ethernet {
+	pinctrl-0 = <&mdio_pins>, <&rgmii1_pins>;
+};
+
+&switch0 {
+	ports {
+		port@0 {
+			status = "okay";
+			label = "lan";
+		};
+	};
+};
+
+&pcie0 {
+	status = "okay";
+
+	ath9k: wifi@0,0 {
+		compatible = "pci168c,0030";
+		reg = <0x0000 0 0 0 0>;
+		qca,no-eeprom;
+		gpio-controller;
+		#gpio-cells = <2>;
+	};
+};
+
+&state_default {
+	gpio {
+		groups = "uart2", "wdt", "rgmii2";
+		function = "gpio";
+	};
+};
+
+&i2c {
+	status = "okay";
+};
+
+&pcie {
+	status = "okay";
+};
+
+&uartlite3 {
+	status = "okay";
+};