ath79: add support for MikroTik RouterBOARD LHG 2nD

The MikroTik RouterBOARD LHG 2nD (sold as LHG 2) is a 2.4 GHz
802.11b/g/n outdoor device with a feed and an integrated dual
polarization grid dish antenna based on the LHG-HB platform.

See https://mikrotik.com/product/lhg_2 for more info.

Specifications:
 - SoC: Qualcomm Atheros QCA9533
 - RAM: 64 MB
 - Storage: 16 MB NOR
 - Wireless: Atheros AR9531 (SoC) 802.11b/g/n 2x2:2, 18 dBi antenna
 - Ethernet: Atheros AR8229 (SoC), 1x 10/100 port, 12-28 Vdc PoE in
 - 8 user-controllable LEDs:
   · 1x power (blue)
   · 1x user (green)
   · 1x lan (green)
   · 1x wlan (green)
   · 4x rssi (green)

Note:
 The rssihigh LED is disabled, as it shares GPIO 16 with the reset
 button.

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

Signed-off-by: Roger Pueyo Centelles <roger.pueyo@guifi.net>
[rebase, remove rssiled setup, adjust commit message, add DTSIs]
Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>

3 files changed, 184 insertions, 0 deletions

diff --git a/target/linux/ath79/dts/qca9533_mikrotik_routerboard-16m.dtsi b/target/linux/ath79/dts/qca9533_mikrotik_routerboard-16m.dtsi
new file mode 100644
index 0000000000..8af8601da2
--- /dev/null
+++ b/target/linux/ath79/dts/qca9533_mikrotik_routerboard-16m.dtsi
@@ -0,0 +1,87 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+
+#include "qca953x.dtsi"
+
+/ {
+	keys {
+		compatible = "gpio-keys";
+
+		reset {
+			label = "reset";
+			linux,code = <KEY_RESTART>;
+			gpios = <&gpio 16 GPIO_ACTIVE_LOW>;
+			debounce-interval = <60>;
+		};
+	};
+};
+
+&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 {
+					label = "soft_config";
+				};
+			};
+
+			partition@20000 {
+				compatible = "mikrotik,minor";
+				label = "firmware";
+				reg = <0x020000 0xfe0000>;
+			};
+		};
+	};
+};
+
+&uart {
+	status = "okay";
+};
+
+&wmac {
+	status = "okay";
+
+	qca,no-eeprom;
+};
diff --git a/target/linux/ath79/dts/qca9533_mikrotik_routerboard-lhg-2nd.dts b/target/linux/ath79/dts/qca9533_mikrotik_routerboard-lhg-2nd.dts
new file mode 100644
index 0000000000..024ddd980f
--- /dev/null
+++ b/target/linux/ath79/dts/qca9533_mikrotik_routerboard-lhg-2nd.dts
@@ -0,0 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+/dts-v1/;
+
+#include "qca9533_mikrotik_routerboard-lhg-hb.dtsi"
+
+/ {
+	compatible = "mikrotik,routerboard-lhg-2nd", "qca,qca9533";
+	model = "MikroTik RouterBOARD LHG 2nD";
+};
diff --git a/target/linux/ath79/dts/qca9533_mikrotik_routerboard-lhg-hb.dtsi b/target/linux/ath79/dts/qca9533_mikrotik_routerboard-lhg-hb.dtsi
new file mode 100644
index 0000000000..32cc6d3731
--- /dev/null
+++ b/target/linux/ath79/dts/qca9533_mikrotik_routerboard-lhg-hb.dtsi
@@ -0,0 +1,88 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+
+#include "qca9533_mikrotik_routerboard-16m.dtsi"
+
+/ {
+	compatible = "mikrotik,routerboard-lhg-hb", "qca,qca9533";
+	model = "MikroTik RouterBOARD LHG-HB platform";
+
+	aliases {
+		led-boot = &led_user;
+		led-failsafe = &led_user;
+		led-upgrade = &led_user;
+		led-running = &led_user;
+		serial0 = &uart;
+	};
+
+	leds {
+		compatible = "gpio-leds";
+		pinctrl-names = "default";
+		pinctrl-0 = <&led_wan_pin>;
+
+		power {
+			label = "mikrotik:blue:power";
+			gpios = <&gpio 17 GPIO_ACTIVE_HIGH>;
+			default-state = "on";
+		};
+
+		led_user: user {
+			label = "mikrotik:green:user";
+			gpios = <&gpio 14 GPIO_ACTIVE_LOW>;
+		};
+
+		lan {
+			label = "mikrotik:green:lan";
+			gpios = <&gpio 4 GPIO_ACTIVE_LOW>;
+		};
+
+		wlan {
+			label = "mikrotik:green:wlan";
+			gpios = <&gpio 11 GPIO_ACTIVE_LOW>;
+			linux,default-trigger = "phy0tpt";
+		};
+
+		rssilow {
+			label = "mikrotik:green:rssilow";
+			gpios = <&gpio 9 GPIO_ACTIVE_LOW>;
+		};
+
+		rssimediumlow {
+			label = "mikrotik:green:rssimediumlow";
+			gpios = <&gpio 12 GPIO_ACTIVE_LOW>;
+		};
+
+		rssimediumhigh {
+			label = "mikrotik:green:rssimediumhigh";
+			gpios = <&gpio 13 GPIO_ACTIVE_LOW>;
+		};
+
+		/* The rssihigh LED GPIO 16 is shared with the reset button, so it remains
+		unregistered here to avoid conflict.
+
+		rssihigh {
+			label = "mikrotik:green:rssihigh";
+			gpios = <&gpio 16 GPIO_ACTIVE_LOW>;
+		};
+		*/
+	};
+};
+
+&eth0 {
+	compatible = "syscon", "simple-mfd";
+};
+
+&eth1 {
+	status = "okay";
+
+	phy-handle = <&swphy0>;
+
+	gmac-config {
+		device = <&gmac>;
+	};
+};
+
+&pinmux {
+	led_wan_pin: pinmux_led_wan_pin {
+		pinctrl-single,bits = <0x4 0x0 0xff>;
+	};
+};