NanoPC-T6 LTS Plus: add U-Boot device tree and defconfig patch

Add upstream DTS, u-boot auto DT selection, u-boot dtsi

Author: igorpecovnik

config/boards/nanopct6-lts-plus.conf

@@ -0,0 +1,42 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Igor Pecovnik <igor@armbian.com>
+Date: Sun, 06 Apr 2026 12:00:00 +0200
+Subject: board: friendlyelec: add NanoPC-T6 LTS Plus support
+
+Add NanoPC-T6 LTS Plus variant to the ADC-based board detection table.
+The LTS Plus reads ~3076 on ADC channel 5, compared to T6 (348-528)
+and T6 LTS (1957-2137). Set board_name so the correct model is
+displayed during boot.
+
+Signed-off-by: Igor Pecovnik <igor@armbian.com>
+---
+--- a/board/friendlyelec/nanopc-t6-rk3588/nanopc-t6-rk3588.c
++++ b/board/friendlyelec/nanopc-t6-rk3588/nanopc-t6-rk3588.c
+@@ -11,11 +11,13 @@
+ 	unsigned int low;
+ 	unsigned int high;
+ 	const char *fdtfile;
++	const char *board_name;
+ };
+ 
+ static const struct board_model board_models[] = {
+-	{  348,  528, "rockchip/rk3588-nanopc-t6.dtb" },
+-	{ 1957, 2137, "rockchip/rk3588-nanopc-t6-lts.dtb" },
++	{  348,  528, "rockchip/rk3588-nanopc-t6.dtb", "NanoPC-T6" },
++	{ 1957, 2137, "rockchip/rk3588-nanopc-t6-lts.dtb", "NanoPC-T6 LTS" },
++	{ 2986, 3166, "rockchip/rk3588-nanopc-t6-lts-plus.dtb", "NanoPC-T6 LTS Plus" },
+ };
+ 
+ static const struct board_model *get_board_model(void)
+@@ -42,8 +44,10 @@
+ {
+ 	const struct board_model *model = get_board_model();
+ 
+-	if (model)
++	if (model) {
+ 		env_set("fdtfile", model->fdtfile);
++		env_set("board_name", model->board_name);
++	}
+ 
+ 	return 0;
+ }

patch/u-boot/v2026.01/add-nanopc-t6-lts-plus-detection.patch

@@ -0,0 +1,3 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+
+#include "rk3588-nanopc-t6-u-boot.dtsi"

patch/u-boot/v2026.01/board_nanopct6-lts-plus/add-nanopc-t6-lts-plus-detection.patch

@@ -0,0 +1,62 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Copyright (c) 2021 Rockchip Electronics Co., Ltd.
+ * Copyright (c) 2023 Thomas McKahan
+ * Copyright (c) 2024 Linaro Ltd.
+ * Copyright (c) 2025 FriendlyElec Computer Tech. Co., Ltd.
+ * Copyright (c) 2025 Armbian <igor@armbian.com>
+ *
+ */
+
+/dts-v1/;
+
+#include "rk3588-nanopc-t6.dtsi"
+
+/ {
+	model = "FriendlyElec NanoPC-T6 LTS Plus";
+	compatible = "friendlyarm,nanopc-t6-lts-plus", "rockchip,rk3588";
+
+	/* provide power for on-board USB 2.0 hub */
+	vcc5v0_usb20_host: regulator-vcc5v0-usb20-host {
+		compatible = "regulator-fixed";
+		enable-active-high;
+		gpio = <&gpio1 RK_PA4 GPIO_ACTIVE_HIGH>;
+		pinctrl-0 = <&usb20_host_pwren>;
+		pinctrl-names = "default";
+		regulator-always-on;
+		regulator-boot-on;
+		regulator-max-microvolt = <5000000>;
+		regulator-min-microvolt = <5000000>;
+		regulator-name = "vcc5v0_usb20_host";
+		vin-supply = <&vcc5v0_sys>;
+	};
+};
+
+&pinctrl {
+	usb {
+		usb20_host_pwren: usb20-host-pwren {
+			rockchip,pins = <1 RK_PA4 RK_FUNC_GPIO &pcfg_pull_none>;
+		};
+	};
+};
+
+&u2phy1 {
+	status = "okay";
+};
+
+&u2phy1_otg {
+	status = "okay";
+};
+
+&u2phy3_host {
+	phy-supply = <&vcc5v0_usb20_host>;
+};
+
+&usbdp_phy1 {
+	status = "okay";
+};
+
+&usb_host1_xhci {
+	dr_mode = "host";
+	status = "okay";
+};