arm64: dts: cix: Add OrangePi 6 Plus board support

OrangePi 6 Plus adopts CIX CD8180/CD8160 SoC, built-in 12-core 64-bit
processor + NPU processor,integrated graphics processor, equipped with
16GB/32GB/64GB LPDDR5, and provides two M.2 KEY-M interfaces 2280 for NVMe
SSD,as well as SPI FLASH and TF slots to meet the needs of fast read/write
and high-capacity storage

Signed-off-by: Gary Yang <gary.yang@cixtech.com>
Link: https://lore.kernel.org/r/20260110093406.2700505-3-gary.yang@cixtech.com
Signed-off-by: Peter Chen <peter.chen@cixtech.com>

Author: Gary Yang

arch/arm64/boot/dts/cix/Makefile

@@ -1,2 +1,3 @@
 # SPDX-License-Identifier: GPL-2.0
 dtb-$(CONFIG_ARCH_CIX) += sky1-orion-o6.dtb
+dtb-$(CONFIG_ARCH_CIX) += sky1-xcp.dtb

arch/arm64/boot/dts/cix/sky1-xcp.dts

@@ -0,0 +1,83 @@
+// SPDX-License-Identifier: BSD-3-Clause
+/*
+ * Copyright 2025 Cix Technology Group Co., Ltd.
+ *
+ */
+
+/dts-v1/;
+
+#include "sky1.dtsi"
+#include "sky1-pinfunc.h"
+
+/ {
+	model = "Xunlong,OrangePi 6 Plus";
+	compatible = "xunlong,orangepi-6-plus", "cix,sky1";
+
+	aliases {
+		serial2 = &uart2;
+	};
+
+	chosen {
+		stdout-path = &uart2;
+	};
+
+	reserved-memory {
+		#address-cells = <2>;
+		#size-cells = <2>;
+		ranges;
+
+		linux,cma {
+			compatible = "shared-dma-pool";
+			reusable;
+			size = <0x0 0x28000000>;
+			linux,cma-default;
+		};
+	};
+
+};
+
+&iomuxc {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_hog>;
+
+	pinctrl_hog: hog-cfg {
+		pins {
+			pinmux = <CIX_PAD_GPIO144_FUNC_GPIO144>,
+				<CIX_PAD_GPIO145_FUNC_GPIO145>,
+				<CIX_PAD_GPIO146_FUNC_GPIO146>,
+				<CIX_PAD_GPIO147_FUNC_GPIO147>;
+			bias-pull-down;
+			drive-strength = <8>;
+		};
+	};
+};
+
+&iomuxc_s5 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_hog_s5>;
+
+	pinctrl_hog_s5: hog-s5-cfg {
+		pins {
+			pinmux = <CIX_PAD_GPIO014_FUNC_GPIO014>;
+			bias-pull-up;
+			drive-strength = <8>;
+
+		};
+	};
+};
+
+&pcie_x8_rc {
+	status = "okay";
+};
+
+&pcie_x2_rc {
+	status = "okay";
+};
+
+&pcie_x1_1_rc {
+	status = "okay";
+};
+
+&uart2 {
+	status = "okay";
+};