Add Board: Radxa Rock-4D (#391)

* Add Board: Radxa Rock-4D

* Add Rock-4D SPI variant

* Fix Rock4D Makefile typo

* RK3576: Rock-4D delete bootargs in devicetree

Author: HeyMeco

arch/arm64/boot/dts/rockchip/Makefile

@@ -308,6 +308,8 @@ dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3576-iotest-v10.dtb
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3576-iotest-v10-edp2dp.dtb
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3576-iotest-v10-linux.dtb
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3576-nvr-v10.dtb
+dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3576-rock-4d.dtb
+dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3576-rock-4d-spi.dtb
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3576-tablet-v10.dtb
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3576-tablet-v11.dtb
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3576-test1-v10.dtb

arch/arm64/boot/dts/rockchip/rk3576-rock-4d-spi.dts

@@ -0,0 +1,50 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Copyright (c) 2025 Rockchip Electronics Co., Ltd.
+ * Copyright (c) 2025 Radxa Computer (Shenzhen) Co., Ltd.
+ *
+ */
+
+/dts-v1/;
+
+#include "rk3576-rock-4d.dts"
+
+/ {
+	model = "Radxa ROCK 4D SPI";
+	compatible = "radxa,rock-4d-spi", "radxa,rock-4d", "rockchip,rk3576";
+};
+
+&sfc0 {
+	status = "okay";
+	max-freq = <50000000>;
+	#address-cells = <1>;
+	#size-cells = <0>;
+	pinctrl-names = "default";
+	pinctrl-0 = <&fspi0_pins>;
+
+	spi_flash: spi-flash@0 {
+		#address-cells = <1>;
+		#size-cells = <0>;
+		compatible = "jedec,spi-nor";
+		reg = <0x0>;
+		spi-max-frequency = <50000000>;
+		spi-tx-bus-width = <1>;
+		spi-rx-bus-width = <4>;
+		status = "okay";
+
+		partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			loader@0 {
+				label = "loader";
+				reg = <0x0 0x1000000>;
+			};
+		};
+	};
+};
+
+&sdhci {
+	status = "disabled";
+};