diff --git a/arch/arm64/boot/dts/exynos/exynos990.dtsi b/arch/arm64/boot/dts/exynos/exynos990.dtsi
new file mode 100644
index 000000000000..16fda5fe8163
--- /dev/null
+++ b/arch/arm64/boot/dts/exynos/exynos990.dtsi
@@ -0,0 +1,194 @@
+// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
+/*
+ * Samsung Exynos 990 SoC device tree source
+ *
+ * Copyright (c) 2024, Igor Belwon <igor.belwon@mentallysanemainliners.org>
+ */
+
+#include <dt-bindings/interrupt-controller/arm-gic.h>
+
+/ {
+	compatible = "samsung,exynos990";
+	#address-cells = <2>;
+	#size-cells = <1>;
+
+	interrupt-parent = <&gic>;
+
+	arm-a55-pmu {
+		compatible = "arm,cortex-a55-pmu";
+		interrupts = <GIC_SPI 163 IRQ_TYPE_LEVEL_HIGH>,
+			     <GIC_SPI 164 IRQ_TYPE_LEVEL_HIGH>,
+			     <GIC_SPI 165 IRQ_TYPE_LEVEL_HIGH>,
+			     <GIC_SPI 166 IRQ_TYPE_LEVEL_HIGH>;
+
+		interrupt-affinity = <&cpu0>,
+				     <&cpu1>,
+				     <&cpu2>,
+				     <&cpu3>;
+	};
+
+	arm-a76-pmu {
+		compatible = "arm,cortex-a76-pmu";
+		interrupts = <GIC_SPI 167 IRQ_TYPE_LEVEL_HIGH>,
+			     <GIC_SPI 168 IRQ_TYPE_LEVEL_HIGH>;
+
+		interrupt-affinity = <&cpu4>,
+				     <&cpu5>;
+	};
+
+	/* There's no PMU model for cluster2, which are the Mongoose cores. */
+
+	cpus {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		cpu-map {
+			cluster0 {
+				core0 {
+					cpu = <&cpu0>;
+				};
+
+				core1 {
+					cpu = <&cpu1>;
+				};
+
+				core2 {
+					cpu = <&cpu2>;
+				};
+
+				core3 {
+					cpu = <&cpu3>;
+				};
+			};
+
+			cluster1 {
+				core0 {
+					cpu = <&cpu4>;
+				};
+
+				core1 {
+					cpu = <&cpu5>;
+				};
+			};
+
+			cluster2 {
+				core0 {
+					cpu = <&cpu6>;
+				};
+
+				core1 {
+					cpu = <&cpu7>;
+				};
+			};
+		};
+
+		cpu0: cpu@0 {
+			device_type = "cpu";
+			compatible = "arm,cortex-a55";
+			reg = <0x0>;
+			enable-method = "psci";
+		};
+
+		cpu1: cpu@1 {
+			device_type = "cpu";
+			compatible = "arm,cortex-a55";
+			reg = <0x1>;
+			enable-method = "psci";
+		};
+
+		cpu2: cpu@2 {
+			device_type = "cpu";
+			compatible = "arm,cortex-a55";
+			reg = <0x2>;
+			enable-method = "psci";
+		};
+
+		cpu3: cpu@3 {
+			device_type = "cpu";
+			compatible = "arm,cortex-a55";
+			reg = <0x3>;
+			enable-method = "psci";
+		};
+
+		cpu4: cpu@100 {
+			device_type = "cpu";
+			compatible = "arm,cortex-a76";
+			reg = <0x4>;
+			enable-method = "psci";
+		};
+
+		cpu5: cpu@101 {
+			device_type = "cpu";
+			compatible = "arm,cortex-a76";
+			reg = <0x5>;
+			enable-method = "psci";
+		};
+
+		cpu6: cpu@200 {
+			device_type = "cpu";
+			compatible = "samsung,mongoose-m5";
+			reg = <0x6>;
+			enable-method = "psci";
+		};
+
+		cpu7: cpu@201 {
+			device_type = "cpu";
+			compatible = "samsung,mongoose-m5";
+			reg = <0x7>;
+			enable-method = "psci";
+		};
+	};
+
+	oscclk: clock-osc {
+		compatible = "fixed-clock";
+		#clock-cells = <0>;
+		clock-output-names = "oscclk";
+	};
+
+	psci {
+		compatible = "arm,psci-0.2";
+		method = "hvc";
+	};
+
+	soc: soc@0 {
+		compatible = "simple-bus";
+		ranges = <0x0 0x0 0x0 0x20000000>;
+
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		chipid@10000000 {
+			compatible = "samsung,exynos990-chipid",
+				     "samsung,exynos850-chipid";
+			reg = <0x10000000 0x100>;
+		};
+
+		gic: interrupt-controller@10101000 {
+			compatible = "arm,gic-400";
+			reg = <0x10101000 0x1000>,
+			      <0x10102000 0x1000>,
+			      <0x10104000 0x2000>,
+			      <0x10106000 0x2000>;
+			#interrupt-cells = <3>;
+			interrupt-controller;
+			interrupts = <GIC_PPI 9 (GIC_CPU_MASK_SIMPLE(8) |
+						 IRQ_TYPE_LEVEL_HIGH)>;
+			#address-cells = <0>;
+			#size-cells = <1>;
+		};
+	};
+
+	timer {
+		compatible = "arm,armv8-timer";
+		interrupts = <GIC_PPI 13 (GIC_CPU_MASK_SIMPLE(8) | IRQ_TYPE_LEVEL_LOW)>,
+			     <GIC_PPI 14 (GIC_CPU_MASK_SIMPLE(8) | IRQ_TYPE_LEVEL_LOW)>,
+			     <GIC_PPI 11 (GIC_CPU_MASK_SIMPLE(8) | IRQ_TYPE_LEVEL_LOW)>,
+			     <GIC_PPI 10 (GIC_CPU_MASK_SIMPLE(8) | IRQ_TYPE_LEVEL_LOW)>;
+
+		/*
+		 * Non-updatable, broken stock Samsung bootloader does not
+		 * configure CNTFRQ_EL0
+		 */
+		clock-frequency = <26000000>;
+	};
+};
