diff --git a/arch/arm/boot/dts/aspeed/Makefile b/arch/arm/boot/dts/aspeed/Makefile
index 23cbc7203a8e..61dbb908c74e 100644
--- a/arch/arm/boot/dts/aspeed/Makefile
+++ b/arch/arm/boot/dts/aspeed/Makefile
@@ -10,6 +10,7 @@ dtb-$(CONFIG_ARCH_ASPEED) += \
 	aspeed-bmc-arm-stardragon4800-rep2.dtb \
 	aspeed-bmc-asrock-e3c246d4i.dtb \
 	aspeed-bmc-asrock-romed8hm3.dtb \
+	aspeed-bmc-asrock-spc621d8hm3.dtb \
 	aspeed-bmc-bytedance-g220a.dtb \
 	aspeed-bmc-delta-ahe50dc.dtb \
 	aspeed-bmc-facebook-bletchley.dtb \
diff --git a/arch/arm/boot/dts/aspeed/aspeed-bmc-asrock-spc621d8hm3.dts b/arch/arm/boot/dts/aspeed/aspeed-bmc-asrock-spc621d8hm3.dts
new file mode 100644
index 000000000000..e77435fdb3b1
--- /dev/null
+++ b/arch/arm/boot/dts/aspeed/aspeed-bmc-asrock-spc621d8hm3.dts
@@ -0,0 +1,318 @@
+// SPDX-License-Identifier: GPL-2.0+
+/dts-v1/;
+
+#include "aspeed-g5.dtsi"
+#include <dt-bindings/gpio/aspeed-gpio.h>
+#include <dt-bindings/i2c/i2c.h>
+#include <dt-bindings/interrupt-controller/irq.h>
+
+/{
+	model = "ASRock SPC621D8HM3 BMC";
+	compatible = "asrock,spc621d8hm3-bmc", "aspeed,ast2500";
+
+	aliases {
+		serial4 = &uart5;
+
+		i2c20 = &i2c1mux0ch0;
+		i2c21 = &i2c1mux0ch1;
+	};
+
+	chosen {
+		stdout-path = &uart5;
+		bootargs = "console=tty0 console=ttyS4,115200 earlycon";
+	};
+
+	memory@80000000 {
+		reg = <0x80000000 0x20000000>;
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		heartbeat {
+			gpios = <&gpio ASPEED_GPIO(H, 6) GPIO_ACTIVE_LOW>;
+			linux,default-trigger = "timer";
+		};
+
+		system-fault {
+			gpios = <&gpio ASPEED_GPIO(Z, 2) GPIO_ACTIVE_LOW>;
+			panic-indicator;
+		};
+	};
+
+	iio-hwmon {
+		compatible = "iio-hwmon";
+		io-channels = <&adc 0>, <&adc 1>, <&adc 2>, <&adc 3>,
+			<&adc 4>, <&adc 5>, <&adc 6>, <&adc 7>,
+			<&adc 8>, <&adc 9>, <&adc 10>, <&adc 11>,
+			<&adc 12>, <&adc 13>, <&adc 14>, <&adc 15>;
+	};
+};
+
+&fmc {
+	status = "okay";
+	flash@0 {
+		status = "okay";
+		m25p,fast-read;
+		label = "bmc";
+		spi-max-frequency = <50000000>; /* 50 MHz */
+#include "openbmc-flash-layout-64.dtsi"
+	};
+};
+
+&uart5 {
+	status = "okay";
+};
+
+&vuart {
+	status = "okay";
+	aspeed,lpc-io-reg = <0x2f8>;
+	aspeed,lpc-interrupts = <3 IRQ_TYPE_LEVEL_HIGH>;
+};
+
+&mac0 {
+	status = "okay";
+
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_rgmii1_default &pinctrl_mdio1_default>;
+
+	nvmem-cells = <&eth0_macaddress>;
+	nvmem-cell-names = "mac-address";
+};
+
+&i2c0 {
+	status = "okay";
+};
+
+&i2c1 {
+	status = "okay";
+
+	/* hardware monitor/thermal sensor */
+	temperature-sensor@29 {
+		compatible = "nuvoton,nct7802";
+		reg = <0x29>;
+	};
+
+	/* motherboard temp sensor (TMP1, near BMC) */
+	temperature-sensor@4c {
+		compatible = "nuvoton,w83773g";
+		reg = <0x4c>;
+	};
+
+	/* motherboard FRU eeprom */
+	eeprom@50 {
+		compatible = "st,24c128", "atmel,24c128";
+		#address-cells = <1>;
+		#size-cells = <1>;
+		reg = <0x50>;
+		pagesize = <16>;
+
+		eth0_macaddress: macaddress@3f80 {
+			reg = <0x3f80 6>;
+		};
+	};
+
+	/* M.2 slot smbus mux */
+	i2c-mux@71 {
+		compatible = "nxp,pca9545";
+		reg = <0x71>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		i2c1mux0ch0: i2c@0 {
+			#address-cells = <1>;
+			#size-cells = <0>;
+			reg = <0>;
+		};
+
+		i2c1mux0ch1: i2c@1 {
+			#address-cells = <1>;
+			#size-cells = <0>;
+			reg = <1>;
+		};
+	};
+};
+
+&i2c2 {
+	status = "okay";
+};
+
+&i2c3 {
+	status = "okay";
+};
+
+&i2c4 {
+	status = "okay";
+};
+
+&i2c5 {
+	status = "okay";
+};
+
+&i2c6 {
+	status = "okay";
+};
+
+&i2c7 {
+	status = "okay";
+};
+
+&i2c8 {
+	status = "okay";
+};
+
+&i2c9 {
+	status = "okay";
+};
+
+&i2c10 {
+	status = "okay";
+};
+
+&i2c11 {
+	status = "okay";
+};
+
+&i2c12 {
+	status = "okay";
+};
+
+&i2c13 {
+	status = "okay";
+};
+
+&video {
+	status = "okay";
+};
+
+&vhub {
+	status = "okay";
+};
+
+&lpc_ctrl {
+	status = "okay";
+};
+
+&lpc_snoop {
+	status = "okay";
+	snoop-ports = <0x80>;
+};
+
+&kcs3 {
+	status = "okay";
+	aspeed,lpc-io-reg = <0xca2>;
+};
+
+&peci0 {
+	status = "okay";
+};
+
+&pwm_tacho {
+	status = "okay";
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_pwm0_default
+		&pinctrl_pwm2_default
+		&pinctrl_pwm3_default
+		&pinctrl_pwm4_default>;
+
+	fan@0 {
+		reg = <0x00>;
+		aspeed,fan-tach-ch = /bits/ 8 <0x00>;
+	};
+
+	fan@2 {
+		reg = <0x02>;
+		aspeed,fan-tach-ch = /bits/ 8 <0x02>;
+	};
+
+	fan@3 {
+		reg = <0x03>;
+		aspeed,fan-tach-ch = /bits/ 8 <0x03>;
+	};
+
+	fan@4 {
+		reg = <0x04>;
+		aspeed,fan-tach-ch = /bits/ 8 <0x04>;
+	};
+};
+
+&gpio {
+	status = "okay";
+	gpio-line-names =
+		/*  A */ "LOCATORLED_STATUS_N", "LOCATORBTN_N",
+			"BMC_READY_N", "FM_SPD_DDRCPU_LVLSHFT_EN",
+			"", "", "", "",
+		/*  B */ "NODE_ID_1", "NODE_ID_2", "PSU_FAN_FAIL_N", "",
+			"", "", "", "GPIO_RST",
+		/*  C */ "", "", "", "", "", "", "", "",
+		/*  D */ "FP_PWR_BTN_MUX_N", "FM_BMC_PWRBTN_OUT_N",
+			"FP_RST_BTN_N", "RST_BMC_RSTBTN_OUT_N",
+			"NMI_BTN_N", "BMC_NMI",
+			"", "",
+		/*  E */ "", "", "", "FM_ME_RCVR_N", "", "", "", "",
+		/*  F */ "BMC_SMB_SEL_N", "FM_CPU2_DISABLE_COD_N",
+			"FM_REMOTE_DEBUG_BMC_EN", "FM_CPU_ERR0_LVT3_EN",
+			"FM_CPU_ERR1_LVT3_EN", "FM_CPU_ERR2_LVT3_EN",
+			"FM_MEM_THERM_EVENT_CPU1_LVT3_N", "FM_MEM_THERM_EVENT_CPU2_LVT3_N",
+		/*  G */ "HWM_BAT_EN", "", "BMC_PHYRST_N", "FM_BIOS_SPI_BMC_CTRL",
+			"BMC_ALERT1_N", "BMC_ALERT2_N", "BMC_ALERT3_N", "IRQ_SML0_ALERT_N",
+		/*  H */ "BMC_SMB_PRESENT_1_N", "FM_PCH_CORE_VID_0", "FM_PCH_CORE_VID_1", "",
+			"FM_MFG_MODE", "BMC_RTCRST", "BMC_HB_LED_N", "BMC_CASEOPEN",
+		/*  I */ "IRQ_PVDDQ_ABCD_CPU1_VRHOT_LVC3_N", "IRQ_PVDDQ_ABCD_CPU2_VRHOT_LVC3_N",
+			"IRQ_PVDDQ_EFGH_CPU1_VRHOT_LVC3_N", "IRQ_PVDDQ_EFGH_CPU2_VRHOT_LVC3_N",
+			"", "", "", "",
+		/*  J */ "", "", "", "", "", "", "", "",
+		/*  K */ "", "", "", "", "", "", "", "",
+		/*  L */ "", "", "", "", "", "", "", "",
+		/*  M */ "FM_PVCCIN_CPU1_PWR_IN_ALERT_N", "FM_PVCCIN_CPU2_PWR_IN_ALERT_N",
+			"IRQ_PVCCIN_CPU1_VRHOT_LVC3_N", "IRQ_PVCCIN_CPU2_VRHOT_LVC3_N",
+			"FM_CPU1_PROCHOT_BMC_LVC3_N", "",
+			"FM_CPU1_MEMHOT_OUT_N", "FM_CPU2_MEMHOT_OUT_N",
+		/*  N */ "", "", "", "", "", "", "", "",
+		/*  O */ "", "", "", "", "", "", "", "",
+		/*  P */ "", "", "", "", "", "", "", "",
+		/*  Q */ "", "", "", "", "", "", "RST_GLB_RST_WARN_N", "PCIE_WAKE_N",
+		/*  R */ "", "", "FM_BMC_SUSACK_N", "FM_BMC_EUP_LOT6_N",
+			"", "FM_BMC_PCH_SCI_LPC_N", "", "",
+		/*  S */ "FM_DBP_PRESENT_N", "FM_CPU2_SKTOCC_LCT3_N",
+			"FM_CPU1_FIVR_FAULT_LVT3", "FM_CPU2_FIVR_FAULT_LVT3",
+			 "", "", "", "",
+		/*  T */ "", "", "", "", "", "", "", "",
+		/*  U */ "", "", "", "", "", "", "", "",
+		/*  V */ "", "", "", "", "", "", "", "",
+		/*  W */ "", "", "", "", "", "", "", "",
+		/*  X */ "", "", "", "", "", "", "", "",
+		/*  Y */ "FM_SLPS3_N", "FM_SLPS4_N", "", "FM_BMC_ONCTL_N_PLD",
+			"", "", "", "",
+		/*  Z */ "FM_CPU_MSMI_CATERR_LVT3_N", "", "SYSTEM_FAULT_LED_N", "BMC_THROTTLE_N",
+			"", "", "", "",
+		/* AA */ "FM_CPU1_THERMTRIP_LATCH_LVT3_N", "FM_CPU2_THERMTRIP_LATCH_LVT3_N",
+			"FM_BIOS_POST_COMPLT_N", "DBP_BMC_SYSPWROK",
+			"", "IRQ_SML0_ALERT_MUX_N",
+			"IRQ_SMI_ACTIVE_N", "IRQ_NMI_EVENT_N",
+		/* AB */ "FM_PCH_BMC_THERMTRIP_N", "PWRGD_SYS_PWROK",
+			"ME_OVERRIDE", "IRQ_BMC_PCH_SMI_LPC_N",
+			"", "", "", "",
+		/* AC */ "", "", "", "", "", "", "", "";
+};
+
+&adc {
+	status = "okay";
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_adc0_default /* 3VSB */
+		&pinctrl_adc1_default	   /* 5VSB */
+		&pinctrl_adc2_default	   /* CPU1 */
+		&pinctrl_adc3_default	   /* NC */
+		&pinctrl_adc4_default	   /* VCCMABCD */
+		&pinctrl_adc5_default	   /* VCCMEFGH */
+		&pinctrl_adc6_default	   /* NC */
+		&pinctrl_adc7_default	   /* NC */
+		&pinctrl_adc8_default	   /* PVNN_PCH */
+		&pinctrl_adc9_default	   /* 1P05PCH */
+		&pinctrl_adc10_default	   /* 1P8PCH */
+		&pinctrl_adc11_default	   /* BAT */
+		&pinctrl_adc12_default	   /* 3V */
+		&pinctrl_adc13_default	   /* 5V */
+		&pinctrl_adc14_default	   /* 12V */
+		&pinctrl_adc15_default>;   /* GND */
+};
