[PATCH 24/25] riscv: add Metanoia MT2824 SoC and MT5824 EVB support

["Benoît Monin" <benoit.monin@bootlin.com>]

Add the device tree for the Metanoia MT2824, a dual-core Andes
AX45MP-based SoC, and for the MT5824 evaluation board.

The SoC device tree describes the CPUs and their L2 cache, the PLIC,
PLICSW and PLMT, the reset controller, the reboot controller, the
watchdog, two UARTs, the QSPI and eight SPI controllers, the DWC
MSHC MMC controller, and the USB2 controller.

The MT5824 EVB enables the watchdog, the two UARTs, the MMC
controller, the QSPI port with its SPI-NOR flash, the first three SPI
controllers, and the USB controller.

Originally-by: Jun Chang <jun.chang@metanoia-comm.com>
Signed-off-by: Benoît Monin <benoit.monin@bootlin.com>
---
 arch/riscv/boot/dts/Makefile                |   1 +
 arch/riscv/boot/dts/metanoia/Makefile       |   2 +
 arch/riscv/boot/dts/metanoia/mt2824.dtsi    | 330 ++++++++++++++++++++++++++++
 arch/riscv/boot/dts/metanoia/mt5824-evb.dts |  81 +++++++
 4 files changed, 414 insertions(+)

diff --git a/arch/riscv/boot/dts/Makefile b/arch/riscv/boot/dts/Makefile
index 69d8751fb17c..8e1e987ea089 100644
--- a/arch/riscv/boot/dts/Makefile
+++ b/arch/riscv/boot/dts/Makefile
@@ -4,6 +4,7 @@ subdir-y += andes
 subdir-y += anlogic
 subdir-y += canaan
 subdir-y += eswin
+subdir-y += metanoia
 subdir-y += microchip
 subdir-y += renesas
 subdir-y += sifive
diff --git a/arch/riscv/boot/dts/metanoia/Makefile b/arch/riscv/boot/dts/metanoia/Makefile
new file mode 100644
index 000000000000..7a685798d5a4
--- /dev/null
+++ b/arch/riscv/boot/dts/metanoia/Makefile
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0
+dtb-$(CONFIG_ARCH_METANOIA) += mt5824-evb.dtb
diff --git a/arch/riscv/boot/dts/metanoia/mt2824.dtsi b/arch/riscv/boot/dts/metanoia/mt2824.dtsi
new file mode 100644
index 000000000000..5f73c6d3760b
--- /dev/null
+++ b/arch/riscv/boot/dts/metanoia/mt2824.dtsi
@@ -0,0 +1,330 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Copyright (C) 2026 Metanoia Communications Inc.. All rights reserved.
+ */
+
+#include <dt-bindings/interrupt-controller/irq.h>
+
+/ {
+	#address-cells = <0x02>;
+	#size-cells = <0x02>;
+	compatible = "metanoia,mt2824";
+
+	cpus: cpus {
+		#address-cells = <0x01>;
+		#size-cells = <0x00>;
+		timebase-frequency = <20000000>;
+
+		cpu0: cpu@0 {
+			device_type = "cpu";
+			reg = <0x00>;
+			compatible = "andestech,ax45mp", "riscv";
+			riscv,isa-base = "rv64i";
+			riscv,isa-extensions = "i", "m", "a", "f", "d", "c",
+					       "zicntr", "zicsr", "zifencei",
+					       "zihpm", "xandespmu";
+			mmu-type = "riscv,sv39";
+			clock-frequency = <900000000>;
+			i-cache-size = <0x8000>;
+			i-cache-sets = <0x100>;
+			i-cache-line-size = <0x40>;
+			i-cache-block-size = <0x40>;
+			d-cache-size = <0x8000>;
+			d-cache-sets = <0x80>;
+			d-cache-line-size = <0x40>;
+			d-cache-block-size = <0x40>;
+			next-level-cache = <&l2_cache>;
+
+			cpu0intc: interrupt-controller {
+				#interrupt-cells = <0x01>;
+				interrupt-controller;
+				compatible = "andestech,cpu-intc", "riscv,cpu-intc";
+			};
+		};
+
+		cpu1: cpu@1 {
+			device_type = "cpu";
+			reg = <0x01>;
+			compatible = "andestech,ax45mp", "riscv";
+			riscv,isa-base = "rv64i";
+			riscv,isa-extensions = "i", "m", "a", "f", "d", "c",
+					       "zicntr", "zicsr", "zifencei",
+					       "zihpm", "xandespmu";
+			mmu-type = "riscv,sv39";
+			clock-frequency = <900000000>;
+			i-cache-size = <0x8000>;
+			i-cache-sets = <0x100>;
+			i-cache-line-size = <0x40>;
+			i-cache-block-size = <0x40>;
+			d-cache-size = <0x8000>;
+			d-cache-sets = <0x80>;
+			d-cache-line-size = <0x40>;
+			d-cache-block-size = <0x40>;
+			next-level-cache = <&l2_cache>;
+
+			cpu1intc: interrupt-controller {
+				#interrupt-cells = <0x01>;
+				interrupt-controller;
+				compatible = "andestech,cpu-intc", "riscv,cpu-intc";
+			};
+		};
+	};
+
+	clocks {
+		ext_clk: ext-clk {
+			compatible = "fixed-clock";
+			#clock-cells = <0>;
+			clock-frequency = <20000000>;
+			clock-output-names = "ext-clk";
+		};
+
+		pclk_div4: platform-clock-div4 {
+			compatible = "fixed-clock";
+			#clock-cells = <0>;
+			clock-frequency = <225000000>;
+			clock-output-names = "platform-clock-div4";
+		};
+
+		pll_soc_out3: pll-soc-out3 {
+			compatible = "fixed-clock";
+			#clock-cells = <0>;
+			clock-frequency = <180000000>;
+			clock-output-names = "pll-soc-out3";
+		};
+
+		usb_otg_ahb_clk: clock-usb-otg-ahb {
+			compatible = "fixed-clock";
+			#clock-cells = <0>;
+			clock-frequency = <60000000>;
+			clock-output-names = "otg";
+		};
+	};
+
+	soc: soc {
+		#address-cells = <0x02>;
+		#size-cells = <0x02>;
+		compatible = "simple-bus";
+		interrupt-parent = <&plic>;
+		ranges;
+
+		usb0: usb@4000000 {
+			compatible = "metanoia,mt2824-usb", "snps,dwc2";
+			reg = <0x0 0x04000000 0x0 0x100000>;
+			interrupts = <7 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&usb_otg_ahb_clk>;
+			clock-names = "otg";
+			dr_mode = "host";
+			resets = <&rst 19>, <&rst 20>;
+			reset-names = "dwc2", "dwc2-ecc";
+			phys = <&usb2phy>;
+			phy-names = "usb2-phy";
+			hnp-disable;
+			srp-disable;
+			disable-over-current;
+			status = "disabled";
+		};
+
+		mmcsd: mmc@4100000 {
+			compatible = "metanoia,mt2824-dwcmshc";
+			clocks = <&pll_soc_out3>;
+			clock-names = "core";
+			reg = <0x0 0x04100000 0x0 0x00100000>;
+			interrupts = <5 IRQ_TYPE_LEVEL_HIGH>;
+			status = "disabled";
+		};
+
+		l2_cache: cache-controller@a000000 {
+			compatible = "metanoia,mt2824-ax45mp-cache",
+				     "andestech,ax45mp-cache", "cache";
+			reg = <0x0 0x0a000000 0x0 0x40000>;
+			interrupts = <1 IRQ_TYPE_LEVEL_HIGH>;
+			cache-line-size = <64>;
+			cache-level = <2>;
+			cache-sets = <1024>;
+			cache-size = <0x40000>;
+			cache-unified;
+		};
+
+		plic: interrupt-controller@c000000 {
+			compatible = "metanoia,mt2824-plic", "andestech,nceplic100";
+			reg = <0x0 0x0c000000 0x0 0x400000>;
+			interrupts-extended = <&cpu0intc 0x0b>, <&cpu0intc 0x09>,
+					      <&cpu1intc 0x0b>, <&cpu1intc 0x09>;
+			interrupt-controller;
+			#address-cells = <0x00>;
+			#interrupt-cells = <0x02>;
+			riscv,ndev = <0x47>;
+		};
+
+		plmt: timer@c400000 {
+			compatible = "metanoia,mt2824-plmt", "andestech,plmt0";
+			reg = <0x0 0x0c400000 0x0 0x00400000>;
+			interrupts-extended = <&cpu0intc 0x07>,
+					      <&cpu1intc 0x07>;
+		};
+
+		plicsw: interrupt-controller@c800000 {
+			compatible = "metanoia,mt2824-plicsw", "andestech,plicsw";
+			reg = <0x0 0x0c800000 0x0 0x400000>;
+			interrupts-extended = <&cpu0intc 0x03>,
+					      <&cpu1intc 0x03>;
+		};
+
+		reboot: reboot@10000004 {
+			compatible = "metanoia,mt2824-reboot";
+			reg = <0x0 0x10000004 0x0 0x08>;
+		};
+
+		rst: reset-controller@1000000c {
+			#reset-cells = <1>;
+			compatible = "metanoia,mt2824-reset";
+			reg = <0x0 0x1000000c 0x0 0x04>;
+		};
+
+		watchdog: watchdog@10090000 {
+			compatible = "metanoia,mt2824-wdt", "andestech,ae350-wdt";
+			reg = <0x0 0x10090000 0x0 0x10000>;
+			clocks = <&ext_clk>;
+			andestech,clock-source = <0>;
+			timeout-sec = <10>;
+			status = "disabled";
+		};
+
+		serial0: serial@100e0000 {
+			compatible = "ns16550a";
+			reg = <0x0 0x100e0000 0x0 0x1000>;
+			interrupts = <17 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&pclk_div4>;
+			current-speed = <115200>;
+			reg-shift = <0x02>;
+			reg-offset = <0x20>;
+			reg-io-width = <0x04>;
+			no-loopback-test;
+			status = "disabled";
+		};
+
+		serial1: serial@100f0000 {
+			compatible = "ns16550a";
+			reg = <0x0 0x100f0000 0x0 0x1000>;
+			interrupts = <18 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&pclk_div4>;
+			current-speed = <115200>;
+			reg-shift = <0x02>;
+			reg-offset = <0x20>;
+			reg-io-width = <0x04>;
+			no-loopback-test;
+			status = "disabled";
+		};
+
+		qspi: spi@10120000 {
+			compatible = "metanoia,mt2824-spi", "andestech,ae350-spi";
+			reg = <0x0 0x10120000 0x0 0x10000>;
+			interrupts = <13 IRQ_TYPE_LEVEL_HIGH>;
+			#address-cells = <0x01>;
+			#size-cells = <0x00>;
+			num-cs = <0x01>;
+			clocks = <&pll_soc_out3>;
+			status = "disabled";
+		};
+
+		spi0: spi@10130000 {
+			compatible = "metanoia,mt2824-spi", "andestech,ae350-spi";
+			reg = <0x0 0x10130000 0x0 0x10000>;
+			#address-cells = <0x01>;
+			#size-cells = <0x00>;
+			num-cs = <0x01>;
+			clocks = <&pll_soc_out3>;
+			status = "disabled";
+		};
+
+		spi1: spi@10140000 {
+			compatible = "metanoia,mt2824-spi", "andestech,ae350-spi";
+			reg = <0x0 0x10140000 0x0 0x10000>;
+			interrupts = <19 IRQ_TYPE_LEVEL_HIGH>;
+			#address-cells = <0x01>;
+			#size-cells = <0x00>;
+			num-cs = <0x01>;
+			clocks = <&pll_soc_out3>;
+			status = "disabled";
+		};
+
+		spi2: spi@10150000 {
+			compatible = "metanoia,mt2824-spi", "andestech,ae350-spi";
+			reg = <0x0 0x10150000 0x0 0x10000>;
+			#address-cells = <0x01>;
+			#size-cells = <0x00>;
+			num-cs = <0x01>;
+			clocks = <&pll_soc_out3>;
+			status = "disabled";
+		};
+
+		spi3: spi@10160000 {
+			compatible = "metanoia,mt2824-spi", "andestech,ae350-spi";
+			reg = <0x0 0x10160000 0x0 0x10000>;
+			#address-cells = <0x01>;
+			#size-cells = <0x00>;
+			num-cs = <0x01>;
+			clocks = <&pll_soc_out3>;
+			status = "disabled";
+		};
+
+		spi4: spi@10170000 {
+			compatible = "metanoia,mt2824-spi", "andestech,ae350-spi";
+			reg = <0x0 0x10170000 0x0 0x10000>;
+			#address-cells = <0x01>;
+			#size-cells = <0x00>;
+			num-cs = <0x01>;
+			clocks = <&pll_soc_out3>;
+			status = "disabled";
+		};
+
+		spi5: spi@10180000 {
+			compatible = "metanoia,mt2824-spi", "andestech,ae350-spi";
+			reg = <0x0 0x10180000 0x0 0x10000>;
+			#address-cells = <0x01>;
+			#size-cells = <0x00>;
+			num-cs = <0x01>;
+			clocks = <&pll_soc_out3>;
+			status = "disabled";
+		};
+
+		spi6: spi@10190000 {
+			compatible = "metanoia,mt2824-spi", "andestech,ae350-spi";
+			reg = <0x0 0x10190000 0x0 0x10000>;
+			#address-cells = <0x01>;
+			#size-cells = <0x00>;
+			num-cs = <0x01>;
+			clocks = <&pll_soc_out3>;
+			status = "disabled";
+		};
+
+		spi7: spi@101a0000 {
+			compatible = "metanoia,mt2824-spi", "andestech,ae350-spi";
+			reg = <0x0 0x101a0000 0x0 0x10000>;
+			#address-cells = <0x01>;
+			#size-cells = <0x00>;
+			num-cs = <0x01>;
+			clocks = <&pll_soc_out3>;
+			status = "disabled";
+		};
+	};
+
+	usb2phy: usb2-phy {
+		compatible = "metanoia,mt2824-usb2-phy";
+		#phy-cells = <0>;
+		resets = <&rst 18>;
+		reset-names = "usb2-phy";
+	};
+
+	reserved-memory {
+		#address-cells = <0x2>;
+		#size-cells = <0x2>;
+		ranges;
+
+		/* for the DSPs, configured as non-cacheable in openSBI */
+		rsc_table: rsc-table@81000000 {
+			reg = <0x0 0x81000000 0x0 0x10000>;
+			no-map;
+		};
+	};
+};
diff --git a/arch/riscv/boot/dts/metanoia/mt5824-evb.dts b/arch/riscv/boot/dts/metanoia/mt5824-evb.dts
new file mode 100644
index 000000000000..d0e8eb0a49a4
--- /dev/null
+++ b/arch/riscv/boot/dts/metanoia/mt5824-evb.dts
@@ -0,0 +1,81 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Copyright (C) 2026 Metanoia Communications Inc.. All rights reserved.
+ */
+
+/dts-v1/;
+
+#include "mt2824.dtsi"
+
+/ {
+	model = "Metanoia MT5824 EVB";
+	compatible = "metanoia,mt5824-evb", "metanoia,mt2824";
+
+	aliases {
+		uart0 = &serial0;
+		uart1 = &serial1;
+		spi0 = &spi0;
+		spi1 = &spi1;
+		spi2 = &spi2;
+	};
+
+	chosen {
+		stdout-path = "uart0:115200n8";
+	};
+
+	memory@80000000 {
+		device_type = "memory";
+		reg = <0x0 0x80000000 0x0 0x80000000>,
+		      <0x1 0x00000000 0x0 0x80000000>;
+	};
+};
+
+&usb0 {
+	status = "okay";
+};
+
+&mmcsd {
+	bus-width = <8>;
+	mmc-ddr-1_8v;
+	mmc-hs200-1_8v;
+	mmc-hs400-1_8v;
+	no-sdio;
+	disable-wp;
+	cap-mmc-hw-reset;
+	status = "okay";
+};
+
+&watchdog {
+	status = "okay";
+};
+
+&serial0 {
+	status = "okay";
+};
+
+&serial1 {
+	status = "okay";
+};
+
+&qspi {
+	status = "okay";
+	flash@0 {
+		compatible = "jedec,spi-nor";
+		spi-rx-bus-width = <0x4>;
+		spi-tx-bus-width = <0x4>;
+		spi-max-frequency = <100000000>;
+		reg = <0x0>;
+	};
+};
+
+&spi0 {
+	status = "okay";
+};
+
+&spi1 {
+	status = "okay";
+};
+
+&spi2 {
+	status = "okay";
+};

-- 
2.56.0