Add MilkV Duo 256M device trees

Documentation/devicetree/bindings/soc/sophgo/sophgo.yaml

@@ -31,6 +31,10 @@ properties:
               - milkv,duo-module-01-evb
           - const: milkv,duo-module-01
           - const: sophgo,sg2000
+      - items:
+          - enum:
+              - milkv,duo256m
+          - const: sophgo,sg2002
       - items:
           - enum:
               - sipeed,licheerv-nano-b

arch/riscv/boot/dts/sophgo/Makefile

@@ -2,6 +2,7 @@
 dtb-$(CONFIG_ARCH_SOPHGO) += cv1800b-milkv-duo.dtb
 dtb-$(CONFIG_ARCH_SOPHGO) += cv1812h-huashan-pi.dtb
 dtb-$(CONFIG_ARCH_SOPHGO) += sg2002-licheerv-nano-b.dtb
+dtb-$(CONFIG_ARCH_SOPHGO) += sg2002-milkv-duo-256m.dtb
 dtb-$(CONFIG_ARCH_SOPHGO) += sg2042-milkv-pioneer.dtb
 dtb-$(CONFIG_ARCH_SOPHGO) += sg2042-evb-v1.dtb
 dtb-$(CONFIG_ARCH_SOPHGO) += sg2042-evb-v2.dtb

arch/riscv/boot/dts/sophgo/cv1800b-milkv-duo.dts

@@ -5,6 +5,7 @@
 
 /dts-v1/;
 
+#include <dt-bindings/leds/common.h>
 #include "cv1800b.dtsi"
 
 / {
@@ -33,6 +34,14 @@
 			no-map;
 		};
 	};
+
+	gpio-leds {
+		compatible = "gpio-leds";
+
+		blue_led {
+			gpios = <&portc 22 GPIO_ACTIVE_HIGH>;
+		};
+	};
 };
 
 &osc {

arch/riscv/boot/dts/sophgo/cv180x.dtsi

@@ -160,6 +160,25 @@
 			};
 		};
 
+		gpio4: gpio@5021000 {
+			compatible = "snps,dw-apb-gpio";
+			reg = <0x5021000 0x1000>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+			resets = <&rst RST_GPIO4>;
+
+			porte: gpio-controller@0 {
+				compatible = "snps,dw-apb-gpio-port";
+				gpio-controller;
+				#gpio-cells = <2>;
+				ngpios = <32>;
+				reg = <0>;
+				interrupt-controller;
+				#interrupt-cells = <2>;
+				interrupts = <SOC_PERIPHERAL_IRQ(48) IRQ_TYPE_LEVEL_HIGH>;
+			};
+		};
+
 		saradc: adc@30f0000 {
 			compatible = "sophgo,cv1800b-saradc";
 			reg = <0x030f0000 0x1000>;
@@ -438,8 +457,8 @@
 			clocks = <&clk CLK_AXI4_USB>, <&clk CLK_APB_USB>;
 			clock-names = "otg", "utmi";
 			g-np-tx-fifo-size = <32>;
-			g-rx-fifo-size = <536>;
-			g-tx-fifo-size = <768 512 512 384 128 128>;
+			g-rx-fifo-size = <1536>;
+			g-tx-fifo-size = <128 128 64 64 64 64 32 32>;
 			interrupts = <SOC_PERIPHERAL_IRQ(14) IRQ_TYPE_LEVEL_HIGH>;
 			phys = <&usbphy>;
 			phy-names = "usb2-phy";

arch/riscv/boot/dts/sophgo/cv18xx-reset.h

@@ -38,6 +38,7 @@
 #define RST_PWM1			33
 #define RST_PWM2			34
 #define RST_PWM3			35
+#define RST_GPIO4			36
 #define RST_SPI0			40
 #define RST_SPI1			41
 #define RST_SPI2			42

arch/riscv/boot/dts/sophgo/sg2002-milkv-duo-256m.dts

@@ -0,0 +1,109 @@
+// SPDX-License-Identifier: (GPL-2.0 OR MIT)
+/*
+ * Copyright (C) 2025 Amir Dahan <system64fumo@tuta.io>
+ */
+
+/dts-v1/;
+
+#include <dt-bindings/leds/common.h>
+#include "sg2002.dtsi"
+
+/ {
+	model = "Milk-V Duo256M";
+	compatible = "milkv,duo256m", "sophgo,sg2002";
+
+	aliases {
+		gpio0 = &gpio0;
+		gpio1 = &gpio1;
+		gpio2 = &gpio2;
+		gpio3 = &gpio3;
+		serial0 = &uart0;
+		serial1 = &uart1;
+		serial2 = &uart2;
+		serial3 = &uart3;
+		serial4 = &uart4;
+	};
+
+	chosen {
+		stdout-path = "serial0:115200n8";
+	};
+
+	gpio-leds {
+		compatible = "gpio-leds";
+
+		blue_led {
+			gpios = <&porte 2 GPIO_ACTIVE_HIGH>;
+		};
+	};
+};
+
+&osc {
+	clock-frequency = <25000000>;
+};
+
+&pinctrl {
+	uart0_cfg: uart0-cfg {
+		uart0-pins {
+			pinmux = <PINMUX(PIN_UART0_TX, 0)>,
+				 <PINMUX(PIN_UART0_RX, 0)>;
+			bias-pull-up;
+			drive-strength-microamp = <10800>;
+			power-source = <3300>;
+		};
+	};
+
+	sdhci0_cfg: sdhci0-cfg {
+		sdhci0-clk-pins {
+			pinmux = <PINMUX(PIN_SD0_CLK, 0)>;
+			bias-pull-up;
+			drive-strength-microamp = <16100>;
+			power-source = <3300>;
+		};
+
+		sdhci0-cmd-pins {
+			pinmux = <PINMUX(PIN_SD0_CMD, 0)>;
+			bias-pull-up;
+			drive-strength-microamp = <10800>;
+			power-source = <3300>;
+		};
+
+		sdhci0-data-pins {
+			pinmux = <PINMUX(PIN_SD0_D0, 0)>,
+				 <PINMUX(PIN_SD0_D1, 0)>,
+				 <PINMUX(PIN_SD0_D2, 0)>,
+				 <PINMUX(PIN_SD0_D3, 0)>;
+			bias-pull-up;
+			drive-strength-microamp = <10800>;
+			power-source = <3300>;
+		};
+
+		sdhci0-cd-pins {
+			pinmux = <PINMUX(PIN_SD0_CD, 0)>;
+			bias-pull-up;
+			drive-strength-microamp = <10800>;
+			power-source = <3300>;
+		};
+	};
+};
+
+&sdhci0 {
+	pinctrl-0 = <&sdhci0_cfg>;
+	pinctrl-names = "default";
+	status = "okay";
+	bus-width = <4>;
+	no-1-8-v;
+	no-mmc;
+	no-sdio;
+	disable-wp;
+};
+
+&uart0 {
+	pinctrl-0 = <&uart0_cfg>;
+	pinctrl-names = "default";
+	status = "okay";
+};
+
+&usb {
+	dr_mode = "host";
+	status = "okay";
+};