From d5e1ea5b05fe62c296701251c628ced6c68a6a80 Mon Sep 17 00:00:00 2001
From: Joshua Milas <josh.milas@gmail.com>
Date: Mon, 15 Jun 2026 08:03:22 -0400
Subject: [PATCH] arm64: dts: sophgo: add initial Milk-V Duo S board support

Adds initial arm64 support for the Milk-V Duo S board
[1] making it possible to boot Linux to the command line.

Link: https://milkv.io/duo-s [1]

Signed-off-by: Joshua Milas <josh.milas@gmail.com>
Link: https://milkv.io/duo-s [1]
Link: https://patch.msgid.link/20260615120324.1527881-2-josh.milas@gmail.com
Signed-off-by: Inochi Amaoto <inochiama@gmail.com> # Trim empty line
Signed-off-by: Chen Wang <chen.wang@linux.dev>
---
 arch/arm64/boot/dts/sophgo/Makefile           |   1 +
 .../boot/dts/sophgo/sg2000-milkv-duo-s.dts    | 244 ++++++++++++++++++
 2 files changed, 245 insertions(+)
 create mode 100644 arch/arm64/boot/dts/sophgo/sg2000-milkv-duo-s.dts

diff --git a/arch/arm64/boot/dts/sophgo/Makefile b/arch/arm64/boot/dts/sophgo/Makefile
index 94f52cd7d994..68aace728223 100644
--- a/arch/arm64/boot/dts/sophgo/Makefile
+++ b/arch/arm64/boot/dts/sophgo/Makefile
@@ -1,2 +1,3 @@
 # SPDX-License-Identifier: GPL-2.0
 dtb-$(CONFIG_ARCH_SOPHGO) += sg2000-milkv-duo-module-01-evb.dtb
+dtb-$(CONFIG_ARCH_SOPHGO) += sg2000-milkv-duo-s.dtb
diff --git a/arch/arm64/boot/dts/sophgo/sg2000-milkv-duo-s.dts b/arch/arm64/boot/dts/sophgo/sg2000-milkv-duo-s.dts
new file mode 100644
index 000000000000..78a257839f6f
--- /dev/null
+++ b/arch/arm64/boot/dts/sophgo/sg2000-milkv-duo-s.dts
@@ -0,0 +1,244 @@
+// SPDX-License-Identifier: (GPL-2.0 OR MIT)
+
+/dts-v1/;
+
+#include <dt-bindings/pinctrl/pinctrl-sg2000.h>
+#include "sg2000.dtsi"
+
+/ {
+	model = "Milk-V Duo S";
+	compatible = "milkv,duo-s", "sophgo,sg2000";
+
+	aliases {
+		i2c4 = &i2c4;
+		mmc0 = &sdhci0;
+		mmc1 = &emmc;
+		mmc2 = &sdhci1;
+		serial0 = &uart0;
+		serial4 = &uart4;
+	};
+
+	chosen {
+		stdout-path = "serial0:115200n8";
+	};
+
+	wifi_pwrseq: wifi-pwrseq {
+		compatible = "mmc-pwrseq-simple";
+		reset-gpios = <&porta 15 GPIO_ACTIVE_LOW>;
+		power-off-delay-us = <50000>;
+		post-power-on-delay-ms = <200>;
+	};
+};
+
+&osc {
+	clock-frequency = <25000000>;
+};
+
+&pinctrl {
+	emmc_cfg: emmc-cfg {
+		emmc-rstn-pins {
+			pinmux = <PINMUX(PIN_EMMC_RSTN, 0)>;
+			bias-pull-up;
+			drive-strength-microamp = <10800>;
+			power-source = <1800>;
+		};
+
+		emmc-clk-pins {
+			pinmux = <PINMUX(PIN_EMMC_CLK, 0)>;
+			bias-pull-up;
+			drive-strength-microamp = <10800>;
+			power-source = <1800>;
+		};
+
+		emmc-cmd-pins {
+			pinmux = <PINMUX(PIN_EMMC_CMD, 0)>;
+			bias-pull-up;
+			drive-strength-microamp = <10800>;
+			power-source = <1800>;
+		};
+
+		emmc-data-pins {
+			pinmux = <PINMUX(PIN_EMMC_DAT0, 0)>,
+				 <PINMUX(PIN_EMMC_DAT1, 0)>,
+				 <PINMUX(PIN_EMMC_DAT2, 0)>,
+				 <PINMUX(PIN_EMMC_DAT3, 0)>;
+			bias-pull-up;
+			drive-strength-microamp = <10800>;
+			power-source = <1800>;
+		};
+	};
+
+	i2c4_cfg: i2c4-cfg {
+		i2c4-pins {
+			pinmux = <PINMUX(PIN_VIVO_D1, 7)>,
+				 <PINMUX(PIN_VIVO_D0, 7)>;
+			bias-pull-up;
+			drive-strength-microamp = <4000>;
+			power-source = <1800>;
+		};
+	};
+
+	sdhci0_cfg: sdhci0-cfg {
+		sdhci0-cd-pins {
+			pinmux = <PINMUX(PIN_SD0_CD, 0)>;
+			bias-pull-up;
+			drive-strength-microamp = <10800>;
+			power-source = <3300>;
+		};
+
+		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>;
+		};
+	};
+
+	sdhci1_cfg: sdhci1-cfg {
+		sdhci1-clk-pins {
+			pinmux = <PINMUX(PIN_MIPI_TXM4, 1)>;
+			bias-pull-up;
+			drive-strength-microamp = <10800>;
+			power-source = <1800>;
+		};
+
+		sdhci1-cmd-pins {
+			pinmux = <PINMUX(PIN_MIPI_TXP4, 1)>;
+			bias-pull-up;
+			drive-strength-microamp = <10800>;
+			power-source = <1800>;
+		};
+
+		sdhci1-data-pins {
+			pinmux = <PINMUX(PIN_MIPI_TXM3, 1)>,
+				 <PINMUX(PIN_MIPI_TXP3, 1)>,
+				 <PINMUX(PIN_MIPI_TXM2, 7)>,
+				 <PINMUX(PIN_MIPI_TXP2, 7)>;
+			bias-pull-up;
+			drive-strength-microamp = <10800>;
+			power-source = <1800>;
+		};
+	};
+
+	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>;
+		};
+	};
+
+	uart4_cfg: uart4-cfg {
+		uart4-data-pins {
+			pinmux = <PINMUX(PIN_UART2_TX, 5)>,
+				 <PINMUX(PIN_UART2_RX, 5)>;
+			drive-strength-microamp = <10800>;
+			power-source = <3300>;
+		};
+
+		uart4-control-pins {
+			pinmux = <PINMUX(PIN_UART2_CTS, 5)>,
+				 <PINMUX(PIN_UART2_RTS, 5)>;
+			bias-pull-up;
+			drive-strength-microamp = <10800>;
+			power-source = <3300>;
+		};
+	};
+};
+
+&dmac {
+	status = "okay";
+};
+
+&emmc {
+	bus-width = <4>;
+	no-1-8-v;
+	cap-mmc-hw-reset;
+	no-sd;
+	no-sdio;
+	non-removable;
+	pinctrl-0 = <&emmc_cfg>;
+	pinctrl-names = "default";
+	status = "okay";
+};
+
+&gmac0 {
+	status = "okay";
+};
+
+&i2c4 {
+	pinctrl-0 = <&i2c4_cfg>;
+	pinctrl-names = "default";
+	status = "okay";
+};
+
+&mdio {
+	status = "okay";
+};
+
+&saradc {
+	status = "okay";
+};
+
+&sdhci0 {
+	bus-width = <4>;
+	disable-wp;
+	no-1-8-v;
+	pinctrl-0 = <&sdhci0_cfg>;
+	pinctrl-names = "default";
+	status = "okay";
+};
+
+&sdhci1 {
+	bus-width = <4>;
+	cap-sdio-irq;
+	cap-sd-highspeed;
+	keep-power-in-suspend;
+	no-mmc;
+	no-sd;
+	non-removable;
+	max-frequency = <150000000>;
+	mmc-pwrseq = <&wifi_pwrseq>;
+	pinctrl-0 = <&sdhci1_cfg>;
+	pinctrl-names = "default";
+	sd-uhs-sdr50;
+	sd-uhs-sdr104;
+	status = "okay";
+};
+
+&uart0 {
+	pinctrl-0 = <&uart0_cfg>;
+	pinctrl-names = "default";
+	status = "okay";
+};
+
+&uart4 {
+	pinctrl-0 = <&uart4_cfg>;
+	pinctrl-names = "default";
+	uart-has-rtscts;
+	status = "okay";
+};
+
+&usb {
+	dr_mode = "host";
+	status = "okay";
+};