[PATCH 3/3] riscv64: dts: sophgo: add initial Milk-V Duo S board support

[Inochi Amaoto]

On Fri, Oct 10, 2025 at 09:48:11PM -0400, Joshua Milas wrote:
> This adds initial riscv 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 at gmail.com>
> ---
>  arch/riscv/boot/dts/sophgo/Makefile           |   1 +
>  .../boot/dts/sophgo/cv1812h-milkv-duo-s.dts   | 110 ++++++++++++++++++
>  2 files changed, 111 insertions(+)
>  create mode 100644 arch/riscv/boot/dts/sophgo/cv1812h-milkv-duo-s.dts
> 
> diff --git a/arch/riscv/boot/dts/sophgo/Makefile b/arch/riscv/boot/dts/sophgo/Makefile
> index 6f65526d4193..49d6ae4724ea 100644
> --- a/arch/riscv/boot/dts/sophgo/Makefile
> +++ b/arch/riscv/boot/dts/sophgo/Makefile
> @@ -1,6 +1,7 @@
>  # SPDX-License-Identifier: GPL-2.0
>  dtb-$(CONFIG_ARCH_SOPHGO) += cv1800b-milkv-duo.dtb
>  dtb-$(CONFIG_ARCH_SOPHGO) += cv1812h-huashan-pi.dtb
> +dtb-$(CONFIG_ARCH_SOPHGO) += cv1812h-milkv-duo-s.dtb
>  dtb-$(CONFIG_ARCH_SOPHGO) += sg2002-licheerv-nano-b.dtb
>  dtb-$(CONFIG_ARCH_SOPHGO) += sg2042-milkv-pioneer.dtb
>  dtb-$(CONFIG_ARCH_SOPHGO) += sg2042-evb-v1.dtb
> diff --git a/arch/riscv/boot/dts/sophgo/cv1812h-milkv-duo-s.dts b/arch/riscv/boot/dts/sophgo/cv1812h-milkv-duo-s.dts
> new file mode 100644
> index 000000000000..2ab46ec1fc0e
> --- /dev/null
> +++ b/arch/riscv/boot/dts/sophgo/cv1812h-milkv-duo-s.dts
> @@ -0,0 +1,110 @@
> +// SPDX-License-Identifier: (GPL-2.0 OR MIT)
> +
> +/dts-v1/;
> +
> +#include <dt-bindings/pinctrl/pinctrl-cv1812h.h>

> +#include "cv1812h.dtsi"

SG2000 is different with CV1812H, add a new sg2000.dtsi instead.

Regards,
Inochi

> +
> +/ {
> +	model = "Milk-V Duo S";
> +	compatible = "milkv,duo-s", "sophgo,cv1812h";
> +
> +	aliases {
> +		mmc0 = &sdhci0;
> +		serial0 = &uart0;
> +		serial1 = &uart1;
> +		serial2 = &uart2;
> +		serial3 = &uart3;
> +	};
> +
> +	chosen {
> +		stdout-path = "serial0:115200n8";
> +	};
> +};
> +
> +&osc {
> +	clock-frequency = <25000000>;
> +};
> +
> +&dmac {
> +	status = "okay";
> +};
> +
> +&emmc {
> +	bus-width = <4>;
> +	no-1-8-v;
> +	cap-mmc-hw-reset;
> +	no-sd;
> +	no-sdio;
> +	non-removable;
> +	status = "okay";
> +};
> +
> +&gmac0 {
> +	status = "okay";
> +};
> +
> +&i2c1 {
> +	status = "okay";
> +};
> +
> +&i2c2 {
> +	status = "okay";
> +};
> +
> +&i2c3 {
> +	status = "okay";
> +};
> +
> +&i2c4 {
> +	status = "okay";
> +};
> +
> +&mdio {
> +	status = "okay";
> +};
> +
> +&saradc {
> +	status = "okay";
> +};
> +
> +&sdhci0 {
> +	bus-width = <4>;
> +	no-1-8-v;
> +	disable-wp;
> +	status = "okay";
> +};
> +
> +&sdhci1 {
> +	bus-width = <4>;
> +	cap-sdio-irq;
> +	no-mmc;
> +	no-sd;
> +	non-removable;
> +	status = "okay";
> +};
> +
> +&spi0 {
> +	status = "okay";
> +};
> +
> +&spi3 {
> +	status = "okay";
> +};
> +
> +&uart0 {
> +	status = "okay";
> +};
> +
> +&uart1 {
> +	status = "okay";
> +};
> +
> +&uart2 {
> +	status = "okay";
> +};
> +
> +&uart3 {
> +	status = "okay";
> +};
> +
> -- 
> 2.51.0
>