[PATCH v5 5/5] riscv64: dts: sophgo: add initial Milk-V Duo S board support

[Gui-Dong Han]

On Fri, Apr 3, 2026 at 7:16 PM Joshua Milas <josh.milas at gmail.com> 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>

Great work, thanks Joshua! I really like this board.

I encountered the same issue Michael Opdenacker saw in v4, but
enabling the MDIO-related configs resolved it.

I'll keep using and testing this series and provide further feedback
if anything comes up. Next, I plan to test the arm64 side and will
also try developing an efuse driver.

Tested-by: Gui-Dong Han <hanguidong02 at gmail.com>
Reviewed-by: Gui-Dong Han <hanguidong02 at gmail.com>

> ---
>  arch/riscv/boot/dts/sophgo/Makefile           |  1 +
>  .../boot/dts/sophgo/sg2000-milkv-duo-s.dts    | 85 +++++++++++++++++++
>  2 files changed, 86 insertions(+)
>  create mode 100644 arch/riscv/boot/dts/sophgo/sg2000-milkv-duo-s.dts
>
> diff --git a/arch/riscv/boot/dts/sophgo/Makefile b/arch/riscv/boot/dts/sophgo/Makefile
> index 6f65526d4193b..58cc6b70d8de4 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-$(CONFIG_ARCH_SOPHGO) += sg2000-milkv-duo-s.dtb
>  dtb-$(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/sg2000-milkv-duo-s.dts b/arch/riscv/boot/dts/sophgo/sg2000-milkv-duo-s.dts
> new file mode 100644
> index 0000000000000..8632470f43ab0
> --- /dev/null
> +++ b/arch/riscv/boot/dts/sophgo/sg2000-milkv-duo-s.dts
> @@ -0,0 +1,85 @@
> +// SPDX-License-Identifier: (GPL-2.0 OR MIT)
> +
> +/dts-v1/;
> +
> +#include "sg2000.dtsi"
> +
> +/ {
> +       model = "Milk-V Duo S";
> +       compatible = "milkv,duo-s", "sophgo,sg2000";
> +
> +       aliases {
> +               i2c4 = &i2c4;
> +               mmc0 = &sdhci0;
> +               serial0 = &uart0;
> +               spi3 = &spi3;
> +       };
> +
> +       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";
> +};
> +
> +&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";
> +};
> +
> +&spi3 {
> +       status = "okay";
> +};
> +
> +&uart0 {
> +       status = "okay";
> +};
> +
> +&usb {
> +       dr_mode = "host";
> +       status = "okay";
> +};
> +
> --
> 2.53.0
>