[PATCH 0/2] Add initial Milk-V Duo S board support

[PATCH 0/2] Add initial Milk-V Duo S board support

[Joshua Milas]

This adds an initial device tree for the Milk-V Duo S board
with support for reading from the SD card. This is continued
work from Michael Opdenacker's v6 series on the ARM64 side.
I'm still working on confirming the RISCV side.

https://lore.kernel.org/linux-riscv/20240421055710.143617-1-michael.opdenacker@bootlin.com/

Patch produced against the "for-next" branch of the sophgo "linux" tree:
https://github.com/sophgo/linux.git

Joshua Milas (2):
  dt-bindings: soc: sophgo: add Milk-V Duo S board compatibles
  arm64: dts: sophgo: add initial Milk-V Duo S board support

 .../bindings/soc/sophgo/sophgo.yaml           |  1 +
 arch/arm64/boot/dts/sophgo/Makefile           |  1 +
 .../boot/dts/sophgo/sg2000-milkv-duo-s.dts    | 88 +++++++++++++++++++
 3 files changed, 90 insertions(+)
 create mode 100644 arch/arm64/boot/dts/sophgo/sg2000-milkv-duo-s.dts

-- 
2.51.0

[PATCH 1/2] dt-bindings: soc: sophgo: add Milk-V Duo S board compatibles

[Joshua Milas]

Document the compatible strings for the Milk-V Duo S board[1]
which uses the SOPHGO SG2000 SoC[2]

Link: https://milkv.io/duo-s [1]
Link: https://en.sophgo.com/sophon-u/product/introduce/sg200x.html [2]

Signed-off-by: Joshua Milas <josh.milas@gmail.com>
---
 Documentation/devicetree/bindings/soc/sophgo/sophgo.yaml | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/devicetree/bindings/soc/sophgo/sophgo.yaml b/Documentation/devicetree/bindings/soc/sophgo/sophgo.yaml
index 1c502618de51..2fcc63b1a036 100644
--- a/Documentation/devicetree/bindings/soc/sophgo/sophgo.yaml
+++ b/Documentation/devicetree/bindings/soc/sophgo/sophgo.yaml
@@ -28,6 +28,7 @@ properties:
           - const: sophgo,cv1812h
       - items:
           - enum:
+              - milkv,duo-s
               - milkv,duo-module-01-evb
           - const: milkv,duo-module-01
           - const: sophgo,sg2000
-- 
2.51.0

[PATCH 2/2] arm64: dts: sophgo: add initial Milk-V Duo S board support

[Joshua Milas]

This adds initial arm64 support for the Milk-V Duo S board
(https://milkv.io/duo-s), enabling the serial port and sdhci0,
making it possible to boot Linux to the command line.

Signed-off-by: Joshua Milas <josh.milas@gmail.com>
---
 arch/arm64/boot/dts/sophgo/Makefile           |  1 +
 .../boot/dts/sophgo/sg2000-milkv-duo-s.dts    | 88 +++++++++++++++++++
 2 files changed, 89 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..94cf89d423de
--- /dev/null
+++ b/arch/arm64/boot/dts/sophgo/sg2000-milkv-duo-s.dts
@@ -0,0 +1,88 @@
+// SPDX-License-Identifier: (GPL-2.0 OR MIT)
+
+/dts-v1/;
+
+#include <dt-bindings/pinctrl/pinctrl-sg2000.h>
+#include "sg2000.dtsi"
+
+/ {
+	model = "Milk-V DuoS";
+	compatible = "milkv,duo-s", "sophgo,sg2000";
+
+	aliases {
+		serial0 = &uart0;
+		mmc0 = &sdhci0;
+	};
+
+	chosen {
+		stdout-path = "serial0:115200n8";
+	};
+};
+
+&osc {
+	clock-frequency = <25000000>;
+};
+
+&pinctrl {
+	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>;
+		};
+	};
+
+	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>;
+		};
+	};
+};
+
+&uart0 {
+	pinctrl-0 = <&uart0_cfg>;
+	pinctrl-names = "default";
+	status = "okay";
+	/delete-property/ resets;
+};
+
+&sdhci0 {
+	bus-width = <4>;
+	no-1-8-v;
+	no-mmc;
+	no-sdio;
+	disable-wp;
+	pinctrl-0 = <&sdhci0_cfg>;
+	pinctrl-names = "default";
+	status = "okay";
+};
+
-- 
2.51.0

Re: [PATCH 1/2] dt-bindings: soc: sophgo: add Milk-V Duo S board compatibles

[E Shattow]

Hi Joshua,

On 9/27/25 10:36, Joshua Milas wrote:
> Document the compatible strings for the Milk-V Duo S board[1]
> which uses the SOPHGO SG2000 SoC[2]
> 
> Link: https://milkv.io/duo-s [1]
> Link: https://en.sophgo.com/sophon-u/product/introduce/sg200x.html [2]
> 
> Signed-off-by: Joshua Milas <josh.milas@gmail.com>
> ---
>  Documentation/devicetree/bindings/soc/sophgo/sophgo.yaml | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/Documentation/devicetree/bindings/soc/sophgo/sophgo.yaml b/Documentation/devicetree/bindings/soc/sophgo/sophgo.yaml
> index 1c502618de51..2fcc63b1a036 100644
> --- a/Documentation/devicetree/bindings/soc/sophgo/sophgo.yaml
> +++ b/Documentation/devicetree/bindings/soc/sophgo/sophgo.yaml
> @@ -28,6 +28,7 @@ properties:
>            - const: sophgo,cv1812h
>        - items:

>            - enum:
> +              - milkv,duo-s
>                - milkv,duo-module-01-evb

Sort enums.

>            - const: milkv,duo-module-01
>            - const: sophgo,sg2000

Best regards,

-E Shattow

Re: [PATCH 2/2] arm64: dts: sophgo: add initial Milk-V Duo S board support

[E Shattow]

Hi Joshua,

On 9/27/25 10:36, Joshua Milas wrote:
> This adds initial arm64 support for the Milk-V Duo S board
> (https://milkv.io/duo-s), enabling the serial port and sdhci0,
> making it possible to boot Linux to the command line.
>
> Signed-off-by: Joshua Milas <josh.milas@gmail.com>
> ---
>  arch/arm64/boot/dts/sophgo/Makefile           |  1 +
>  .../boot/dts/sophgo/sg2000-milkv-duo-s.dts    | 88 +++++++++++++++++++
>  2 files changed, 89 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..94cf89d423de
> --- /dev/null
> +++ b/arch/arm64/boot/dts/sophgo/sg2000-milkv-duo-s.dts
> @@ -0,0 +1,88 @@
> +// SPDX-License-Identifier: (GPL-2.0 OR MIT)
> +
> +/dts-v1/;
> +
> +#include <dt-bindings/pinctrl/pinctrl-sg2000.h>
> +#include "sg2000.dtsi"
> +
> +/ {
> +	model = "Milk-V DuoS";
> +	compatible = "milkv,duo-s", "sophgo,sg2000";
"Milk-V Duo S" with "milkv,duo-s, "sophgo,sg2000"

or

"Milk-V Duo S" with milkv,duos, "sophgo,sg2000"

and dts filename to agree.

> +
> +	aliases {
> +		serial0 = &uart0;
> +		mmc0 = &sdhci0;
> +	};
Sort aliases.

> +
> +	chosen {
> +		stdout-path = "serial0:115200n8";
> +	};
> +};
> +
> +&osc {
> +	clock-frequency = <25000000>;
> +};
> +
> +&pinctrl {
> +	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>;
> +		};
> +	};
> +
> +	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>;
> +		};
> +	};
> +};
> +
> +&uart0 {
> +	pinctrl-0 = <&uart0_cfg>;
> +	pinctrl-names = "default";
> +	status = "okay";
> +	/delete-property/ resets;
> +};
Needs parting of resets out from where it is now instead of
delete-property here. I don't know if that can be the same series.

> +
> +&sdhci0 {
> +	bus-width = <4>;
> +	no-1-8-v;
> +	no-mmc;
> +	no-sdio;
Unlikely to need 'no-mmc' 'no-sdio'. Test without, and drop?

> +	disable-wp;
> +	pinctrl-0 = <&sdhci0_cfg>;
> +	pinctrl-names = "default";
> +	status = "okay";
> +};
> +
Please use '--base=' with git format-patch so we will know the commit id
your series is based from.

Best regards,

-E Shattow

Re: [PATCH 2/2] arm64: dts: sophgo: add initial Milk-V Duo S board support

[Alexander Sverdlin]

Hi!

On Sat, 2025-09-27 at 21:09 -0700, E Shattow wrote:
> > --- /dev/null
> > +++ b/arch/arm64/boot/dts/sophgo/sg2000-milkv-duo-s.dts
> > @@ -0,0 +1,88 @@
> > +// SPDX-License-Identifier: (GPL-2.0 OR MIT)
> > +
> > +/dts-v1/;
> > +
> > +#include <dt-bindings/pinctrl/pinctrl-sg2000.h>
> > +#include "sg2000.dtsi"
> > +
> > +/ {
> > +	model = "Milk-V DuoS";
> > +	compatible = "milkv,duo-s", "sophgo,sg2000";

[]

> > +&uart0 {
> > +	pinctrl-0 = <&uart0_cfg>;
> > +	pinctrl-names = "default";
> > +	status = "okay";
> > +	/delete-property/ resets;
> > +};
> Needs parting of resets out from where it is now instead of
> delete-property here. I don't know if that can be the same series.

I wonder why is it necessary to remove "resets" at all, if it's
exactly the SG2000 SoC. What is the exact problem with them?

-- 
Alexander Sverdlin.

Re: [PATCH 0/2] Add initial Milk-V Duo S board support

[Rob Herring (Arm)]

On Sat, 27 Sep 2025 13:36:17 -0400, Joshua Milas wrote:
> This adds an initial device tree for the Milk-V Duo S board
> with support for reading from the SD card. This is continued
> work from Michael Opdenacker's v6 series on the ARM64 side.
> I'm still working on confirming the RISCV side.
> 
> https://lore.kernel.org/linux-riscv/20240421055710.143617-1-michael.opdenacker@bootlin.com/
> 
> Patch produced against the "for-next" branch of the sophgo "linux" tree:
> https://github.com/sophgo/linux.git
> 
> Joshua Milas (2):
>   dt-bindings: soc: sophgo: add Milk-V Duo S board compatibles
>   arm64: dts: sophgo: add initial Milk-V Duo S board support
> 
>  .../bindings/soc/sophgo/sophgo.yaml           |  1 +
>  arch/arm64/boot/dts/sophgo/Makefile           |  1 +
>  .../boot/dts/sophgo/sg2000-milkv-duo-s.dts    | 88 +++++++++++++++++++
>  3 files changed, 90 insertions(+)
>  create mode 100644 arch/arm64/boot/dts/sophgo/sg2000-milkv-duo-s.dts
> 
> --
> 2.51.0
> 
> 
> 


My bot found new DTB warnings on the .dts files added or changed in this
series.

Some warnings may be from an existing SoC .dtsi. Or perhaps the warnings
are fixed by another series. Ultimately, it is up to the platform
maintainer whether these warnings are acceptable or not. No need to reply
unless the platform maintainer has comments.

If you already ran DT checks and didn't see these error(s), then
make sure dt-schema is up to date:

  pip3 install dtschema --upgrade


This patch series was applied (using b4) to base:
 Base: attempting to guess base-commit...
 Base: tags/next-20250926 (exact match)

If this is not the correct base, please add 'base-commit' tag
(or use b4 which does this automatically)

New warnings running 'make CHECK_DTBS=y for arch/arm64/boot/dts/sophgo/' for 20250927173619.89768-1-josh.milas@gmail.com:

arch/arm64/boot/dts/sophgo/sg2000-milkv-duo-s.dtb: / (milkv,duo-s): compatible: 'oneOf' conditional failed, one must be fixed:
	['milkv,duo-s', 'sophgo,sg2000'] is too short
	'milkv,duo-s' is not one of ['milkv,duo']
	'milkv,duo-s' is not one of ['sophgo,huashan-pi']
	'milkv,duo-s' is not one of ['sipeed,licheerv-nano-b']
	'milkv,duo-s' is not one of ['milkv,pioneer', 'sophgo,sg2042-evb-v1', 'sophgo,sg2042-evb-v2']
	'milkv,duo-s' is not one of ['sophgo,srd3-10']
	'sophgo,cv1800b' was expected
	'sophgo,cv1812h' was expected
	'milkv,duo-module-01' was expected
	'sipeed,licheerv-nano' was expected
	'sophgo,sg2042' was expected
	'sophgo,sg2044' was expected
	from schema $id: http://devicetree.org/schemas/soc/sophgo/sophgo.yaml#

Re: [PATCH 0/2] Add initial Milk-V Duo S board support

[Chen Wang]

Hi, Joshua,

Thanks for your post, please loop to linux-riscv@lists.infradead.org 
next time.

On 9/28/2025 1:36 AM, Joshua Milas wrote:
> This adds an initial device tree for the Milk-V Duo S board
> with support for reading from the SD card. This is continued
> work from Michael Opdenacker's v6 series on the ARM64 side.
> I'm still working on confirming the RISCV side.
>
> https://lore.kernel.org/linux-riscv/20240421055710.143617-1-michael.opdenacker@bootlin.com/

Please add prefix & reference number as below:

Link: 
https://lore.kernel.org/linux-riscv/20240421055710.143617-1-michael.opdenacker@bootlin.com/ 
[1]

And you can refer the link as "[1]" in your text.

>
> Patch produced against the "for-next" branch of the sophgo "linux" tree:
> https://github.com/sophgo/linux.git
>
> Joshua Milas (2):
>    dt-bindings: soc: sophgo: add Milk-V Duo S board compatibles
>    arm64: dts: sophgo: add initial Milk-V Duo S board support
>
>   .../bindings/soc/sophgo/sophgo.yaml           |  1 +
>   arch/arm64/boot/dts/sophgo/Makefile           |  1 +
>   .../boot/dts/sophgo/sg2000-milkv-duo-s.dts    | 88 +++++++++++++++++++
>   3 files changed, 90 insertions(+)
>   create mode 100644 arch/arm64/boot/dts/sophgo/sg2000-milkv-duo-s.dts

Regards,

Chen

Re: [PATCH 2/2] arm64: dts: sophgo: add initial Milk-V Duo S board support

[Inochi Amaoto]

On Sat, Sep 27, 2025 at 09:09:30PM -0700, E Shattow wrote:
> Hi Joshua,
> 
> On 9/27/25 10:36, Joshua Milas wrote:
> > This adds initial arm64 support for the Milk-V Duo S board
> > (https://milkv.io/duo-s), enabling the serial port and sdhci0,
> > making it possible to boot Linux to the command line.
> >
> > Signed-off-by: Joshua Milas <josh.milas@gmail.com>
> > ---
> >  arch/arm64/boot/dts/sophgo/Makefile           |  1 +
> >  .../boot/dts/sophgo/sg2000-milkv-duo-s.dts    | 88 +++++++++++++++++++
> >  2 files changed, 89 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..94cf89d423de
> > --- /dev/null
> > +++ b/arch/arm64/boot/dts/sophgo/sg2000-milkv-duo-s.dts
> > @@ -0,0 +1,88 @@
> > +// SPDX-License-Identifier: (GPL-2.0 OR MIT)
> > +
> > +/dts-v1/;
> > +
> > +#include <dt-bindings/pinctrl/pinctrl-sg2000.h>
> > +#include "sg2000.dtsi"
> > +
> > +/ {
> > +	model = "Milk-V DuoS";
> > +	compatible = "milkv,duo-s", "sophgo,sg2000";
> "Milk-V Duo S" with "milkv,duo-s, "sophgo,sg2000"
> 

I prefer this one.

> or
> 
> "Milk-V Duo S" with milkv,duos, "sophgo,sg2000"
> 
> and dts filename to agree.
> 
> > +
> > +	aliases {
> > +		serial0 = &uart0;
> > +		mmc0 = &sdhci0;
> > +	};
> Sort aliases.
> 
> > +
> > +	chosen {
> > +		stdout-path = "serial0:115200n8";
> > +	};
> > +};
> > +
> > +&osc {
> > +	clock-frequency = <25000000>;
> > +};
> > +
> > +&pinctrl {
> > +	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>;
> > +		};
> > +	};
> > +
> > +	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>;
> > +		};
> > +	};
> > +};
> > +
> > +&uart0 {
> > +	pinctrl-0 = <&uart0_cfg>;
> > +	pinctrl-names = "default";
> > +	status = "okay";
> > +	/delete-property/ resets;
> > +};
> Needs parting of resets out from where it is now instead of
> delete-property here. I don't know if that can be the same series.
> 
> > +
> > +&sdhci0 {
> > +	bus-width = <4>;
> > +	no-1-8-v;
> > +	no-mmc;
> > +	no-sdio;
> Unlikely to need 'no-mmc' 'no-sdio'. Test without, and drop?
> 
> > +	disable-wp;
> > +	pinctrl-0 = <&sdhci0_cfg>;
> > +	pinctrl-names = "default";
> > +	status = "okay";
> > +};
> > +
> Please use '--base=' with git format-patch so we will know the commit id
> your series is based from.
> 
> Best regards,
> 
> -E Shattow

Re: [PATCH 2/2] arm64: dts: sophgo: add initial Milk-V Duo S board support

[Inochi Amaoto]

On Sat, Sep 27, 2025 at 01:36:19PM -0400, Joshua Milas wrote:
> This adds initial arm64 support for the Milk-V Duo S board
> (https://milkv.io/duo-s), enabling the serial port and sdhci0,
> making it possible to boot Linux to the command line.
> 
> Signed-off-by: Joshua Milas <josh.milas@gmail.com>
> ---
>  arch/arm64/boot/dts/sophgo/Makefile           |  1 +
>  .../boot/dts/sophgo/sg2000-milkv-duo-s.dts    | 88 +++++++++++++++++++
>  2 files changed, 89 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..94cf89d423de
> --- /dev/null
> +++ b/arch/arm64/boot/dts/sophgo/sg2000-milkv-duo-s.dts
> @@ -0,0 +1,88 @@
> +// SPDX-License-Identifier: (GPL-2.0 OR MIT)
> +
> +/dts-v1/;
> +
> +#include <dt-bindings/pinctrl/pinctrl-sg2000.h>
> +#include "sg2000.dtsi"
> +
> +/ {
> +	model = "Milk-V DuoS";
> +	compatible = "milkv,duo-s", "sophgo,sg2000";
> +
> +	aliases {
> +		serial0 = &uart0;
> +		mmc0 = &sdhci0;
> +	};

It is better for adding gpio and other serial there?

> +
> +	chosen {
> +		stdout-path = "serial0:115200n8";
> +	};
> +};
> +
> +&osc {
> +	clock-frequency = <25000000>;
> +};
> +

> +&pinctrl {
> +	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>;
> +		};
> +	};
> +
> +	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>;
> +		};
> +	};
> +};

Small suggestion: please ensure the pinctrl is correct, different
board may require different configuration.

> +
> +&uart0 {
> +	pinctrl-0 = <&uart0_cfg>;
> +	pinctrl-names = "default";
> +	status = "okay";
> +	/delete-property/ resets;
> +};
> +
> +&sdhci0 {
> +	bus-width = <4>;
> +	no-1-8-v;
> +	no-mmc;
> +	no-sdio;
> +	disable-wp;
> +	pinctrl-0 = <&sdhci0_cfg>;
> +	pinctrl-names = "default";
> +	status = "okay";
> +};
> +
> -- 
> 2.51.0
> 

I suggest adding all the support devices instead of a minimum one.
Like ethernet, wifi, bluetooth.
In the next cycle, there should be a patch for adding USB device node,
as the driver is already merged. I also hope you can take it.

Regards,
Inochi

Re: [PATCH 2/2] arm64: dts: sophgo: add initial Milk-V Duo S board support

[Alexander Sverdlin]

Hi Inochi, Joshua,

On Tue, 2025-09-30 at 07:54 +0800, Inochi Amaoto wrote:
> > --- /dev/null
> > +++ b/arch/arm64/boot/dts/sophgo/sg2000-milkv-duo-s.dts
> > @@ -0,0 +1,88 @@
> > +// SPDX-License-Identifier: (GPL-2.0 OR MIT)
> > +
> > +/dts-v1/;
> > +
> > +#include <dt-bindings/pinctrl/pinctrl-sg2000.h>
> > +#include "sg2000.dtsi"
> > +
> > +/ {
> > +	model = "Milk-V DuoS";
> > +	compatible = "milkv,duo-s", "sophgo,sg2000";
> > +
> > +	aliases {
> > +		serial0 = &uart0;
> > +		mmc0 = &sdhci0;
> > +	};
> 
> It is better for adding gpio and other serial there?

I believe, gpio is long time discouraged here.

Link: https://lore.kernel.org/all/CACRpkdYErJH5RUjL+jPC5vnaqGiOqBwHsr0E42wOWrpBGrpS3w@mail.gmail.com/

-- 
Alexander Sverdlin.

Re: [PATCH 2/2] arm64: dts: sophgo: add initial Milk-V Duo S board support

[Inochi Amaoto]

On Tue, Sep 30, 2025 at 07:03:24AM +0200, Alexander Sverdlin wrote:
> Hi Inochi, Joshua,
> 
> On Tue, 2025-09-30 at 07:54 +0800, Inochi Amaoto wrote:
> > > --- /dev/null
> > > +++ b/arch/arm64/boot/dts/sophgo/sg2000-milkv-duo-s.dts
> > > @@ -0,0 +1,88 @@
> > > +// SPDX-License-Identifier: (GPL-2.0 OR MIT)
> > > +
> > > +/dts-v1/;
> > > +
> > > +#include <dt-bindings/pinctrl/pinctrl-sg2000.h>
> > > +#include "sg2000.dtsi"
> > > +
> > > +/ {
> > > +	model = "Milk-V DuoS";
> > > +	compatible = "milkv,duo-s", "sophgo,sg2000";
> > > +
> > > +	aliases {
> > > +		serial0 = &uart0;
> > > +		mmc0 = &sdhci0;
> > > +	};
> > 
> > It is better for adding gpio and other serial there?
> 
> I believe, gpio is long time discouraged here.
> 
> Link: https://lore.kernel.org/all/CACRpkdYErJH5RUjL+jPC5vnaqGiOqBwHsr0E42wOWrpBGrpS3w@mail.gmail.com/
> 

Good to know, let's drop it.

Regards,
Inochi

Re: [PATCH 2/2] arm64: dts: sophgo: add initial Milk-V Duo S board support

[Joshua Milas]

Hi Inochi,

> Small suggestion: please ensure the pinctrl is correct, different
> board may require different configuration.

Is there a certain way to do that? I have been checking it against
the board schematic [1]. It shows that it is using UART0 on the
pins defined in pinctrl-sg2000.h.

Link: https://github.com/milkv-duo/duo-files/blob/main/duo-s/hardware/duo_s_SCH_v1.1.pdf


> I suggest adding all the support devices instead of a minimum one.
> Like ethernet, wifi, bluetooth.
> In the next cycle, there should be a patch for adding USB device node,
> as the driver is already merged. I also hope you can take it.

Lets do it! I tried adding the following but could not get some items working:
* emmc from 'sg2000-milkv-duo-module-01.dtsi'
* sdhci1 from 'sg2000-milkv-duo-module-01.dtsi'
* mdio
* gmac0
* dmac
* saradc
* i2c*
* spi*

I pulled the following logs of interest:

---
...
[    0.647426] faux_driver regulatory: no of_node; not parsing pinctrl DT
...
[    0.732380] serial8250 serial8250: no of_node; not parsing pinctrl DT
...
[    2.418965] sophgo-cv1800-rtc cv1800b-rtc.0.auto: no of_node; not parsing pinctrl DT
[    2.427695] alarmtimer alarmtimer.1.auto: no of_node; not parsing pinctrl DT
...
[    2.441722] sophgo-cv1800-rtc cv1800b-rtc.0.auto: hctosys: unable to read the hardware clock
...
[    2.525580] SPI driver fb_st7789v has no spi_device_id for sitronix,st7789v
...
[    2.555363] faux_driver snd-soc-dummy: no of_node; not parsing pinctrl DT
...
[    2.767235] mmc1: Failed to initialize a non-removable card
...
[    2.900631] dw-apb-uart 4140000.serial: forbid DMA for kernel console
...
[   13.058020] stmmaceth 4070000.ethernet: IRQ eth_wake_irq not found
[   13.086915] stmmaceth 4070000.ethernet: IRQ eth_lpi not found
[   13.096993] stmmaceth 4070000.ethernet: IRQ sfty not found
[   13.105407] stmmaceth 4070000.ethernet: Hash table entries set to unexpected value 0
[   13.115751] stmmaceth 4070000.ethernet: dt configuration failed
[   13.127832] platform 3009800.mdio-mux: deferred probe pending: mdio-mux-mmioreg: failed to register mdio-mux bus /soc/mdio-mux@3009800
[   13.142739] platform 4070000.ethernet: deferred probe pending: (reason unknown)
[   13.152434] platform 4000000.i2c: deferred probe pending: (reason unknown)
[   13.161898] platform 4010000.i2c: deferred probe pending: (reason unknown)
[   13.171078] platform 4020000.i2c: deferred probe pending: (reason unknown)
[   13.180353] platform 4030000.i2c: deferred probe pending: (reason unknown)
[   13.189629] platform 4040000.i2c: deferred probe pending: (reason unknown)
[   13.198817] platform 3020000.gpio: deferred probe pending: gpio-dwapb: Cannot get reset descriptor
[   13.210208] platform 3021000.gpio: deferred probe pending: gpio-dwapb: Cannot get reset descriptor
[   13.221737] platform 3022000.gpio: deferred probe pending: gpio-dwapb: Cannot get reset descriptor
[   13.233111] platform 3023000.gpio: deferred probe pending: gpio-dwapb: Cannot get reset descriptor
[   13.244422] platform 4150000.serial: deferred probe pending: (reason unknown)
[   13.253971] platform 4160000.serial: deferred probe pending: (reason unknown)
[   13.263513] platform 4170000.serial: deferred probe pending: (reason unknown)
[   13.274037] platform 41c0000.serial: deferred probe pending: (reason unknown)
---

I believe I have the correct drivers enabled for everything. I'm figuring there
is some pinctrl configuration ('PIN_ETH_*'?) I have to add to the device tree
but unsure what it would look like.

Thanks for the feedback,
- Joshua Milas

Re: [PATCH 2/2] arm64: dts: sophgo: add initial Milk-V Duo S board support

[Joshua Milas]

Alexander,

> I wonder why is it necessary to remove "resets" at all, if it's
> exactly the SG2000 SoC. What is the exact problem with them?

When I dont have the 'resets' property removed I don't get any
output, with or without the pinctrl property. I found this out
by comparing the device tree from the released image from milk-v,
it was the only property missing.

- Joshua Milas

Re: [PATCH 2/2] arm64: dts: sophgo: add initial Milk-V Duo S board support

[Inochi Amaoto]

On Thu, Oct 02, 2025 at 09:11:14PM -0400, Joshua Milas wrote:
> Hi Inochi,
> 
> > Small suggestion: please ensure the pinctrl is correct, different
> > board may require different configuration.
> 
> Is there a certain way to do that? I have been checking it against
> the board schematic [1]. It shows that it is using UART0 on the
> pins defined in pinctrl-sg2000.h.
> 
> Link: https://github.com/milkv-duo/duo-files/blob/main/duo-s/hardware/duo_s_SCH_v1.1.pdf
> 
> 
> > I suggest adding all the support devices instead of a minimum one.
> > Like ethernet, wifi, bluetooth.
> > In the next cycle, there should be a patch for adding USB device node,
> > as the driver is already merged. I also hope you can take it.
> 
> Lets do it! I tried adding the following but could not get some items working:
> * emmc from 'sg2000-milkv-duo-module-01.dtsi'
> * sdhci1 from 'sg2000-milkv-duo-module-01.dtsi'
> * mdio
> * gmac0
> * dmac
> * saradc
> * i2c*
> * spi*
> 
> I pulled the following logs of interest:
> 
> ---
> ...
> [    0.647426] faux_driver regulatory: no of_node; not parsing pinctrl DT
> ...
> [    0.732380] serial8250 serial8250: no of_node; not parsing pinctrl DT
> ...
> [    2.418965] sophgo-cv1800-rtc cv1800b-rtc.0.auto: no of_node; not parsing pinctrl DT
> [    2.427695] alarmtimer alarmtimer.1.auto: no of_node; not parsing pinctrl DT
> ...
> [    2.441722] sophgo-cv1800-rtc cv1800b-rtc.0.auto: hctosys: unable to read the hardware clock
> ...
> [    2.525580] SPI driver fb_st7789v has no spi_device_id for sitronix,st7789v
> ...
> [    2.555363] faux_driver snd-soc-dummy: no of_node; not parsing pinctrl DT
> ...
> [    2.767235] mmc1: Failed to initialize a non-removable card
> ...
> [    2.900631] dw-apb-uart 4140000.serial: forbid DMA for kernel console
> ...
> [   13.058020] stmmaceth 4070000.ethernet: IRQ eth_wake_irq not found
> [   13.086915] stmmaceth 4070000.ethernet: IRQ eth_lpi not found
> [   13.096993] stmmaceth 4070000.ethernet: IRQ sfty not found
> [   13.105407] stmmaceth 4070000.ethernet: Hash table entries set to unexpected value 0
> [   13.115751] stmmaceth 4070000.ethernet: dt configuration failed
> [   13.127832] platform 3009800.mdio-mux: deferred probe pending: mdio-mux-mmioreg: failed to register mdio-mux bus /soc/mdio-mux@3009800
> [   13.142739] platform 4070000.ethernet: deferred probe pending: (reason unknown)
> [   13.152434] platform 4000000.i2c: deferred probe pending: (reason unknown)
> [   13.161898] platform 4010000.i2c: deferred probe pending: (reason unknown)
> [   13.171078] platform 4020000.i2c: deferred probe pending: (reason unknown)
> [   13.180353] platform 4030000.i2c: deferred probe pending: (reason unknown)
> [   13.189629] platform 4040000.i2c: deferred probe pending: (reason unknown)
> [   13.198817] platform 3020000.gpio: deferred probe pending: gpio-dwapb: Cannot get reset descriptor
> [   13.210208] platform 3021000.gpio: deferred probe pending: gpio-dwapb: Cannot get reset descriptor
> [   13.221737] platform 3022000.gpio: deferred probe pending: gpio-dwapb: Cannot get reset descriptor
> [   13.233111] platform 3023000.gpio: deferred probe pending: gpio-dwapb: Cannot get reset descriptor
> [   13.244422] platform 4150000.serial: deferred probe pending: (reason unknown)
> [   13.253971] platform 4160000.serial: deferred probe pending: (reason unknown)
> [   13.263513] platform 4170000.serial: deferred probe pending: (reason unknown)
> [   13.274037] platform 41c0000.serial: deferred probe pending: (reason unknown)
> ---
> 
> I believe I have the correct drivers enabled for everything. I'm figuring there
> is some pinctrl configuration ('PIN_ETH_*'?) I have to add to the device tree
> but unsure what it would look like.
> 

Weird, I don't see it in riscv build. Can you post your dts here?

Regards,
Inochi

Re: [PATCH 2/2] arm64: dts: sophgo: add initial Milk-V Duo S board support

[Inochi Amaoto]

On Thu, Oct 02, 2025 at 09:11:14PM -0400, Joshua Milas wrote:
> Hi Inochi,
> 
> > Small suggestion: please ensure the pinctrl is correct, different
> > board may require different configuration.
> 
> Is there a certain way to do that? I have been checking it against
> the board schematic [1]. It shows that it is using UART0 on the
> pins defined in pinctrl-sg2000.h.
> 
> Link: https://github.com/milkv-duo/duo-files/blob/main/duo-s/hardware/duo_s_SCH_v1.1.pdf
> 
> 

Sorry for missing this. A simple way is to dump the vendor configuration
for an example. It should show almost all you want to know. But if you
want to find the best, it is necessary to check the peripheral manual,
and it will tell the typical configuration.

Regards,
Inochi

Re: [PATCH 2/2] arm64: dts: sophgo: add initial Milk-V Duo S board support

[Joshua Milas]

Hi Alex,

> I believe, gpio is long time discouraged here.

Does this mean just the '&gpio*' entries, or other GPIO
items like i2c and spi?

Thanks,
- Joshua Milas

Re: [PATCH 2/2] arm64: dts: sophgo: add initial Milk-V Duo S board support

[Joshua Milas]

Inochi,

> Weird, I don't see it in riscv build. Can you post your dts here?

It ended up being a driver selection issue on my part. I got the
ARM64 and RICV both woring without the pinctrl config in the dts.
I was also able to get Ethernet working so V2 is hopefully a
maximal config.

Thanks,
- Joshua Milas

Re: [PATCH 2/2] arm64: dts: sophgo: add initial Milk-V Duo S board support

[Alexander Sverdlin]

On 9 October 2025 03:52:56 CEST, Joshua Milas <josh.milas@gmail.com> wrote:
>Hi Alex,
>
>> I believe, gpio is long time discouraged here.
>
>Does this mean just the '&gpio*' entries, or other GPIO
>items like i2c and spi?
>
>Thanks,
>- Joshua Milas

Hi!
I referred to "&gpio*" entries only being deprecated.