[PATCH v2 2/2] riscv: dts: sophgo: Add Milk-V Duo 256M board support

[Inochi Amaoto]

On Thu, Jul 02, 2026 at 11:38:09AM +0800, Inochi Amaoto wrote:
> On Wed, Jun 10, 2026 at 08:10:10PM +0800, Chen-Yu Yeh wrote:
> > The Milk-V Duo 256M is a small form factor development board based on
> > the Sophgo SG2002 SoC.
> > 
> > This patch adds basic device tree support for the board, including:
> > - UART console
> > - SD/MMC controller
> > - USB host
> > - Onboard blue status LED (connected to PWR_GPIO[2] / porte 2)
> > 
> 
> > Tested on actual Milk-V Duo 256M hardware, verified boot to shell and
> > heartbeat LED functionality.
> > 
> 
> IIRC the led is not controlled by the small core, so the node should
> be described in the dts.
> 
> I see the Sashiko does provide some good question, please check.
> 
> > Signed-off-by: Chen-Yu Yeh <chenyou910331 at gmail.com>
> > ---
> > Changes since v1:
> > - Removed the leds node because &porte is not yet supported in cv180x.dtsi,
> >   which would cause a dtc compilation error.
> > - Retained the &usb node because it is already defined in cv180x.dtsi.
> > - Cleaned up the trailing blank line in the Makefile.
> > 


So why not adding the porte?

Regards,
Inochi

> >  arch/riscv/boot/dts/sophgo/Makefile           |   3 +-
> >  .../boot/dts/sophgo/sg2002-milkv-duo256m.dts  | 108 ++++++++++++++++++
> >  2 files changed, 110 insertions(+), 1 deletion(-)
> >  create mode 100644 arch/riscv/boot/dts/sophgo/sg2002-milkv-duo256m.dts
> > 
> > diff --git a/arch/riscv/boot/dts/sophgo/Makefile b/arch/riscv/boot/dts/sophgo/Makefile
> > index 6f65526d4193..f9415c30a2c5 100644
> > --- a/arch/riscv/boot/dts/sophgo/Makefile
> > +++ b/arch/riscv/boot/dts/sophgo/Makefile
> > @@ -2,7 +2,8 @@
> >  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-duo256m.dtb
> >  dtb-$(CONFIG_ARCH_SOPHGO) += sg2042-milkv-pioneer.dtb
> >  dtb-$(CONFIG_ARCH_SOPHGO) += sg2042-evb-v1.dtb
> >  dtb-$(CONFIG_ARCH_SOPHGO) += sg2042-evb-v2.dtb
> > -dtb-$(CONFIG_ARCH_SOPHGO) += sg2044-sophgo-srd3-10.dtb
> > +dtb-$(CONFIG_ARCH_SOPHGO) += sg2044-sophgo-srd3-10.dtb
> > \ No newline at end of file
> 
> 
> Why you change this? Please do not touch unrelated things.
> 
> > diff --git a/arch/riscv/boot/dts/sophgo/sg2002-milkv-duo256m.dts b/arch/riscv/boot/dts/sophgo/sg2002-milkv-duo256m.dts
> > new file mode 100644
> > index 000000000000..4cf441ab3790
> > --- /dev/null
> > +++ b/arch/riscv/boot/dts/sophgo/sg2002-milkv-duo256m.dts
> > @@ -0,0 +1,108 @@
> > +// SPDX-License-Identifier: (GPL-2.0 OR MIT)
> > +/*
> > + * Copyright (C) 2023 Jisheng Zhang <jszhang at kernel.org>
> 
> I guess a right copyright is needed for your code.
> 
> > + */
> > +
> > +/dts-v1/;
> > +
> > +#include "sg2002.dtsi"
> > +#include <dt-bindings/gpio/gpio.h>
> > +
> > +/ {
> > +	model = "Milk-V Duo 256M";
> > +	compatible = "milkv,duo256m", "sophgo,sg2002";
> > +
> > +	aliases {
> > +		serial0 = &uart0;
> > +		serial1 = &uart1;
> > +		serial2 = &uart2;
> > +		serial3 = &uart3;
> > +		serial4 = &uart4;
> > +	};
> > +
> > +	chosen {
> > +		stdout-path = "serial0:115200n8";
> > +	};
> > +
> > +	reserved-memory {
> > +		#address-cells = <1>;
> > +		#size-cells = <1>;
> > +		ranges;
> > +
> > +		coprocessor_rtos: region at 83f40000 {
> > +			reg = <0x83f40000 0xc0000>;
> > +			no-map;
> > +		};
> > +	};
> > +};
> > +
> > +&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";
> > +};
> > -- 
> > 2.43.0
> >