Re: [PATCH 8/8] riscv: dts: sophgo: add Milk-V Duo 256M board dts

[Inochi Amaoto <inochiama@gmail.com>]

On Thu, Jan 15, 2026 at 11:17:45PM +0400, Anton D. Stavinskii wrote:
> Example of usage internal dac/adc and external I2S mic
> The example shows how to use the card and
> will actually work other boards.
> Fixed clocks needed to make simple card make
> initial .set_sysclk with proper clock rates.
> Same for DAC. I2S3 has to be started not only
> for DAC but for the ADC also because it
> provides mclk for both.
> 
> dai-link@2 will only work if registers
> are set according to this issue
> https://github.com/sophgo/sophgo-doc/issues/174#event-21395297524
> in other case i2s2 will not output clocks and data.
> Those changes are not connected to the driver itself,
> but for another subsystem which is not yet ipmlemented.
> The following config properly works for MilkV Duo/256Mm, Module.
> Basically everything with sg2000/sg2002 but on some boards
> i2s2 output pins are soldered to Ethernet module.
> In Milk 256M they are free to use as external DAC/ADC.
> 
> Signed-off-by: Anton D. Stavinskii <stavinsky@gmail.com>
> ---
>  arch/riscv/boot/dts/sophgo/Makefile                |   1 +
>  .../boot/dts/sophgo/sg2002-milkv-duo-256m.dts      | 231 +++++++++++++++++++++
>  2 files changed, 232 insertions(+)
> 
> diff --git a/arch/riscv/boot/dts/sophgo/Makefile b/arch/riscv/boot/dts/sophgo/Makefile
> index 6f65526d4193..c8901ff680cb 100644
> --- a/arch/riscv/boot/dts/sophgo/Makefile
> +++ b/arch/riscv/boot/dts/sophgo/Makefile
> @@ -6,3 +6,4 @@ 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) += sg2002-milkv-duo-256m.dtb
> diff --git a/arch/riscv/boot/dts/sophgo/sg2002-milkv-duo-256m.dts b/arch/riscv/boot/dts/sophgo/sg2002-milkv-duo-256m.dts
> new file mode 100644
> index 000000000000..cc33c4355969
> --- /dev/null
> +++ b/arch/riscv/boot/dts/sophgo/sg2002-milkv-duo-256m.dts
> @@ -0,0 +1,231 @@
> +// SPDX-License-Identifier: (GPL-2.0 OR MIT)
> +/*
> + * Copyright (C) 2024 Thomas Bonnefille <thomas.bonnefille@bootlin.com>
> + */
> +
> +/dts-v1/;
> +
> +#include "sg2002.dtsi"
> +
> +/ {
> +	model = "Milk-V duo 256M";
> +	compatible = "milkv,duo-256m",
> +	"sipeed,licheerv-nano",
> +	"sophgo,sg2002";
> +
> +	aliases {
> +		gpio0 = &gpio0;
> +		gpio1 = &gpio1;
> +		gpio2 = &gpio2;
> +		gpio3 = &gpio3;
> +		serial0 = &uart0;
> +		serial1 = &uart1;
> +		serial2 = &uart2;
> +		serial3 = &uart3;
> +		serial4 = &uart4;
> +	};
> +
> +	chosen {
> +		stdout-path = "serial0:115200n8";
> +	};
> +};
> +
> +&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;
> +};
> +
> +&usb {
> +	dr_mode = "peripheral";
> +	status = "okay";
> +	g-rx-fifo-size = <1536>;
> +	g-tx-fifo-size = <128 128 64 64 64 64 32 32>;
> +};
> +
> +&uart0 {
> +	pinctrl-0 = <&uart0_cfg>;
> +	pinctrl-names = "default";
> +	status = "okay";
> +};
> +
> +&dmac {
> +	status = "okay";
> +};
> +
> +&dmamux {
> +	status = "okay";
> +};
> +
> +&pinctrl {
> +	i2s2_cfg: i2s2-cfg {
> +		i2s2-out-pins {
> +			pinmux = <PINMUX(PIN_ETH_TXM, 7)>,
> +			<PINMUX(PIN_ETH_RXP,  7)>,
> +			<PINMUX(PIN_ETH_RXM,  7)>;
> +
> +			drive-strength-microamp = <15700>;
> +			power-source = <1800>;
> +		};
> +
> +		i2s2-in-pins {
> +			pinmux = <PINMUX(PIN_ETH_TXP, 7)>;
> +			power-source = <1800>;
> +		};
> +	};
> +};
> +
> +&i2s0 {
> +	#sound-dai-cells = <0>;
> +	status = "okay";
> +};
> +
> +&i2s2 {
> +	pinctrl-0 = <&i2s2_cfg>;
> +	pinctrl-names = "default";
> +	#sound-dai-cells = <0>;
> +	status = "okay";
> +};
> +
> +&i2s3 {
> +	#sound-dai-cells = <0>;
> +	status = "okay";
> +};
> +
> +/ {

> +	int_adc: codec@300a100 {
> +		compatible = "sophgo,cv1800b-sound-adc";
> +		#sound-dai-cells = <0>;
> +		reg = <0x300a100 0x100>;
> +	};
> +
> +	int_dac: codec@300a000 {
> +		compatible = "sophgo,cv1800b-sound-dac";
> +		#sound-dai-cells = <0>;
> +		reg = <0x300a000 0x100>;
> +	};
> +

Move these two nodes into cv180x.dtsi, others are not allowed
in this patch series, use a separate patch instead.

Regards,
Inochi


> +	ext_adc: my-ext-adc {
> +		compatible = "invensense,ics43432";
> +		#sound-dai-cells = <0>;
> +	};
> +
> +	sound {
> +		compatible = "simple-audio-card";
> +		simple-audio-card,name = "cv1800b card";
> +		#address-cells = <1>;
> +		#size-cells = <0>;
> +
> +		simple-audio-card,dai-link@0 {
> +			reg = <0>;
> +			format = "i2s";
> +			bitclock-master = <&clock_master0>;
> +			frame-master = <&clock_master0>;
> +
> +			codec {
> +				sound-dai = <&int_dac>;
> +			};
> +
> +			clock_master0: cpu {
> +				system-clock-frequency = <12288000>;
> +				system-clock-fixed;
> +				system-clock-direction-out;
> +				mclk-fs = <256>;
> +				sound-dai = <&i2s3>;
> +			};
> +		};
> +
> +		simple-audio-card,dai-link@1 {
> +			reg = <1>;
> +			format = "i2s";
> +			bitclock-master = <&clock_master1>;
> +			frame-master = <&clock_master1>;
> +
> +			clock_master1: codec {
> +				mclk-fs = <256>;
> +				system-clock-frequency = <12288000>;
> +				system-clock-fixed;
> +				sound-dai = <&int_adc>;
> +			};
> +
> +			cpu {
> +				mclk-fs = <256>;
> +				system-clock-frequency = <12288000>;
> +				system-clock-fixed;
> +				sound-dai = <&i2s0>;
> +			};
> +		};
> +
> +		simple-audio-card,dai-link@2 {
> +			reg = <2>;
> +			format = "i2s";
> +			bitclock-master = <&clock_master2>;
> +			frame-master = <&clock_master2>;
> +
> +			codec {
> +				sound-dai = <&ext_adc>;
> +			};
> +
> +			clock_master2: cpu {
> +				mclk-fs = <256>;
> +				system-clock-frequency = <12288000>;
> +				system-clock-fixed;
> +				sound-dai = <&i2s2>;
> +			};
> +		};
> +	};
> +};
> 
> -- 
> 2.43.0
>