[PATCH v2 1/1] riscv: dts: sophgo: enable hardware clock (RTC) on the Milk-V Pioneer

[Chen Wang]

On 1/7/2026 7:29 PM, Michael Orlitzky wrote:
> These boards have a working hardware clock if you put a CR-1220
> battery in them. We enable it using information from a 6.1.x vendor
> kernel.
>
> Reviewed-by: Chen Wang <unicorn_wang at outlook.com>
> Signed-off-by: Michael Orlitzky <michael at orlitzky.com>
> ---
>   .../boot/dts/sophgo/sg2042-milkv-pioneer.dts  | 21 +++++++++++++++++++
>   1 file changed, 21 insertions(+)
>
> diff --git a/arch/riscv/boot/dts/sophgo/sg2042-milkv-pioneer.dts b/arch/riscv/boot/dts/sophgo/sg2042-milkv-pioneer.dts
> index 54d8386bf9c0..ecf8c1e29079 100644
> --- a/arch/riscv/boot/dts/sophgo/sg2042-milkv-pioneer.dts
> +++ b/arch/riscv/boot/dts/sophgo/sg2042-milkv-pioneer.dts
> @@ -52,6 +52,17 @@ &emmc {
>   	status = "okay";
>   };
>   
> +&i2c0 {
> +	pinctrl-0 = <&i2c0_cfg>;
> +	pinctrl-names = "default";
> +	status = "okay";
> +
> +	rtc: rtc at 68 {
> +		compatible = "dallas,ds1307";
> +		reg = <0x68>;
> +	};
> +};
> +
>   &i2c1 {
>   	pinctrl-0 = <&i2c1_cfg>;
>   	pinctrl-names = "default";
> @@ -89,6 +100,16 @@ sdhci-emmc-rst-pwr-pins {
>   		};
>   	};
>   
> +	i2c0_cfg: i2c0-cfg {
> +		i2c0-pins {
> +			pinmux = <PINMUX(PIN_IIC0_SDA, 0)>,
> +				 <PINMUX(PIN_IIC0_SCL, 0)>;
> +			bias-pull-up;
> +			drive-strength-microamp = <26800>;
> +			input-schmitt-enable;
> +		};
> +	};
> +
>   	i2c1_cfg: i2c1-cfg {
>   		i2c1-pins {
>   			pinmux = <PINMUX(PIN_IIC1_SDA, 0)>,

Tested based off 6.19-rc1 and passed.

Thanks,

Chen