[PATCH v2 0/1] Enable hardware clock (RTC) on the Milk-V Pioneer

[PATCH v2 0/1] Enable hardware clock (RTC) on the Milk-V Pioneer

[Michael Orlitzky]

Add the DTS entries needed for the hardware clock on the Milk-V
Pioneer. I was able to get this working with an earlier (6.1.x) vendor
kernel, but it is disabled in the upstream DTS.

Changes in v2:
  - Trim extraneous information from the commit message
  - Link to v1: https://lore.kernel.org/sophgo/20260105120129.58895-1-michael@orlitzky.com

Michael Orlitzky (1):
  riscv: dts: sophgo: enable hardware clock (RTC) on the Milk-V Pioneer

 .../boot/dts/sophgo/sg2042-milkv-pioneer.dts  | 21 +++++++++++++++++++
 1 file changed, 21 insertions(+)

-- 
2.52.0


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

[Michael Orlitzky]

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@outlook.com>
Signed-off-by: Michael Orlitzky <michael@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@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)>,
-- 
2.52.0


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Re: [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@outlook.com>
> Signed-off-by: Michael Orlitzky <michael@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@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




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Re: [PATCH v2 0/1] Enable hardware clock (RTC) on the Milk-V Pioneer

[Inochi Amaoto]

On Wed, 07 Jan 2026 06:29:21 -0500, Michael Orlitzky wrote:
> Add the DTS entries needed for the hardware clock on the Milk-V
> Pioneer. I was able to get this working with an earlier (6.1.x) vendor
> kernel, but it is disabled in the upstream DTS.
> 
> Changes in v2:
>   - Trim extraneous information from the commit message
>   - Link to v1: https://lore.kernel.org/sophgo/20260105120129.58895-1-michael@orlitzky.com
> 
> [...]

Applied to dt/riscv, thanks!

[1/1] riscv: dts: sophgo: enable hardware clock (RTC) on the Milk-V Pioneer
      https://github.com/sophgo/linux/commit/9e81c522680db5998c872fb91ff7877cf3d8ff42

Thanks,
Inochi


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