The Khadas VIM1S board has an on-board Haoyu Micro HYM8563 Real Time
Clock (RTC) connected to the I2C1 bus.

Enable the I2C1 controller and add the RTC child node to support
hardware clock persistence.

Signed-off-by: Nick Xie <nick@khadas.com>
---
 .../dts/amlogic/meson-s4-s905y4-khadas-vim1s.dts  | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/arch/arm64/boot/dts/amlogic/meson-s4-s905y4-khadas-vim1s.dts b/arch/arm64/boot/dts/amlogic/meson-s4-s905y4-khadas-vim1s.dts
index 792ab45c4c944..7314e0ab81da3 100644
--- a/arch/arm64/boot/dts/amlogic/meson-s4-s905y4-khadas-vim1s.dts
+++ b/arch/arm64/boot/dts/amlogic/meson-s4-s905y4-khadas-vim1s.dts
@@ -20,6 +20,8 @@ aliases {
 		mmc0 = &emmc; /* eMMC */
 		mmc1 = &sd; /* SD card */
 		mmc2 = &sdio; /* SDIO */
+		rtc0 = &rtc;
+		rtc1 = &vrtc;
 		serial0 = &uart_b;
 	};
 
@@ -223,6 +225,19 @@ &ethmac {
 	phy-mode = "rmii";
 };
 
+&i2c1 {
+	status = "okay";
+	pinctrl-names = "default";
+	pinctrl-0 = <&i2c1_pins2>;
+	clock-frequency = <100000>;
+
+	rtc: rtc@51 {
+		compatible = "haoyu,hym8563";
+		reg = <0x51>;
+		#clock-cells = <0>;
+	};
+};
+
 &ir {
 	status = "okay";
 	pinctrl-0 = <&remote_pins>;
-- 
2.34.1

On 3/27/26 10:30, Nick Xie wrote:
> The Khadas VIM1S board has an on-board Haoyu Micro HYM8563 Real Time
> Clock (RTC) connected to the I2C1 bus.
> 
> Enable the I2C1 controller and add the RTC child node to support
> hardware clock persistence.
> 
> Signed-off-by: Nick Xie <nick@khadas.com>
> ---
>   .../dts/amlogic/meson-s4-s905y4-khadas-vim1s.dts  | 15 +++++++++++++++
>   1 file changed, 15 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/amlogic/meson-s4-s905y4-khadas-vim1s.dts b/arch/arm64/boot/dts/amlogic/meson-s4-s905y4-khadas-vim1s.dts
> index 792ab45c4c944..7314e0ab81da3 100644
> --- a/arch/arm64/boot/dts/amlogic/meson-s4-s905y4-khadas-vim1s.dts
> +++ b/arch/arm64/boot/dts/amlogic/meson-s4-s905y4-khadas-vim1s.dts
> @@ -20,6 +20,8 @@ aliases {
>   		mmc0 = &emmc; /* eMMC */
>   		mmc1 = &sd; /* SD card */
>   		mmc2 = &sdio; /* SDIO */
> +		rtc0 = &rtc;
> +		rtc1 = &vrtc;
>   		serial0 = &uart_b;
>   	};
>   
> @@ -223,6 +225,19 @@ &ethmac {
>   	phy-mode = "rmii";
>   };
>   
> +&i2c1 {
> +	status = "okay";
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&i2c1_pins2>;
> +	clock-frequency = <100000>;
> +
> +	rtc: rtc@51 {
> +		compatible = "haoyu,hym8563";
> +		reg = <0x51>;
> +		#clock-cells = <0>;
> +	};
> +};
> +
>   &ir {
>   	status = "okay";
>   	pinctrl-0 = <&remote_pins>;

Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>

Thanks,
Neil