Re: [PATCH] arm64: dts: rockchip: Add the GPU to Kobol Helios64

[Heiko Stuebner <heiko@sntech.de>]

Hi,

Am Samstag, 10. Oktober 2026, 23:53:01 Mitteleuropäische Normalzeit schrieb Igor Velkov via B4 Relay:
> From: Igor Velkov <iav@iav.lv>
> 
> The GPU core of Helios64 is supplied by U12, a Silergy SYR838 on i2c0
> at 0x41, with its VSEL pin on GPU_SLEEP_H (GPIO1_B6). Describe it as
> silergy,syr828, the way vdd_cpu_b (a SYR837) is described as
> silergy,syr827, and enable the GPU.
> 
> Assisted-by: LLM
> Signed-off-by: Igor Velkov <iav@iav.lv>
> ---
> Schematic, sheet 7:
> https://wiki.kobol.io/helios64/files/schematics/Helios64_Schematics_Rev1.2.pdf
> 
> Tested on mainline: panfrost probes, devfreq moves vdd_gpu from 825 mV
> at 200 MHz to 1100 mV at 800 MHz, glmark2-es2-wayland under headless
> weston scores 548-577 in three runs. Two of them logged one panfrost
> job timeout each; the Armbian DT gave none in three runs.
> ---
>  .../boot/dts/rockchip/rk3399-kobol-helios64.dts    | 28 ++++++++++++++++++++++
>  1 file changed, 28 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/rockchip/rk3399-kobol-helios64.dts b/arch/arm64/boot/dts/rockchip/rk3399-kobol-helios64.dts
> index 63ad79b4c8ac..1f50982291bf 100644
> --- a/arch/arm64/boot/dts/rockchip/rk3399-kobol-helios64.dts
> +++ b/arch/arm64/boot/dts/rockchip/rk3399-kobol-helios64.dts
> @@ -339,6 +339,11 @@ &gmac {
>  	status = "okay";
>  };
>  
> +&gpu {
> +	mali-supply = <&vdd_gpu>;
> +	status = "okay";
> +};
> +
>  &i2c0 {
>  	clock-frequency = <400000>;
>  	i2c-scl-rising-time-ns = <168>;
> @@ -453,6 +458,25 @@ regulator-state-mem {
>  			regulator-off-in-suspend;
>  		};
>  	};
> +
> +	vdd_gpu: regulator@41 {
> +		compatible = "silergy,syr828";
> +		reg = <0x41>;
> +		fcs,suspend-voltage-selector = <1>;
> +		pinctrl-names = "default";
> +		pinctrl-0 = <&vsel2_pin>;
> +		regulator-name = "vdd_gpu";
> +		regulator-always-on;
> +		regulator-boot-on;

both of these should not be needed, as the GPU should control its
regulator. (always-on and boot-on)

Heiko