[PATCH] arm64: dts: rockchip: enable SD UHS-I on Firefly-RK3399

[Shawn Lin]

在 2026/09/22 星期二 13:50, Yaozhong Li 写道:
> The SD slot on this board stays at 50 MHz with 3.3V signalling. The

...

> 
> I have no schematic for this board. The claim about what LDO4 feeds
> rests on the vendor firmware device tree plus the measurements above.
> 

It's easy to find one:
https://github.com/armbian/armbian.github.io/blob/main/board-schematics/firefly-rk3399.pdf

Too bad it was designed this way! What if sdio-wifi is working on UHS
modebut people insert a HighSpeed only sd card?

> The analysis and the commit message were drafted with the help of an
> LLM-based assistant (Claude Code), cross-reviewed with a second one
> (OpenAI Codex). The device tree change, the measurements and the final
> wording are mine.
> 
>   arch/arm64/boot/dts/rockchip/rk3399-firefly.dts | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/boot/dts/rockchip/rk3399-firefly.dts b/arch/arm64/boot/dts/rockchip/rk3399-firefly.dts
> index 0568dfa..7cabbc1 100644
> --- a/arch/arm64/boot/dts/rockchip/rk3399-firefly.dts
> +++ b/arch/arm64/boot/dts/rockchip/rk3399-firefly.dts
> @@ -777,7 +777,6 @@ &sdio0 {
>   
>   	/* Power supply */
>   	vqmmc-supply = <&vcc1v8_s3>;	/* IO line */
> -	vmmc-supply = <&vcc_sdio>;	/* card's power */
>   
>   	#address-cells = <1>;
>   	#size-cells = <0>;
> @@ -804,6 +803,8 @@ &sdmmc {
>   	max-frequency = <150000000>;
>   	pinctrl-names = "default";
>   	pinctrl-0 = <&sdmmc_clk &sdmmc_cmd &sdmmc_bus4>;
> +	sd-uhs-sdr104;
> +	vqmmc-supply = <&vcc_sdio>;
>   	status = "okay";
>   };
>   
> 
> base-commit: 940de590b839f71d6dc846160534bf202401b8b7