Re: [PATCH v1 2/3] arm64: dts: rockchip: rk3588-rock-5b-5bp-5t: Fix USB host phy-supply on Rock 5b-5bp-5t SbC

[Sebastian Reichel]

Hi,

On Sat, Jan 03, 2026 at 02:01:18PM +0530, Anand Moon wrote:
> The USB host USB2 and USB3 on the Rock 5B, 5BP, and 5T is powered by the
> USB_HOST_PWREN_H gpio pin which is used to enable vcc5v0_host host
> regulator which ensures proper power sequencing and management for onboard
> Double-USB-HOST.
> 
> Update the u2phy2_host node to reference the correct phy-supply.
> 
> Cc: Sebastian Reichel <sebastian.reichel@xxxxxxxxxxxxx>
> Signed-off-by: Anand Moon <linux.amoon@xxxxxxxxx>
> ---

u2phy2_host is connected to an onboard USB hub chip, which is
powered by &vcc5v0_sys as the comment says.

You can see this on page 9 of the v1.45 ROCK 5B schematics (page
name USB2HUB). The usb hub chip uses VCC5V0_SYS + VCC_3V3_S0 and is
connected to USB20_HOST0_DP, USB20_HOST0_DM. The related USB
controller for that in the upstream DT is &usb_host0_ehci, which
in turn is using &u2phy2_host. Thus at least for the ROCK 5B the
existing DT is correct. Properly describing the downstream port
VBUS regulator would require something like the following series:

https://lore.kernel.org/all/20250911-v6-16-topic-usb-onboard-dev-v4-0-1af288125d74@xxxxxxxxxxxxxx/

Greetings,

-- Sebastian

>  arch/arm64/boot/dts/rockchip/rk3588-rock-5b-5bp-5t.dtsi | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/rockchip/rk3588-rock-5b-5bp-5t.dtsi b/arch/arm64/boot/dts/rockchip/rk3588-rock-5b-5bp-5t.dtsi
> index 0cd8ac7bf538..886d788572fc 100644
> --- a/arch/arm64/boot/dts/rockchip/rk3588-rock-5b-5bp-5t.dtsi
> +++ b/arch/arm64/boot/dts/rockchip/rk3588-rock-5b-5bp-5t.dtsi
> @@ -981,8 +981,7 @@ &u2phy2 {
>  };
>  
>  &u2phy2_host {
> -	/* connected to USB hub, which is powered by vcc5v0_sys */
> -	phy-supply = <&vcc5v0_sys>;
> +	phy-supply = <&vcc5v0_host>;
>  	status = "okay";
>  };
>  
> -- 
> 2.50.1
>

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