Re: [PATCH] arm64: dts: rockchip: Describe the Type-C port on RK3576 EVB1

[Chaoyi Chen <chaoyi.chen@rock-chips.com>]

Hi Alexey,

On 11/11/2026 6:45 PM, Alexey Charkov wrote:
> Hi Chaoyi,
> 
> On Wed, Nov 11, 2026 at 1:31 PM Chaoyi Chen <chaoyi.chen@rock-chips.com> wrote:
>>
>> Hi Alexey,
>>
>> On 11/7/2026 1:52 AM, Alexey Charkov wrote:
>>> RK3576 EVB1 has its USBDP PHY routed to a Type-C port with a HUSB311 CC
>>> controller and a fixed-voltage VBUS supply.
>>>
>>> Describe it in the device tree, including the wiring for both the USB and
>>> the DP side.
>>>
>>> This makes the data roles follow the Type-C port's negotiation, so the
>>> port stops being host only. It also leaves the VBUS regulator to be
>>> managed by TCPM instead of being hardwired via the tangentially related
>>> phy-supply on a USB controller. DP lanes are also muxed dynamically by
>>> the USBDP PHY based on the Type-C port's negotiation, so the hacky fixed
>>> lane muxing also goes away.
>>>
>>
>> Have you tested this? As far as I know, dw-dp driver does not support
>> Type-C HPD yet.
> 
> I did - it works fine for me under Linux with Sebastian's patches. My
> primary motivation, however, was U-Boot, where the current phy-supply
> hack breaks USB data role switching, due to VBUS being forced
> always-on. With this patch it works, and now the DT actually describes
> the hardware, as it is supposed to.
> 

Oh, I almost forgot about that. I think it should be this patch series[0], right?

But I think we probably need more than just this series, because
richtek,rt1711h does not register the HPD bridge, so we will get this:

[   14.828983] auxiliary aux_bridge.aux_bridge.0: deferred probe pending: aux_bridge.aux_bridge: failed to acquire drm_bridge

Maybe you have already added the corresponding patch yourself?
Another option is to use the generic AUX HPD patch[1]. :)

[0]: https://lore.kernel.org/linux-rockchip/20260806-synopsys-dw-dp-improvements-v11-0-0d508505f383@collabora.com/
[1]: https://lore.kernel.org/all/20261020072816.180-1-kernel@airkyi.com/

-- 
Best, 
Chaoyi