[PATCH v8 10/10] arm64: dts: rockchip: rk3399-evb-ind: Add support for DisplayPort

[Chaoyi Chen]

On 10/29/2025 6:21 PM, Chaoyi Chen wrote:

> Hi Peter,
>
> On 10/29/2025 5:45 PM, Peter Chen wrote:
>>> +&i2c4 {
>>> +       i2c-scl-rising-time-ns = <475>;
>>> +       i2c-scl-falling-time-ns = <26>;
>>> +       status = "okay";
>>> +
>>> +       usbc0: typec-portc at 22 {
>>> +               compatible = "fcs,fusb302";
>>> +               reg = <0x22>;
>>> +               interrupt-parent = <&gpio1>;
>>> +               interrupts = <RK_PA2 IRQ_TYPE_LEVEL_LOW>;
>>> +               pinctrl-names = "default";
>>> +               pinctrl-0 = <&usbc0_int>;
>>> +               vbus-supply = <&vbus_typec>;
>>> +
>>> +               usb_con: connector {
>>> +                       compatible = "usb-c-connector";
>>> +                       label = "USB-C";
>>> +                       data-role = "dual";
>>> +                       power-role = "dual";
>>> +                       try-power-role = "sink";
>>> +                       op-sink-microwatt = <1000000>;
>>> +                       sink-pdos =
>>> +                               <PDO_FIXED(5000, 2500, PDO_FIXED_USB_COMM)>;
>>> +                       source-pdos =
>>> +                               <PDO_FIXED(5000, 1500, PDO_FIXED_USB_COMM)>;
>>> +
>>> +                       altmodes {
>>> +                               displayport {
>>> +                                       svid = /bits/ 16 <0xff01>;
>>> +                                       vdo = <0x00001c46>;
>>> +                               };
>>> +                       };
>>> +
>>> +                       ports {
>>> +                               #address-cells = <1>;
>>> +                               #size-cells = <0>;
>>> +
>>> +                               port at 0 {
>>> +                                       reg = <0>;
>>> +
>>> +                                       usbc_hs: endpoint {
>>> + remote-endpoint = <&u2phy0_typec_hs>;
>>> +                                       };
>>> +                               };
>>> +
>> Why USB2 PHY needs to be notified for Type-C connection?
>
> I think the USB-connector binding require a port at 0 for High Speed.  So I filled in USB2 PHY here. And I have looked up boards with the same usage, and some of the results are as follows:
>
> - rk3399-firefly.dts
>
> - rk3399-pinebook-pro.dts
>
> - rk3399-eaidk-610.dts
>
>
>>
>>> +                               port at 1 {
>>> +                                       reg = <1>;
>>> +
>>> +                                       usbc_ss: endpoint {
>>> + remote-endpoint = <&tcphy0_typec_ss>;
>>> +                                       };
>>> +                               };
>>> +
>>> +                               port at 2 {
>>> +                                       reg = <2>;
>>> +
>>> +                                       usbc_dp: endpoint {
>>> + remote-endpoint = <&tcphy0_typec_dp>;
>>> +                                       };
>>> +                               };
>>> +                       };
>>> +               };
>>> +       };
>>> +};
>>> +
>> .....
>>>   &u2phy0 {
>>>          status = "okay";
>>> +
>>> +       port {
>>> +               u2phy0_typec_hs: endpoint {
>>> +                       remote-endpoint = <&usbc_hs>;
>>> +               };
>>> +       };
>>>   };
>>>
>> There is no switch and mux, how to co-work with Type-C?
>
> I checked the phy-rockchip-inno-usb2.c but did not find any switch or mux. Does this mean that we need to implement them? Thank you.

Wait a minute, actually we have multiple hardware interfaces, one of which is Type-C, eventually connected to USBDPPHY, and the other is micro-usb connected to U2PHY.


>
>
>>
>> Best regards,
>> Peter
>>
>>
-- 
Best,
Chaoyi