Re: [PATCH v2] arm64: dts: qcom: hamoa-iot-evk: switch typec0 to PS8830 retimer

[Xin Liu <xin.liu@oss.qualcomm.com>]

On 8/18/2026 6:49 PM, Konrad Dybcio wrote:
> On 8/3/26 3:27 PM, Xin Liu wrote:
>> The Hamoa IoT EVK hardware design uses a Parade PS8830 retimer on
>> I2C3 for USB Type-C port 0. Describe the retimer and route typec0
>> through it to enable USB 3.0 SuperSpeed and DisplayPort Alt Mode.
>>
>> Supply the PS8830 from the existing vreg_rtmr0_* rails and remove
>> their stale "Left unused" annotation.
>>
>> The FSUSB42 SBU mux chip is present on the PCB but with all signal
>> lines unconnected (NC), so remove the fsusb42 node and its pinctrl
>> group.
> [...]
>
>> +&i2c3 {
>> +	clock-frequency = <400000>;
>> +	status = "okay";
>> +
>> +	typec-mux@8 {
>> +		compatible = "parade,ps8830";
>> +		reg = <0x08>;
>> +
>> +		clocks = <&rpmhcc RPMH_RF_CLK4>;
> On other boards, the port0 retimer normally takes RF_CLK3 - have
> you verified this bit?
>
> Konrad

Hi Konrad

Thanks for pointing this out.

I re-checked the schematic and confirmed that the Type-C0 retimer refclk
is provided by a board-level external XO/local XTAL, not by PMK/RPMH.
So RPMH_RF_CLK4 is not the correct clock source.

Since the binding requires a clock, I will model the board-level XO as a
fixed-clock and use it for the PS8830/PS8833 retimer node in v3.


Thanks,

XIN