linux-kernel - Re: [PATCH DNM v2 5/5] arm64: dts: qcom: qcs6490-radxa-dragon-q6a: Enable USB 3.0 and HDMI ports

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Message-ID: <CC5FA2116C20A69E+a2b123b5-1b78-444e-a886-3d3beb6e0ead@radxa.com>
Date: Mon, 15 Sep 2025 15:42:47 +0800
From: Xilin Wu <sophon@...xa.com>
To: Konrad Dybcio <konrad.dybcio@....qualcomm.com>,
 Bjorn Andersson <andersson@...nel.org>,
 Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, Neil Armstrong <neil.armstrong@...aro.org>,
 Viken Dadhaniya <viken.dadhaniya@....qualcomm.com>,
 Ram Kumar Dwivedi <quic_rdwivedi@...cinc.com>
Subject: Re: [PATCH DNM v2 5/5] arm64: dts: qcom: qcs6490-radxa-dragon-q6a:
 Enable USB 3.0 and HDMI ports

On 9/15/2025 3:27 PM, Konrad Dybcio wrote:
> On 9/14/25 5:57 PM, Xilin Wu wrote:
>> This board doesn't feature a regular Type-C port. The usb_1_qmpphy's
>> RX1/TX1 pair is statically connected to the USB-A port, while its RX0/TX0
>> pair is connected to the RA620 DP-to-HDMI bridge.
>>
>> Add and enable the nodes for the features to work.
>>
>> Signed-off-by: Xilin Wu <sophon@...xa.com>
>>
>> ---
>>
>> This change depends on the following patch series:
>> https://lore.kernel.org/all/20250908-topic-x1e80100-hdmi-v3-4-c53b0f2bc2fb@linaro.org/
>> ---
>>   .../boot/dts/qcom/qcs6490-radxa-dragon-q6a.dts     | 152 +++++++++++++++++++++
>>   1 file changed, 152 insertions(+)
>>
>> diff --git a/arch/arm64/boot/dts/qcom/qcs6490-radxa-dragon-q6a.dts b/arch/arm64/boot/dts/qcom/qcs6490-radxa-dragon-q6a.dts
>> index 3bf85d68c97891db1f1f0b84fb5649803948e06f..12bc9a0fcfbfeaabf6ede351f96c61193a8261c0 100644
>> --- a/arch/arm64/boot/dts/qcom/qcs6490-radxa-dragon-q6a.dts
>> +++ b/arch/arm64/boot/dts/qcom/qcs6490-radxa-dragon-q6a.dts
>> @@ -78,6 +78,71 @@ chosen {
>>   		stdout-path = "serial0:115200n8";
>>   	};
>>   
>> +	usb3_con: connector {
>> +		compatible = "usb-a-connector";
> 
> Looking at https://docs.radxa.com/en/dragon/q6a, I see two of these.
> 
> I suppose there's a (dumb) hub inbetween - check sdm850-lenovo-yoga-c630
> for reference if that's the case
> 
> Konrad
> 

There are actually four USB-A ports, but only one of them is USB 3.0, 
and is directly connected to the SoC.

The other three USB 2.0 ports are connected to an always-on USB hub, 
which is then connected to the second USB controller.

-- 
Best regards,
Xilin Wu <sophon@...xa.com>