linux-kernel - Re: [PATCH RFC] arm64: dts: qcom: qcs6490-rb3gen2: power on onboard uPD720201 controller

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Message-ID: <mrby2lcn6y2igm4qljzv47vbc4xxuxyqc2kyrzvxjtxbwapf64@ulmbbxi7kudg>
Date: Thu, 15 Jan 2026 03:28:05 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Cc: 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>, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC] arm64: dts: qcom: qcs6490-rb3gen2: power on onboard
 uPD720201 controller

On Tue, Jan 13, 2026 at 04:00:02PM +0100, Konrad Dybcio wrote:
> On 1/9/26 4:30 PM, Dmitry Baryshkov wrote:
> > One of ports of the TC9563 bridge is connected to the PCIe Renesas host
> > controller. Specify the voltage regulator, powering on the USB host
> > controller.
> > 
> > Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
> > ---
> > Note, with these changes I can't get the onboard hub / ASIX controller
> > to work. Most likely those need to be powered on separately, but my
> > quick attempts to do it failed up to now.
> > ---
> 
> I assume it's connected to the switch?
> 
> Does it show up on the bus? What if if you rescan the bus manually?

I probably wasn't clear enough. The Renesas PCIe xHCI (placed on the
interposer) works with this patch, but I can not the USB hub and the
ASIX net controller (both a part of the main board) to show up on the
USB bus.

-- 
With best wishes
Dmitry