linux-kernel - Re: [PATCH v2] arm64: dts: qcom: hamoa-iot-evk: Add vbus regulator support for Type-A ports

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Message-ID: <j62ntbrmol7qjqcuey3har3d74gqt573ew67w7nrnnhv3pzrnj@hptvrfbeaobs>
Date: Tue, 9 Dec 2025 17:19:25 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Krishna Kurapati <krishna.kurapati@....qualcomm.com>
Cc: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Subject: Re: [PATCH v2] arm64: dts: qcom: hamoa-iot-evk: Add vbus regulator
 support for Type-A ports

On Tue, Dec 09, 2025 at 01:31:10PM +0530, Krishna Kurapati wrote:
> 
> 
> On 12/9/2025 1:22 PM, Dmitry Baryshkov wrote:
> > On Tue, Dec 09, 2025 at 09:47:01AM +0530, Krishna Kurapati wrote:
> > > The Multiport controller on Hamoa EVK platform is connected to Two Type-A
> > > ports. VBUS for each of these ports are provided by a TPS2559QWDRCTQ1
> > > regulator, controlled from PMIC GPIOs.
> > > 
> > > Add the necessary regulators and GPIO configuration to power these.
> > 
> > Should this also include corresponding USB-A connector devices? See
> > qcs6490-radxa-dragon-q6a.dts for the example of how to describe them.
> > 
> 
> Hi Dmitry,
> 
>  I see same discussion that came up when we were trying to upstream TypeA
> connectors of SA8295:
> 	
> https://lore.kernel.org/all/CAA8EJppf+j6H8vPOrer1Oj6SuM=qHKXoBahtCaCr7an-cbpyOQ@mail.gmail.com/
> 
> There is no entity (either phy or dwc3) as of today that can read the vbus
> from connector-A node and use it. So keeping these regulators always on for
> now.

There are two distinct questions:
- one is how you describe the board and onboard devices / connectors
- another one is how to make sure VBus is enabled.

I'd suggest having full description (with connectors, graph links
between USB host and connector and vbus-supply properties) and then
having the comment before regulator-always-on describing why it's on.

> 
> Regards,
> Krishna,
> 
> > > 
> > > Reviewed-by: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
> > > Signed-off-by: Krishna Kurapati <krishna.kurapati@....qualcomm.com>
> > > ---
> > > Changes in v2:
> > > - Re-ordered nodes to be in sorted order.
> > > 
> > > Link to v1:
> > > https://lore.kernel.org/all/20251208085152.2597818-1-krishna.kurapati@oss.qualcomm.com/
> > > 
> > >   arch/arm64/boot/dts/qcom/hamoa-iot-evk.dts | 37 ++++++++++++++++++++++
> > >   1 file changed, 37 insertions(+)
> > > 
> > 
> 

-- 
With best wishes
Dmitry