netdev - Re: [PATCH v5 08/10] arm64: dts: qcom: lemans-evk: Enable first USB controller in device mode

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Message-ID: <nz2dsvc6qyz47dxfbj4deo5xttnegv2qmueo4k5mhrvnkqh3oo@ddakv5hphfw3>
Date: Tue, 16 Sep 2025 14:01:56 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Wasim Nazir <wasim.nazir@....qualcomm.com>
Cc: Ulf Hansson <ulf.hansson@...aro.org>, 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>,
        Richard Cochran <richardcochran@...il.com>,
        Bartosz Golaszewski <brgl@...ev.pl>, kernel@....qualcomm.com,
        linux-mmc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        netdev@...r.kernel.org, linux-i2c@...r.kernel.org,
        Krishna Kurapati <krishna.kurapati@....qualcomm.com>,
        Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Subject: Re: [PATCH v5 08/10] arm64: dts: qcom: lemans-evk: Enable first USB
 controller in device mode

On Tue, Sep 16, 2025 at 04:16:56PM +0530, Wasim Nazir wrote:
> From: Krishna Kurapati <krishna.kurapati@....qualcomm.com>
> 
> Enable the first USB controller in device mode on the Lemans EVK
> board and configure the associated LDO regulators to power
> the PHYs accordingly.
> 
> The USB port is a Type-C port controlled by HD3SS3320 port controller.
> The role switch notifications would need to be routed to glue driver by
> adding an appropriate usb-c-connector node in DT. However in the design,
> the vbus supply that is to be provided to connected peripherals when
> port is configured as an DFP, is controlled by a GPIO.
> 
> There is also one ID line going from Port controller chip to GPIO-50 of
> the SoC. As per the datasheet of HD3SS3320:
> 
> "Upon detecting a UFP device, HD3SS3220 will keep ID pin high if VBUS is
> not at VSafe0V. Once VBUS is at VSafe0V, the HD3SS3220 will assert ID
> pin low. This is done to enforce Type-C requirement that VBUS must be
> at VSafe0V before re-enabling VBUS."
> 
> The current HD3SS3220 driver doesn't have this functionality present. So,
> putting the first USB controller in device mode for now. Once the vbus
> control based on ID pin is implemented in hd3ss3220.c, the
> usb-c-connector will be implemented and dr mode would be made OTG.
> 
> Signed-off-by: Krishna Kurapati <krishna.kurapati@....qualcomm.com>
> Reviewed-by: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
> Signed-off-by: Wasim Nazir <wasim.nazir@....qualcomm.com>
> ---
>  arch/arm64/boot/dts/qcom/lemans-evk.dts | 23 +++++++++++++++++++++++
>  1 file changed, 23 insertions(+)
> 

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>


-- 
With best wishes
Dmitry