linux-kernel - Re: [PATCH v3] usb: dwc3: qcom: Remove extcon functionality from glue

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Message-ID: <h4gvc73zp5csthn6fk3upj45xbtlijove67gigfgrvzi6gwu3k@y6v4lggyqf2u>
Date: Mon, 14 Jul 2025 12:24:05 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Krishna Kurapati <krishna.kurapati@....qualcomm.com>
Cc: Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Bjorn Andersson <bjorn.andersson@....qualcomm.com>,
        linux-arm-msm@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] usb: dwc3: qcom: Remove extcon functionality from glue

On Mon, Jul 14, 2025 at 10:17:02AM +0530, Krishna Kurapati wrote:
> Deprecate usage of extcon functionality from the glue driver. Now
> that the glue driver is a flattened implementation, all existing
> DTs would eventually move to new bindings. While doing so let them
> make use of role-switch/ typec frameworks to provide role data
> rather than using extcon.
> 
> On upstream, summary of targets/platforms using extcon is as follows:
> 
> 1. MSM8916 and MSM8939 use Chipidea controller, hence the changes have no
> effect on them.
> 
> 2. Of the other extcon users, most of them use "linux,extcon-usb-gpio"
> driver which relies on id/vbus gpios to inform role changes. This can be
> transitioned to role switch based driver (usb-conn-gpio) while flattening
> those platforms to move away from extcon and rely on role
> switching.
> 
> 3. The one target that uses dwc3 controller and extcon and is not based
> on reading gpios is "arch/arm64/boot/dts/qcom/msm8996-xiaomi-common.dtsi".
> This platform uses TI chip to provide extcon. If usb on this platform is
> being flattneed, then effort should be put in to define a usb-c-connector
> device in DT and make use of role switch functionality in TUSB320L driver.
> 
> Signed-off-by: Krishna Kurapati <krishna.kurapati@....qualcomm.com>
> ---
> Changes in v3:
> This change was 4rth patch in [1]. It was suggested to make this as the
> first patch of the series. Since this is independent of role switch
> patches, sending this out separately. Removed RB Tag of Dmitry since the
> patch has been changed.
> 
> [1]: https://lore.kernel.org/all/20250610091357.2983085-1-krishna.kurapati@oss.qualcomm.com/
> 
>  drivers/usb/dwc3/dwc3-qcom.c | 90 +-----------------------------------
>  1 file changed, 1 insertion(+), 89 deletions(-)
> 

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


-- 
With best wishes
Dmitry