linux-kernel - Re: [PATCH 0/3] Add USB role switch support to DWC2

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Message-ID: <d8069a78-2640-d112-a2fb-d86b99a8e44f@st.com>
Date:   Tue, 21 Jul 2020 10:54:42 +0200
From:   Alexandre Torgue <alexandre.torgue@...com>
To:     Amelie Delaunay <amelie.delaunay@...com>,
        Minas Harutyunyan <hminas@...opsys.com>,
        Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>
CC:     <linux-usb@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        Fabrice Gasnier <fabrice.gasnier@...com>
Subject: Re: [PATCH 0/3] Add USB role switch support to DWC2

Hi Amélie

On 6/16/20 4:07 PM, Amelie Delaunay wrote:
> When using usb-c connector (but it can also be the case with a micro-b
> connector), iddig, avalid, bvalid, vbusvalid input signals may not be
> connected to the DWC2 OTG controller.
> DWC2 OTG controller features an overriding control of the PHY voltage valid
> and ID input signals.
> So, missing signals can be forced using usb role from usb role switch and
> this override feature.
> 
> This series adds support for usb role switch to dwc2, by using overriding
> control of the PHY voltage valid and ID input signals.
> 
> It has been tested on stm32mp157c-dk2 [1], which has a Type-C connector
> managed by a Type-C port controller, and connected to USB OTG controller.
> 
> [1] https://www.st.com/en/evaluation-tools/stm32mp157c-dk2.html
> 
> Amelie Delaunay (3):
>    usb: dwc2: override PHY input signals with usb role switch support
>    usb: dwc2: don't use ID/Vbus detection if usb-role-switch on STM32MP15
>      SoCs
>    ARM: dts: stm32: enable usb-role-switch on USB OTG on stm32mp15xx-dkx
> 
>   arch/arm/boot/dts/stm32mp15xx-dkx.dtsi |   2 +-
>   drivers/usb/dwc2/Kconfig               |   1 +
>   drivers/usb/dwc2/Makefile              |   2 +-
>   drivers/usb/dwc2/core.h                |   8 ++
>   drivers/usb/dwc2/drd.c                 | 190 +++++++++++++++++++++++++
>   drivers/usb/dwc2/gadget.c              |   2 +-
>   drivers/usb/dwc2/params.c              |   4 +-
>   drivers/usb/dwc2/platform.c            |  13 ++
>   8 files changed, 218 insertions(+), 4 deletions(-)
>   create mode 100644 drivers/usb/dwc2/drd.c
> 

DT patch applied on stm32-next.

Thanks
Alex