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Subject: Re: [PATCH 0/3] Add USB role switch support to DWC2
To:     Alexandre Torgue <alexandre.torgue@st.com>,
        Felipe Balbi <balbi@kernel.org>,
        Maxime Coquelin <mcoquelin.stm32@gmail.com>
CC:     Minas Harutyunyan <hminas@synopsys.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Rob Herring <robh+dt@kernel.org>, <linux-usb@vger.kernel.org>,
        <devicetree@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        <linux-arm-kernel@lists.infradead.org>,
        <linux-stm32@st-md-mailman.stormreply.com>,
        Fabrice Gasnier <fabrice.gasnier@st.com>
References: <20200616140717.28465-1-amelie.delaunay@st.com>
 <d8069a78-2640-d112-a2fb-d86b99a8e44f@st.com>
From:   Amelie DELAUNAY <amelie.delaunay@st.com>
Message-ID: <97cd44c1-9e19-94bc-54f8-204d79b79975@st.com>
Date:   Fri, 24 Jul 2020 14:57:05 +0200
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Hi Felipe,

I saw that you took DT patch (ARM: dts: stm32: enable usb-role-switch on 
USB OTG on stm32mp15xx-dkx) in your next branch. As it was already in
Alex' stm32-next branch, a potential merge conflict could occurred.

Regards,
Amelie

On 7/21/20 10:54 AM, Alexandre Torgue wrote:
> 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