linux-kernel - Re: [PATCH v6 0/3] Add USB role switch support to DWC2

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Date:   Thu, 24 Sep 2020 14:27:46 +0200
From:   Amelie DELAUNAY <amelie.delaunay@...com>
To:     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>,
        Alexandre TORGUE <alexandre.torgue@...com>
CC:     "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-stm32@...md-mailman.stormreply.com" 
        <linux-stm32@...md-mailman.stormreply.com>,
        Fabrice GASNIER <fabrice.gasnier@...com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Subject: Re: [PATCH v6 0/3] Add USB role switch support to DWC2

Gentle reminder on the whole series instead.

Thanks,
Amelie

On 9/9/20 11:35 AM, 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):
>    dt-bindings: usb: dwc2: add optional usb-role-switch property
>    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
> ---
> Changes in v6:
> - Select USB_ROLE_SWITCH if USB_DWC2, and not only if USB_DWC2_DUAL_ROLE:
>    drd.c is built whatever DWC2 mode (DUAL, HOST, PERIPHERAL) as it is used also
>    to detect attach/detach (so a-valid/b-valid sessions).
> Changes in v5:
> - Use device_property_read_bool instead of of_read_property_bool in params.c
> Changes in v4:
> - Simplify call to dwc2_force_mode in drd.c
> - Add error_drd label in probe error path in platform.c
> Changes in v3:
> - Fix build issue reported by kernel test robot in drd.c
> Changes in v2:
> - Previous DT patch already in stm32-next branch so removed from v2 patchset
>    "ARM: dts: stm32: enable usb-role-switch on USB OTG on stm32mp15xx-dkx"
> - DWC2 DT bindings update added
> - Build issue reported by kernel test robot fixed
> - Martin's comments taken into account
> ---
>   .../devicetree/bindings/usb/dwc2.yaml         |   4 +
>   drivers/usb/dwc2/Kconfig                      |   1 +
>   drivers/usb/dwc2/Makefile                     |   2 +-
>   drivers/usb/dwc2/core.h                       |   9 +
>   drivers/usb/dwc2/drd.c                        | 180 ++++++++++++++++++
>   drivers/usb/dwc2/gadget.c                     |   2 +-
>   drivers/usb/dwc2/params.c                     |   2 +-
>   drivers/usb/dwc2/platform.c                   |  20 +-
>   8 files changed, 215 insertions(+), 5 deletions(-)
>   create mode 100644 drivers/usb/dwc2/drd.c
>