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

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Message-ID: <20200616140717.28465-1-amelie.delaunay@st.com>
Date:   Tue, 16 Jun 2020 16:07:14 +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>, <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>,
        Amelie Delaunay <amelie.delaunay@...com>
Subject: [PATCH 0/3] Add USB role switch support to DWC2

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

-- 
2.17.1