linux-kernel - [RFC 00/19] dwc3: add USB OTG role switch support

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Date:	Wed, 18 Mar 2015 15:04:05 +0100
From:	Robert Baldyga <r.baldyga@...sung.com>
To:	balbi@...com
Cc:	gregkh@...uxfoundation.org, myungjoo.ham@...sung.com,
	cw00.choi@...sung.com, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, m.szyprowski@...sung.com,
	Robert Baldyga <r.baldyga@...sung.com>
Subject: [RFC 00/19] dwc3: add USB OTG role switch support

Hello,

This patchset introduces OTG feature in DWC3 DRD driver. This allows
to change dynamically between host and peripheral mode depending on
detected USB cable type.

DWC3 driver behaviour is changed only in situation when selected operation
mode (dr_mode) is "otg", and hardware OTG support is available or extended
OTG operations are supplied for given platform.

It such conditions are fulfilled, none of modes is enabled by default
and dwc3 core Best regards,
Robert Baldygais being uninitialized. After USB cable detection relevant
mode is selected and dwc3 core is initialized. Cable disconnection causes
deinitialization of dwc3 core.

File otg.c is inspired by code of DWC3 driver from Hardkernel linux
sources [1]. I have never tested it on DWC3 version equipped with hardware
OTG support, but I belive that this code have chance to work or at least
it's easy to fix. I have tested this on OdroidXU3 board which has USB
cable detection mechanism based on two gpio pins. I used extcon driver
for those feature, which is also attached to following patchset.

I consider if ext_otg_ops it the right solution. Current solution is
based on Hardkernel sources, but it's very likely that adding extcon
support directly to otg.c would be generic enough, as most of cable
detection mechanisms can be simply represented by extcon devices.

Thanks in advance for your comments.

Best regards,
Robert Baldyga

[1] https://github.com/hardkernel/linux

Robert Baldyga (19):
  extcon: add extcon-odroid-usbotg driver
  dt-bindings: extcon: Add doc for extcon-odroid-usbotg
  ARM: dts: exynos5422-odroidxu3: add odroid-usbotg extcon support
  dwc3: gadget: add VBUS session handling
  dwc3: gadget: enable/disable ep0 in dwc3_gadget_run_stop()
  dwc3: gadget: check returned value in suspend/resume
  dwc3: core: cleanup suspend/resume code
  dwc3: core: handle event buffers in core_init/exit
  dwc3: core: make dwc3_core_init/exit non-static
  dwc3: add missing OTG register definitions
  dwc3: add OTG handling code
  dwc3: otg: add ext_otg_ops support
  dwc3: gadget: register gadget in OTG core
  dwc3: host: don't add XHCI device only if in OTG mode
  dwc3: core: initialize OTG in DWC3 core
  dwc3: exynos: add software role switching code
  ARM: dts: exynos5420: set usb3_lpm_capable in dwc3 controllers
  ARM: dts: exynos5420: add snps,dis_u3_susphy_quirk to dwc3 controllers
  ARM: dts: exynos5422-odroidxu3: make usbdrd3 extcon client

 .../bindings/extcon/extcon-odroid-usbotg.txt       |  16 +
 .../devicetree/bindings/usb/exynos-usb.txt         |   4 +
 arch/arm/boot/dts/exynos5420.dtsi                  |   6 +
 arch/arm/boot/dts/exynos5422-odroidxu3.dts         |  24 +
 drivers/extcon/Kconfig                             |   4 +
 drivers/extcon/Makefile                            |   1 +
 drivers/extcon/extcon-odroid-usbotg.c              | 257 +++++++++
 drivers/usb/dwc3/Kconfig                           |   1 +
 drivers/usb/dwc3/Makefile                          |   4 +
 drivers/usb/dwc3/core.c                            |  66 ++-
 drivers/usb/dwc3/core.h                            |  22 +
 drivers/usb/dwc3/dwc3-exynos.c                     | 162 ++++++
 drivers/usb/dwc3/gadget.c                          | 106 ++--
 drivers/usb/dwc3/host.c                            |  10 +-
 drivers/usb/dwc3/otg.c                             | 577 +++++++++++++++++++++
 drivers/usb/dwc3/otg.h                             | 113 ++++
 16 files changed, 1320 insertions(+), 53 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/extcon/extcon-odroid-usbotg.txt
 create mode 100644 drivers/extcon/extcon-odroid-usbotg.c
 create mode 100644 drivers/usb/dwc3/otg.c
 create mode 100644 drivers/usb/dwc3/otg.h

-- 
1.9.1

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