Re: [RFC 00/19] dwc3: add USB OTG role switch support

From: Chanwoo Choi
Date: Wed Mar 18 2015 - 22:34:25 EST


Hi Robert,

Did you test the extcon-odroid-otg driver on Odroid-U3?

Thanks,
Chanwoo Choi

On 03/18/2015 11:04 PM, Robert Baldyga wrote:
> 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
>

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