linux-kernel - [RFC][PATCH 0/3 v2] Try to connect HiKey's usb extcon to dwc2 driver

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Date:   Tue,  6 Dec 2016 00:06:19 -0800
From:   John Stultz <john.stultz@...aro.org>
To:     lkml <linux-kernel@...r.kernel.org>
Cc:     John Stultz <john.stultz@...aro.org>,
        Wei Xu <xuwei5@...ilicon.com>,
        Guodong Xu <guodong.xu@...aro.org>,
        Amit Pundir <amit.pundir@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        John Youn <johnyoun@...opsys.com>,
        Douglas Anderson <dianders@...omium.org>,
        Chen Yu <chenyu56@...wei.com>,
        Kishon Vijay Abraham I <kishon@...com>,
        Felipe Balbi <felipe.balbi@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org
Subject: [RFC][PATCH 0/3 v2] Try to connect HiKey's usb extcon to dwc2 driver

After feedback from Kishon and John, I've reworked my efforts
to add extcon support to the phy-hi6220-usb driver and instead
have added the extcon support to the dwc2 driver directly.

This avoids odd interactions trying to wire the generic phy to
the otg gadget structure to send proper connect/disconnect
notifications to the hcd core.

Since this is my first stab at moving it to the dwc2 driver,
I suspect there is further improvements possible, so please let
me know if there's anything folks would like to see changed.

In this series, I also re-added an older patch to force port
resuming when transitioning from host -> otg mode, as that was
catching me as the bus would suspend if there were no devices
plugged into the host ports and then would not work when
replugging in the gadget cable. If there is a better way to
handle this bus resuming logic in gadget mode, please let me 
know.

Feedback and guidance would be greatly appreciated!

thanks
-john

Cc: Wei Xu <xuwei5@...ilicon.com>
Cc: Guodong Xu <guodong.xu@...aro.org>
Cc: Amit Pundir <amit.pundir@...aro.org>
Cc: Rob Herring <robh+dt@...nel.org>
Cc: John Youn <johnyoun@...opsys.com>
Cc: Douglas Anderson <dianders@...omium.org>
Cc: Chen Yu <chenyu56@...wei.com>
Cc: Kishon Vijay Abraham I <kishon@...com>
Cc: Felipe Balbi <felipe.balbi@...ux.intel.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: linux-usb@...r.kernel.org

Chen Yu (1):
  usb: dwc2: Force port resume on switching to device mode

John Stultz (2):
  usb: dwc2: Add extcon support to dwc2 driver
  usb: dwc2: Avoid suspending if we're in gadget mode

 arch/arm64/boot/dts/hisilicon/hi6220.dtsi | 11 +++++++++
 drivers/usb/dwc2/core.h                   | 16 ++++++++++++
 drivers/usb/dwc2/core_intr.c              | 25 +++++++++++++++++++
 drivers/usb/dwc2/hcd.c                    | 34 +++++++++++++++++++++++++
 drivers/usb/dwc2/platform.c               | 41 +++++++++++++++++++++++++++++++
 5 files changed, 127 insertions(+)

-- 
2.7.4