linux-kernel - [RFC][PATCH 0/3] Try to connect hikey's usb phy to dwc2 driver

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Date:   Tue, 22 Nov 2016 19:46:46 -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] Try to connect hikey's usb phy to dwc2 driver

After earlier attempts[1] at submitting somewhat hackish fixes
to the dwc2 driver, I realized the core issue seemed to be the
overly simplistic phy driver.

I've connected the phy-hi6220-usb.c driver to extcon so it now
gets connection and disconnection signals on the usb gadget
cable. And I modified the driver so it registers a usb-phy and
calls usb_gadget_vbus_connect/disconnect() appropriately.

Unfortunately this doesn't quite work with the dwc2 driver,
so I've hacked that driver to allow it to function.

With these changes, while likely not correct, things function
well, and I was able to drop two of the hackish fixups from the
earlier set. I still needed one patch to keep the usb bus from
suspending while in gadget mode, so I've included that in this
series.

[1]: http://www.mail-archive.com/linux-kernel@vger.kernel.org/msg1272880.html

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

John Stultz (3):
  phy: phy-hi6220-usb: Wire up extconn support to hikey's phy driver
  HACK: dwc2: force dual use of uphy and phy
  usb: dwc2: Avoid suspending if we're in gadget mode

 arch/arm64/boot/dts/hisilicon/hi6220.dtsi |  11 +++
 drivers/phy/Kconfig                       |   2 +
 drivers/phy/phy-hi6220-usb.c              | 139 ++++++++++++++++++++++++++++++
 drivers/usb/dwc2/hcd.c                    |   3 +
 drivers/usb/dwc2/platform.c               |   4 +-
 5 files changed, 157 insertions(+), 2 deletions(-)

-- 
2.7.4