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

From: John Stultz
Date: Tue Nov 22 2016 - 22:54:49 EST

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

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

Feedback and guidance would be greatly appreciated!


Cc: Wei Xu <xuwei5@xxxxxxxxxxxxx>
Cc: Guodong Xu <guodong.xu@xxxxxxxxxx>
Cc: Amit Pundir <amit.pundir@xxxxxxxxxx>
Cc: Rob Herring <robh+dt@xxxxxxxxxx>
Cc: John Youn <johnyoun@xxxxxxxxxxxx>
Cc: Douglas Anderson <dianders@xxxxxxxxxxxx>
Cc: Chen Yu <chenyu56@xxxxxxxxxx>
Cc: Kishon Vijay Abraham I <kishon@xxxxxx>
Cc: Felipe Balbi <felipe.balbi@xxxxxxxxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: linux-usb@xxxxxxxxxxxxxxx

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(-)