[PATCH v9 0/9] Add tested id switch and vbus connect detect support for Chipidea

[Peter Chen]

Changes for v9:
- Some small comments from Alex like: variable comment for otg event
additional newline. [3/9]
- Import function tell show if the controller has otg capable, if
the controller supports both host and device, we think it is otg
capable, and can read OTGSC. [3/9]
- Merge two otg patches [v8 3/8] and [v8 4/8] to one [v9 3/9]. [3/9]
- Add inline to ci_hdrc_gadget_destroy if CONFIG_USB_CHIPIDEA_UDC
is not defined, it can fix one build warning "defined but not used"
[3/9]
- One comment from Felipe about changing calling gadget disconnect
API at chipidea's udc driver. I move calling ci->driver->disconnect
from _gadget_stop_activity to which calls _gadget_stop_activity except
ci13xxx_stop, as udc core will call disconnect when do rmmod gadget. [7/9]
- Add ci core probe's return value to ci's platform_data, we do this
for getting core's probe's result at platform layer, and quit it
if the core's probe fails. [8/9] [9/9]

Changes for v8:
- Add ci_supports_gadget helper to know if the controller
supports gadget, if the controller supports gadget, it
needs to read otgsc to know the vbus value, basically,
if the controller supports gadget, it will support host
as well [3/8]
- At ci_hdrc_probe, it needs to add free memory at error path
[3/8]
- Cosolidate ci->driver = NULL at ci13xxx_stop
[8/8]

Changes for v7:
For Patch 8/8, we only need to set ci->driver to NULL when usb cable
is not connected, for other changes, it will case some runtime pm
unmatch and un-align with udc-core & composite driver problems.

Changes for v6:
- Add Alex comments for init/destroy function [3/8] [4/8]
- Remove memset(&ci->gadget, 0, sizeof(ci->gadget)) at destory function [4/8]
- Add Kishon's comment: Change the format of struct usb_otg otg at drivers/usb/chipidea/ci.h
[1/8]
- Add comments for CI_VBUS_STABLE_TIMEOUT [3/8]
- Change the otg_set_peripheral return value check as the fully
chipidea driver users don't need it. [4/8]
- Fix one bug that the oops when re-plug in usb cable after
rmmod gadget [8/8]

Anyone who has tested this patchset, please give a tested-by, thanks.

This patchset adds tested otg id switch function and
vbus connect/disconnect detection for chipidea driver.
The mainly design of id/vbus handling follows msm otg driver.
I hope the msm usb maintainer can have a look of this patchset,
and give some comments, and move the whole msm usb driver to
chipidea framework if possible in the future.

This patch is fully tested at imx6 sabresd platform.
My chipidea repo: https://github.com/hzpeterchen/linux-usb.git
which is rebased of Sascha's git
(git://git.pengutronix.de/git/imx/linux-2.6.git tags/usb-chipidea-otg-for-next)

At sascha's tag, it finishes some dr_mode and phy_type patches,
in that way, we can choose host-only and gadget-only function at
dts file as well as we can choose different phy setting.

Besides sascha's work, there are some Michael Grzeschik/Marc Kleine-Budde
usbmisc patch, imx chipidea suspend/resume patch, and one pin control
patch for imx6

Peter Chen (9):
  Revert "USB: chipidea: add vbus detect for udc"
  usb: chipidea: add otg file
  usb: chipidea: add otg id switch and vbus connect/disconnect detect
  usb: chipidea: udc: add pullup/pulldown dp at hw_device_state
  usb: chipidea: udc: retire the flag CI13_PULLUP_ON_VBUS
  usb: chipidea: imx: add internal vbus regulator control
  usb: chipidea: udc: fix the oops when plugs in usb cable after rmmod
    gadget
  usb: chipidea: tell platform layer the ci core probe's result
  usb: chipidea: imx: fix the error that using uninitialized pointer

 drivers/usb/chipidea/Makefile      |    2 +-
 drivers/usb/chipidea/bits.h        |   10 ++
 drivers/usb/chipidea/ci.h          |   14 +++-
 drivers/usb/chipidea/ci13xxx_imx.c |   85 ++++++++++++----
 drivers/usb/chipidea/ci13xxx_msm.c |    1 -
 drivers/usb/chipidea/core.c        |  192 ++++++++++++++++++++++++++++++++----
 drivers/usb/chipidea/host.c        |    6 +
 drivers/usb/chipidea/host.h        |    6 +-
 drivers/usb/chipidea/otg.c         |   68 +++++++++++++
 drivers/usb/chipidea/otg.h         |    9 ++
 drivers/usb/chipidea/udc.c         |  118 ++++++++++------------
 drivers/usb/chipidea/udc.h         |    4 +
 include/linux/usb/chipidea.h       |    2 +-
 13 files changed, 405 insertions(+), 112 deletions(-)
 create mode 100644 drivers/usb/chipidea/otg.c
 create mode 100644 drivers/usb/chipidea/otg.h