[PATCHv6 0/5] USB: gadget: atmel_usba_udc: Driver improvements

[Sylvain Rochet]

Start clocks on rising edge of the Vbus signal, stop clocks on falling
edge of the Vbus signal.

Add suspend/resume with wakeup support.

This series is based on linux-next and depends on this complete series:
  https://lkml.org/lkml/2015/1/12/209
which is currently only partially pushed to linux-next, the following 
patch should be pushed along with this series:
  https://lkml.org/lkml/2015/1/12/212

Changes since v5:
  * Some boards does not support configuring a GPIO interrupt on a specific
    edge (rising only or falling only). As suggested added a config boolean
    to distinguish between boards with and without support
  * Added a missing mutex_lock()/unlock() in usba_udc_suspend(), we need to
    protect usba_stop() because usba_start() and usba_stop() can still 
    be called by Vbus IRQ handler.
  * Rebased the full series on linux-next
  * Patch cleaning with the help of checkpatch.pl

Changes since v4:
  * Now using IRQ_NOAUTOEN flag to remove the unused check for
    udc->driver is not NULL in the Vbus IRQ.
  * Reworked the start/stop of clocks on Vbus edges to prepare for
    suspend/resume support, factorised start and stop procedures
  * New patch, suspend/resume for USBA with wakeup support

Changes since v3:
  * Added stable tag for the first patch
  * As suggested, removed the unused check for udc->driver is NULL in
    Vbus IRQ by requesting IRQ after udc->driver is set and by releasing
    IRQ before udc->driver is cleared
  * Rebased the core patch of this series against the just explained changes

Changes since v2:
  * Use spin_lock_irqsave/unlock_irqrestore instead of spin_lock/unlock in
    threaded interrupt because we are not in irq context anymore
  * Removed useless and probably harmful IRQF_NO_SUSPEND from
    devm_request_threaded_irq() flags

Changes since v1:
  * Using a threaded irq and mutex instead of spinclock as suggested
  * Moved a silently fixed bug in a separate patch (1/2)

Sylvain Rochet (5):
  USB: gadget: atmel_usba_udc: Fixed vbus_prev initial state
  USB: gadget: atmel_usba_udc: Request an auto disabled Vbus signal IRQ
    instead of an auto enabled IRQ request followed by IRQ disable
  USB: gadget: atmel_usba_udc: Start clocks on rising edge of the Vbus
    signal, stop clocks on falling edge of the Vbus signal
  USB: gadget: atmel_usba_udc: Prepare for IRQ single edge support
  USB: gadget: atmel_usba_udc: Add suspend/resume with wakeup support

 drivers/usb/gadget/udc/atmel_usba_udc.c | 244 +++++++++++++++++++++++---------
 drivers/usb/gadget/udc/atmel_usba_udc.h |   9 +-
 2 files changed, 188 insertions(+), 65 deletions(-)

-- 
2.1.4