Reference code ""drivers/usb/ulpi/omap-ulpi-viewport.c"
  
  Contains the ulpi read write api's to perform
  any ulpi phy port access on omap platform.
  
  On omap ehci reg map contains INSNREG05_ULPI
  register which offers the ulpi phy access so
  any ulpi phy commands should be passsed using this
  register.
  
  omap-ulpi-viewport.c is a low level function
  implementation of "drivers/usb/ulpi/ulpi.c"
  
  To enable and use omap-ulpi-viewport.c
  we require CONFIG_USB_ULPI_VIEWPORT_OMAP and
  CONFIG_USB_ULPI be enabled in config file.
  
  Any ulpi ops request can be done with ulpi.c
  and soc specific binding and usage is done with
  omap-ulpi-viewport implementation.
  
  Ex: scenario:
  omap-ehci driver code requests for ulpi phy reset if
  ehci is used in phy mode, which will call ulpi phy reset
  the ulpi phy reset does ulpi_read/write from viewport
  implementation which will do ulpi reset using the
  INSNREG05_ULPI register.