README.omap-ulpi-viewport 899 B

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