u-boot/doc/README.omap-ulpi-viewport
Govindraj.R 928c4bdf9b usb: ulpi: Add omap-ulpi-view port support
Based on discussion from this thread [1].
Adding omap-view port that helps us in using the generic ulpi
framework for any ulpi phy ops using the INSNREG05_ULPI viewport
reg available on omap platform.

Currently ehci ports are available on omap3/4 platforms so enable the same
for beagle and panda, patch is tested on the same boards.

Thanks to Igor Grinberg <grinberg@compulab.co.il> for reviewing the
omap-ehci patches and suggesting this approach.

[1]: http://www.mail-archive.com/u-boot@lists.denx.de/msg76076.html

Tested-by: Stefano Babic <sbabic@denx.de>
Acked-by: Igor Grinberg <grinberg@compulab.co.il>
Signed-off-by: Govindraj.R <govindraj.raja@ti.com>
2012-02-12 10:11:30 +01:00

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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.