[J-u-boot.git] / doc / README.omap-ulpi-viewport

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.
Commit	Line	Data
928c4bdf G	1	Reference code ""drivers/usb/ulpi/omap-ulpi-viewport.c"
	2
	3	Contains the ulpi read write api's to perform
	4	any ulpi phy port access on omap platform.
	5
	6	On omap ehci reg map contains INSNREG05_ULPI
	7	register which offers the ulpi phy access so
	8	any ulpi phy commands should be passsed using this
	9	register.
	10
	11	omap-ulpi-viewport.c is a low level function
	12	implementation of "drivers/usb/ulpi/ulpi.c"
	13
	14	To enable and use omap-ulpi-viewport.c
	15	we require CONFIG_USB_ULPI_VIEWPORT_OMAP and
	16	CONFIG_USB_ULPI be enabled in config file.
	17
	18	Any ulpi ops request can be done with ulpi.c
	19	and soc specific binding and usage is done with
	20	omap-ulpi-viewport implementation.
	21
	22	Ex: scenario:
	23	omap-ehci driver code requests for ulpi phy reset if
	24	ehci is used in phy mode, which will call ulpi phy reset
	25	the ulpi phy reset does ulpi_read/write from viewport
	26	implementation which will do ulpi reset using the
	27	INSNREG05_ULPI register.