diff options
Diffstat (limited to 'doc/README.omap-ulpi-viewport')
| -rw-r--r-- | doc/README.omap-ulpi-viewport | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/doc/README.omap-ulpi-viewport b/doc/README.omap-ulpi-viewport new file mode 100644 index 0000000000..a5240b9e29 --- /dev/null +++ b/doc/README.omap-ulpi-viewport @@ -0,0 +1,27 @@ +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. |