omap legacy full speed usb cleanup for v3.6
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Cover letter [PATCH 0/4] omap legacy full speed usb cleanup for v3.6
Quoted 11 lines · Paul Walmsley
Quoted 5 lines · Tony Lindgren
This series removes the old legacy fulls speed support for omap2 as it's pretty much only used for omap1 only.
For omap2, only n8x0 seems to have active development, and that has the external high speed tusb chip instead.
Just FYI, full speed host USB exists on OMAP4. It's in section 23.13 of the TRM and we have a hwmod for it. No idea if anyone is actually using it.
Interesting, so it's back on omap4 for some legacy compability reasons i guess. It's not mentioned for omap3 at all, but maybe it's lurking around there somewhere too.
Looking at the omap4 TRM, looks like there are two instances of OHCI:
The HS OHCI/EHCI controller, and the legacy FS OHCI only controller. The legacy one is using separate transceiver pins (usbc1_*) from the HS OHCI/EHCI controller pins (usbb[12]_*).
As the OHCI registers are standard, I'd assume it would be possible to make the FS USB instance to work with the mach-omap2/usb-host.c and drivers/usb/host/ohci-omap3.c driver. So it should still be OK to remove the code in this series.
I doubt that anybody would want to use the legacy FS OHCI controller instead of the HS OHCI/EHCI controller though.. If somebody is actually using the legacy controller at usbc1_* pins, please respond.
Regards,
Tony