Re: pxa27x_udc -- support for usb gadget for pxa27x?

From: Mark Underwood (basicmark_at_yahoo.com)
Date: 11/26/05

  • Next message: Paul E. McKenney: "[PATCH] Make RCU task_struct safe for oprofile" 
    Date:	Sat, 26 Nov 2005 21:04:37 +0000 (GMT)
To: Pavel Machek <pavel@ucw.cz>, Richard Purdie <rpurdie@rpsys.net>

    --- Pavel Machek <pavel@ucw.cz> wrote:

    > Hi!
    >
    > > > Pavel Machek wrote:
    > > > >
    > > > > ...for the spitz. Do you think I can just copy this one? ...eh, no,
    > > > > will not fly, there's no SPITZ_GPIO_USB_PULLUP.
    > > >
    > > > There are internal pull-ups (and pull-downs) perhaps you can use those?
    > > >
    > > > Hmmm. Though the C5 stepping might be different -- best to check the
    > > > "specification update".
    > >
    > > I can confirm that you'll need to use the internal pxa27x pullups
    > > for
    >
    > How can I use pxa27x pullups?
    >
    > > this. You'll probably also need to make sure GPIO 35 is low to ensure
    > > the usb Vcc line isn't powered (as it would be in usb host mode.
    >
    > Are you sure? spitz_ohci_init() seems to play with GPIO 37.
    >
    > (Perhaps spitz_ohci_init should disable the other GPIO?)
    >
    > > Ultimately, it would be nice to have the Zaurus detect whether a usb
    > > host or client was present (using gpio 41 maybe?) and then activate the
    > > host (ohci) or client (pxa27x_udc) driver as appropriate.
    >
    > Unfortunately, that would make ohci unfunctional for me. I have normal
    > usb device cable, connected to "USB gender changer" -- basically two
    > female connectors -- so that I can plug USB network card into that.
    >

    Just a thought. How about a sysfs entry which you can use to jam the device into either slave or
    host mode?

    Mark

    > Pavel
    >
    > --
    > Thanks, Sharp!
    > -
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