Subject: Re: pxa27x_udc -- support for usb gadget for pxa27x?
From: Richard Purdie <rpurdie@rpsys.net>
To: Pavel Machek <pavel@suse.cz>
Cc: David Vrabel <dvrabel@cantab.net>, lenz@cs.wisc.edu,
       kernel list <linux-kernel@vger.kernel.org>, dkrivoschokov@dev.rtsoft.ru
In-Reply-To: <436F2BB2.3040008@cantab.net>
References: <20051103221402.GA28206@elf.ucw.cz>
	 <1131057308.8523.92.camel@localhost.localdomain>
	 <20051106204506.GH29901@elf.ucw.cz>  <436F2BB2.3040008@cantab.net>
Content-Type: text/plain
Date: Mon, 07 Nov 2005 10:43:52 +0000
Message-Id: <1131360232.8375.50.camel@localhost.localdomain>
Mime-Version: 1.0
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 1054
Lines: 30

On Mon, 2005-11-07 at 10:25 +0000, David Vrabel wrote:
> 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
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.

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.

Cheers,

Richard


-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/