[PATCH v4 0/7] ARM: mx28: add usb host function

[s.hauer at pengutronix.de]

On Fri, Aug 05, 2011 at 10:22:54PM +0800, Peter Chen wrote:
> On Fri, Aug 05, 2011 at 03:03:01PM +0200, s.hauer at pengutronix.de wrote:
> > On Fri, Aug 05, 2011 at 07:53:21AM +0000, Lin Tony-B19295 wrote:
> > > Any comments for the patch series?
> > 
> > Yes. The way you handle the USB phys is totally inacceptable. Please
> > understand that there are *two* devices, one is the ehci core and the
> > other is the associated phy.
> > 
> > You need to register the phy as a platform device, the corresponding
> > driver then has to register the phy using some kind of usb_transceiver_register().
> > On the ehci side the mxc-ehci driver has to find its phy using
> > usb_get_transceiver().
> > 
> > Note that the infrastructure needed for this is not in the kernel, but
> > there are patches recently posted on linux-usb:
> > 
> > http://www.spinics.net/lists/linux-usb/msg50148.html
> > 
> > Sascha
> > 
> I have discussed with Heikki, his framework is good, it saperates phys from
> otg driver, so phy's utilities can be called at both otg and
> device only mode, besides it can support usb charger better.
> 
> So, do we pause i.mx28 usb's upstream until Heikki's otg modification in
> master, or just do thing like ulpi.c?

I think you can use Heikkis patches as a base. They will get updates
before hitting mainline, but the changes to the (phy-) driver side
should be trivial. This way we can also detect possible problems with
Heikkis patches. There's plenty of time before the next merge window to
get the patches into shape.

Sascha

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