DT && i.MX USB

[Sascha Hauer]

On Tue, Oct 29, 2013 at 01:04:57PM +0400, Alexander Shiyan wrote:
> > On Mon, Oct 28, 2013 at 07:50:21PM +0400, Alexander Shiyan wrote:
> > > Hello.
> > > 
> > > I am trying to migrate i.MX51 ConnectCore board for use DT.
> > > Most stuff are done but I cannot understand how USB subsystem
> > > works with devicetree.
> > > 
> > > First, why barebox uses own "barebox,dr_mode" and "barebox,phy_type"
> > > properties instead of use kernel "dr_mode" and "phy_type"?
> > 
> > By the time I created this binding the binding for the kernel was not
> > mainline, so I decided to use barebox,x to not end up with an
> > incompatible binding. As the binding made it mainline now we can drop
> > the "barebox," now.
> 
> Understood.
> 
> > > Second, how specify flags for USB ports, for example MXC_EHCI_INTERNAL_PHY?
> > > In DT case we can not do it and as result desired port not functional...
> > 
> > Could it be that this flag should simply be dropped? According to the
> > Block diagram (Freescale i.MX53 ref manual v2.1, page 4700) the otg port
> > is hardwired to the internal utmi phy, so having this configurable makes
> > no sense.
> 
> I checked it for i.MX51. Everything works.
> Will it be the right solution for all i.MX CPUs?

At least for i.MX51/53 this is correct. For i.MX51 it seems to be
possible to use the internal UTMI phy or an external ULPI phy for the
OTG port.

> If so, I will write a patch for both issues. Or you?

Go ahead and write a patch. I'll give it a test on my i.MX51 efikasb
then.

Sascha

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