[PATCH 3/5] USB chipidea: introduce dual role mode pdata flags

[Felipe Balbi]

Hi,

On Fri, Mar 08, 2013 at 10:55:46PM +0200, Alexander Shishkin wrote:
> >>>> +     dr_mode = ci->platdata->dr_mode;
> >>>> +     if (dr_mode == USB_DR_MODE_UNKNOWN || dr_mode == USB_DR_MODE_DUAL_ROLE)
> >>>> +             dr_mode = USB_DR_MODE_OTG;
> >>>> +
> >>>>       /* initialize role(s) before the interrupt is requested */
> >>>> -     ret = ci_hdrc_host_init(ci);
> >>>> -     if (ret)
> >>>> -             dev_info(dev, "doesn't support host\n");
> >>>> +     if (dr_mode == USB_DR_MODE_OTG || dr_mode == USB_DR_MODE_HOST) {
> >>>
> >>> this is not something you should be passing via pdata; chipidea core
> >>> should know how to read this data by itself. Meaning that chipidea core
> >>> should be taught about devicetree. But make it optional since now all
> >>> users use DT.
> >>
> >> And I don't think I like the idea of chipidea core calling into device
> >> tree code directly.
> >
> > Hmmm....this means draw :)
> 
> Well, we could go for something like
> 
> ci_hdrc-$(CONFIG_OF) += of.o
> 
> and try to contain the damage there, maybe? Ideas? I would very much
> like to keep the clutter away from the core probe if possible.

damage, what damage ? DeviceTree is quite real and drivers need to cope
with it. If not all platforms support devicetree, make it optional. It's
easy enough to make the choice based on device.of_node being valid or
not.

At the end of the day, it's the chipidea IP which needs dr_mode, not the
glue. Passing the responsability of decoding dr_mode to the glue is
moronic. It's just like asking the glue to control chipidea's clocks.

-- 
balbi
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