On Mon, 25 Mar 2013, Felipe Balbi wrote:
> > @@ -62,22 +64,26 @@ static const struct ehci_driver_overrides
> > platform_overrides __initdata = {
> > .reset = ehci_platform_reset,
> > };
> >
> > +static struct usb_ehci_pdata ehci_platform_defaults;
>
> this ehci_platform_defaults is quite a hack. Would be much better to see
> a proper re-factoring of the code so that it actually learns about DT
> *and* platform_data.
>
> So, if dev->dev.platform_data is NULL, you shouldn't error, rather you
> should just assume the default, rather than this quick little hack.
>
> Alan has final saying though.
IMO, using ehci_platform_defaults _is_ a way of assuming the default.
In other words, it's not a bad hack. I'm okay with this this approach
(in fact, it was my suggestion originally).
On the other hand, it would be nice to have a clearer way of indicating
that the driver was invoked because of a DT match, something better
than just noticing that dev->dev.platform_data is NULL. But I guess
this is a legitimate option even for regular platform drivers -- if
they don't have any specific requirements, they may as well pass a NULL
pointer instead of a pointer to an empty structure.
Alan Stern
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