[PATCH,RFC] usb: add devicetree helpers for determining dr_mode and phy_type

I prefer u32 here, because we have the matching enum. Otherwise we end
up with:

of_property_read_string(...,&type);

if (!strcmp(type, "ulpi"))
	foo();
else if (!strcmp(type, "utmi"))
	bar();
else if (!strcmp(type, "pipe3"))
	baz();
else
	BUG();

and I don't like that, it's ugly and error prone.

Error prone? I guess my mileage varies. Especially compared to the
probability devicetree creators pick the wrong number.

It also removes the (probably implicit) rule that the enum mustn't be
modified since it is exported to users.

Also, you could map the strings to the enum first and then switch-case
over it to make the code nicer.

-- 
Pengutronix e.K.                           | Wolfram Sang                |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
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