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

[w.sang@pengutronix.de (Wolfram Sang)]

> >+	err = of_property_read_string(np, "phy_type", &phy_type);
> >+	if (err < 0)
> >+		return USBPHY_INTERFACE_MODE_NA;
> 
> Why don't we use a u32 property type for the *phy-type*? IMHO we
> should use string property only when the property should be
> absolutely unambiguous (e.g., compatible property should be string).

If we would use u32-numbers in the compatible entry, this would also be
unambiguous, no? 0xd00dfeed would be the at24-driver. Pretty specific.

I don't mind having readable devicetrees. And we have it for ethernet
phys already with strings, so it would be consistent.

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