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

[mkl@pengutronix.de (Marc Kleine-Budde)]

On 01/29/2013 03:55 PM, Wolfram Sang wrote:
> 
>> 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.

That's what the code already does.

Marc
-- 
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