Re: [Xen-devel] [RFC 01/24] xen/char: dt-uart: Allow the user to give a path to the node

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Mon, 2013-08-19 at 16:09 +0100, Julien Grall wrote:
> On 08/16/2013 10:25 PM, Andre Przywara wrote:
> > On 08/16/2013 11:05 PM, Julien Grall wrote:
> >> On some board, there is no alias to the UART. To avoid modification in
> >> the device tree, dt-uart should also search device by path.
> > 
> > Funny, it wrote almost the same patch two days ago (including the
> > variable renaming, minus the "/" check). Thanks for saving me the
> > cleanup and send-out ;-)
> > It is really useful for Midway!
> > 
> >> To distinguish an alias from a path, dt-uart will check the first
> >> character.
> >> If it's a / then it's path, otherwise it's an alias.
> > 
> > Is that really needed? In my patch I just try it as an alias first, if
> > there is no match (dev == NULL), I try the full path.
> > Are there any ambiguities expected between an alias and a full path?
> 
> Following the ePAPR documentation (section 2.2.4), the name property
> can't contain '/' in the name.
> 
> I choose this solution, because I want to avoid to call the 2 functions
> if it's possible. It's a waste of time to call both if we know that the
> path always start with a '/' and alias not.

This is hardly a hot path. But in any case:

Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>



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