Linux-3.14-rc2: Order of serial node compatibles in DTS files.

[Scott Wood]

On Tue, 2014-02-11 at 23:51 +0100, Sebastian Hesselbarth wrote:
> On 02/11/2014 11:33 PM, Kumar Gala wrote:
> > Hmm,
> >
> > Wondering if this caused the issue:
> >
> > commit 105353145eafb3ea919f5cdeb652a9d8f270228e
> > Author: Sebastian Hesselbarth <sebastian.hesselbarth at gmail.com>
> > Date:   Tue Dec 3 14:52:00 2013 +0100
> >
> >      OF: base: match each node compatible against all given matches first
> 
> [adding Arnd on Cc]
> 
> Could be. I checked tty/serial/of_serial.c and it does not provide a
> compatible for "fsl,ns16550". Does reverting the patch fix the issue
> observed?
> 
> I don't think the missing compatible is causing it, but of_serial
> provides a DT match for .type = "serial" just to fail later on
> with the error seen above.
> 
> The commit in question reorders of_match_device in a way that match
> table order is not relevant anymore. This can cause it to match
> .type = "serial" first here.
> 
> Rather than touching the commit, I suggest to remove the problematic
> .type = "serial" from the match table. It is of no use anyway.

Regardless of whether .type = "serial" gets removed, it seems wrong for
of_match_node() to accept a .type-only match (or .name, or anything else
that doesn't involve .compatible) before it accepts a compatible match
other than the first in the compatible property.

-Scott