RE: [PATCH] dtc: parser: Add label while overriding nodes

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> -----Original Message-----
> From: Rob Herring [mailto:robherring2@xxxxxxxxx]
> Sent: Wednesday, January 28, 2015 5:05 AM
> To: Devshatwar, Nikhil
> Cc: devicetree-compiler@xxxxxxxxxxxxxxx; devicetree@xxxxxxxxxxxxxxx;
> devicetree-spec@xxxxxxxxxxxxxxx; linux-omap
> Subject: Re: [PATCH] dtc: parser: Add label while overriding nodes
> 
> On Thu, Jan 8, 2015 at 8:12 AM, Nikhil Devshatwar <nikhil.nd@xxxxxx>
> wrote:
> > Current device tree compiler allows to define multiple labels when
> > defining the device node the first time. Typically device nodes are
> > defined in DTSI files. Now these nodes can be overriden for updating
> > some of the properties. Typically, device nodes are overridden in DTS
> files.
> >
> > When working with adapter boards, most of the time adapter board can
> > fit to multiple base boards. But depending on which base board it is
> > connected to, the devices on the adapter board would be children of
> different devices.
> >
> > e.g. On dra7-evm.dts, i2c2 is exported for expansion connector
> whereas
> > on dra72-evm.dts, i2c5 is exported for expansion connector.
> > This causes a problem when writing a generic device tree file for the
> > adapter board. Because, you cannot know wheather all the devices on
> 
> s/wheather/whether/
> 
> > adpter board are present on i2c or i2c5.
> 
> s/adpter/adapter/
> 
> > The problem can be solved by adding a common label (e.g. i2cexp) in
> > both of the DTS files when overriding the device nodes for i2c2 or
> i2c5.
> > This way, generic adapter board file would override the i2cexp. And
> > depending on which base board you use the adpter board, all the
> > devices
> 
> s/adpter/adapter/
> 
> > are automatically added for correct device nodes.
> >
> > Change-Id: I3ad7247a79baed7268a91fc691360aece73d6d1b
> 
> Get rid of this Gerrit nonsense.
> 
> > Signed-off-by: Nikhil Devshatwar <nikhil.nd@xxxxxx>
> > ---
> >  scripts/dtc/dtc-parser.y |   12 ++++++++++++
> >  1 file changed, 12 insertions(+)
> 
> You need to send this against upstream dtc, not the copy in the kernel.
> 
> Seems like a reasonable change, but I'm not too familar with dtc
> source.
> 

OK, no problem

Thanks,
Nikhil D

> > diff --git a/scripts/dtc/dtc-parser.y b/scripts/dtc/dtc-parser.y
> index
> > f412460..d9ed3b7 100644
> > --- a/scripts/dtc/dtc-parser.y
> > +++ b/scripts/dtc/dtc-parser.y
> > @@ -145,6 +145,18 @@ devicetree:
> >                 {
> >                         $$ = merge_nodes($1, $3);
> >                 }
> > +
> > +       | devicetree DT_LABEL DT_REF nodedef
> > +               {
> > +                       struct node *target = get_node_by_ref($1,
> $3);
> > +
> > +                       add_label(&target->labels, $2);
> > +                       if (target)
> > +                               merge_nodes(target, $4);
> > +                       else
> > +                               print_error("label or path, '%s', not
> found", $2);
> > +                       $$ = $1;
> > +               }
> >         | devicetree DT_REF nodedef
> >                 {
> >                         struct node *target = get_node_by_ref($1,
> $2);
> > --
> > 1.7.9.5
> >
> > --
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