Merge nodes with local target label references

This change makes sure that nodes with target label references doesn't
create additional fragments if the label can been resolved
locally. Target path references are not resolved locally and will
generate a fragment.

Previously the dts below would generate two fragments:

/dts-v1/;
/plugin/;
&x { a: a@0 {};};
&a { b {}; };

This commit essentially reverts part of the commit "Correct overlay
syntactic sugar for generating target-path fragments". The main reason
we want to do this is that it breaks consumers of dtbo:s that can't
resolve references between fragments in the same dtbo (like the linux
4.1 kernel). In addition creating a fragment for each label reference
substantially increases the size of the resulting dtbo for some use
cases.

Signed-off-by: Fredrik Markstrom <fredrik.markstrom@gmail.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

1 files changed, 2 insertions, 2 deletions

diff --git a/dtc-lexer.l b/dtc-lexer.l
index 615b7ec..06c0409 100644
--- a/dtc-lexer.l
+++ b/dtc-lexer.l
@@ -213,14 +213,14 @@ static void PRINTF(1, 2) lexical_error(const char *fmt, ...);
 <*>\&{LABEL}	{	/* label reference */
 			DPRINT("Ref: %s\n", yytext+1);
 			yylval.labelref = xstrdup(yytext+1);
-			return DT_REF;
+			return DT_LABEL_REF;
 		}
 
 <*>"&{/"{PATHCHAR}*\}	{	/* new-style path reference */
 			yytext[yyleng-1] = '\0';
 			DPRINT("Ref: %s\n", yytext+2);
 			yylval.labelref = xstrdup(yytext+2);
-			return DT_REF;
+			return DT_PATH_REF;
 		}
 
 <BYTESTRING>[0-9a-fA-F]{2} {