diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 65c2cfa..b8bd4e1 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -3010,7 +3010,7 @@
 
 			# linux device tree files
 			my $dt_path = $root . "/dts/Bindings/";
- 			my $vp_file = $dt_path . "vendor-prefixes.txt";
++			my $vp_file = $dt_path . "vendor-prefixes.yaml";
 
 			# barebox-specific bindings
 			$dt_path = $dt_path . " " . $root . "/Documentation/devicetree/bindings/";
@@ -3028,7 +3028,7 @@
 
 				next if $compat !~ /^([a-zA-Z0-9\-]+)\,/;
 				my $vendor = $1;
-				`grep -Eq "^$vendor\\b" $vp_file`;
++				`grep -Eq "\\"\\^\Q$vendor\E,\\.\\*\\":" $vp_file`;
 				if ( $? >> 8 ) {
 					WARN("UNDOCUMENTED_DT_STRING",
 					     "DT compatible string vendor \"$vendor\" appears un-documented -- check $vp_file\n" . $herecurr);