dtc: Add an option to generate __local_fixups__ and __fixups__
This records detailed usage of labels in a dtb. This is needed in
overlays (and enabled implicitly for these). For ordinary device trees
it can be used to restore labels when compiling back to dts format.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Message-Id: <20230523080941.419330-1-u.kleine-koenig@pengutronix.de>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
diff --git a/Documentation/manual.txt b/Documentation/manual.txt
index 15a7837..598c6e6 100644
--- a/Documentation/manual.txt
+++ b/Documentation/manual.txt
@@ -126,6 +126,20 @@
property for each label. The property's name is the label name and the
value is the path of the labeled node.
+ -L
+ Possibly generates a __local_fixups__ and a __fixups__ node at the root node.
+ For each property that contains a phandle reference using a locally
+ defined phandle, the __local_fixups__ node contains a property (at path
+ /__local_fixups__/$a if $a is the path of the node). Its value is a list
+ of offsets that are phandle values. If there are no such properties, no
+ __local_fixups__ node is generated.
+ For each undefined label used in at least one reference, the __fixups__
+ node contains a property. Its name is the label name, its value is a
+ list of locations where the label is used in a reference in the format
+ "path:property:offset". If there is no undefined label, no __fixups__
+ nodes is generated.
+ Enabled by default for compiling overlays (i.e. dts files with a
+ /plugin/ tag).
-A
Generate automatically aliases for all node labels. This is similar to
diff --git a/dtc.c b/dtc.c
index bc786c5..d2e4e2b 100644
--- a/dtc.c
+++ b/dtc.c
@@ -47,7 +47,7 @@
/* Usage related data. */
static const char usage_synopsis[] = "dtc [options] <input file>";
-static const char usage_short_opts[] = "qI:O:o:V:d:R:S:p:a:fb:i:H:sW:E:@AThv";
+static const char usage_short_opts[] = "qI:O:o:V:d:R:S:p:a:fb:i:H:sW:E:@LAThv";
static struct option const usage_long_opts[] = {
{"quiet", no_argument, NULL, 'q'},
{"in-format", a_argument, NULL, 'I'},
@@ -67,6 +67,7 @@
{"warning", a_argument, NULL, 'W'},
{"error", a_argument, NULL, 'E'},
{"symbols", no_argument, NULL, '@'},
+ {"local-fixups", no_argument, NULL, 'L'},
{"auto-alias", no_argument, NULL, 'A'},
{"annotate", no_argument, NULL, 'T'},
{"help", no_argument, NULL, 'h'},
@@ -252,6 +253,11 @@
case '@':
generate_symbols = 1;
break;
+
+ case 'L':
+ generate_fixups = 1;
+ break;
+
case 'A':
auto_label_aliases = 1;
break;
