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dtc: Add an option to generate __local_fixups__ and __fixups__

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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>
This commit is contained in:
Uwe Kleine-König 2023-05-23 10:09:41 +02:00 • committed by David Gibson
parent e8364666d5
commit 589d8c7653
2 changed files with 21 additions and 1 deletions
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14
Documentation/manual.txt
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@ -126,6 +126,20 @@ Options:
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