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gen_defines: add _CHILD_IDX macros for nodes with parents

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These expose every node's index in its parent's list of children to C.
The root node has no parent, so no _CHILD_IDX macro is generated for
it.

Keep macros.bnf up to date with the new generated macros.

Signed-off-by: Martí Bolívar <marti.bolivar@nordicsemi.no>
This commit is contained in:
Martí Bolívar 2022-03-23 13:41:09 -07:00 • committed by Carles Cufí
commit 50f9b3c2ca
2 changed files with 6 additions and 0 deletions
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2
doc/guides/dts/macros.bnf
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@ -67,6 +67,8 @@ node-macro =/ %s"DT_N" path-id %s"_FOREACH_CHILD_VARGS"
; over each child node with status "okay".
node-macro =/ %s"DT_N" path-id %s"_FOREACH_CHILD_STATUS_OKAY"
node-macro =/ %s"DT_N" path-id %s"_FOREACH_CHILD_STATUS_OKAY_VARGS"
; The node's zero-based index in the list of it's parent's child nodes.
node-macro =/ %s"DT_N" path-id %s"_CHILD_IDX"
; The node's status macro; dt-name in this case is something like "okay"
; or "disabled".
node-macro =/ %s"DT_N" path-id %s"_STATUS_" dt-name

4
scripts/dts/gen_defines.py
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@ -132,6 +132,10 @@ def main():
out_dt_define(f"{node.z_path_id}_PARENT",
f"DT_{node.parent.z_path_id}")
out_comment(f"Node's index in its parent's list of children:")
out_dt_define(f"{node.z_path_id}_CHILD_IDX",
node.parent.child_index(node))
write_children(node)
write_dep_info(node)
write_idents_and_existence(node)