device: fix potential truncation of DT-derived device names
While using the encoded path to a device tree node guarantees a unique
identifier for the corresponding device there is a limit on the number
of characters of that name that can be captured when looking up a
device by name from user mode, and the path can exceed that limit.
Synthesize a unique name from the node dependency ordinal instead, and
update the gen_defines script to record the name associated with the
full path in the extern declaration.
Add a build-time check that no device is created with a name that
violates the user mode requirement.
Also update the network device DTS helper functions to use the same
inference for dev_name and label that the real one does, since they
bypass the real one.
Signed-off-by: Peter Bigot <peter.bigot@nordicsemi.no>
diff --git a/scripts/dts/gen_defines.py b/scripts/dts/gen_defines.py
index 0ce1164..5185acb 100755
--- a/scripts/dts/gen_defines.py
+++ b/scripts/dts/gen_defines.py
@@ -132,7 +132,8 @@
print("", file=dev_header_file)
for node in sorted(edt.nodes, key=lambda node: node.dep_ordinal):
- print(f"extern const struct device DEVICE_DT_NAME_GET(DT_{node.z_path_id});", file=dev_header_file)
+ print(f"extern const struct device DEVICE_DT_NAME_GET(DT_{node.z_path_id}); /* dts_ord_{node.dep_ordinal} */",
+ file=dev_header_file)
print("", file=dev_header_file)
print("#ifdef __cplusplus", file=dev_header_file)
