commit 345da78b5bbdc090b4598a02b3a35516378afd02
author Peter Bigot <peter.bigot@nordicsemi.no> Wed Dec 02 09:04:27 2020 -0600
committer Anas Nashif <anas.nashif@intel.com> Sun Dec 13 19:25:24 2020 -0500
tree 83c36c77d37ef130a8e6df4a9d9632b98b7bab1d
parent b6dc0a24f703a5b5429dec114cf5f45a9697283b

devicetree: basic support for enum tokens

Whenever a devicetree binding defines a string property whose
enumerated values are all tokenizable, generate C macros for each
property value that are the corresponding tokens.

Note that "token" is distinct from "identifier": both 'foo' and '123'
are valid tokens, but only 'foo' is a valid identifier. We permit some
strings which are not valid identifiers in anticipation that the
generalization may be useful, e.g. when defining macros that paste the
token onto a prefix that makes the whole thing an identifier.

Fixes: #21273
Signed-off-by: Peter Bigot <peter.bigot@nordicsemi.no>
Signed-off-by: Martí Bolívar <marti.bolivar@nordicsemi.no>

scripts/dts/gen_defines.py

diff --git a/scripts/dts/gen_defines.py b/scripts/dts/gen_defines.py
index d43c37d..b6e3665 100755
--- a/scripts/dts/gen_defines.py
+++ b/scripts/dts/gen_defines.py
@@ -423,6 +423,17 @@
         if prop.enum_index is not None:
             # DT_N_<node-id>_P_<prop-id>_ENUM_IDX
             macro2val[macro + "_ENUM_IDX"] = prop.enum_index
+            spec = prop.spec
+
+            if spec.enum_tokenizable:
+                as_token = prop.val_as_token
+
+                # DT_N_<node-id>_P_<prop-id>_ENUM_TOKEN
+                macro2val[macro + "_ENUM_TOKEN"] = as_token
+
+                if spec.enum_upper_tokenizable:
+                    # DT_N_<node-id>_P_<prop-id>_ENUM_UPPER_TOKEN
+                    macro2val[macro + "_ENUM_UPPER_TOKEN"] = as_token.upper()
 
         if "phandle" in prop.type:
             macro2val.update(phandle_macros(prop, macro))