Revert "scripts: gen_defines: re-work write_bus() with augmented nodes"

This reverts commit 3939556fc3.

Reverted as the changes to gen_defines.py break things.

Signed-off-by: Kumar Gala <kumar.gala@linaro.org>

scripts/dts/gen_defines.py

@@ -730,18 +730,8 @@ def write_bus(node):
     if node.bus_node.label is None:
         err(f"missing 'label' property on bus node {node.bus_node!r}")
 
-    primary_macro = None
-    def write_bus_node_for_ident(node, ident):
-        # #define DT_<IDENT>_BUS_NAME <BUS-LABEL>
-
-        nonlocal primary_macro
-        if primary_macro is None:
-            primary_macro = out(f"{ident}_BUS_NAME",
-                                quote_str(str2ident(node.bus_node.label)))
-        else:
-            out(f"{ident}_BUS_NAME", primary_macro)
-
-    for_each_ident(node, write_bus_node_for_ident)
+    # #define DT_<DEV-IDENT>_BUS_NAME <BUS-LABEL>
+    out_node_s(node, "BUS_NAME", str2ident(node.bus_node.label))
 
     for compat in node.compats:
         # #define DT_<COMPAT>_BUS_<BUS-TYPE> 1
@@ -785,6 +775,45 @@ def node_ident(node):
     return ident
 
 
+def node_aliases(node):
+    # Returns a list of aliases for 'node', used e.g. when building macro names
+
+    return node_path_aliases(node) + node_instance_aliases(node)
+
+
+def node_path_aliases(node):
+    # Returns a list of aliases for 'node', based on the aliases registered for
+    # it in the /aliases node. Used e.g. when building macro names.
+
+    if node.matching_compat is None:
+        return []
+
+    compat_s = str2ident(node.matching_compat)
+
+    aliases = []
+    for alias in node.aliases:
+        aliases.append(f"ALIAS_{str2ident(alias)}")
+        # TODO: See if we can remove or deprecate this form
+        aliases.append(f"{compat_s}_{str2ident(alias)}")
+
+    return aliases
+
+
+def node_instance_aliases(node):
+    # Returns a list of aliases for 'node', based on the compatible string and
+    # the instance number (each node with a particular compatible gets its own
+    # instance number, starting from zero).
+    #
+    # This is a list since a node can have multiple 'compatible' strings, each
+    # with their own instance number.
+
+    res = []
+    for compat in node.compats:
+        instance_no = node.edt.compat2enabled[compat].index(node)
+        res.append(f"INST_{instance_no}_{str2ident(compat)}")
+    return res
+
+
 def write_addr_size(edt, prop_name, prefix):
     # Writes <prefix>_BASE_ADDRESS and <prefix>_SIZE for the node pointed at by
     # the /chosen property named 'prop_name', if it exists
@@ -1101,6 +1130,47 @@ def str2ident(s):
             .upper()
 
 
+def out_node(node, ident, val, name_alias=None, deprecation_msg=None):
+    # Writes a
+    #
+    #   <node prefix>_<ident> = <val>
+    #
+    # assignment, along with a set of
+    #
+    #   <node alias>_<ident>
+    #
+    # aliases, for each path/instance alias for the node. If 'name_alias' (a
+    # string) is passed, then these additional aliases are generated:
+    #
+    #   <node prefix>_<name alias>
+    #   <node alias>_<name alias> (for each node alias)
+    #
+    # 'name_alias' is used for reg-names and the like.
+    #
+    # If a 'deprecation_msg' string is passed, the generated identifiers will
+    # generate a warning if used, via __WARN(<deprecation_msg>)).
+    #
+    # Returns the identifier used for the macro that provides the value
+    # for 'ident' within 'node', e.g. DT_MFG_MODEL_CTL_GPIOS_PIN.
+
+    node_prefix = node_ident(node)
+
+    aliases = [f"{alias}_{ident}" for alias in node_aliases(node)]
+    if name_alias is not None:
+        aliases.append(f"{node_prefix}_{name_alias}")
+        aliases += [f"{alias}_{name_alias}" for alias in node_aliases(node)]
+
+    return out(f"{node_prefix}_{ident}", val, aliases, deprecation_msg)
+
+
+def out_node_s(node, ident, s, name_alias=None, deprecation_msg=None):
+    # Like out_node(), but emits 's' as a string literal
+    #
+    # Returns the generated macro name for 'ident'.
+
+    return out_node(node, ident, quote_str(s), name_alias, deprecation_msg)
+
+
 def out_s(ident, val):
     # Like out(), but puts quotes around 'val' and escapes any double
     # quotes and backslashes within it
@@ -1118,8 +1188,7 @@ def out(ident, val, aliases=(), deprecation_msg=None):
     # header, these look like '#define <alias> <ident>'. For the configuration
     # file, the value is just repeated as '<alias>=<val>' for each alias.
     #
-    # If a 'deprecation_msg' string is passed, the generated identifiers will
-    # generate a warning if used, via __WARN(<deprecation_msg>)).
+    # See out_node() for the meaning of 'deprecation_msg'.
     #
     # Returns the generated macro name for 'ident'.
 
@@ -1146,7 +1215,7 @@ def out(ident, val, aliases=(), deprecation_msg=None):
 
 
 def out_define(ident, val, deprecation_msg, out_file):
-    # out() helper for writing a #define. See out() for the meaning of
+    # out() helper for writing a #define. See out_node() for the meaning of
     # 'deprecation_msg'.
 
     s = f"#define DT_{ident:40}"