dtc: dt-check-style: Rework handling YAML/DTS in rules

Individual rules behave differently depending whether they handle
bindings (YAML) or DTS, but the code was focusing on type of indentation
(spaces vs tabs).  That indentation is actually irrelevant in some
rules, so differentiate based on file type.  This will be more relevant
in the future when more rules act differently on DTS, than on bindings.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Link: https://patch.msgid.link/20260709-dts-style-checker-v5-3-fcc147cb697d@oss.qualcomm.com
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>

diff --git a/scripts/dtc/dt-check-style b/scripts/dtc/dt-check-style
index e715fb1..f5276b5 100755 (executable)
--- a/scripts/dtc/dt-check-style
+++ b/scripts/dtc/dt-check-style
@@ -311,13 +311,16 @@ def collect_labels_and_refs(text):
 
 class Ctx:
     """Context passed to each rule check. Carries the parsed lines,
-    raw text, mode, and indent kind."""
+    raw text, mode and kind."""
 
-    def __init__(self, lines, text, mode, indent_kind):
+    def __init__(self, lines, text, mode, kind):
         self.lines = lines
         self.text = text
         self.mode = mode               # 'relaxed' or 'strict'
-        self.indent_kind = indent_kind  # 'spaces' or 'tab'
+        if kind in DTS_FAMILY:
+            self.file_type = 'dts'
+        else:
+            self.file_type = 'yaml'
 
 
 class Rule:
@@ -347,7 +350,7 @@ def check_tab_in_yaml_example(ctx):
     a #define value are tolerated (those are CPP macros, not DTS).
     For .dts files, this rule does not apply -- tabs are required.
     """
-    if ctx.indent_kind != 'spaces':
+    if ctx.file_type != 'yaml':
         return
     for dl in ctx.lines:
         if dl.linetype == LineType.PREPROCESSOR:
@@ -427,7 +430,7 @@ def check_indent_unit_strict(ctx):
     unit = detect_indent_unit(ctx)
     if unit is None:
         return
-    if ctx.indent_kind == 'spaces':
+    if ctx.file_type == 'yaml':
         if unit != '    ':
             yield (1, 'indent unit must be 4 spaces in strict mode, '
                    'got %r' % unit)
@@ -438,7 +441,7 @@ def check_indent_consistent(ctx):
     unit = detect_indent_unit(ctx)
     if unit is None:
         return
-    if ctx.indent_kind == 'spaces':
+    if ctx.file_type == 'yaml':
         if unit not in ('  ', '    '):
             return  # let check_indent_unit_* report this
     else:
@@ -1023,11 +1026,11 @@ def select_rules(mode, input_kind):
 # Block runner
 # ---------------------------------------------------------------------------
 
-def check_block(text, mode, indent_kind, input_type):
+def check_block(text, mode, input_type):
     """Run all selected rules on a single block of DTS text. Returns a
     list of (lineno, rule_name, message) tuples."""
     lines = classify_lines(text)
-    ctx = Ctx(lines, text, mode, indent_kind)
+    ctx = Ctx(lines, text, mode, input_type)
     rules = select_rules(mode, input_type)
     findings = []
     for r in rules:
@@ -1107,17 +1110,15 @@ def collect_findings(filepath, mode):
     formatted output strings; count is the number of findings."""
     kind = input_kind(filepath)
     if kind == 'yaml':
-        indent_kind = 'spaces'
         iterator = iter_yaml_examples(filepath)
     elif kind in DTS_FAMILY:
-        indent_kind = 'tab'
         iterator = iter_dts_file(filepath)
     else:
         return (['%s: unknown file type, skipping' % filepath], 0)
 
     out = []
     for text, base, idx in iterator:
-        for lineno, rule, msg in check_block(text, mode, indent_kind, kind):
+        for lineno, rule, msg in check_block(text, mode, kind):
             abs_line = base + lineno - 1
             ex_tag = '' if idx is None else ' example %d' % idx
             out.append('%s:%d:%s [%s] %s' %