tests: dt_binding_check: new test

tests/patch/dt_binding_check/dt_binding_check.sh

@@ -0,0 +1,86 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright 2025 NXP
+
+HEAD=$(git rev-parse HEAD)
+ncpu=$(grep -c processor /proc/cpuinfo)
+rc=0
+
+pr() {
+    echo " ====== $* ======" | tee -a /dev/stderr
+}
+
+build() {
+    make -j $ncpu DT_CHECKER_FLAGS=-m dt_binding_check 2>&1
+}
+
+# Only run this check if the patch touches DT binding files.
+if ! git show --diff-filter=AM --pretty="" --name-only "${HEAD}" | \
+    grep -q -E "^Documentation/devicetree/bindings/"
+then
+    echo "No DT binding files touched, skip" >&"$DESC_FD"
+    exit 0
+fi
+
+# Create temporary files for logs
+tmpfile_o_raw=$(mktemp)
+tmpfile_n_raw=$(mktemp)
+tmpfile_o_filtered=$(mktemp)
+tmpfile_n_filtered=$(mktemp)
+tmp_new_issues=$(mktemp)
+
+echo "Tree base:"
+git log -1 --pretty='%h ("%s")' HEAD~
+echo "Now at:"
+git log -1 --pretty='%h ("%s")' HEAD
+
+# Define the filter pattern to exclude build noise from the make output.
+# We only want to see the actual error/warning lines.
+FILTER_PATTERN="^(make\[|  CHKDT|  DTC|  DTEX|  HOSTCC|  HOSTLD|  LEX|  LINT|  SCHEMA|  YACC|$)"
+
+pr "Checking before the patch"
+git checkout -q HEAD~
+
+# Run the check on the parent commit
+(build | tee -a "$tmpfile_o_raw") || true
+
+# Filter and sort the output to get only relevant issue lines
+grep -v -E "$FILTER_PATTERN" "$tmpfile_o_raw" | sort > "$tmpfile_o_filtered"
+incumbent_total=$(wc -l < "$tmpfile_o_filtered")
+
+pr "Checking the tree with the patch"
+git checkout -q "$HEAD"
+
+# Run the check on the new commit
+(build | tee -a "$tmpfile_n_raw") || true
+
+# Filter and sort the output
+grep -v -E "$FILTER_PATTERN" "$tmpfile_n_raw" | sort > "$tmpfile_n_filtered"
+current_total=$(wc -l < "$tmpfile_n_filtered")
+
+# Compare the filtered lists to find new and fixed issues
+# Use comm to find fixed issues (lines only in the old log, column 1).
+fixed_issues_count=$(comm -23 "$tmpfile_o_filtered" "$tmpfile_n_filtered" | wc -l)
+
+# Use comm to find new issues (lines only in the new log, column 2)
+# and save them for later display.
+comm -13 "$tmpfile_o_filtered" "$tmpfile_n_filtered" > "$tmp_new_issues"
+new_issues_count=$(wc -l < "$tmp_new_issues")
+
+echo "Issues before: $incumbent_total, after: $current_total" \
+    "(Fixed: $fixed_issues_count, New: $new_issues_count)" >&"$DESC_FD"
+
+if [ "$new_issues_count" -gt 0 ]; then
+    echo "New issues added:" 1>&2
+    # Print the new issues we saved
+    cat "$tmp_new_issues" 1>&2
+    rc=1
+elif [ "$fixed_issues_count" -gt 0 ]; then
+    echo "Patch fixed $fixed_issues_count issue(s)." >&2
+    # No new issues, and some were fixed. This is a success.
+fi
+
+rm "$tmpfile_o_raw" "$tmpfile_n_raw" "$tmpfile_o_filtered" "$tmpfile_n_filtered" \
+    "$tmp_new_issues"
+
+exit $rc

tests/patch/dt_binding_check/info.json

@@ -0,0 +1,3 @@
+{
+  "run": ["dt_binding_check.sh"]
+}