DT_CHECKER="${KMAKE} DT_CHECKER_FLAGS=-m dt_binding_check"
+# Remove leading whitespace to avoid the Makefile interpreting DT_SCHEMA_FILES
+# as empty like in this example:
+# ${DT_CHECKER} DT_SCHEMA_FILES= Documentation/devicetree/bindings...
+DT_SCHEMA_FILES=$(echo ${DT_SCHEMA_FILES} | xargs)
+
if [ x"${DT_SCHEMA_FILES}" != x"" ]; then
${DT_CHECKER} DT_SCHEMA_FILES=${DT_SCHEMA_FILES}
fi