[PATCH v3 6/6] dtc: dt-check-style: Handle properly DTC-style includes

[Krzysztof Kozlowski]

dt-check-style was not properly handling DTC directives (starting with
'/', e.g. /dts-v1/ or /include/), thus a few DTS files had false
positive like:

  apm/apm-merlin.dts:1: [indent-unit-dts] indent unit must be 1 tab in DTS, got '\t\t'

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxxxxxxxx>

---

Changes in v3:
New patch
---
 scripts/dtc/dt-check-style                         | 11 ++++--
 scripts/dtc/dt-style-selftest/good/dts-dtc.dts     | 20 +++++++++++
 .../dt-style-selftest/good/dts-preprocessor.dts    | 20 +++++++++++
 scripts/dtc/dt-style-selftest/good/soc.dtsi        | 40 ++++++++++++++++++++++
 4 files changed, 89 insertions(+), 2 deletions(-)

diff --git a/scripts/dtc/dt-check-style b/scripts/dtc/dt-check-style
index 3c1aa9e28347..b8ba6dbee86d 100755
--- a/scripts/dtc/dt-check-style
+++ b/scripts/dtc/dt-check-style
@@ -49,6 +49,9 @@ re_cpp_directive = re.compile(
     r'^#\s*(include|define|undef|ifdef|ifndef|if|else|elif|endif|'
     r'pragma|error|warning)\b')
 
+re_dtc_directive = re.compile(
+    r'^/(dts-v1|include)/[;\s]')
+
 # label: name@addr {  -- label and addr optional; name can be "/"
 # Per the DT spec a node name may start with a digit (e.g. 1wire@...).
 # The address part is captured loosely (any non-space, non-brace run) so
@@ -66,7 +69,11 @@ re_ref_node = re.compile(
 
 def is_preprocessor(stripped):
     """Tell C preprocessor directives apart from DTS '#'-prefixed props."""
-    return re_cpp_directive.match(stripped) is not None
+    if re_cpp_directive.match(stripped) is not None:
+        return True
+    if re_dtc_directive.match(stripped) is not None:
+        return True
+    return False
 
 
 class DtsLine:
@@ -178,7 +185,7 @@ def classify_lines(text):
             out.append(dl)
             continue
 
-        if stripped.startswith('#') and is_preprocessor(stripped):
+        if (stripped.startswith('#') or stripped.startswith('/')) and is_preprocessor(stripped):
             dl = DtsLine(i, raw, LineType.PREPROCESSOR,
                          indent_str, stripped)
             dl.depth = depth
diff --git a/scripts/dtc/dt-style-selftest/good/dts-dtc.dts b/scripts/dtc/dt-style-selftest/good/dts-dtc.dts
new file mode 100644
index 000000000000..4f249e9406c7
--- /dev/null
+++ b/scripts/dtc/dt-style-selftest/good/dts-dtc.dts
@@ -0,0 +1,20 @@
+// SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+/*
+ * Test fixture: dtc directive
+ */
+
+/dts-v1/;
+
+/include/ "soc.dtsi"
+
+/ {
+	compatible = "example,test-board";
+	#address-cells = <1>;
+	#size-cells = <1>;
+
+	leds {
+		led-0 {
+			compatible = "example,led";
+		};
+	};
+};
diff --git a/scripts/dtc/dt-style-selftest/good/dts-preprocessor.dts b/scripts/dtc/dt-style-selftest/good/dts-preprocessor.dts
new file mode 100644
index 000000000000..86cfd33086ee
--- /dev/null
+++ b/scripts/dtc/dt-style-selftest/good/dts-preprocessor.dts
@@ -0,0 +1,20 @@
+// SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+/*
+ * Test fixture: preprocessor directive
+ */
+
+/dts-v1/;
+
+#include "soc.dtsi"
+
+/ {
+	compatible = "example,test-board";
+	#address-cells = <1>;
+	#size-cells = <1>;
+
+	leds {
+		led-0 {
+			compatible = "example,led";
+		};
+	};
+};
diff --git a/scripts/dtc/dt-style-selftest/good/soc.dtsi b/scripts/dtc/dt-style-selftest/good/soc.dtsi
new file mode 100644
index 000000000000..af7477cb8e3d
--- /dev/null
+++ b/scripts/dtc/dt-style-selftest/good/soc.dtsi
@@ -0,0 +1,40 @@
+// SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+/ {
+	#address-cells = <1>;
+	#size-cells = <1>;
+
+	memory@a0000000 {
+		device_type = "memory";
+		reg = <0x0 0xa0000000 0x0 0x0>;
+	};
+
+	pmu {
+		compatible = "example,pmu";
+	};
+
+	soc@0 {
+		compatible = "simple-bus";
+		ranges = <0 0 0 0xc0000000>;
+
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		interrupt-controller@10000 {
+			compatible = "example,intc";
+			reg = <0x10000 0x1000>;
+			interrupts = <1 2 3>,
+				     <4 5 6>,
+				     <7 8 9>;
+		};
+
+		serial@20000 {
+			compatible = "example,serial";
+			reg = <0x20000 0x1000>;
+		};
+
+		serial@30000 {
+			compatible = "example,serial";
+			reg = <0x30000 0x1000>;
+		};
+	};
+};

-- 
2.53.0