linux-kernel - [PATCH 1/2] of/unittest: Add test that of_address_to_resource() fails on non-translatable address

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Message-ID: <20250110215030.3637845-1-robh@kernel.org>
Date: Fri, 10 Jan 2025 15:50:28 -0600
From: "Rob Herring (Arm)" <robh@...nel.org>
To: Michael Ellerman <mpe@...erman.id.au>,
	Saravana Kannan <saravanak@...gle.com>
Cc: linuxppc-dev@...ts.ozlabs.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] of/unittest: Add test that of_address_to_resource() fails on non-translatable address

of_address_to_resource() on a non-translatable address should return an
error. Additionally, this case also triggers a spurious WARN for
missing #address-cells/#size-cells.

Signed-off-by: Rob Herring (Arm) <robh@...nel.org>
---
 drivers/of/unittest-data/tests-platform.dtsi | 13 +++++++++++++
 drivers/of/unittest.c                        | 14 ++++++++++++++
 2 files changed, 27 insertions(+)

diff --git a/drivers/of/unittest-data/tests-platform.dtsi b/drivers/of/unittest-data/tests-platform.dtsi
index fa39611071b3..cd310b26b50c 100644
--- a/drivers/of/unittest-data/tests-platform.dtsi
+++ b/drivers/of/unittest-data/tests-platform.dtsi
@@ -34,5 +34,18 @@ dev@100 {
 				};
 			};
 		};
+
+		platform-tests-2 {
+			// No #address-cells or #size-cells
+			node {
+				#address-cells = <1>;
+				#size-cells = <1>;
+
+				test-device@100 {
+					compatible = "test-sub-device";
+					reg = <0x100 1>;
+				};
+			};
+		};
 	};
 };
diff --git a/drivers/of/unittest.c b/drivers/of/unittest.c
index 80483e38d7b4..34c957add8b9 100644
--- a/drivers/of/unittest.c
+++ b/drivers/of/unittest.c
@@ -1380,6 +1380,7 @@ static void __init of_unittest_bus_3cell_ranges(void)
 static void __init of_unittest_reg(void)
 {
 	struct device_node *np;
+	struct resource res;
 	int ret;
 	u64 addr, size;
 
@@ -1396,6 +1397,19 @@ static void __init of_unittest_reg(void)
 		np, addr);
 
 	of_node_put(np);
+
+	np = of_find_node_by_path("/testcase-data/platform-tests-2/node/test-device@100");
+	if (!np) {
+		pr_err("missing testcase data\n");
+		return;
+	}
+
+	ret = of_address_to_resource(np, 0, &res);
+	unittest(ret == -EINVAL, "of_address_to_resource(%pOF) expected error on untranslatable address\n",
+		 np);
+
+	of_node_put(np);
+
 }
 
 struct of_unittest_expected_res {
-- 
2.45.2