dtoc: Improve handling of reg properties

This existing code assumes that a reg property is larger than one cell,
but this is not always the case. Fix this assumption.

Also if a node's parent is missing the #address-cells and #size-cells
properties we use 2 as a default for each. But this should not happen in
practice. More likely the properties were removed for SPL due to there
being no 'u-boot,dm-pre-reloc' property, or similar. Add a warning for
this as the failure can be very confusing.

Signed-off-by: Simon Glass <sjg@chromium.org>

1 files changed, 30 insertions, 0 deletions

diff --git a/tools/dtoc/test/dtoc_test_single_reg.dts b/tools/dtoc/test/dtoc_test_single_reg.dts
new file mode 100644
index 0000000000..804b67855b
--- /dev/null
+++ b/tools/dtoc/test/dtoc_test_single_reg.dts
@@ -0,0 +1,30 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Test device tree file for dtoc
+ *
+ * Copyright 2017 Google, Inc
+ */
+
+/dts-v1/;
+
+/ {
+	#address-cells = <1>;
+	#size-cells = <1>;
+
+	i2c@0 {
+		compatible = "sandbox,i2c";
+		u-boot,dm-pre-reloc;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		pmic@9 {
+			compatible = "sandbox,pmic";
+			u-boot,dm-pre-reloc;
+			reg = <9>;
+			low-power;
+
+			gpio {
+				compatible = "sandbox,gpio";
+			};
+		};
+	};
+};