scripts/dtc: Update to upstream version v1.6.0-2-g87a656ae5ff9

This adds the following commits from upstream:

87a656ae5ff9 check: Inform about missing ranges
73d6e9ecb417 libfdt: fix undefined behaviour in fdt_splice_()
2525da3dba9b Bump version to v1.6.0
62cb4ad286ff Execute tests on FreeBSD with Cirrus CI
1f9a41750883 tests: Allow running the testsuite on already installed binary / libraries
c5995ddf4c20 tests: Honour NO_YAML make variable
e4ce227e89d7 tests: Properly clean up .bak file from tests
9b75292c335c tests: Honour $(NO_PYTHON) flag from Makefile in run_tests.sh
6c253afd07d4 Encode $(NO_PYTHON) consistently with other variables
95ec8ef706bd tests: No need to explicitly pass $PYTHON from Make to run_tests.sh
2b5f62d109a2 tests: Let run_tests.sh run Python tests without Makefile assistance
76b43dcbd18a checks: Add 'dma-ranges' check
e5c92a4780c6 libfdt: Use VALID_INPUT for FDT_ERR_BADSTATE checks
e5cc26b68bc0 libfdt: Add support for disabling internal checks
28fd7590aad2 libfdt: Improve comments in some of the assumptions
fc207c32341b libfdt: Fix a few typos
0f61c72dedc4 libfdt: Allow exclusion of fdt_check_full()
f270f45fd5d2 libfdt: Add support for disabling ordering check/fixup
c18bae9a4c96 libfdt: Add support for disabling version checks
fc03c4a2e04e libfdt: Add support for disabling rollback handling
77563ae72b7c libfdt: Add support for disabling sanity checks
57bc6327b80b libfdt: Add support for disabling dtb checks
464962489dcc Add a way to control the level of checks in the code
0c5326cb2845 libfdt: De-inline fdt_header_size()
cc6a5a071504 Revert "yamltree: Ensure consistent bracketing of properties with phandles"
0e9225eb0dfe Remove redundant YYLOC global declaration
cab09eedd644 Move -DNO_VALGRIND into CPPFLAGS
0eb1cb0b531e Makefile: pass $(CFLAGS) also during dependency generation

Signed-off-by: Rob Herring <robh@kernel.org>
diff --git a/scripts/dtc/checks.c b/scripts/dtc/checks.c
index 756f0fa..4b3c486 100644
--- a/scripts/dtc/checks.c
+++ b/scripts/dtc/checks.c
@@ -352,7 +352,7 @@ static void check_unit_address_vs_reg(struct check *c, struct dt_info *dti,
 			FAIL(c, dti, node, "node has a reg or ranges property, but no unit name");
 	} else {
 		if (unitname[0])
-			FAIL(c, dti, node, "node has a unit name, but no reg property");
+			FAIL(c, dti, node, "node has a unit name, but no reg or ranges property");
 	}
 }
 WARNING(unit_address_vs_reg, check_unit_address_vs_reg, NULL);
@@ -765,13 +765,15 @@ static void check_ranges_format(struct check *c, struct dt_info *dti,
 {
 	struct property *prop;
 	int c_addr_cells, p_addr_cells, c_size_cells, p_size_cells, entrylen;
+	const char *ranges = c->data;
 
-	prop = get_property(node, "ranges");
+	prop = get_property(node, ranges);
 	if (!prop)
 		return;
 
 	if (!node->parent) {
-		FAIL_PROP(c, dti, node, prop, "Root node has a \"ranges\" property");
+		FAIL_PROP(c, dti, node, prop, "Root node has a \"%s\" property",
+			  ranges);
 		return;
 	}
 
@@ -783,23 +785,24 @@ static void check_ranges_format(struct check *c, struct dt_info *dti,
 
 	if (prop->val.len == 0) {
 		if (p_addr_cells != c_addr_cells)
-			FAIL_PROP(c, dti, node, prop, "empty \"ranges\" property but its "
+			FAIL_PROP(c, dti, node, prop, "empty \"%s\" property but its "
 				  "#address-cells (%d) differs from %s (%d)",
-				  c_addr_cells, node->parent->fullpath,
+				  ranges, c_addr_cells, node->parent->fullpath,
 				  p_addr_cells);
 		if (p_size_cells != c_size_cells)
-			FAIL_PROP(c, dti, node, prop, "empty \"ranges\" property but its "
+			FAIL_PROP(c, dti, node, prop, "empty \"%s\" property but its "
 				  "#size-cells (%d) differs from %s (%d)",
-				  c_size_cells, node->parent->fullpath,
+				  ranges, c_size_cells, node->parent->fullpath,
 				  p_size_cells);
 	} else if ((prop->val.len % entrylen) != 0) {
-		FAIL_PROP(c, dti, node, prop, "\"ranges\" property has invalid length (%d bytes) "
+		FAIL_PROP(c, dti, node, prop, "\"%s\" property has invalid length (%d bytes) "
 			  "(parent #address-cells == %d, child #address-cells == %d, "
-			  "#size-cells == %d)", prop->val.len,
+			  "#size-cells == %d)", ranges, prop->val.len,
 			  p_addr_cells, c_addr_cells, c_size_cells);
 	}
 }
-WARNING(ranges_format, check_ranges_format, NULL, &addr_size_cells);
+WARNING(ranges_format, check_ranges_format, "ranges", &addr_size_cells);
+WARNING(dma_ranges_format, check_ranges_format, "dma-ranges", &addr_size_cells);
 
 static const struct bus_type pci_bus = {
 	.name = "PCI",
@@ -1780,7 +1783,7 @@ static struct check *check_table[] = {
 	&property_name_chars_strict,
 	&node_name_chars_strict,
 
-	&addr_size_cells, &reg_format, &ranges_format,
+	&addr_size_cells, &reg_format, &ranges_format, &dma_ranges_format,
 
 	&unit_address_vs_reg,
 	&unit_address_format,