25 files changed, 675 insertions, 242 deletions

diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index 7234e61e7ce3..c9f975ab9840 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -280,9 +280,21 @@ DTC ?= $(objtree)/scripts/dtc/dtc
 
 # Disable noisy checks by default
 ifeq ($(KBUILD_ENABLE_EXTRA_GCC_CHECKS),)
-DTC_FLAGS += -Wno-unit_address_vs_reg
+DTC_FLAGS += -Wno-unit_address_vs_reg \
+	-Wno-simple_bus_reg \
+	-Wno-unit_address_format \
+	-Wno-pci_bridge \
+	-Wno-pci_device_bus_num \
+	-Wno-pci_device_reg
 endif
 
+ifeq ($(KBUILD_ENABLE_EXTRA_GCC_CHECKS),2)
+DTC_FLAGS += -Wnode_name_chars_strict \
+	-Wproperty_name_chars_strict
+endif
+
+DTC_FLAGS += $(DTC_FLAGS_$(basetarget))
+
 # Generate an assembly file to wrap the output of the device tree compiler
 quiet_cmd_dt_S_dtb= DTB     $@
 cmd_dt_S_dtb=						\
diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index baa3c7be04ad..4b9569fa931b 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -55,6 +55,7 @@ my $spelling_file = "$D/spelling.txt";
 my $codespell = 0;
 my $codespellfile = "/usr/share/codespell/dictionary.txt";
 my $conststructsfile = "$D/const_structs.checkpatch";
+my $typedefsfile = "";
 my $color = 1;
 my $allow_c99_comments = 1;
 
@@ -113,6 +114,7 @@ Options:
   --codespell                Use the codespell dictionary for spelling/typos
                              (default:/usr/share/codespell/dictionary.txt)
   --codespellfile            Use this codespell dictionary
+  --typedefsfile             Read additional types from this file
   --color                    Use colors when output is STDOUT (default: on)
   -h, --help, --version      display this help and exit
 
@@ -208,6 +210,7 @@ GetOptions(
 	'test-only=s'	=> \$tst_only,
 	'codespell!'	=> \$codespell,
 	'codespellfile=s'	=> \$codespellfile,
+	'typedefsfile=s'	=> \$typedefsfile,
 	'color!'	=> \$color,
 	'h|help'	=> \$help,
 	'version'	=> \$help
@@ -629,29 +632,44 @@ if ($codespell) {
 
 $misspellings = join("|", sort keys %spelling_fix) if keys %spelling_fix;
 
-my $const_structs = "";
-if (open(my $conststructs, '<', $conststructsfile)) {
-	while (<$conststructs>) {
-		my $line = $_;
+sub read_words {
+	my ($wordsRef, $file) = @_;
 
-		$line =~ s/\s*\n?$//g;
-		$line =~ s/^\s*//g;
+	if (open(my $words, '<', $file)) {
+		while (<$words>) {
+			my $line = $_;
 
-		next if ($line =~ m/^\s*#/);
-		next if ($line =~ m/^\s*$/);
-		if ($line =~ /\s/) {
-			print("$conststructsfile: '$line' invalid - ignored\n");
-			next;
-		}
+			$line =~ s/\s*\n?$//g;
+			$line =~ s/^\s*//g;
 
-		$const_structs .= '|' if ($const_structs ne "");
-		$const_structs .= $line;
+			next if ($line =~ m/^\s*#/);
+			next if ($line =~ m/^\s*$/);
+			if ($line =~ /\s/) {
+				print("$file: '$line' invalid - ignored\n");
+				next;
+			}
+
+			$$wordsRef .= '|' if ($$wordsRef ne "");
+			$$wordsRef .= $line;
+		}
+		close($file);
+		return 1;
 	}
-	close($conststructsfile);
-} else {
-	warn "No structs that should be const will be found - file '$conststructsfile': $!\n";
+
+	return 0;
 }
 
+my $const_structs = "";
+read_words(\$const_structs, $conststructsfile)
+    or warn "No structs that should be const will be found - file '$conststructsfile': $!\n";
+
+my $typeOtherTypedefs = "";
+if (length($typedefsfile)) {
+	read_words(\$typeOtherTypedefs, $typedefsfile)
+	    or warn "No additional types will be considered - file '$typedefsfile': $!\n";
+}
+$typeTypedefs .= '|' . $typeOtherTypedefs if ($typeOtherTypedefs ne "");
+
 sub build_types {
 	my $mods = "(?x:  \n" . join("|\n  ", (@modifierList, @modifierListFile)) . "\n)";
 	my $all = "(?x:  \n" . join("|\n  ", (@typeList, @typeListFile)) . "\n)";
@@ -2195,8 +2213,7 @@ sub process {
 			}
 			#next;
 		}
-		if ($rawline=~/^\@\@ -\d+(?:,\d+)? \+(\d+)(,(\d+))? \@\@(.*)/) {
-			my $context = $4;
+		if ($rawline =~ /^\@\@ -\d+(?:,\d+)? \+(\d+)(,(\d+))? \@\@/) {
 			$realline=$1-1;
 			if (defined $2) {
 				$realcnt=$3+1;
@@ -2205,12 +2222,6 @@ sub process {
 			}
 			$in_comment = 0;
 
-			if ($context =~ /\b(\w+)\s*\(/) {
-				$context_function = $1;
-			} else {
-				undef $context_function;
-			}
-
 			# Guestimate if this is a continuing comment.  Run
 			# the context looking for a comment "edge".  If this
 			# edge is a close comment then we must be in a comment
@@ -2281,7 +2292,8 @@ sub process {
 
 #extract the line range in the file after the patch is applied
 		if (!$in_commit_log &&
-		    $line =~ /^\@\@ -\d+(?:,\d+)? \+(\d+)(,(\d+))? \@\@/) {
+		    $line =~ /^\@\@ -\d+(?:,\d+)? \+(\d+)(,(\d+))? \@\@(.*)/) {
+			my $context = $4;
 			$is_patch = 1;
 			$first_line = $linenr + 1;
 			$realline=$1-1;
@@ -2297,6 +2309,11 @@ sub process {
 			%suppress_whiletrailers = ();
 			%suppress_export = ();
 			$suppress_statement = 0;
+			if ($context =~ /\b(\w+)\s*\(/) {
+				$context_function = $1;
+			} else {
+				undef $context_function;
+			}
 			next;
 
 # track the line number as we move through the hunk, note that
@@ -2539,6 +2556,7 @@ sub process {
 # Check for git id commit length and improperly formed commit descriptions
 		if ($in_commit_log && !$commit_log_possible_stack_dump &&
 		    $line !~ /^\s*(?:Link|Patchwork|http|https|BugLink):/i &&
+		    $line !~ /^This reverts commit [0-9a-f]{7,40}/ &&
 		    ($line =~ /\bcommit\s+[0-9a-f]{5,}\b/i ||
 		     ($line =~ /(?:\s|^)[0-9a-f]{12,40}(?:[\s"'\(\[]|$)/i &&
 		      $line !~ /[\<\[][0-9a-f]{12,40}[\>\]]/i &&
@@ -2628,8 +2646,8 @@ sub process {
 # Check if it's the start of a commit log
 # (not a header line and we haven't seen the patch filename)
 		if ($in_header_lines && $realfile =~ /^$/ &&
-		    !($rawline =~ /^\s+\S/ ||
-		      $rawline =~ /^(commit\b|from\b|[\w-]+:).*$/i)) {
+		    !($rawline =~ /^\s+(?:\S|$)/ ||
+		      $rawline =~ /^(?:commit\b|from\b|[\w-]+:)/i)) {
 			$in_header_lines = 0;
 			$in_commit_log = 1;
 			$has_commit_log = 1;
@@ -2757,13 +2775,6 @@ sub process {
 			#print "is_start<$is_start> is_end<$is_end> length<$length>\n";
 		}
 
-# discourage the addition of CONFIG_EXPERIMENTAL in Kconfig.
-		if ($realfile =~ /Kconfig/ &&
-		    $line =~ /.\s*depends on\s+.*\bEXPERIMENTAL\b/) {
-			WARN("CONFIG_EXPERIMENTAL",
-			     "Use of CONFIG_EXPERIMENTAL is deprecated. For alternatives, see https://lkml.org/lkml/2012/10/23/580\n");
-		}
-
 # discourage the use of boolean for type definition attributes of Kconfig options
 		if ($realfile =~ /Kconfig/ &&
 		    $line =~ /^\+\s*\bboolean\b/) {
@@ -3133,6 +3144,17 @@ sub process {
 # check we are in a valid C source file if not then ignore this hunk
 		next if ($realfile !~ /\.(h|c)$/);
 
+# check if this appears to be the start function declaration, save the name
+		if ($sline =~ /^\+\{\s*$/ &&
+		    $prevline =~ /^\+(?:(?:(?:$Storage|$Inline)\s*)*\s*$Type\s*)?($Ident)\(/) {
+			$context_function = $1;
+		}
+
+# check if this appears to be the end of function declaration
+		if ($sline =~ /^\+\}\s*$/) {
+			undef $context_function;
+		}
+
 # check indentation of any line with a bare else
 # (but not if it is a multiple line "if (foo) return bar; else return baz;")
 # if the previous line is a break or return and is indented 1 tab more...
@@ -3157,12 +3179,6 @@ sub process {
 			}
 		}
 
-# discourage the addition of CONFIG_EXPERIMENTAL in #if(def).
-		if ($line =~ /^\+\s*\#\s*if.*\bCONFIG_EXPERIMENTAL\b/) {
-			WARN("CONFIG_EXPERIMENTAL",
-			     "Use of CONFIG_EXPERIMENTAL is deprecated. For alternatives, see https://lkml.org/lkml/2012/10/23/580\n");
-		}
-
 # check for RCS/CVS revision markers
 		if ($rawline =~ /^\+.*\$(Revision|Log|Id)(?:\$|)/) {
 			WARN("CVS_KEYWORD",
@@ -3338,7 +3354,7 @@ sub process {
 		}
 
 # Check relative indent for conditionals and blocks.
-		if ($line =~ /\b(?:(?:if|while|for|(?:[a-z_]+|)for_each[a-z_]+)\s*\(|do\b)/ && $line !~ /^.\s*#/ && $line !~ /\}\s*while\s*/) {
+		if ($line =~ /\b(?:(?:if|while|for|(?:[a-z_]+|)for_each[a-z_]+)\s*\(|(?:do|else)\b)/ && $line !~ /^.\s*#/ && $line !~ /\}\s*while\s*/) {
 			($stat, $cond, $line_nr_next, $remain_next, $off_next) =
 				ctx_statement_block($linenr, $realcnt, 0)
 					if (!defined $stat);
@@ -3430,6 +3446,8 @@ sub process {
 			if ($check && $s ne '' &&
 			    (($sindent % 8) != 0 ||
 			     ($sindent < $indent) ||
+			     ($sindent == $indent &&
+			      ($s !~ /^\s*(?:\}|\{|else\b)/)) ||
 			     ($sindent > $indent + 8))) {
 				WARN("SUSPECT_CODE_INDENT",
 				     "suspect code indent for conditional statements ($indent, $sindent)\n" . $herecurr . "$stat_real\n");
@@ -4851,8 +4869,10 @@ sub process {
 			    $dstat !~ /^\(\{/ &&						# ({...
 			    $ctx !~ /^.\s*#\s*define\s+TRACE_(?:SYSTEM|INCLUDE_FILE|INCLUDE_PATH)\b/)
 			{
-
-				if ($dstat =~ /;/) {
+				if ($dstat =~ /^\s*if\b/) {
+					ERROR("MULTISTATEMENT_MACRO_USE_DO_WHILE",
+					      "Macros starting with if should be enclosed by a do - while loop to avoid possible if/else logic defects\n" . "$herectx");
+				} elsif ($dstat =~ /;/) {
 					ERROR("MULTISTATEMENT_MACRO_USE_DO_WHILE",
 					      "Macros with multiple statements should be enclosed in a do - while loop\n" . "$herectx");
 				} else {
@@ -5174,14 +5194,16 @@ sub process {
 			     "break quoted strings at a space character\n" . $hereprev);
 		}
 
-#check for an embedded function name in a string when the function is known
-# as part of a diff.  This does not work for -f --file checking as it
-#depends on patch context providing the function name
+# check for an embedded function name in a string when the function is known
+# This does not work very well for -f --file checking as it depends on patch
+# context providing the function name or a single line form for in-file
+# function declarations
 		if ($line =~ /^\+.*$String/ &&
 		    defined($context_function) &&
-		    get_quoted_string($line, $rawline) =~ /\b$context_function\b/) {
+		    get_quoted_string($line, $rawline) =~ /\b$context_function\b/ &&
+		    length(get_quoted_string($line, $rawline)) != (length($context_function) + 2)) {
 			WARN("EMBEDDED_FUNCTION_NAME",
-			     "Prefer using \"%s\", __func__ to embedded function names\n" . $herecurr);
+			     "Prefer using '\"%s...\", __func__' to using '$context_function', this function's name, in a string\n" . $herecurr);
 		}
 
 # check for spaces before a quoted newline
@@ -5676,6 +5698,32 @@ sub process {
 			}
 		}
 
+		# check for vsprintf extension %p<foo> misuses
+		if ($^V && $^V ge 5.10.0 &&
+		    defined $stat &&
+		    $stat =~ /^\+(?![^\{]*\{\s*).*\b(\w+)\s*\(.*$String\s*,/s &&
+		    $1 !~ /^_*volatile_*$/) {
+			my $bad_extension = "";
+			my $lc = $stat =~ tr@\n@@;
+			$lc = $lc + $linenr;
+		        for (my $count = $linenr; $count <= $lc; $count++) {
+				my $fmt = get_quoted_string($lines[$count - 1], raw_line($count, 0));
+				$fmt =~ s/%%//g;
+				if ($fmt =~ /(\%[\*\d\.]*p(?![\WFfSsBKRraEhMmIiUDdgVCbGN]).)/) {
+					$bad_extension = $1;
+					last;
+				}
+			}
+			if ($bad_extension ne "") {
+				my $stat_real = raw_line($linenr, 0);
+				for (my $count = $linenr + 1; $count <= $lc; $count++) {
+					$stat_real = $stat_real . "\n" . raw_line($count, 0);
+				}
+				WARN("VSPRINTF_POINTER_EXTENSION",
+				     "Invalid vsprintf pointer extension '$bad_extension'\n" . "$here\n$stat_real\n");
+			}
+		}
+
 # Check for misused memsets
 		if ($^V && $^V ge 5.10.0 &&
 		    defined $stat &&
@@ -5893,7 +5941,8 @@ sub process {
 
 # check for k[mz]alloc with multiplies that could be kmalloc_array/kcalloc
 		if ($^V && $^V ge 5.10.0 &&
-		    $line =~ /\b($Lval)\s*\=\s*(?:$balanced_parens)?\s*(k[mz]alloc)\s*\(\s*($FuncArg)\s*\*\s*($FuncArg)\s*,/) {
+		    defined $stat &&
+		    $stat =~ /^\+\s*($Lval)\s*\=\s*(?:$balanced_parens)?\s*(k[mz]alloc)\s*\(\s*($FuncArg)\s*\*\s*($FuncArg)\s*,/) {
 			my $oldfunc = $3;
 			my $a1 = $4;
 			my $a2 = $10;
@@ -5907,11 +5956,17 @@ sub process {
 			}
 			if ($r1 !~ /^sizeof\b/ && $r2 =~ /^sizeof\s*\S/ &&
 			    !($r1 =~ /^$Constant$/ || $r1 =~ /^[A-Z_][A-Z0-9_]*$/)) {
+				my $ctx = '';
+				my $herectx = $here . "\n";
+				my $cnt = statement_rawlines($stat);
+				for (my $n = 0; $n < $cnt; $n++) {
+					$herectx .= raw_line($linenr, $n) . "\n";
+				}
 				if (WARN("ALLOC_WITH_MULTIPLY",
-					 "Prefer $newfunc over $oldfunc with multiply\n" . $herecurr) &&
+					 "Prefer $newfunc over $oldfunc with multiply\n" . $herectx) &&
+				    $cnt == 1 &&
 				    $fix) {
 					$fixed[$fixlinenr] =~ s/\b($Lval)\s*\=\s*(?:$balanced_parens)?\s*(k[mz]alloc)\s*\(\s*($FuncArg)\s*\*\s*($FuncArg)/$1 . ' = ' . "$newfunc(" . trim($r1) . ', ' . trim($r2)/e;
-
 				}
 			}
 		}
@@ -6066,11 +6121,11 @@ sub process {
 		}
 
 # check for various structs that are normally const (ops, kgdb, device_tree)
+# and avoid what seem like struct definitions 'struct foo {'
 		if ($line !~ /\bconst\b/ &&
-		    $line =~ /\bstruct\s+($const_structs)\b/) {
+		    $line =~ /\bstruct\s+($const_structs)\b(?!\s*\{)/) {
 			WARN("CONST_STRUCT",
-			     "struct $1 should normally be const\n" .
-				$herecurr);
+			     "struct $1 should normally be const\n" . $herecurr);
 		}
 
 # use of NR_CPUS is usually wrong
diff --git a/scripts/dtc/checks.c b/scripts/dtc/checks.c
index 3d18e45374c8..5adfc8f52b4f 100644
--- a/scripts/dtc/checks.c
+++ b/scripts/dtc/checks.c
@@ -72,17 +72,16 @@ struct check {
 #define CHECK(_nm, _fn, _d, ...) \
 	CHECK_ENTRY(_nm, _fn, _d, false, false, __VA_ARGS__)
 
-#ifdef __GNUC__
-static inline void check_msg(struct check *c, const char *fmt, ...) __attribute__((format (printf, 2, 3)));
-#endif
-static inline void check_msg(struct check *c, const char *fmt, ...)
+static inline void  PRINTF(3, 4) check_msg(struct check *c, struct dt_info *dti,
+					   const char *fmt, ...)
 {
 	va_list ap;
 	va_start(ap, fmt);
 
 	if ((c->warn && (quiet < 1))
 	    || (c->error && (quiet < 2))) {
-		fprintf(stderr, "%s (%s): ",
+		fprintf(stderr, "%s: %s (%s): ",
+			strcmp(dti->outname, "-") ? dti->outname : "<stdout>",
 			(c->error) ? "ERROR" : "Warning", c->name);
 		vfprintf(stderr, fmt, ap);
 		fprintf(stderr, "\n");
@@ -90,11 +89,11 @@ static inline void check_msg(struct check *c, const char *fmt, ...)
 	va_end(ap);
 }
 
-#define FAIL(c, ...) \
-	do { \
-		TRACE((c), "\t\tFAILED at %s:%d", __FILE__, __LINE__); \
-		(c)->status = FAILED; \
-		check_msg((c), __VA_ARGS__); \
+#define FAIL(c, dti, ...)						\
+	do {								\
+		TRACE((c), "\t\tFAILED at %s:%d", __FILE__, __LINE__);	\
+		(c)->status = FAILED;					\
+		check_msg((c), dti, __VA_ARGS__);			\
 	} while (0)
 
 static void check_nodes_props(struct check *c, struct dt_info *dti, struct node *node)
@@ -127,7 +126,7 @@ static bool run_check(struct check *c, struct dt_info *dti)
 		error = error || run_check(prq, dti);
 		if (prq->status != PASSED) {
 			c->status = PREREQ;
-			check_msg(c, "Failed prerequisite '%s'",
+			check_msg(c, dti, "Failed prerequisite '%s'",
 				  c->prereq[i]->name);
 		}
 	}
@@ -157,7 +156,7 @@ out:
 static inline void check_always_fail(struct check *c, struct dt_info *dti,
 				     struct node *node)
 {
-	FAIL(c, "always_fail check");
+	FAIL(c, dti, "always_fail check");
 }
 CHECK(always_fail, check_always_fail, NULL);
 
@@ -172,7 +171,7 @@ static void check_is_string(struct check *c, struct dt_info *dti,
 		return; /* Not present, assumed ok */
 
 	if (!data_is_one_string(prop->val))
-		FAIL(c, "\"%s\" property in %s is not a string",
+		FAIL(c, dti, "\"%s\" property in %s is not a string",
 		     propname, node->fullpath);
 }
 #define WARNING_IF_NOT_STRING(nm, propname) \
@@ -191,7 +190,7 @@ static void check_is_cell(struct check *c, struct dt_info *dti,
 		return; /* Not present, assumed ok */
 
 	if (prop->val.len != sizeof(cell_t))
-		FAIL(c, "\"%s\" property in %s is not a single cell",
+		FAIL(c, dti, "\"%s\" property in %s is not a single cell",
 		     propname, node->fullpath);
 }
 #define WARNING_IF_NOT_CELL(nm, propname) \
@@ -213,7 +212,7 @@ static void check_duplicate_node_names(struct check *c, struct dt_info *dti,
 		     child2;
 		     child2 = child2->next_sibling)
 			if (streq(child->name, child2->name))
-				FAIL(c, "Duplicate node name %s",
+				FAIL(c, dti, "Duplicate node name %s",
 				     child->fullpath);
 }
 ERROR(duplicate_node_names, check_duplicate_node_names, NULL);
@@ -228,7 +227,7 @@ static void check_duplicate_property_names(struct check *c, struct dt_info *dti,
 			if (prop2->deleted)
 				continue;
 			if (streq(prop->name, prop2->name))
-				FAIL(c, "Duplicate property name %s in %s",
+				FAIL(c, dti, "Duplicate property name %s in %s",
 				     prop->name, node->fullpath);
 		}
 	}
@@ -239,6 +238,7 @@ ERROR(duplicate_property_names, check_duplicate_property_names, NULL);
 #define UPPERCASE	"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
 #define DIGITS		"0123456789"
 #define PROPNODECHARS	LOWERCASE UPPERCASE DIGITS ",._+*#?-"
+#define PROPNODECHARSSTRICT	LOWERCASE UPPERCASE DIGITS ",-"
 
 static void check_node_name_chars(struct check *c, struct dt_info *dti,
 				  struct node *node)
@@ -246,16 +246,27 @@ static void check_node_name_chars(struct check *c, struct dt_info *dti,
 	int n = strspn(node->name, c->data);
 
 	if (n < strlen(node->name))
-		FAIL(c, "Bad character '%c' in node %s",
+		FAIL(c, dti, "Bad character '%c' in node %s",
 		     node->name[n], node->fullpath);
 }
 ERROR(node_name_chars, check_node_name_chars, PROPNODECHARS "@");
 
+static void check_node_name_chars_strict(struct check *c, struct dt_info *dti,
+					 struct node *node)
+{
+	int n = strspn(node->name, c->data);
+
+	if (n < node->basenamelen)
+		FAIL(c, dti, "Character '%c' not recommended in node %s",
+		     node->name[n], node->fullpath);
+}
+CHECK(node_name_chars_strict, check_node_name_chars_strict, PROPNODECHARSSTRICT);
+
 static void check_node_name_format(struct check *c, struct dt_info *dti,
 				   struct node *node)
 {
 	if (strchr(get_unitname(node), '@'))
-		FAIL(c, "Node %s has multiple '@' characters in name",
+		FAIL(c, dti, "Node %s has multiple '@' characters in name",
 		     node->fullpath);
 }
 ERROR(node_name_format, check_node_name_format, NULL, &node_name_chars);
@@ -274,11 +285,11 @@ static void check_unit_address_vs_reg(struct check *c, struct dt_info *dti,
 
 	if (prop) {
 		if (!unitname[0])
-			FAIL(c, "Node %s has a reg or ranges property, but no unit name",
+			FAIL(c, dti, "Node %s has a reg or ranges property, but no unit name",
 			    node->fullpath);
 	} else {
 		if (unitname[0])
-			FAIL(c, "Node %s has a unit name, but no reg property",
+			FAIL(c, dti, "Node %s has a unit name, but no reg property",
 			    node->fullpath);
 	}
 }
@@ -293,12 +304,44 @@ static void check_property_name_chars(struct check *c, struct dt_info *dti,
 		int n = strspn(prop->name, c->data);
 
 		if (n < strlen(prop->name))
-			FAIL(c, "Bad character '%c' in property name \"%s\", node %s",
+			FAIL(c, dti, "Bad character '%c' in property name \"%s\", node %s",
 			     prop->name[n], prop->name, node->fullpath);
 	}
 }
 ERROR(property_name_chars, check_property_name_chars, PROPNODECHARS);
 
+static void check_property_name_chars_strict(struct check *c,
+					     struct dt_info *dti,
+					     struct node *node)
+{
+	struct property *prop;
+
+	for_each_property(node, prop) {
+		const char *name = prop->name;
+		int n = strspn(name, c->data);
+
+		if (n == strlen(prop->name))
+			continue;
+
+		/* Certain names are whitelisted */
+		if (streq(name, "device_type"))
+			continue;
+
+		/*
+		 * # is only allowed at the beginning of property names not counting
+		 * the vendor prefix.
+		 */
+		if (name[n] == '#' && ((n == 0) || (name[n-1] == ','))) {
+			name += n + 1;
+			n = strspn(name, c->data);
+		}
+		if (n < strlen(name))
+			FAIL(c, dti, "Character '%c' not recommended in property name \"%s\", node %s",
+			     name[n], prop->name, node->fullpath);
+	}
+}
+CHECK(property_name_chars_strict, check_property_name_chars_strict, PROPNODECHARSSTRICT);
+
 #define DESCLABEL_FMT	"%s%s%s%s%s"
 #define DESCLABEL_ARGS(node,prop,mark)		\
 	((mark) ? "value of " : ""),		\
@@ -327,7 +370,7 @@ static void check_duplicate_label(struct check *c, struct dt_info *dti,
 		return;
 
 	if ((othernode != node) || (otherprop != prop) || (othermark != mark))
-		FAIL(c, "Duplicate label '%s' on " DESCLABEL_FMT
+		FAIL(c, dti, "Duplicate label '%s' on " DESCLABEL_FMT
 		     " and " DESCLABEL_FMT,
 		     label, DESCLABEL_ARGS(node, prop, mark),
 		     DESCLABEL_ARGS(othernode, otherprop, othermark));
@@ -367,7 +410,7 @@ static cell_t check_phandle_prop(struct check *c, struct dt_info *dti,
 		return 0;
 
 	if (prop->val.len != sizeof(cell_t)) {
-		FAIL(c, "%s has bad length (%d) %s property",
+		FAIL(c, dti, "%s has bad length (%d) %s property",
 		     node->fullpath, prop->val.len, prop->name);
 		return 0;
 	}
@@ -379,7 +422,7 @@ static cell_t check_phandle_prop(struct check *c, struct dt_info *dti,
 			/* "Set this node's phandle equal to some
 			 * other node's phandle".  That's nonsensical
 			 * by construction. */ {
-			FAIL(c, "%s in %s is a reference to another node",
+			FAIL(c, dti, "%s in %s is a reference to another node",
 			     prop->name, node->fullpath);
 		}
 		/* But setting this node's phandle equal to its own
@@ -393,7 +436,7 @@ static cell_t check_phandle_prop(struct check *c, struct dt_info *dti,
 	phandle = propval_cell(prop);
 
 	if ((phandle == 0) || (phandle == -1)) {
-		FAIL(c, "%s has bad value (0x%x) in %s property",
+		FAIL(c, dti, "%s has bad value (0x%x) in %s property",
 		     node->fullpath, phandle, prop->name);
 		return 0;
 	}
@@ -420,7 +463,7 @@ static void check_explicit_phandles(struct check *c, struct dt_info *dti,
 		return;
 
 	if (linux_phandle && phandle && (phandle != linux_phandle))
-		FAIL(c, "%s has mismatching 'phandle' and 'linux,phandle'"
+		FAIL(c, dti, "%s has mismatching 'phandle' and 'linux,phandle'"
 		     " properties", node->fullpath);
 
 	if (linux_phandle && !phandle)
@@ -428,7 +471,7 @@ static void check_explicit_phandles(struct check *c, struct dt_info *dti,
 
 	other = get_node_by_phandle(root, phandle);
 	if (other && (other != node)) {
-		FAIL(c, "%s has duplicated phandle 0x%x (seen before at %s)",
+		FAIL(c, dti, "%s has duplicated phandle 0x%x (seen before at %s)",
 		     node->fullpath, phandle, other->fullpath);
 		return;
 	}
@@ -453,7 +496,7 @@ static void check_name_properties(struct check *c, struct dt_info *dti,
 
 	if ((prop->val.len != node->basenamelen+1)
 	    || (memcmp(prop->val.val, node->name, node->basenamelen) != 0)) {
-		FAIL(c, "\"name\" property in %s is incorrect (\"%s\" instead"
+		FAIL(c, dti, "\"name\" property in %s is incorrect (\"%s\" instead"
 		     " of base node name)", node->fullpath, prop->val.val);
 	} else {
 		/* The name property is correct, and therefore redundant.
@@ -488,16 +531,16 @@ static void fixup_phandle_references(struct check *c, struct dt_info *dti,
 			refnode = get_node_by_ref(dt, m->ref);
 			if (! refnode) {
 				if (!(dti->dtsflags & DTSF_PLUGIN))
-					FAIL(c, "Reference to non-existent node or "
+					FAIL(c, dti, "Reference to non-existent node or "
 							"label \"%s\"\n", m->ref);
 				else /* mark the entry as unresolved */
-					*((cell_t *)(prop->val.val + m->offset)) =
+					*((fdt32_t *)(prop->val.val + m->offset)) =
 						cpu_to_fdt32(0xffffffff);
 				continue;
 			}
 
 			phandle = get_node_phandle(dt, refnode);
-			*((cell_t *)(prop->val.val + m->offset)) = cpu_to_fdt32(phandle);
+			*((fdt32_t *)(prop->val.val + m->offset)) = cpu_to_fdt32(phandle);
 		}
 	}
 }
@@ -520,7 +563,7 @@ static void fixup_path_references(struct check *c, struct dt_info *dti,
 
 			refnode = get_node_by_ref(dt, m->ref);
 			if (!refnode) {
-				FAIL(c, "Reference to non-existent node or label \"%s\"\n",
+				FAIL(c, dti, "Reference to non-existent node or label \"%s\"\n",
 				     m->ref);
 				continue;
 			}
@@ -579,19 +622,19 @@ static void check_reg_format(struct check *c, struct dt_info *dti,
 		return; /* No "reg", that's fine */
 
 	if (!node->parent) {
-		FAIL(c, "Root node has a \"reg\" property");
+		FAIL(c, dti, "Root node has a \"reg\" property");
 		return;
 	}
 
 	if (prop->val.len == 0)
-		FAIL(c, "\"reg\" property in %s is empty", node->fullpath);
+		FAIL(c, dti, "\"reg\" property in %s is empty", node->fullpath);
 
 	addr_cells = node_addr_cells(node->parent);
 	size_cells = node_size_cells(node->parent);
 	entrylen = (addr_cells + size_cells) * sizeof(cell_t);
 
 	if (!entrylen || (prop->val.len % entrylen) != 0)
-		FAIL(c, "\"reg\" property in %s has invalid length (%d bytes) "
+		FAIL(c, dti, "\"reg\" property in %s has invalid length (%d bytes) "
 		     "(#address-cells == %d, #size-cells == %d)",
 		     node->fullpath, prop->val.len, addr_cells, size_cells);
 }
@@ -608,7 +651,7 @@ static void check_ranges_format(struct check *c, struct dt_info *dti,
 		return;
 
 	if (!node->parent) {
-		FAIL(c, "Root node has a \"ranges\" property");
+		FAIL(c, dti, "Root node has a \"ranges\" property");
 		return;
 	}
 
@@ -620,17 +663,17 @@ 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(c, "%s has empty \"ranges\" property but its "
+			FAIL(c, dti, "%s has empty \"ranges\" property but its "
 			     "#address-cells (%d) differs from %s (%d)",
 			     node->fullpath, c_addr_cells, node->parent->fullpath,
 			     p_addr_cells);
 		if (p_size_cells != c_size_cells)
-			FAIL(c, "%s has empty \"ranges\" property but its "
+			FAIL(c, dti, "%s has empty \"ranges\" property but its "
 			     "#size-cells (%d) differs from %s (%d)",
 			     node->fullpath, c_size_cells, node->parent->fullpath,
 			     p_size_cells);
 	} else if ((prop->val.len % entrylen) != 0) {
-		FAIL(c, "\"ranges\" property in %s has invalid length (%d bytes) "
+		FAIL(c, dti, "\"ranges\" property in %s has invalid length (%d bytes) "
 		     "(parent #address-cells == %d, child #address-cells == %d, "
 		     "#size-cells == %d)", node->fullpath, prop->val.len,
 		     p_addr_cells, c_addr_cells, c_size_cells);
@@ -638,6 +681,229 @@ static void check_ranges_format(struct check *c, struct dt_info *dti,
 }
 WARNING(ranges_format, check_ranges_format, NULL, &addr_size_cells);
 
+static const struct bus_type pci_bus = {
+	.name = "PCI",
+};
+
+static void check_pci_bridge(struct check *c, struct dt_info *dti, struct node *node)
+{
+	struct property *prop;
+	cell_t *cells;
+
+	prop = get_property(node, "device_type");
+	if (!prop || !streq(prop->val.val, "pci"))
+		return;
+
+	node->bus = &pci_bus;
+
+	if (!strneq(node->name, "pci", node->basenamelen) &&
+	    !strneq(node->name, "pcie", node->basenamelen))
+		FAIL(c, dti, "Node %s node name is not \"pci\" or \"pcie\"",
+			     node->fullpath);
+
+	prop = get_property(node, "ranges");
+	if (!prop)
+		FAIL(c, dti, "Node %s missing ranges for PCI bridge (or not a bridge)",
+			     node->fullpath);
+
+	if (node_addr_cells(node) != 3)
+		FAIL(c, dti, "Node %s incorrect #address-cells for PCI bridge",
+			     node->fullpath);
+	if (node_size_cells(node) != 2)
+		FAIL(c, dti, "Node %s incorrect #size-cells for PCI bridge",
+			     node->fullpath);
+
+	prop = get_property(node, "bus-range");
+	if (!prop) {
+		FAIL(c, dti, "Node %s missing bus-range for PCI bridge",
+			     node->fullpath);
+		return;
+	}
+	if (prop->val.len != (sizeof(cell_t) * 2)) {
+		FAIL(c, dti, "Node %s bus-range must be 2 cells",
+			     node->fullpath);
+		return;
+	}
+	cells = (cell_t *)prop->val.val;
+	if (fdt32_to_cpu(cells[0]) > fdt32_to_cpu(cells[1]))
+		FAIL(c, dti, "Node %s bus-range 1st cell must be less than or equal to 2nd cell",
+			     node->fullpath);
+	if (fdt32_to_cpu(cells[1]) > 0xff)
+		FAIL(c, dti, "Node %s bus-range maximum bus number must be less than 256",
+			     node->fullpath);
+}
+WARNING(pci_bridge, check_pci_bridge, NULL,
+	&device_type_is_string, &addr_size_cells);
+
+static void check_pci_device_bus_num(struct check *c, struct dt_info *dti, struct node *node)
+{
+	struct property *prop;
+	unsigned int bus_num, min_bus, max_bus;
+	cell_t *cells;
+
+	if (!node->parent || (node->parent->bus != &pci_bus))
+		return;
+
+	prop = get_property(node, "reg");
+	if (!prop)
+		return;
+
+	cells = (cell_t *)prop->val.val;
+	bus_num = (fdt32_to_cpu(cells[0]) & 0x00ff0000) >> 16;
+
+	prop = get_property(node->parent, "bus-range");
+	if (!prop) {
+		min_bus = max_bus = 0;
+	} else {
+		cells = (cell_t *)prop->val.val;
+		min_bus = fdt32_to_cpu(cells[0]);
+		max_bus = fdt32_to_cpu(cells[0]);
+	}
+	if ((bus_num < min_bus) || (bus_num > max_bus))
+		FAIL(c, dti, "Node %s PCI bus number %d out of range, expected (%d - %d)",
+		     node->fullpath, bus_num, min_bus, max_bus);
+}
+WARNING(pci_device_bus_num, check_pci_device_bus_num, NULL, &reg_format, &pci_bridge);
+
+static void check_pci_device_reg(struct check *c, struct dt_info *dti, struct node *node)
+{
+	struct property *prop;
+	const char *unitname = get_unitname(node);
+	char unit_addr[5];
+	unsigned int dev, func, reg;
+	cell_t *cells;
+
+	if (!node->parent || (node->parent->bus != &pci_bus))
+		return;
+
+	prop = get_property(node, "reg");
+	if (!prop) {
+		FAIL(c, dti, "Node %s missing PCI reg property", node->fullpath);
+		return;
+	}
+
+	cells = (cell_t *)prop->val.val;
+	if (cells[1] || cells[2])
+		FAIL(c, dti, "Node %s PCI reg config space address cells 2 and 3 must be 0",
+			     node->fullpath);
+
+	reg = fdt32_to_cpu(cells[0]);
+	dev = (reg & 0xf800) >> 11;
+	func = (reg & 0x700) >> 8;
+
+	if (reg & 0xff000000)
+		FAIL(c, dti, "Node %s PCI reg address is not configuration space",
+			     node->fullpath);
+	if (reg & 0x000000ff)
+		FAIL(c, dti, "Node %s PCI reg config space address register number must be 0",
+			     node->fullpath);
+
+	if (func == 0) {
+		snprintf(unit_addr, sizeof(unit_addr), "%x", dev);
+		if (streq(unitname, unit_addr))
+			return;
+	}
+
+	snprintf(unit_addr, sizeof(unit_addr), "%x,%x", dev, func);
+	if (streq(unitname, unit_addr))
+		return;
+
+	FAIL(c, dti, "Node %s PCI unit address format error, expected \"%s\"",
+	     node->fullpath, unit_addr);
+}
+WARNING(pci_device_reg, check_pci_device_reg, NULL, &reg_format, &pci_bridge);
+
+static const struct bus_type simple_bus = {
+	.name = "simple-bus",
+};
+
+static bool node_is_compatible(struct node *node, const char *compat)
+{
+	struct property *prop;
+	const char *str, *end;
+
+	prop = get_property(node, "compatible");
+	if (!prop)
+		return false;
+
+	for (str = prop->val.val, end = str + prop->val.len; str < end;
+	     str += strnlen(str, end - str) + 1) {
+		if (strneq(str, compat, end - str))
+			return true;
+	}
+	return false;
+}
+
+static void check_simple_bus_bridge(struct check *c, struct dt_info *dti, struct node *node)
+{
+	if (node_is_compatible(node, "simple-bus"))
+		node->bus = &simple_bus;
+}
+WARNING(simple_bus_bridge, check_simple_bus_bridge, NULL, &addr_size_cells);
+
+static void check_simple_bus_reg(struct check *c, struct dt_info *dti, struct node *node)
+{
+	struct property *prop;
+	const char *unitname = get_unitname(node);
+	char unit_addr[17];
+	unsigned int size;
+	uint64_t reg = 0;
+	cell_t *cells = NULL;
+
+	if (!node->parent || (node->parent->bus != &simple_bus))
+		return;
+
+	prop = get_property(node, "reg");
+	if (prop)
+		cells = (cell_t *)prop->val.val;
+	else {
+		prop = get_property(node, "ranges");
+		if (prop && prop->val.len)
+			/* skip of child address */
+			cells = ((cell_t *)prop->val.val) + node_addr_cells(node);
+	}
+
+	if (!cells) {
+		if (node->parent->parent && !(node->bus == &simple_bus))
+			FAIL(c, dti, "Node %s missing or empty reg/ranges property", node->fullpath);
+		return;
+	}
+
+	size = node_addr_cells(node->parent);
+	while (size--)
+		reg = (reg << 32) | fdt32_to_cpu(*(cells++));
+
+	snprintf(unit_addr, sizeof(unit_addr), "%lx", reg);
+	if (!streq(unitname, unit_addr))
+		FAIL(c, dti, "Node %s simple-bus unit address format error, expected \"%s\"",
+		     node->fullpath, unit_addr);
+}
+WARNING(simple_bus_reg, check_simple_bus_reg, NULL, &reg_format, &simple_bus_bridge);
+
+static void check_unit_address_format(struct check *c, struct dt_info *dti,
+				      struct node *node)
+{
+	const char *unitname = get_unitname(node);
+
+	if (node->parent && node->parent->bus)
+		return;
+
+	if (!unitname[0])
+		return;
+
+	if (!strncmp(unitname, "0x", 2)) {
+		FAIL(c, dti, "Node %s unit name should not have leading \"0x\"",
+		    node->fullpath);
+		/* skip over 0x for next test */
+		unitname += 2;
+	}
+	if (unitname[0] == '0' && isxdigit(unitname[1]))
+		FAIL(c, dti, "Node %s unit name should not have leading 0s",
+		    node->fullpath);
+}
+WARNING(unit_address_format, check_unit_address_format, NULL,
+	&node_name_format, &pci_bridge, &simple_bus_bridge);
+
 /*
  * Style checks
  */
@@ -656,11 +922,11 @@ static void check_avoid_default_addr_size(struct check *c, struct dt_info *dti,
 		return;
 
 	if (node->parent->addr_cells == -1)
-		FAIL(c, "Relying on default #address-cells value for %s",
+		FAIL(c, dti, "Relying on default #address-cells value for %s",
 		     node->fullpath);
 
 	if (node->parent->size_cells == -1)
-		FAIL(c, "Relying on default #size-cells value for %s",
+		FAIL(c, dti, "Relying on default #size-cells value for %s",
 		     node->fullpath);
 }
 WARNING(avoid_default_addr_size, check_avoid_default_addr_size, NULL,
@@ -684,7 +950,7 @@ static void check_obsolete_chosen_interrupt_controller(struct check *c,
 
 	prop = get_property(chosen, "interrupt-controller");
 	if (prop)
-		FAIL(c, "/chosen has obsolete \"interrupt-controller\" "
+		FAIL(c, dti, "/chosen has obsolete \"interrupt-controller\" "
 		     "property");
 }
 WARNING(obsolete_chosen_interrupt_controller,
@@ -703,9 +969,20 @@ static struct check *check_table[] = {
 	&address_cells_is_cell, &size_cells_is_cell, &interrupt_cells_is_cell,
 	&device_type_is_string, &model_is_string, &status_is_string,
 
+	&property_name_chars_strict,
+	&node_name_chars_strict,
+
 	&addr_size_cells, &reg_format, &ranges_format,
 
 	&unit_address_vs_reg,
+	&unit_address_format,
+
+	&pci_bridge,
+	&pci_device_reg,
+	&pci_device_bus_num,
+
+	&simple_bus_bridge,
+	&simple_bus_reg,
 
 	&avoid_default_addr_size,
 	&obsolete_chosen_interrupt_controller,
diff --git a/scripts/dtc/data.c b/scripts/dtc/data.c
index 8cae23746882..aa37a16c8891 100644
--- a/scripts/dtc/data.c
+++ b/scripts/dtc/data.c
@@ -171,9 +171,9 @@ struct data data_merge(struct data d1, struct data d2)
 struct data data_append_integer(struct data d, uint64_t value, int bits)
 {
 	uint8_t value_8;
-	uint16_t value_16;
-	uint32_t value_32;
-	uint64_t value_64;
+	fdt16_t value_16;
+	fdt32_t value_32;
+	fdt64_t value_64;
 
 	switch (bits) {
 	case 8:
@@ -197,14 +197,14 @@ struct data data_append_integer(struct data d, uint64_t value, int bits)
 	}
 }
 
-struct data data_append_re(struct data d, const struct fdt_reserve_entry *re)
+struct data data_append_re(struct data d, uint64_t address, uint64_t size)
 {
-	struct fdt_reserve_entry bere;
+	struct fdt_reserve_entry re;
 
-	bere.address = cpu_to_fdt64(re->address);
-	bere.size = cpu_to_fdt64(re->size);
+	re.address = cpu_to_fdt64(address);
+	re.size = cpu_to_fdt64(size);
 
-	return data_append_data(d, &bere, sizeof(bere));
+	return data_append_data(d, &re, sizeof(re));
 }
 
 struct data data_append_cell(struct data d, cell_t word)
diff --git a/scripts/dtc/dtc-lexer.l b/scripts/dtc/dtc-lexer.l
index c600603044f3..fd825ebba69c 100644
--- a/scripts/dtc/dtc-lexer.l
+++ b/scripts/dtc/dtc-lexer.l
@@ -62,7 +62,8 @@ static int dts_version = 1;
 
 static void push_input_file(const char *filename);
 static bool pop_input_file(void);
-static void lexical_error(const char *fmt, ...);
+static void PRINTF(1, 2) lexical_error(const char *fmt, ...);
+
 %}
 
 %%
diff --git a/scripts/dtc/dtc-lexer.lex.c_shipped b/scripts/dtc/dtc-lexer.lex.c_shipped
index 2c862bc86ad0..64c243772398 100644
--- a/scripts/dtc/dtc-lexer.lex.c_shipped
+++ b/scripts/dtc/dtc-lexer.lex.c_shipped
@@ -655,8 +655,9 @@ static int dts_version = 1;
 
 static void push_input_file(const char *filename);
 static bool pop_input_file(void);
-static void lexical_error(const char *fmt, ...);
-#line 660 "dtc-lexer.lex.c"
+static void PRINTF(1, 2) lexical_error(const char *fmt, ...);
+
+#line 661 "dtc-lexer.lex.c"
 
 #define INITIAL 0
 #define BYTESTRING 1
@@ -878,9 +879,9 @@ YY_DECL
 		}
 
 	{
-#line 68 "dtc-lexer.l"
+#line 69 "dtc-lexer.l"
 
-#line 884 "dtc-lexer.lex.c"
+#line 885 "dtc-lexer.lex.c"
 
 	while ( /*CONSTCOND*/1 )		/* loops until end-of-file is reached */
 		{
@@ -937,7 +938,7 @@ do_action:	/* This label is used only to access EOF actions. */
 case 1:
 /* rule 1 can match eol */
 YY_RULE_SETUP
-#line 69 "dtc-lexer.l"
+#line 70 "dtc-lexer.l"
 {
 			char *name = strchr(yytext, '\"') + 1;
 			yytext[yyleng-1] = '\0';
@@ -947,7 +948,7 @@ YY_RULE_SETUP
 case 2:
 /* rule 2 can match eol */
 YY_RULE_SETUP
-#line 75 "dtc-lexer.l"
+#line 76 "dtc-lexer.l"
 {
 			char *line, *fnstart, *fnend;
 			struct data fn;
@@ -981,7 +982,7 @@ case YY_STATE_EOF(INITIAL):
 case YY_STATE_EOF(BYTESTRING):
 case YY_STATE_EOF(PROPNODENAME):
 case YY_STATE_EOF(V1):
-#line 104 "dtc-lexer.l"
+#line 105 "dtc-lexer.l"
 {
 			if (!pop_input_file()) {
 				yyterminate();
@@ -991,7 +992,7 @@ case YY_STATE_EOF(V1):
 case 3:
 /* rule 3 can match eol */
 YY_RULE_SETUP
-#line 110 "dtc-lexer.l"
+#line 111 "dtc-lexer.l"
 {
 			DPRINT("String: %s\n", yytext);
 			yylval.data = data_copy_escape_string(yytext+1,
@@ -1001,7 +1002,7 @@ YY_RULE_SETUP
 	YY_BREAK
 case 4:
 YY_RULE_SETUP
-#line 117 "dtc-lexer.l"
+#line 118 "dtc-lexer.l"
 {
 			DPRINT("Keyword: /dts-v1/\n");
 			dts_version = 1;
@@ -1011,7 +1012,7 @@ YY_RULE_SETUP
 	YY_BREAK
 case 5:
 YY_RULE_SETUP
-#line 124 "dtc-lexer.l"
+#line 125 "dtc-lexer.l"
 {
 			DPRINT("Keyword: /plugin/\n");
 			return DT_PLUGIN;
@@ -1019,7 +1020,7 @@ YY_RULE_SETUP
 	YY_BREAK
 case 6:
 YY_RULE_SETUP
-#line 129 "dtc-lexer.l"
+#line 130 "dtc-lexer.l"
 {
 			DPRINT("Keyword: /memreserve/\n");
 			BEGIN_DEFAULT();
@@ -1028,7 +1029,7 @@ YY_RULE_SETUP
 	YY_BREAK
 case 7:
 YY_RULE_SETUP
-#line 135 "dtc-lexer.l"
+#line 136 "dtc-lexer.l"
 {
 			DPRINT("Keyword: /bits/\n");
 			BEGIN_DEFAULT();
@@ -1037,7 +1038,7 @@ YY_RULE_SETUP
 	YY_BREAK
 case 8:
 YY_RULE_SETUP
-#line 141 "dtc-lexer.l"
+#line 142 "dtc-lexer.l"
 {
 			DPRINT("Keyword: /delete-property/\n");
 			DPRINT("<PROPNODENAME>\n");
@@ -1047,7 +1048,7 @@ YY_RULE_SETUP
 	YY_BREAK
 case 9:
 YY_RULE_SETUP
-#line 148 "dtc-lexer.l"
+#line 149 "dtc-lexer.l"
 {
 			DPRINT("Keyword: /delete-node/\n");
 			DPRINT("<PROPNODENAME>\n");
@@ -1057,7 +1058,7 @@ YY_RULE_SETUP
 	YY_BREAK
 case 10:
 YY_RULE_SETUP
-#line 155 "dtc-lexer.l"
+#line 156 "dtc-lexer.l"
 {
 			DPRINT("Label: %s\n", yytext);
 			yylval.labelref = xstrdup(yytext);
@@ -1067,7 +1068,7 @@ YY_RULE_SETUP
 	YY_BREAK
 case 11:
 YY_RULE_SETUP
-#line 162 "dtc-lexer.l"
+#line 163 "dtc-lexer.l"
 {
 			char *e;
 			DPRINT("Integer Literal: '%s'\n", yytext);
@@ -1093,7 +1094,7 @@ YY_RULE_SETUP
 case 12:
 /* rule 12 can match eol */
 YY_RULE_SETUP
-#line 184 "dtc-lexer.l"
+#line 185 "dtc-lexer.l"
 {
 			struct data d;
 			DPRINT("Character literal: %s\n", yytext);
@@ -1117,7 +1118,7 @@ YY_RULE_SETUP
 	YY_BREAK
 case 13:
 YY_RULE_SETUP
-#line 205 "dtc-lexer.l"
+#line 206 "dtc-lexer.l"
 {	/* label reference */
 			DPRINT("Ref: %s\n", yytext+1);
 			yylval.labelref = xstrdup(yytext+1);
@@ -1126,7 +1127,7 @@ YY_RULE_SETUP
 	YY_BREAK
 case 14:
 YY_RULE_SETUP
-#line 211 "dtc-lexer.l"
+#line 212 "dtc-lexer.l"
 {	/* new-style path reference */
 			yytext[yyleng-1] = '\0';
 			DPRINT("Ref: %s\n", yytext+2);
@@ -1136,7 +1137,7 @@ YY_RULE_SETUP
 	YY_BREAK
 case 15:
 YY_RULE_SETUP
-#line 218 "dtc-lexer.l"
+#line 219 "dtc-lexer.l"
 {
 			yylval.byte = strtol(yytext, NULL, 16);
 			DPRINT("Byte: %02x\n", (int)yylval.byte);
@@ -1145,7 +1146,7 @@ YY_RULE_SETUP
 	YY_BREAK
 case 16:
 YY_RULE_SETUP
-#line 224 "dtc-lexer.l"
+#line 225 "dtc-lexer.l"
 {
 			DPRINT("/BYTESTRING\n");
 			BEGIN_DEFAULT();
@@ -1154,7 +1155,7 @@ YY_RULE_SETUP
 	YY_BREAK
 case 17:
 YY_RULE_SETUP
-#line 230 "dtc-lexer.l"
+#line 231 "dtc-lexer.l"
 {
 			DPRINT("PropNodeName: %s\n", yytext);
 			yylval.propnodename = xstrdup((yytext[0] == '\\') ?
@@ -1165,7 +1166,7 @@ YY_RULE_SETUP
 	YY_BREAK
 case 18:
 YY_RULE_SETUP
-#line 238 "dtc-lexer.l"
+#line 239 "dtc-lexer.l"
 {
 			DPRINT("Binary Include\n");
 			return DT_INCBIN;
@@ -1174,64 +1175,64 @@ YY_RULE_SETUP
 case 19:
 /* rule 19 can match eol */
 YY_RULE_SETUP
-#line 243 "dtc-lexer.l"
+#line 244 "dtc-lexer.l"
 /* eat whitespace */
 	YY_BREAK
 case 20:
 /* rule 20 can match eol */
 YY_RULE_SETUP
-#line 244 "dtc-lexer.l"
+#line 245 "dtc-lexer.l"
 /* eat C-style comments */
 	YY_BREAK
 case 21:
 /* rule 21 can match eol */
 YY_RULE_SETUP
-#line 245 "dtc-lexer.l"
+#line 246 "dtc-lexer.l"
 /* eat C++-style comments */
 	YY_BREAK
 case 22:
 YY_RULE_SETUP
-#line 247 "dtc-lexer.l"
+#line 248 "dtc-lexer.l"
 { return DT_LSHIFT; };
 	YY_BREAK
 case 23:
 YY_RULE_SETUP
-#line 248 "dtc-lexer.l"
+#line 249 "dtc-lexer.l"
 { return DT_RSHIFT; };
 	YY_BREAK
 case 24:
 YY_RULE_SETUP
-#line 249 "dtc-lexer.l"
+#line 250 "dtc-lexer.l"
 { return DT_LE; };
 	YY_BREAK
 case 25:
 YY_RULE_SETUP
-#line 250 "dtc-lexer.l"
+#line 251 "dtc-lexer.l"
 { return DT_GE; };
 	YY_BREAK
 case 26:
 YY_RULE_SETUP
-#line 251 "dtc-lexer.l"
+#line 252 "dtc-lexer.l"
 { return DT_EQ; };
 	YY_BREAK
 case 27:
 YY_RULE_SETUP
-#line 252 "dtc-lexer.l"
+#line 253 "dtc-lexer.l"
 { return DT_NE; };
 	YY_BREAK
 case 28:
 YY_RULE_SETUP
-#line 253 "dtc-lexer.l"
+#line 254 "dtc-lexer.l"
 { return DT_AND; };
 	YY_BREAK
 case 29:
 YY_RULE_SETUP
-#line 254 "dtc-lexer.l"
+#line 255 "dtc-lexer.l"
 { return DT_OR; };
 	YY_BREAK
 case 30:
 YY_RULE_SETUP
-#line 256 "dtc-lexer.l"
+#line 257 "dtc-lexer.l"
 {
 			DPRINT("Char: %c (\\x%02x)\n", yytext[0],
 				(unsigned)yytext[0]);
@@ -1249,10 +1250,10 @@ YY_RULE_SETUP
 	YY_BREAK
 case 31:
 YY_RULE_SETUP
-#line 271 "dtc-lexer.l"
+#line 272 "dtc-lexer.l"
 ECHO;
 	YY_BREAK
-#line 1256 "dtc-lexer.lex.c"
+#line 1257 "dtc-lexer.lex.c"
 
 	case YY_END_OF_BUFFER:
 		{
@@ -2218,7 +2219,7 @@ void yyfree (void * ptr )
 
 #define YYTABLES_NAME "yytables"
 
-#line 271 "dtc-lexer.l"
+#line 272 "dtc-lexer.l"
 
 
 
diff --git a/scripts/dtc/dtc-parser.tab.c_shipped b/scripts/dtc/dtc-parser.tab.c_shipped
index 2965227a1b4a..0a7a5ed86f04 100644
--- a/scripts/dtc/dtc-parser.tab.c_shipped
+++ b/scripts/dtc/dtc-parser.tab.c_shipped
@@ -1557,10 +1557,10 @@ yyreduce:
     {
 			struct node *target = get_node_by_ref((yyvsp[-3].node), (yyvsp[-1].labelref));
 
-			add_label(&target->labels, (yyvsp[-2].labelref));
-			if (target)
+			if (target) {
+				add_label(&target->labels, (yyvsp[-2].labelref));
 				merge_nodes(target, (yyvsp[0].node));
-			else
+			} else
 				ERROR(&(yylsp[-1]), "Label or path %s not found", (yyvsp[-1].labelref));
 			(yyval.node) = (yyvsp[-3].node);
 		}
diff --git a/scripts/dtc/dtc-parser.y b/scripts/dtc/dtc-parser.y
index b2fd4d155839..ca3f5003427c 100644
--- a/scripts/dtc/dtc-parser.y
+++ b/scripts/dtc/dtc-parser.y
@@ -171,10 +171,10 @@ devicetree:
 		{
 			struct node *target = get_node_by_ref($1, $3);
 
-			add_label(&target->labels, $2);
-			if (target)
+			if (target) {
+				add_label(&target->labels, $2);
 				merge_nodes(target, $4);
-			else
+			} else
 				ERROR(&@3, "Label or path %s not found", $3);
 			$$ = $1;
 		}
diff --git a/scripts/dtc/dtc.c b/scripts/dtc/dtc.c
index a4edf4c7aebf..f5eed9d72c02 100644
--- a/scripts/dtc/dtc.c
+++ b/scripts/dtc/dtc.c
@@ -138,7 +138,7 @@ static const char *guess_type_by_name(const char *fname, const char *fallback)
 static const char *guess_input_format(const char *fname, const char *fallback)
 {
 	struct stat statbuf;
-	uint32_t magic;
+	fdt32_t magic;
 	FILE *f;
 
 	if (stat(fname, &statbuf) != 0)
@@ -159,8 +159,7 @@ static const char *guess_input_format(const char *fname, const char *fallback)
 	}
 	fclose(f);
 
-	magic = fdt32_to_cpu(magic);
-	if (magic == FDT_MAGIC)
+	if (fdt32_to_cpu(magic) == FDT_MAGIC)
 		return "dtb";
 
 	return guess_type_by_name(fname, fallback);
@@ -216,7 +215,7 @@ int main(int argc, char *argv[])
 			alignsize = strtol(optarg, NULL, 0);
 			if (!is_power_of_2(alignsize))
 				die("Invalid argument \"%d\" to -a option\n",
-				    optarg);
+				    alignsize);
 			break;
 		case 'f':
 			force = true;
@@ -309,6 +308,8 @@ int main(int argc, char *argv[])
 	else
 		die("Unknown input format \"%s\"\n", inform);
 
+	dti->outname = outname;
+
 	if (depfile) {
 		fputc('\n', depfile);
 		fclose(depfile);
diff --git a/scripts/dtc/dtc.h b/scripts/dtc/dtc.h
index c6f125c68ba8..fc24e17510fd 100644
--- a/scripts/dtc/dtc.h
+++ b/scripts/dtc/dtc.h
@@ -43,7 +43,6 @@
 #define debug(...)
 #endif
 
-
 #define DEFAULT_FDT_VERSION	17
 
 /*
@@ -114,7 +113,7 @@ struct data data_insert_at_marker(struct data d, struct marker *m,
 struct data data_merge(struct data d1, struct data d2);
 struct data data_append_cell(struct data d, cell_t word);
 struct data data_append_integer(struct data d, uint64_t word, int bits);
-struct data data_append_re(struct data d, const struct fdt_reserve_entry *re);
+struct data data_append_re(struct data d, uint64_t address, uint64_t size);
 struct data data_append_addr(struct data d, uint64_t addr);
 struct data data_append_byte(struct data d, uint8_t byte);
 struct data data_append_zeroes(struct data d, int len);
@@ -136,6 +135,10 @@ struct label {
 	struct label *next;
 };
 
+struct bus_type {
+	const char *name;
+};
+
 struct property {
 	bool deleted;
 	char *name;
@@ -162,6 +165,7 @@ struct node {
 	int addr_cells, size_cells;
 
 	struct label *labels;
+	const struct bus_type *bus;
 };
 
 #define for_each_label_withdel(l0, l) \
@@ -227,7 +231,7 @@ uint32_t guess_boot_cpuid(struct node *tree);
 /* Boot info (tree plus memreserve information */
 
 struct reserve_info {
-	struct fdt_reserve_entry re;
+	uint64_t address, size;
 
 	struct reserve_info *next;
 
@@ -246,6 +250,7 @@ struct dt_info {
 	struct reserve_info *reservelist;
 	uint32_t boot_cpuid_phys;
 	struct node *dt;		/* the device tree */
+	const char *outname;		/* filename being written to, "-" for stdout */
 };
 
 /* DTS version flags definitions */
diff --git a/scripts/dtc/flattree.c b/scripts/dtc/flattree.c
index ebac548b3fa8..fcf71541d8a7 100644
--- a/scripts/dtc/flattree.c
+++ b/scripts/dtc/flattree.c
@@ -49,7 +49,7 @@ static struct version_info {
 
 struct emitter {
 	void (*cell)(void *, cell_t);
-	void (*string)(void *, char *, int);
+	void (*string)(void *, const char *, int);
 	void (*align)(void *, int);
 	void (*data)(void *, struct data);
 	void (*beginnode)(void *, struct label *labels);
@@ -64,7 +64,7 @@ static void bin_emit_cell(void *e, cell_t val)
 	*dtbuf = data_append_cell(*dtbuf, val);
 }
 
-static void bin_emit_string(void *e, char *str, int len)
+static void bin_emit_string(void *e, const char *str, int len)
 {
 	struct data *dtbuf = e;
 
@@ -144,22 +144,14 @@ static void asm_emit_cell(void *e, cell_t val)
 		(val >> 8) & 0xff, val & 0xff);
 }
 
-static void asm_emit_string(void *e, char *str, int len)
+static void asm_emit_string(void *e, const char *str, int len)
 {
 	FILE *f = e;
-	char c = 0;
 
-	if (len != 0) {
-		/* XXX: ewww */
-		c = str[len];
-		str[len] = '\0';
-	}
-
-	fprintf(f, "\t.string\t\"%s\"\n", str);
-
-	if (len != 0) {
-		str[len] = c;
-	}
+	if (len != 0)
+		fprintf(f, "\t.string\t\"%.*s\"\n", len, str);
+	else
+		fprintf(f, "\t.string\t\"%s\"\n", str);
 }
 
 static void asm_emit_align(void *e, int a)
@@ -179,7 +171,7 @@ static void asm_emit_data(void *e, struct data d)
 		emit_offset_label(f, m->ref, m->offset);
 
 	while ((d.len - off) >= sizeof(uint32_t)) {
-		asm_emit_cell(e, fdt32_to_cpu(*((uint32_t *)(d.val+off))));
+		asm_emit_cell(e, fdt32_to_cpu(*((fdt32_t *)(d.val+off))));
 		off += sizeof(uint32_t);
 	}
 
@@ -318,17 +310,16 @@ static struct data flatten_reserve_list(struct reserve_info *reservelist,
 {
 	struct reserve_info *re;
 	struct data d = empty_data;
-	static struct fdt_reserve_entry null_re = {0,0};
 	int    j;
 
 	for (re = reservelist; re; re = re->next) {
-		d = data_append_re(d, &re->re);
+		d = data_append_re(d, re->address, re->size);
 	}
 	/*
 	 * Add additional reserved slots if the user asked for them.
 	 */
 	for (j = 0; j < reservenum; j++) {
-		d = data_append_re(d, &null_re);
+		d = data_append_re(d, 0, 0);
 	}
 
 	return d;
@@ -544,11 +535,11 @@ void dt_to_asm(FILE *f, struct dt_info *dti, int version)
 			fprintf(f, "\t.globl\t%s\n", l->label);
 			fprintf(f, "%s:\n", l->label);
 		}
-		ASM_EMIT_BELONG(f, "0x%08x", (unsigned int)(re->re.address >> 32));
+		ASM_EMIT_BELONG(f, "0x%08x", (unsigned int)(re->address >> 32));
 		ASM_EMIT_BELONG(f, "0x%08x",
-				(unsigned int)(re->re.address & 0xffffffff));
-		ASM_EMIT_BELONG(f, "0x%08x", (unsigned int)(re->re.size >> 32));
-		ASM_EMIT_BELONG(f, "0x%08x", (unsigned int)(re->re.size & 0xffffffff));
+				(unsigned int)(re->address & 0xffffffff));
+		ASM_EMIT_BELONG(f, "0x%08x", (unsigned int)(re->size >> 32));
+		ASM_EMIT_BELONG(f, "0x%08x", (unsigned int)(re->size & 0xffffffff));
 	}
 	for (i = 0; i < reservenum; i++) {
 		fprintf(f, "\t.long\t0, 0\n\t.long\t0, 0\n");
@@ -609,7 +600,7 @@ static void flat_read_chunk(struct inbuf *inb, void *p, int len)
 
 static uint32_t flat_read_word(struct inbuf *inb)
 {
-	uint32_t val;
+	fdt32_t val;
 
 	assert(((inb->ptr - inb->base) % sizeof(val)) == 0);
 
@@ -718,13 +709,15 @@ static struct reserve_info *flat_read_mem_reserve(struct inbuf *inb)
 	 * First pass, count entries.
 	 */
 	while (1) {
+		uint64_t address, size;
+
 		flat_read_chunk(inb, &re, sizeof(re));
-		re.address  = fdt64_to_cpu(re.address);
-		re.size = fdt64_to_cpu(re.size);
-		if (re.size == 0)
+		address  = fdt64_to_cpu(re.address);
+		size = fdt64_to_cpu(re.size);
+		if (size == 0)
 			break;
 
-		new = build_reserve_entry(re.address, re.size);
+		new = build_reserve_entry(address, size);
 		reservelist = add_reserve_entry(reservelist, new);
 	}
 
@@ -817,6 +810,7 @@ static struct node *unflatten_tree(struct inbuf *dtbuf,
 struct dt_info *dt_from_blob(const char *fname)
 {
 	FILE *f;
+	fdt32_t magic_buf, totalsize_buf;
 	uint32_t magic, totalsize, version, size_dt, boot_cpuid_phys;
 	uint32_t off_dt, off_str, off_mem_rsvmap;
 	int rc;
@@ -833,7 +827,7 @@ struct dt_info *dt_from_blob(const char *fname)
 
 	f = srcfile_relative_open(fname, NULL);
 
-	rc = fread(&magic, sizeof(magic), 1, f);
+	rc = fread(&magic_buf, sizeof(magic_buf), 1, f);
 	if (ferror(f))
 		die("Error reading DT blob magic number: %s\n",
 		    strerror(errno));
@@ -844,11 +838,11 @@ struct dt_info *dt_from_blob(const char *fname)
 			die("Mysterious short read reading magic number\n");
 	}
 
-	magic = fdt32_to_cpu(magic);
+	magic = fdt32_to_cpu(magic_buf);
 	if (magic != FDT_MAGIC)
 		die("Blob has incorrect magic number\n");
 
-	rc = fread(&totalsize, sizeof(totalsize), 1, f);
+	rc = fread(&totalsize_buf, sizeof(totalsize_buf), 1, f);
 	if (ferror(f))
 		die("Error reading DT blob size: %s\n", strerror(errno));
 	if (rc < 1) {
@@ -858,7 +852,7 @@ struct dt_info *dt_from_blob(const char *fname)
 			die("Mysterious short read reading blob size\n");
 	}
 
-	totalsize = fdt32_to_cpu(totalsize);
+	totalsize = fdt32_to_cpu(totalsize_buf);
 	if (totalsize < FDT_V1_SIZE)
 		die("DT blob size (%d) is too small\n", totalsize);
 
diff --git a/scripts/dtc/libfdt/fdt_rw.c b/scripts/dtc/libfdt/fdt_rw.c
index 2eed4f58387c..3fd5847377c9 100644
--- a/scripts/dtc/libfdt/fdt_rw.c
+++ b/scripts/dtc/libfdt/fdt_rw.c
@@ -283,7 +283,8 @@ int fdt_setprop(void *fdt, int nodeoffset, const char *name,
 	if (err)
 		return err;
 
-	memcpy(prop->data, val, len);
+	if (len)
+		memcpy(prop->data, val, len);
 	return 0;
 }
 
diff --git a/scripts/dtc/libfdt/libfdt.h b/scripts/dtc/libfdt/libfdt.h
index b842b156fa17..ba86caa73d01 100644
--- a/scripts/dtc/libfdt/libfdt.h
+++ b/scripts/dtc/libfdt/libfdt.h
@@ -143,7 +143,9 @@
 /* Low-level functions (you probably don't need these)                */
 /**********************************************************************/
 
+#ifndef SWIG /* This function is not useful in Python */
 const void *fdt_offset_ptr(const void *fdt, int offset, unsigned int checklen);
+#endif
 static inline void *fdt_offset_ptr_w(void *fdt, int offset, int checklen)
 {
 	return (void *)(uintptr_t)fdt_offset_ptr(fdt, offset, checklen);
@@ -210,7 +212,6 @@ int fdt_next_subnode(const void *fdt, int offset);
 /**********************************************************************/
 /* General functions                                                  */
 /**********************************************************************/
-
 #define fdt_get_header(fdt, field) \
 	(fdt32_to_cpu(((const struct fdt_header *)(fdt))->field))
 #define fdt_magic(fdt)			(fdt_get_header(fdt, magic))
@@ -354,8 +355,10 @@ int fdt_get_mem_rsv(const void *fdt, int n, uint64_t *address, uint64_t *size);
  * useful for finding subnodes based on a portion of a larger string,
  * such as a full path.
  */
+#ifndef SWIG /* Not available in Python */
 int fdt_subnode_offset_namelen(const void *fdt, int parentoffset,
 			       const char *name, int namelen);
+#endif
 /**
  * fdt_subnode_offset - find a subnode of a given node
  * @fdt: pointer to the device tree blob
@@ -391,7 +394,9 @@ int fdt_subnode_offset(const void *fdt, int parentoffset, const char *name);
  * Identical to fdt_path_offset(), but only consider the first namelen
  * characters of path as the path name.
  */
+#ifndef SWIG /* Not available in Python */
 int fdt_path_offset_namelen(const void *fdt, const char *path, int namelen);
+#endif
 
 /**
  * fdt_path_offset - find a tree node by its full path
@@ -550,10 +555,12 @@ const struct fdt_property *fdt_get_property_by_offset(const void *fdt,
  * Identical to fdt_get_property(), but only examine the first namelen
  * characters of name for matching the property name.
  */
+#ifndef SWIG /* Not available in Python */
 const struct fdt_property *fdt_get_property_namelen(const void *fdt,
 						    int nodeoffset,
 						    const char *name,
 						    int namelen, int *lenp);
+#endif
 
 /**
  * fdt_get_property - find a given property in a given node
@@ -624,8 +631,10 @@ static inline struct fdt_property *fdt_get_property_w(void *fdt, int nodeoffset,
  *		-FDT_ERR_BADSTRUCTURE,
  *		-FDT_ERR_TRUNCATED, standard meanings
  */
+#ifndef SWIG /* This function is not useful in Python */
 const void *fdt_getprop_by_offset(const void *fdt, int offset,
 				  const char **namep, int *lenp);
+#endif
 
 /**
  * fdt_getprop_namelen - get property value based on substring
@@ -638,6 +647,7 @@ const void *fdt_getprop_by_offset(const void *fdt, int offset,
  * Identical to fdt_getprop(), but only examine the first namelen
  * characters of name for matching the property name.
  */
+#ifndef SWIG /* Not available in Python */
 const void *fdt_getprop_namelen(const void *fdt, int nodeoffset,
 				const char *name, int namelen, int *lenp);
 static inline void *fdt_getprop_namelen_w(void *fdt, int nodeoffset,
@@ -647,6 +657,7 @@ static inline void *fdt_getprop_namelen_w(void *fdt, int nodeoffset,
 	return (void *)(uintptr_t)fdt_getprop_namelen(fdt, nodeoffset, name,
 						      namelen, lenp);
 }
+#endif
 
 /**
  * fdt_getprop - retrieve the value of a given property
@@ -707,8 +718,10 @@ uint32_t fdt_get_phandle(const void *fdt, int nodeoffset);
  * Identical to fdt_get_alias(), but only examine the first namelen
  * characters of name for matching the alias name.
  */
+#ifndef SWIG /* Not available in Python */
 const char *fdt_get_alias_namelen(const void *fdt,
 				  const char *name, int namelen);
+#endif
 
 /**
  * fdt_get_alias - retrieve the path referenced by a given alias
@@ -1106,10 +1119,12 @@ int fdt_size_cells(const void *fdt, int nodeoffset);
  * of the name. It is useful when you want to manipulate only one value of
  * an array and you have a string that doesn't end with \0.
  */
+#ifndef SWIG /* Not available in Python */
 int fdt_setprop_inplace_namelen_partial(void *fdt, int nodeoffset,
 					const char *name, int namelen,
 					uint32_t idx, const void *val,
 					int len);
+#endif
 
 /**
  * fdt_setprop_inplace - change a property's value, but not its size
@@ -1139,8 +1154,10 @@ int fdt_setprop_inplace_namelen_partial(void *fdt, int nodeoffset,
  *	-FDT_ERR_BADSTRUCTURE,
  *	-FDT_ERR_TRUNCATED, standard meanings
  */
+#ifndef SWIG /* Not available in Python */
 int fdt_setprop_inplace(void *fdt, int nodeoffset, const char *name,
 			const void *val, int len);
+#endif
 
 /**
  * fdt_setprop_inplace_u32 - change the value of a 32-bit integer property
@@ -1527,6 +1544,36 @@ static inline int fdt_setprop_cell(void *fdt, int nodeoffset, const char *name,
 #define fdt_setprop_string(fdt, nodeoffset, name, str) \
 	fdt_setprop((fdt), (nodeoffset), (name), (str), strlen(str)+1)
 
+
+/**
+ * fdt_setprop_empty - set a property to an empty value
+ * @fdt: pointer to the device tree blob
+ * @nodeoffset: offset of the node whose property to change
+ * @name: name of the property to change
+ *
+ * fdt_setprop_empty() sets the value of the named property in the
+ * given node to an empty (zero length) value, or creates a new empty
+ * property if it does not already exist.
+ *
+ * This function may insert or delete data from the blob, and will
+ * therefore change the offsets of some existing nodes.
+ *
+ * returns:
+ *	0, on success
+ *	-FDT_ERR_NOSPACE, there is insufficient free space in the blob to
+ *		contain the new property value
+ *	-FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
+ *	-FDT_ERR_BADLAYOUT,
+ *	-FDT_ERR_BADMAGIC,
+ *	-FDT_ERR_BADVERSION,
+ *	-FDT_ERR_BADSTATE,
+ *	-FDT_ERR_BADSTRUCTURE,
+ *	-FDT_ERR_BADLAYOUT,
+ *	-FDT_ERR_TRUNCATED, standard meanings
+ */
+#define fdt_setprop_empty(fdt, nodeoffset, name) \
+	fdt_setprop((fdt), (nodeoffset), (name), NULL, 0)
+
 /**
  * fdt_appendprop - append to or create a property
  * @fdt: pointer to the device tree blob
@@ -1704,8 +1751,10 @@ int fdt_delprop(void *fdt, int nodeoffset, const char *name);
  * creating subnodes based on a portion of a larger string, such as a
  * full path.
  */
+#ifndef SWIG /* Not available in Python */
 int fdt_add_subnode_namelen(void *fdt, int parentoffset,
 			    const char *name, int namelen);
+#endif
 
 /**
  * fdt_add_subnode - creates a new node
diff --git a/scripts/dtc/libfdt/libfdt_env.h b/scripts/dtc/libfdt/libfdt_env.h
index 99f936dacc60..952056cddf09 100644
--- a/scripts/dtc/libfdt/libfdt_env.h
+++ b/scripts/dtc/libfdt/libfdt_env.h
@@ -58,16 +58,16 @@
 #include <string.h>
 
 #ifdef __CHECKER__
-#define __force __attribute__((force))
-#define __bitwise __attribute__((bitwise))
+#define FDT_FORCE __attribute__((force))
+#define FDT_BITWISE __attribute__((bitwise))
 #else
-#define __force
-#define __bitwise
+#define FDT_FORCE
+#define FDT_BITWISE
 #endif
 
-typedef uint16_t __bitwise fdt16_t;
-typedef uint32_t __bitwise fdt32_t;
-typedef uint64_t __bitwise fdt64_t;
+typedef uint16_t FDT_BITWISE fdt16_t;
+typedef uint32_t FDT_BITWISE fdt32_t;
+typedef uint64_t FDT_BITWISE fdt64_t;
 
 #define EXTRACT_BYTE(x, n)	((unsigned long long)((uint8_t *)&x)[n])
 #define CPU_TO_FDT16(x) ((EXTRACT_BYTE(x, 0) << 8) | EXTRACT_BYTE(x, 1))
@@ -80,29 +80,29 @@ typedef uint64_t __bitwise fdt64_t;
 
 static inline uint16_t fdt16_to_cpu(fdt16_t x)
 {
-	return (__force uint16_t)CPU_TO_FDT16(x);
+	return (FDT_FORCE uint16_t)CPU_TO_FDT16(x);
 }
 static inline fdt16_t cpu_to_fdt16(uint16_t x)
 {
-	return (__force fdt16_t)CPU_TO_FDT16(x);
+	return (FDT_FORCE fdt16_t)CPU_TO_FDT16(x);
 }
 
 static inline uint32_t fdt32_to_cpu(fdt32_t x)
 {
-	return (__force uint32_t)CPU_TO_FDT32(x);
+	return (FDT_FORCE uint32_t)CPU_TO_FDT32(x);
 }
 static inline fdt32_t cpu_to_fdt32(uint32_t x)
 {
-	return (__force fdt32_t)CPU_TO_FDT32(x);
+	return (FDT_FORCE fdt32_t)CPU_TO_FDT32(x);
 }
 
 static inline uint64_t fdt64_to_cpu(fdt64_t x)
 {
-	return (__force uint64_t)CPU_TO_FDT64(x);
+	return (FDT_FORCE uint64_t)CPU_TO_FDT64(x);
 }
 static inline fdt64_t cpu_to_fdt64(uint64_t x)
 {
-	return (__force fdt64_t)CPU_TO_FDT64(x);
+	return (FDT_FORCE fdt64_t)CPU_TO_FDT64(x);
 }
 #undef CPU_TO_FDT64
 #undef CPU_TO_FDT32
diff --git a/scripts/dtc/livetree.c b/scripts/dtc/livetree.c
index afa2f67b142a..3673de07e4e5 100644
--- a/scripts/dtc/livetree.c
+++ b/scripts/dtc/livetree.c
@@ -242,7 +242,7 @@ void delete_property_by_name(struct node *node, char *name)
 	struct property *prop = node->proplist;
 
 	while (prop) {
-		if (!strcmp(prop->name, name)) {
+		if (streq(prop->name, name)) {
 			delete_property(prop);
 			return;
 		}
@@ -275,7 +275,7 @@ void delete_node_by_name(struct node *parent, char *name)
 	struct node *node = parent->children;
 
 	while (node) {
-		if (!strcmp(node->name, name)) {
+		if (streq(node->name, name)) {
 			delete_node(node);
 			return;
 		}
@@ -319,8 +319,8 @@ struct reserve_info *build_reserve_entry(uint64_t address, uint64_t size)
 
 	memset(new, 0, sizeof(*new));
 
-	new->re.address = address;
-	new->re.size = size;
+	new->address = address;
+	new->size = size;
 
 	return new;
 }
@@ -393,7 +393,7 @@ struct property *get_property(struct node *node, const char *propname)
 cell_t propval_cell(struct property *prop)
 {
 	assert(prop->val.len == sizeof(cell_t));
-	return fdt32_to_cpu(*((cell_t *)prop->val.val));
+	return fdt32_to_cpu(*((fdt32_t *)prop->val.val));
 }
 
 struct property *get_property_by_label(struct node *tree, const char *label,
@@ -599,13 +599,13 @@ static int cmp_reserve_info(const void *ax, const void *bx)
 	a = *((const struct reserve_info * const *)ax);
 	b = *((const struct reserve_info * const *)bx);
 
-	if (a->re.address < b->re.address)
+	if (a->address < b->address)
 		return -1;
-	else if (a->re.address > b->re.address)
+	else if (a->address > b->address)
 		return 1;
-	else if (a->re.size < b->re.size)
+	else if (a->size < b->size)
 		return -1;
-	else if (a->re.size > b->re.size)
+	else if (a->size > b->size)
 		return 1;
 	else
 		return 0;
@@ -847,6 +847,8 @@ static void add_fixup_entry(struct dt_info *dti, struct node *fn,
 	xasprintf(&entry, "%s:%s:%u",
 			node->fullpath, prop->name, m->offset);
 	append_to_property(fn, m->ref, entry, strlen(entry) + 1);
+
+	free(entry);
 }
 
 static void generate_fixups_tree_internal(struct dt_info *dti,
@@ -900,7 +902,7 @@ static void add_local_fixup_entry(struct dt_info *dti,
 		struct node *refnode)
 {
 	struct node *wn, *nwn;	/* local fixup node, walk node, new */
-	uint32_t value_32;
+	fdt32_t value_32;
 	char **compp;
 	int i, depth;
 
diff --git a/scripts/dtc/srcpos.c b/scripts/dtc/srcpos.c
index aa3aad04cec4..9d38459902f3 100644
--- a/scripts/dtc/srcpos.c
+++ b/scripts/dtc/srcpos.c
@@ -252,7 +252,7 @@ srcpos_string(struct srcpos *pos)
 	const char *fname = "<no-file>";
 	char *pos_str;
 
-	if (pos)
+	if (pos->file && pos->file->name)
 		fname = pos->file->name;
 
 
diff --git a/scripts/dtc/srcpos.h b/scripts/dtc/srcpos.h
index 2cdfcd82e95e..7caca8257c6d 100644
--- a/scripts/dtc/srcpos.h
+++ b/scripts/dtc/srcpos.h
@@ -22,6 +22,7 @@
 
 #include <stdio.h>
 #include <stdbool.h>
+#include "util.h"
 
 struct srcfile_state {
 	FILE *f;
@@ -106,12 +107,10 @@ extern void srcpos_update(struct srcpos *pos, const char *text, int len);
 extern struct srcpos *srcpos_copy(struct srcpos *pos);
 extern char *srcpos_string(struct srcpos *pos);
 
-extern void srcpos_verror(struct srcpos *pos, const char *prefix,
-			  const char *fmt, va_list va)
-	__attribute__((format(printf, 3, 0)));
-extern void srcpos_error(struct srcpos *pos, const char *prefix,
-			 const char *fmt, ...)
-	__attribute__((format(printf, 3, 4)));
+extern void PRINTF(3, 0) srcpos_verror(struct srcpos *pos, const char *prefix,
+					const char *fmt, va_list va);
+extern void PRINTF(3, 4) srcpos_error(struct srcpos *pos, const char *prefix,
+				      const char *fmt, ...);
 
 extern void srcpos_set_line(char *f, int l);
 
diff --git a/scripts/dtc/treesource.c b/scripts/dtc/treesource.c
index c9d8967969f9..2461a3d068a0 100644
--- a/scripts/dtc/treesource.c
+++ b/scripts/dtc/treesource.c
@@ -137,7 +137,7 @@ static void write_propval_string(FILE *f, struct data val)
 static void write_propval_cells(FILE *f, struct data val)
 {
 	void *propend = val.val + val.len;
-	cell_t *cp = (cell_t *)val.val;
+	fdt32_t *cp = (fdt32_t *)val.val;
 	struct marker *m = val.markers;
 
 	fprintf(f, "<");
@@ -275,8 +275,8 @@ void dt_to_source(FILE *f, struct dt_info *dti)
 		for_each_label(re->labels, l)
 			fprintf(f, "%s: ", l->label);
 		fprintf(f, "/memreserve/\t0x%016llx 0x%016llx;\n",
-			(unsigned long long)re->re.address,
-			(unsigned long long)re->re.size);
+			(unsigned long long)re->address,
+			(unsigned long long)re->size);
 	}
 
 	write_tree_source_node(f, dti->dt, 0);
diff --git a/scripts/dtc/update-dtc-source.sh b/scripts/dtc/update-dtc-source.sh
index f5cde799db03..b8ebcc6722d2 100755
--- a/scripts/dtc/update-dtc-source.sh
+++ b/scripts/dtc/update-dtc-source.sh
@@ -36,10 +36,19 @@ DTC_SOURCE="checks.c data.c dtc.c dtc.h flattree.c fstree.c livetree.c srcpos.c
 DTC_GENERATED="dtc-lexer.lex.c dtc-parser.tab.c dtc-parser.tab.h"
 LIBFDT_SOURCE="Makefile.libfdt fdt.c fdt.h fdt_empty_tree.c fdt_ro.c fdt_rw.c fdt_strerror.c fdt_sw.c fdt_wip.c libfdt.h libfdt_env.h libfdt_internal.h"
 
+get_last_dtc_version() {
+	git log --oneline scripts/dtc/ | grep 'upstream' | head -1 | sed -e 's/^.* \(.*\)/\1/'
+}
+
+last_dtc_ver=$(get_last_dtc_version)
+
 # Build DTC
 cd $DTC_UPSTREAM_PATH
 make clean
 make check
+dtc_version=$(git describe HEAD)
+dtc_log=$(git log --oneline ${last_dtc_ver}..)
+
 
 # Copy the files into the Linux tree
 cd $DTC_LINUX_PATH
@@ -60,4 +69,13 @@ sed -i -- 's/#include <libfdt_env.h>/#include "libfdt_env.h"/g' ./libfdt/libfdt.
 sed -i -- 's/#include <fdt.h>/#include "fdt.h"/g' ./libfdt/libfdt.h
 git add ./libfdt/libfdt.h
 
-git commit -e -v -m "scripts/dtc: Update to upstream version [CHANGEME]"
+commit_msg=$(cat << EOF
+scripts/dtc: Update to upstream version ${dtc_version}
+
+This adds the following commits from upstream:
+
+${dtc_log}
+EOF
+)
+
+git commit -e -v -s -m "${commit_msg}"
diff --git a/scripts/dtc/util.c b/scripts/dtc/util.c
index 3550f86bd6df..9953c32a0244 100644
--- a/scripts/dtc/util.c
+++ b/scripts/dtc/util.c
@@ -396,7 +396,7 @@ void utilfdt_print_data(const char *data, int len)
 		} while (s < data + len);
 
 	} else if ((len % 4) == 0) {
-		const uint32_t *cell = (const uint32_t *)data;
+		const fdt32_t *cell = (const fdt32_t *)data;
 
 		printf(" = <");
 		for (i = 0, len /= 4; i < len; i++)
@@ -412,15 +412,16 @@ void utilfdt_print_data(const char *data, int len)
 	}
 }
 
-void util_version(void)
+void NORETURN util_version(void)
 {
 	printf("Version: %s\n", DTC_VERSION);
 	exit(0);
 }
 
-void util_usage(const char *errmsg, const char *synopsis,
-		const char *short_opts, struct option const long_opts[],
-		const char * const opts_help[])
+void NORETURN util_usage(const char *errmsg, const char *synopsis,
+			 const char *short_opts,
+			 struct option const long_opts[],
+			 const char * const opts_help[])
 {
 	FILE *fp = errmsg ? stderr : stdout;
 	const char a_arg[] = "<arg>";
diff --git a/scripts/dtc/util.h b/scripts/dtc/util.h
index f5c4f1b50d30..ad5f41199edb 100644
--- a/scripts/dtc/util.h
+++ b/scripts/dtc/util.h
@@ -25,9 +25,17 @@
  *                                                                   USA
  */
 
+#ifdef __GNUC__
+#define PRINTF(i, j)	__attribute__((format (printf, i, j)))
+#define NORETURN	__attribute__((noreturn))
+#else
+#define PRINTF(i, j)
+#define NORETURN
+#endif
+
 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
 
-static inline void __attribute__((noreturn)) die(const char *str, ...)
+static inline void NORETURN PRINTF(1, 2) die(const char *str, ...)
 {
 	va_list ap;
 
@@ -53,13 +61,14 @@ static inline void *xrealloc(void *p, size_t len)
 	void *new = realloc(p, len);
 
 	if (!new)
-		die("realloc() failed (len=%d)\n", len);
+		die("realloc() failed (len=%zd)\n", len);
 
 	return new;
 }
 
 extern char *xstrdup(const char *s);
-extern int xasprintf(char **strp, const char *fmt, ...);
+
+extern int PRINTF(2, 3) xasprintf(char **strp, const char *fmt, ...);
 extern char *join_path(const char *path, const char *name);
 
 /**
@@ -188,7 +197,7 @@ void utilfdt_print_data(const char *data, int len);
 /**
  * Show source version and exit
  */
-void util_version(void) __attribute__((noreturn));
+void NORETURN util_version(void);
 
 /**
  * Show usage and exit
@@ -202,9 +211,10 @@ void util_version(void) __attribute__((noreturn));
  * @param long_opts	The structure of long options
  * @param opts_help	An array of help strings (should align with long_opts)
  */
-void util_usage(const char *errmsg, const char *synopsis,
-		const char *short_opts, struct option const long_opts[],
-		const char * const opts_help[]) __attribute__((noreturn));
+void NORETURN util_usage(const char *errmsg, const char *synopsis,
+			 const char *short_opts,
+			 struct option const long_opts[],
+			 const char * const opts_help[]);
 
 /**
  * Show usage and exit
diff --git a/scripts/dtc/version_gen.h b/scripts/dtc/version_gen.h
index 16c2e53a85e3..1229e07b4912 100644
--- a/scripts/dtc/version_gen.h
+++ b/scripts/dtc/version_gen.h
@@ -1 +1 @@
-#define DTC_VERSION "DTC 1.4.2-g0931cea3"
+#define DTC_VERSION "DTC 1.4.4-g756ffc4f"
diff --git a/scripts/module-common.lds b/scripts/module-common.lds
index 9b6e246a45d0..d61b9e8678e8 100644
--- a/scripts/module-common.lds
+++ b/scripts/module-common.lds
@@ -20,8 +20,7 @@ SECTIONS {
 	__kcrctab_unused_gpl	0 : { *(SORT(___kcrctab_unused_gpl+*)) }
 	__kcrctab_gpl_future	0 : { *(SORT(___kcrctab_gpl_future+*)) }
 
-	. = ALIGN(8);
-	.init_array		0 : { *(SORT(.init_array.*)) *(.init_array) }
+	.init_array		0 : ALIGN(8) { *(SORT(.init_array.*)) *(.init_array) }
 
 	__jump_table		0 : ALIGN(8) { KEEP(*(__jump_table)) }
 }
diff --git a/scripts/spelling.txt b/scripts/spelling.txt
index b67e74b22826..eb38f49d4b75 100644
--- a/scripts/spelling.txt
+++ b/scripts/spelling.txt
@@ -179,6 +179,7 @@ bakup||backup
 baloon||balloon
 baloons||balloons
 bandwith||bandwidth
+banlance||balance
 batery||battery
 beacuse||because
 becasue||because
@@ -375,6 +376,8 @@ dictionnary||dictionary
 didnt||didn't
 diferent||different
 differrence||difference
+diffrent||different
+diffrentiate||differentiate
 difinition||definition
 diplay||display
 direectly||directly
@@ -605,6 +608,9 @@ interruptted||interrupted
 interupted||interrupted
 interupt||interrupt
 intial||initial
+intialisation||initialisation
+intialised||initialised
+intialise||initialise
 intialization||initialization
 intialized||initialized
 intialize||initialize
@@ -691,6 +697,7 @@ miximum||maximum
 mmnemonic||mnemonic
 mnay||many
 modulues||modules
+momery||memory
 monochorome||monochrome
 monochromo||monochrome
 monocrome||monochrome
@@ -890,6 +897,7 @@ registerd||registered
 registeresd||registered
 registes||registers
 registraration||registration
+regsiter||register
 regster||register
 regualar||regular
 reguator||regulator
diff --git a/scripts/ver_linux b/scripts/ver_linux
index 430b201f3e25..b51de8a7e2a3 100755
--- a/scripts/ver_linux
+++ b/scripts/ver_linux
@@ -1,4 +1,4 @@
-#!/bin/awk -f
+#!/usr/bin/awk -f
 # Before running this script please ensure that your PATH is
 # typical as you use for compilation/installation. I use
 # /bin /sbin /usr/bin /usr/sbin /usr/local/bin, but it may