Merge branch 'for-next-manual/oftree-linux-sync'

22 files changed, 1607 insertions, 402 deletions

diff --git a/arch/arm/boards/at91sam9x5ek/hw_version.c b/arch/arm/boards/at91sam9x5ek/hw_version.c
index 91af331194..1207a3e49d 100644
--- a/arch/arm/boards/at91sam9x5ek/hw_version.c
+++ b/arch/arm/boards/at91sam9x5ek/hw_version.c
@@ -234,13 +234,9 @@ static int cm_cogent_fixup(struct device_node *root)
 	int ret;
 	struct device_node *node;
 
-	of_tree_for_each_node(node, root) {
-		struct device_node *slotnode;
-
-		if (!of_device_is_compatible(node, "atmel,hsmci"))
-			continue;
-
-		slotnode = of_find_child_by_name(node, "slot");
+	for_each_compatible_node(node, NULL, "atmel,hsmci") {
+		struct device_node *slotnode =
+			of_get_child_by_name(node, "slot");
 		if (!slotnode)
 			continue;
 
diff --git a/arch/arm/boards/highbank/init.c b/arch/arm/boards/highbank/init.c
index d4a5c5acc3..46ecc88e47 100644
--- a/arch/arm/boards/highbank/init.c
+++ b/arch/arm/boards/highbank/init.c
@@ -35,25 +35,21 @@ static int hb_fixup(struct device_node *root)
 	__be32 latency;
 
 	if (!(reg & HB_PWRDOM_STAT_SATA)) {
-		of_tree_for_each_node(node, root) {
-			if (of_device_is_compatible(node, "calxeda,hb-ahci"))
-				of_set_property(node, "status", "disabled",
-						sizeof("disabled"), 1);
-		}
+		for_each_compatible_node(node, NULL, "calxeda,hb-ahci")
+			of_set_property(node, "status", "disabled",
+					sizeof("disabled"), 1);
 	}
 
 	if (!(reg & HB_PWRDOM_STAT_EMMC)) {
-		of_tree_for_each_node(node, root) {
-			if (of_device_is_compatible(node, "calxeda,hb-sdhci"))
-				of_set_property(node, "status", "disabled",
-						sizeof("disabled"), 1);
-		}
+		for_each_compatible_node(node, NULL, "calxeda,hb-sdhci")
+			of_set_property(node, "status", "disabled",
+					sizeof("disabled"), 1);
 	}
 
 	if ((opp_table[0] >> 16) != HB_OPP_VERSION)
 		return 0;
 
-	node = of_find_node_by_path(root, "/cpus/cpu@0");
+	node = of_find_node_by_path("/cpus/cpu@0");
 	if (!node)
 		return 0;
 
@@ -89,7 +85,7 @@ static int highbank_mem_init(void)
 
 	of_set_root_node(root);
 
-	np = of_find_node_by_path(root, "/memory");
+	np = of_find_node_by_path("/memory");
 	if (!np) {
 		pr_warn("no memory node use default configuration\n");
 		goto not_found;
diff --git a/arch/ppc/include/asm/string.h b/arch/ppc/include/asm/string.h
index d912a6b5fe..33d143f04e 100644
--- a/arch/ppc/include/asm/string.h
+++ b/arch/ppc/include/asm/string.h
@@ -13,8 +13,6 @@
 #define __HAVE_ARCH_MEMCMP
 #define __HAVE_ARCH_MEMCHR
 
-extern int strcasecmp(const char *, const char *);
-extern int strncasecmp(const char *, const char *, int);
 extern char * strcpy(char *,const char *);
 extern char * strncpy(char *,const char *, __kernel_size_t);
 extern __kernel_size_t strlen(const char *);
diff --git a/arch/ppc/mach-mpc5xxx/cpu.c b/arch/ppc/mach-mpc5xxx/cpu.c
index 99f16ebf1d..0ece4a9ed9 100644
--- a/arch/ppc/mach-mpc5xxx/cpu.c
+++ b/arch/ppc/mach-mpc5xxx/cpu.c
@@ -83,7 +83,7 @@ static int of_mpc5200_fixup(struct device_node *root)
 
 	int div = in_8((void*)CFG_MBAR + 0x204) & 0x0020 ? 8 : 4;
 
-	node = of_find_node_by_path(root, "/cpus/PowerPC,5200@0");
+	node = of_find_node_by_path("/cpus/PowerPC,5200@0");
 	if (!node)
 		return -EINVAL;
 
@@ -91,7 +91,7 @@ static int of_mpc5200_fixup(struct device_node *root)
 	of_property_write_u32(node, "bus-frequency", get_bus_clock());
 	of_property_write_u32(node, "clock-frequency", get_cpu_clock());
 
-	node = of_find_node_by_path(root, "/soc5200@f0000000");
+	node = of_find_node_by_path("/soc5200@f0000000");
 	if (!node)
 		return -EINVAL;
 
diff --git a/commands/of_node.c b/commands/of_node.c
index 0249d9725b..e60ef66d38 100644
--- a/commands/of_node.c
+++ b/commands/of_node.c
@@ -81,7 +81,7 @@ static int do_of_node(int argc, char *argv[])
 		if (!path)
 			return COMMAND_ERROR_USAGE;
 
-		node = of_find_node_by_path(root, path);
+		node = of_find_node_by_path(path);
 		if (!node) {
 			printf("Cannot find nodepath %s\n", path);
 			return -ENOENT;
diff --git a/commands/of_property.c b/commands/of_property.c
index 44bb38801e..8ffe30b25f 100644
--- a/commands/of_property.c
+++ b/commands/of_property.c
@@ -175,7 +175,7 @@ static int do_of_property(int argc, char *argv[])
 	int set = 0;
 	int ret;
 	char *path = NULL, *propname = NULL;
-	struct device_node *root, *node = NULL;
+	struct device_node *node = NULL;
 	struct property *pp = NULL;
 
 	while ((opt = getopt(argc, argv, "ds")) > 0) {
@@ -194,15 +194,9 @@ static int do_of_property(int argc, char *argv[])
 	if (optind == argc)
 		return COMMAND_ERROR_USAGE;
 
-	root = of_get_root_node();
-	if (!root) {
-		printf("root node not set\n");
-		return -ENOENT;
-	}
-
 	if (optind < argc) {
 		path = argv[optind];
-		node = of_find_node_by_path(root, path);
+		node = of_find_node_by_path(path);
 		if (!node) {
 			printf("Cannot find nodepath %s\n", path);
 			return -ENOENT;
@@ -212,7 +206,7 @@ static int do_of_property(int argc, char *argv[])
 	if (optind + 1 < argc) {
 		propname = argv[optind + 1];
 
-		pp = of_find_property(node, propname);
+		pp = of_find_property(node, propname, NULL);
 		if (!set && !pp) {
 			printf("Cannot find property %s\n", propname);
 			return -ENOENT;
diff --git a/commands/oftree.c b/commands/oftree.c
index 468235a043..914951735b 100644
--- a/commands/oftree.c
+++ b/commands/oftree.c
@@ -164,16 +164,7 @@ static int do_oftree(int argc, char *argv[])
 			of_print_nodes(root, 0);
 			of_free(root);
 		} else {
-			struct device_node *root, *n;
-
-			root = of_get_root_node();
-			if (!root) {
-				ret = -ENOENT;
-				goto out;
-			}
-
-			n = of_find_node_by_path(root, node);
-
+			struct device_node *n = of_find_node_by_path(node);
 			if (!n) {
 				ret = -ENOENT;
 				goto out;
diff --git a/common/oftree.c b/common/oftree.c
index 475d418849..aff4c28852 100644
--- a/common/oftree.c
+++ b/common/oftree.c
@@ -100,7 +100,7 @@ void of_print_property(const void *data, int len)
 
 void of_print_cmdline(struct device_node *root)
 {
-	struct device_node *node = of_find_node_by_path(root, "/chosen");
+	struct device_node *node = of_find_node_by_path("/chosen");
 	const char *cmdline;
 
 	if (!node) {
diff --git a/drivers/i2c/i2c.c b/drivers/i2c/i2c.c
index b63d94604d..3e095476a9 100644
--- a/drivers/i2c/i2c.c
+++ b/drivers/i2c/i2c.c
@@ -278,7 +278,7 @@ void of_i2c_register_devices(struct i2c_adapter *adap)
 	if (!IS_ENABLED(CONFIG_OFDEVICE) || !adap->dev.device_node)
 		return;
 
-	device_node_for_nach_child(adap->dev.device_node, n) {
+	for_each_child_of_node(adap->dev.device_node, n) {
 		struct i2c_board_info info = {};
 		struct i2c_client *result;
 		const __be32 *addr;
diff --git a/drivers/mfd/stmpe-i2c.c b/drivers/mfd/stmpe-i2c.c
index d785430d12..3a2db923fd 100644
--- a/drivers/mfd/stmpe-i2c.c
+++ b/drivers/mfd/stmpe-i2c.c
@@ -116,7 +116,7 @@ static struct stmpe_platform_data *stmpe_of_probe(struct device_d *dev)
 
 	pdata = xzalloc(sizeof(*pdata));
 
-	device_node_for_nach_child(dev->device_node, node) {
+	for_each_child_of_node(dev->device_node, node) {
 		if (!strcmp(node->name, "stmpe_gpio")) {
 			pdata->blocks |= STMPE_BLOCK_GPIO;
 		}
diff --git a/drivers/of/base.c b/drivers/of/base.c
index 4241e65b3f..63ff6478f4 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -28,6 +28,14 @@
 #include <linux/amba/bus.h>
 #include <linux/err.h>
 
+/*
+ * Iterate over all nodes of a tree. As a devicetree does not
+ * have a dedicated list head, the start node (usually the root
+ * node) will not be iterated over.
+ */
+#define of_tree_for_each_node(node, root) \
+	list_for_each_entry(node, &root->list, list)
+
 /**
  * struct alias_prop - Alias property in 'aliases' node
  * @link:	List node to link the structure in aliases_lookup list
@@ -102,16 +110,21 @@ static void of_bus_count_cells(struct device_node *dev,
 	of_bus_default_count_cells(dev, addrc, sizec);
 }
 
-struct property *of_find_property(const struct device_node *node, const char *name)
+struct property *of_find_property(const struct device_node *np,
+				  const char *name, int *lenp)
 {
-	struct property *p;
+	struct property *pp;
 
-	if (!node)
+	if (!np)
 		return NULL;
 
-	list_for_each_entry(p, &node->properties, list)
-		if (!strcmp(p->name, name))
-			return p;
+	list_for_each_entry(pp, &np->properties, list)
+		if (of_prop_cmp(pp->name, name) == 0) {
+			if (lenp)
+				*lenp = pp->length;
+			return pp;
+		}
+
 	return NULL;
 }
 EXPORT_SYMBOL(of_find_property);
@@ -135,7 +148,7 @@ static void of_alias_add(struct alias_prop *ap, struct device_node *np,
  * the global lookup table with the properties.  It returns the
  * number of alias_prop found, or error code in error case.
  */
-static void of_alias_scan(void)
+void of_alias_scan(void)
 {
 	struct property *pp;
 	struct alias_prop *app, *tmp;
@@ -148,7 +161,7 @@ static void of_alias_scan(void)
 	if (!root_node)
 		return;
 
-	of_aliases = of_find_node_by_path(root_node, "/aliases");
+	of_aliases = of_find_node_by_path("/aliases");
 	if (!of_aliases)
 		return;
 
@@ -160,12 +173,12 @@ static void of_alias_scan(void)
 		int id, len;
 
 		/* Skip those we do not want to proceed */
-		if (!strcmp(pp->name, "name") ||
-		    !strcmp(pp->name, "phandle") ||
-		    !strcmp(pp->name, "linux,phandle"))
+		if (!of_prop_cmp(pp->name, "name") ||
+		    !of_prop_cmp(pp->name, "phandle") ||
+		    !of_prop_cmp(pp->name, "linux,phandle"))
 			continue;
 
-		np = of_find_node_by_path(root_node, pp->value);
+		np = of_find_node_by_path(pp->value);
 		if (!np)
 			continue;
 
@@ -187,6 +200,7 @@ static void of_alias_scan(void)
 		of_alias_add(ap, np, id, start, len);
 	}
 }
+EXPORT_SYMBOL(of_alias_scan);
 
 /**
  * of_alias_get_id - Get alias id for the given device_node
@@ -202,7 +216,7 @@ int of_alias_get_id(struct device_node *np, const char *stem)
 	int id = -ENODEV;
 
 	list_for_each_entry(app, &aliases_lookup, link) {
-		if (strcmp(app->stem, stem) != 0)
+		if (of_node_cmp(app->stem, stem) != 0)
 			continue;
 
 		if (np == app->np) {
@@ -220,7 +234,7 @@ const char *of_alias_get(struct device_node *np)
 	struct property *pp;
 
 	list_for_each_entry(pp, &of_aliases->properties, list) {
-		if (!strcmp(np->full_name, pp->value))
+		if (!of_node_cmp(np->full_name, pp->value))
 			return pp->name;
 	}
 
@@ -240,7 +254,7 @@ u64 of_translate_address(struct device_node *node, const __be32 *in_addr)
 			return addr;
 
 		node = node->parent;
-		p = of_find_property(node, "ranges");
+		p = of_find_property(node, "ranges", NULL);
 		if (!p && node->parent)
 			return OF_BAD_ADDR;
 		of_bus_count_cells(node, &na, &nc);
@@ -275,13 +289,7 @@ EXPORT_SYMBOL(of_find_node_by_phandle);
 const void *of_get_property(const struct device_node *np, const char *name,
 			 int *lenp)
 {
-	struct property *pp = of_find_property(np, name);
-
-	if (!pp)
-		return NULL;
-
-	if (lenp)
-		*lenp = pp->length;
+	struct property *pp = of_find_property(np, name, lenp);
 
 	return pp ? pp->value : NULL;
 }
@@ -300,7 +308,7 @@ int of_device_is_compatible(const struct device_node *device,
 	if (cp == NULL)
 		return 0;
 	while (cplen > 0) {
-		if (strcmp(cp, compat) == 0)
+		if (of_compat_cmp(cp, compat, strlen(compat)) == 0)
 			return 1;
 		l = strlen(cp) + 1;
 		cp += l;
@@ -312,6 +320,88 @@ int of_device_is_compatible(const struct device_node *device,
 EXPORT_SYMBOL(of_device_is_compatible);
 
 /**
+ *	of_find_node_by_name - Find a node by its "name" property
+ *	@from:	The node to start searching from or NULL, the node
+ *		you pass will not be searched, only the next one
+ *		will; typically, you pass what the previous call
+ *		returned.
+ *	@name:	The name string to match against
+ *
+ *	Returns a pointer to the node found or NULL.
+ */
+struct device_node *of_find_node_by_name(struct device_node *from,
+	const char *name)
+{
+	struct device_node *np;
+
+	if (!from)
+		from = root_node;
+
+	of_tree_for_each_node(np, from)
+		if (np->name && !of_node_cmp(np->name, name))
+			return np;
+
+	return NULL;
+}
+EXPORT_SYMBOL(of_find_node_by_name);
+
+/**
+ *	of_find_compatible_node - Find a node based on type and one of the
+ *                                tokens in its "compatible" property
+ *	@from:		The node to start searching from or NULL, the node
+ *			you pass will not be searched, only the next one
+ *			will; typically, you pass what the previous call
+ *			returned.
+ *	@type:		The type string to match "device_type" or NULL to ignore
+ *                      (currently always ignored in barebox)
+ *	@compatible:	The string to match to one of the tokens in the device
+ *			"compatible" list.
+ *
+ *	Returns a pointer to the node found or NULL.
+ */
+struct device_node *of_find_compatible_node(struct device_node *from,
+	const char *type, const char *compatible)
+{
+	struct device_node *np;
+
+	if (!from)
+		from = root_node;
+
+	of_tree_for_each_node(np, from)
+		if (of_device_is_compatible(np, compatible))
+			return np;
+
+	return NULL;
+}
+EXPORT_SYMBOL(of_find_compatible_node);
+
+/**
+ *	of_find_node_with_property - Find a node which has a property with
+ *                                   the given name.
+ *	@from:		The node to start searching from or NULL, the node
+ *			you pass will not be searched, only the next one
+ *			will; typically, you pass what the previous call
+ *			returned.
+ *	@prop_name:	The name of the property to look for.
+ *
+ *	Returns a pointer to the node found or NULL.
+ */
+struct device_node *of_find_node_with_property(struct device_node *from,
+	const char *prop_name)
+{
+	struct device_node *np;
+
+	of_tree_for_each_node(np, from) {
+		struct property *pp = of_find_property(np, prop_name, NULL);
+		if (pp)
+			return np;
+	}
+
+	return NULL;
+}
+EXPORT_SYMBOL(of_find_node_with_property);
+
+/**
  * of_match_node - Tell if an device_node has a matching of_match structure
  *      @matches:       array of of device match structures to search in
  *      @node:          the of device structure to match against
@@ -321,6 +411,9 @@ EXPORT_SYMBOL(of_device_is_compatible);
 const struct of_device_id *of_match_node(const struct of_device_id *matches,
 					 const struct device_node *node)
 {
+	if (!matches || !node)
+		return NULL;
+
 	while (matches->compatible) {
 		if (of_device_is_compatible(node, matches->compatible) == 1)
 			return matches;
@@ -330,6 +423,43 @@ const struct of_device_id *of_match_node(const struct of_device_id *matches,
 	return NULL;
 }
 
+/**
+ *	of_find_matching_node_and_match - Find a node based on an of_device_id
+ *					  match table.
+ *	@from:		The node to start searching from or NULL, the node
+ *			you pass will not be searched, only the next one
+ *			will; typically, you pass what the previous call
+ *			returned.
+ *	@matches:	array of of device match structures to search in
+ *	@match		Updated to point at the matches entry which matched
+ *
+ *	Returns a pointer to the node found or NULL.
+ */
+struct device_node *of_find_matching_node_and_match(struct device_node *from,
+					const struct of_device_id *matches,
+					const struct of_device_id **match)
+{
+	struct device_node *np;
+
+	if (match)
+		*match = NULL;
+
+	if (!from)
+		from = root_node;
+
+	of_tree_for_each_node(np, from) {
+		const struct of_device_id *m = of_match_node(matches, np);
+		if (m) {
+			if (match)
+				*match = m;
+			return np;
+		}
+	}
+
+	return NULL;
+}
+EXPORT_SYMBOL(of_find_matching_node_and_match);
+
 int of_match(struct device_d *dev, struct driver_d *drv)
 {
 	const struct of_device_id *id;
@@ -345,12 +475,137 @@ int of_match(struct device_d *dev, struct driver_d *drv)
 EXPORT_SYMBOL(of_match);
 
 /**
+ * of_find_property_value_of_size
+ *
+ * @np:		device node from which the property value is to be read.
+ * @propname:	name of the property to be searched.
+ * @len:	requested length of property value
+ *
+ * Search for a property in a device node and valid the requested size.
+ * Returns the property value on success, -EINVAL if the property does not
+ *  exist, -ENODATA if property does not have a value, and -EOVERFLOW if the
+ * property data isn't large enough.
+ *
+ */
+static void *of_find_property_value_of_size(const struct device_node *np,
+			const char *propname, u32 len)
+{
+	struct property *prop = of_find_property(np, propname, NULL);
+
+	if (!prop)
+		return ERR_PTR(-EINVAL);
+	if (!prop->value)
+		return ERR_PTR(-ENODATA);
+	if (len > prop->length)
+		return ERR_PTR(-EOVERFLOW);
+
+	return prop->value;
+}
+
+/**
+ * of_property_read_u32_index - Find and read a u32 from a multi-value property.
+ *
+ * @np:		device node from which the property value is to be read.
+ * @propname:	name of the property to be searched.
+ * @index:	index of the u32 in the list of values
+ * @out_value:	pointer to return value, modified only if no error.
+ *
+ * Search for a property in a device node and read nth 32-bit value from
+ * it. Returns 0 on success, -EINVAL if the property does not exist,
+ * -ENODATA if property does not have a value, and -EOVERFLOW if the
+ * property data isn't large enough.
+ *
+ * The out_value is modified only if a valid u32 value can be decoded.
+ */
+int of_property_read_u32_index(const struct device_node *np,
+				       const char *propname,
+				       u32 index, u32 *out_value)
+{
+	const u32 *val = of_find_property_value_of_size(np, propname,
+					((index + 1) * sizeof(*out_value)));
+
+	if (IS_ERR(val))
+		return PTR_ERR(val);
+
+	*out_value = be32_to_cpup(((__be32 *)val) + index);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(of_property_read_u32_index);
+
+/**
+ * of_property_read_u8_array - Find and read an array of u8 from a property.
+ *
+ * @np:		device node from which the property value is to be read.
+ * @propname:	name of the property to be searched.
+ * @out_value:	pointer to return value, modified only if return value is 0.
+ * @sz:		number of array elements to read
+ *
+ * Search for a property in a device node and read 8-bit value(s) from
+ * it. Returns 0 on success, -EINVAL if the property does not exist,
+ * -ENODATA if property does not have a value, and -EOVERFLOW if the
+ * property data isn't large enough.
+ *
+ * dts entry of array should be like:
+ *	property = /bits/ 8 <0x50 0x60 0x70>;
+ *
+ * The out_value is modified only if a valid u8 value can be decoded.
+ */
+int of_property_read_u8_array(const struct device_node *np,
+			const char *propname, u8 *out_values, size_t sz)
+{
+	const u8 *val = of_find_property_value_of_size(np, propname,
+						(sz * sizeof(*out_values)));
+
+	if (IS_ERR(val))
+		return PTR_ERR(val);
+
+	while (sz--)
+		*out_values++ = *val++;
+	return 0;
+}
+EXPORT_SYMBOL_GPL(of_property_read_u8_array);
+
+/**
+ * of_property_read_u16_array - Find and read an array of u16 from a property.
+ *
+ * @np:		device node from which the property value is to be read.
+ * @propname:	name of the property to be searched.
+ * @out_value:	pointer to return value, modified only if return value is 0.
+ * @sz:		number of array elements to read
+ *
+ * Search for a property in a device node and read 16-bit value(s) from
+ * it. Returns 0 on success, -EINVAL if the property does not exist,
+ * -ENODATA if property does not have a value, and -EOVERFLOW if the
+ * property data isn't large enough.
+ *
+ * dts entry of array should be like:
+ *	property = /bits/ 16 <0x5000 0x6000 0x7000>;
+ *
+ * The out_value is modified only if a valid u16 value can be decoded.
+ */
+int of_property_read_u16_array(const struct device_node *np,
+			const char *propname, u16 *out_values, size_t sz)
+{
+	const __be16 *val = of_find_property_value_of_size(np, propname,
+						(sz * sizeof(*out_values)));
+
+	if (IS_ERR(val))
+		return PTR_ERR(val);
+
+	while (sz--)
+		*out_values++ = be16_to_cpup(val++);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(of_property_read_u16_array);
+
+/**
  * of_property_read_u32_array - Find and read an array of 32 bit integers
  * from a property.
  *
  * @np:		device node from which the property value is to be read.
  * @propname:	name of the property to be searched.
  * @out_value:	pointer to return value, modified only if return value is 0.
+ * @sz:		number of array elements to read
  *
  * Search for a property in a device node and read 32-bit value(s) from
  * it. Returns 0 on success, -EINVAL if the property does not exist,
@@ -363,60 +618,445 @@ int of_property_read_u32_array(const struct device_node *np,
 			       const char *propname, u32 *out_values,
 			       size_t sz)
 {
-	struct property *prop = of_find_property(np, propname);
-	const __be32 *val;
+	const __be32 *val = of_find_property_value_of_size(np, propname,
+						(sz * sizeof(*out_values)));
+
+	if (IS_ERR(val))
+		return PTR_ERR(val);
+
+	while (sz--)
+		*out_values++ = be32_to_cpup(val++);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(of_property_read_u32_array);
 
+/**
+ * of_property_read_u64 - Find and read a 64 bit integer from a property
+ * @np:		device node from which the property value is to be read.
+ * @propname:	name of the property to be searched.
+ * @out_value:	pointer to return value, modified only if return value is 0.
+ *
+ * Search for a property in a device node and read a 64-bit value from
+ * it. Returns 0 on success, -EINVAL if the property does not exist,
+ * -ENODATA if property does not have a value, and -EOVERFLOW if the
+ * property data isn't large enough.
+ *
+ * The out_value is modified only if a valid u64 value can be decoded.
+ */
+int of_property_read_u64(const struct device_node *np, const char *propname,
+			 u64 *out_value)
+{
+	const __be32 *val = of_find_property_value_of_size(np, propname,
+						sizeof(*out_value));
+
+	if (IS_ERR(val))
+		return PTR_ERR(val);
+
+	*out_value = of_read_number(val, 2);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(of_property_read_u64);
+
+/**
+ * of_property_read_string - Find and read a string from a property
+ * @np:		device node from which the property value is to be read.
+ * @propname:	name of the property to be searched.
+ * @out_string:	pointer to null terminated return string, modified only if
+ *		return value is 0.
+ *
+ * Search for a property in a device tree node and retrieve a null
+ * terminated string value (pointer to data, not a copy). Returns 0 on
+ * success, -EINVAL if the property does not exist, -ENODATA if property
+ * does not have a value, and -EILSEQ if the string is not null-terminated
+ * within the length of the property data.
+ *
+ * The out_string pointer is modified only if a valid string can be decoded.
+ */
+int of_property_read_string(struct device_node *np, const char *propname,
+				const char **out_string)
+{
+	struct property *prop = of_find_property(np, propname, NULL);
 	if (!prop)
 		return -EINVAL;
 	if (!prop->value)
 		return -ENODATA;
-	if ((sz * sizeof(*out_values)) > prop->length)
-		return -EOVERFLOW;
+	if (strnlen(prop->value, prop->length) >= prop->length)
+		return -EILSEQ;
+	*out_string = prop->value;
+	return 0;
+}
+EXPORT_SYMBOL_GPL(of_property_read_string);
+
+/**
+ * of_property_read_string_index - Find and read a string from a multiple
+ * strings property.
+ * @np:		device node from which the property value is to be read.
+ * @propname:	name of the property to be searched.
+ * @index:	index of the string in the list of strings
+ * @out_string:	pointer to null terminated return string, modified only if
+ *		return value is 0.
+ *
+ * Search for a property in a device tree node and retrieve a null
+ * terminated string value (pointer to data, not a copy) in the list of strings
+ * contained in that property.
+ * Returns 0 on success, -EINVAL if the property does not exist, -ENODATA if
+ * property does not have a value, and -EILSEQ if the string is not
+ * null-terminated within the length of the property data.
+ *
+ * The out_string pointer is modified only if a valid string can be decoded.
+ */
+int of_property_read_string_index(struct device_node *np, const char *propname,
+				  int index, const char **output)
+{
+	struct property *prop = of_find_property(np, propname, NULL);
+	int i = 0;
+	size_t l = 0, total = 0;
+	const char *p;
+
+	if (!prop)
+		return -EINVAL;
+	if (!prop->value)
+		return -ENODATA;
+	if (strnlen(prop->value, prop->length) >= prop->length)
+		return -EILSEQ;
+
+	p = prop->value;
+
+	for (i = 0; total < prop->length; total += l, p += l) {
+		l = strlen(p) + 1;
+		if (i++ == index) {
+			*output = p;
+			return 0;
+		}
+	}
+	return -ENODATA;
+}
+EXPORT_SYMBOL_GPL(of_property_read_string_index);
+
+/**
+ * of_property_match_string() - Find string in a list and return index
+ * @np: pointer to node containing string list property
+ * @propname: string list property name
+ * @string: pointer to string to search for in string list
+ *
+ * This function searches a string list property and returns the index
+ * of a specific string value.
+ */
+int of_property_match_string(struct device_node *np, const char *propname,
+			     const char *string)
+{
+	struct property *prop = of_find_property(np, propname, NULL);
+	size_t l;
+	int i;
+	const char *p, *end;
+
+	if (!prop)
+		return -EINVAL;
+	if (!prop->value)
+		return -ENODATA;
+
+	p = prop->value;
+	end = p + prop->length;
+
+	for (i = 0; p < end; i++, p += l) {
+		l = strlen(p) + 1;
+		if (p + l > end)
+			return -EILSEQ;
+		pr_debug("comparing %s with %s\n", string, p);
+		if (strcmp(string, p) == 0)
+			return i; /* Found it; return index */
+	}
+	return -ENODATA;
+}
+EXPORT_SYMBOL_GPL(of_property_match_string);
+
+/**
+ * of_property_count_strings - Find and return the number of strings from a
+ * multiple strings property.
+ * @np:		device node from which the property value is to be read.
+ * @propname:	name of the property to be searched.
+ *
+ * Search for a property in a device tree node and retrieve the number of null
+ * terminated string contain in it. Returns the number of strings on
+ * success, -EINVAL if the property does not exist, -ENODATA if property
+ * does not have a value, and -EILSEQ if the string is not null-terminated
+ * within the length of the property data.
+ */
+int of_property_count_strings(struct device_node *np, const char *propname)
+{
+	struct property *prop = of_find_property(np, propname, NULL);
+	int i = 0;
+	size_t l = 0, total = 0;
+	const char *p;
+
+	if (!prop)
+		return -EINVAL;
+	if (!prop->value)
+		return -ENODATA;
+	if (strnlen(prop->value, prop->length) >= prop->length)
+		return -EILSEQ;
+
+	p = prop->value;
+
+	for (i = 0; total < prop->length; total += l, p += l, i++)
+		l = strlen(p) + 1;
+
+	return i;
+}
+EXPORT_SYMBOL_GPL(of_property_count_strings);
+
+const __be32 *of_prop_next_u32(struct property *prop, const __be32 *cur,
+			u32 *pu)
+{
+	const void *curv = cur;
+
+	if (!prop)
+		return NULL;
+
+	if (!cur) {
+		curv = prop->value;
+		goto out_val;
+	}
+
+	curv += sizeof(*cur);
+	if (curv >= prop->value + prop->length)
+		return NULL;
+
+out_val:
+	*pu = be32_to_cpup(curv);
+	return curv;
+}
+EXPORT_SYMBOL_GPL(of_prop_next_u32);
+
+const char *of_prop_next_string(struct property *prop, const char *cur)
+{
+	const void *curv = cur;
+
+	if (!prop)
+		return NULL;
+
+	if (!cur)
+		return prop->value;
+
+	curv += strlen(cur) + 1;
+	if (curv >= prop->value + prop->length)
+		return NULL;
+
+	return curv;
+}
+EXPORT_SYMBOL_GPL(of_prop_next_string);
+
+/**
+ * of_property_write_bool - Create/Delete empty (bool) property.
+ *
+ * @np:		device node from which the property is to be set.
+ * @propname:	name of the property to be set.
+ *
+ * Search for a property in a device node and create or delete the property.
+ * If the property already exists and write value is false, the property is
+ * deleted. If write value is true and the property does not exist, it is
+ * created. Returns 0 on success, -ENOMEM if the property or array
+ * of elements cannot be created.
+ */
+int of_property_write_bool(struct device_node *np, const char *propname,
+			   const bool value)
+{
+	struct property *prop = of_find_property(np, propname, NULL);
+
+	if (!value) {
+		if (prop)
+			of_delete_property(prop);
+		return 0;
+	}
+
+	if (!prop)
+		prop = of_new_property(np, propname, NULL, 0);
+	if (!prop)
+		return -ENOMEM;
+
+	return 0;
+}
+
+/**
+ * of_property_write_u8_array - Write an array of u8 to a property. If
+ * the property does not exist, it will be created and appended to the given
+ * device node.
+ *
+ * @np:		device node to which the property value is to be written.
+ * @propname:	name of the property to be written.
+ * @values:	pointer to array elements to write.
+ * @sz:		number of array elements to write.
+ *
+ * Search for a property in a device node and write 8-bit value(s) to
+ * it. If the property does not exist, it will be created and appended to
+ * the device node. Returns 0 on success, -ENOMEM if the property or array
+ * of elements cannot be created.
+ */
+int of_property_write_u8_array(struct device_node *np,
+			       const char *propname, const u8 *values,
+			       size_t sz)
+{
+	struct property *prop = of_find_property(np, propname, NULL);
+	u8 *val;
+
+	if (prop)
+		of_delete_property(prop);
+
+	prop = of_new_property(np, propname, NULL, sizeof(*val) * sz);
+	if (!prop)
+		return -ENOMEM;
 
 	val = prop->value;
 	while (sz--)
-		*out_values++ = be32_to_cpup(val++);
+		*val++ = *values++;
+
 	return 0;
 }
-EXPORT_SYMBOL_GPL(of_property_read_u32_array);
 
+/**
+ * of_property_write_u16_array - Write an array of u16 to a property. If
+ * the property does not exist, it will be created and appended to the given
+ * device node.
+ *
+ * @np:		device node to which the property value is to be written.
+ * @propname:	name of the property to be written.
+ * @values:	pointer to array elements to write.
+ * @sz:		number of array elements to write.
+ *
+ * Search for a property in a device node and write 16-bit value(s) to
+ * it. If the property does not exist, it will be created and appended to
+ * the device node. Returns 0 on success, -ENOMEM if the property or array
+ * of elements cannot be created.
+ */
+int of_property_write_u16_array(struct device_node *np,
+				const char *propname, const u16 *values,
+				size_t sz)
+{
+	struct property *prop = of_find_property(np, propname, NULL);
+	__be16 *val;
+
+	if (prop)
+		of_delete_property(prop);
+
+	prop = of_new_property(np, propname, NULL, sizeof(*val) * sz);
+	if (!prop)
+		return -ENOMEM;
+
+	val = prop->value;
+	while (sz--)
+		*val++ = cpu_to_be16(*values++);
+
+	return 0;
+}
+
+/**
+ * of_property_write_u32_array - Write an array of u32 to a property. If
+ * the property does not exist, it will be created and appended to the given
+ * device node.
+ *
+ * @np:		device node to which the property value is to be written.
+ * @propname:	name of the property to be written.
+ * @values:	pointer to array elements to write.
+ * @sz:		number of array elements to write.
+ *
+ * Search for a property in a device node and write 32-bit value(s) to
+ * it. If the property does not exist, it will be created and appended to
+ * the device node. Returns 0 on success, -ENOMEM if the property or array
+ * of elements cannot be created.
+ */
 int of_property_write_u32_array(struct device_node *np,
 				const char *propname, const u32 *values,
 				size_t sz)
 {
-	struct property *prop = of_find_property(np, propname);
+	struct property *prop = of_find_property(np, propname, NULL);
 	__be32 *val;
 
-	if (!prop)
-		prop = of_new_property(np, propname, NULL, 0);
+	if (prop)
+		of_delete_property(prop);
+
+	prop = of_new_property(np, propname, NULL, sizeof(*val) * sz);
 	if (!prop)
 		return -ENOMEM;
 
-	free(prop->value);
+	val = prop->value;
+	while (sz--)
+		*val++ = cpu_to_be32(*values++);
 
-	prop->value = malloc(sizeof(__be32) * sz);
-	if (!prop->value)
+	return 0;
+}
+
+/**
+ * of_property_write_u64_array - Write an array of u64 to a property. If
+ * the property does not exist, it will be created and appended to the given
+ * device node.
+ *
+ * @np:		device node to which the property value is to be written.
+ * @propname:	name of the property to be written.
+ * @values:	pointer to array elements to write.
+ * @sz:		number of array elements to write.
+ *
+ * Search for a property in a device node and write 64-bit value(s) to
+ * it. If the property does not exist, it will be created and appended to
+ * the device node. Returns 0 on success, -ENOMEM if the property or array
+ * of elements cannot be created.
+ */
+int of_property_write_u64_array(struct device_node *np,
+				const char *propname, const u64 *values,
+				size_t sz)
+{
+	struct property *prop = of_find_property(np, propname, NULL);
+	__be32 *val;
+
+	if (prop)
+		of_delete_property(prop);
+
+	prop = of_new_property(np, propname, NULL, 2 * sizeof(*val) * sz);
+	if (!prop)
 		return -ENOMEM;
 
 	val = prop->value;
+	while (sz--) {
+		of_write_number(val, *values++, 2);
+		val += 2;
+	}
 
-	while (sz--)
-		*val++ = cpu_to_be32(*values++);
 	return 0;
 }
 
 /**
- * of_parse_phandles_with_args - Find a node pointed by phandle in a list
+ * of_parse_phandle - Resolve a phandle property to a device_node pointer
+ * @np: Pointer to device node holding phandle property
+ * @phandle_name: Name of property holding a phandle value
+ * @index: For properties holding a table of phandles, this is the index into
+ *         the table
+ *
+ * Returns the device_node pointer found or NULL.
+ */
+struct device_node *of_parse_phandle(const struct device_node *np,
+				     const char *phandle_name, int index)
+{
+	const __be32 *phandle;
+	int size;
+
+	phandle = of_get_property(np, phandle_name, &size);
+	if ((!phandle) || (size < sizeof(*phandle) * (index + 1)))
+		return NULL;
+
+	return of_find_node_by_phandle(be32_to_cpup(phandle + index));
+}
+EXPORT_SYMBOL(of_parse_phandle);
+
+/**
+ * of_parse_phandle_with_args() - Find a node pointed by phandle in a list
  * @np:		pointer to a device tree node containing a list
  * @list_name:	property name that contains a list
  * @cells_name:	property name that specifies phandles' arguments count
  * @index:	index of a phandle to parse out
- * @out_node:	optional pointer to device_node struct pointer (will be filled)
- * @out_args:	optional pointer to arguments pointer (will be filled)
+ * @out_args:	optional pointer to output arguments structure (will be filled)
  *
  * This function is useful to parse lists of phandles and their arguments.
- * Returns 0 on success and fills out_node and out_args, on error returns
- * appropriate errno value.
+ * Returns 0 on success and fills out_args, on error returns appropriate
+ * errno value.
  *
  * Example:
  *
@@ -433,92 +1073,139 @@ int of_property_write_u32_array(struct device_node *np,
  * }
  *
  * To get a device_node of the `node2' node you may call this:
- * of_parse_phandles_with_args(node3, "list", "#list-cells", 2, &node2, &args);
+ * of_parse_phandle_with_args(node3, "list", "#list-cells", 1, &args);
  */
-int of_parse_phandles_with_args(struct device_node *np, const char *list_name,
-				const char *cells_name, int index,
-				struct device_node **out_node,
-				const void **out_args)
-{
-	int ret = -EINVAL;
-	const __be32 *list;
-	const __be32 *list_end;
-	int size;
-	int cur_index = 0;
+static int __of_parse_phandle_with_args(const struct device_node *np,
+					const char *list_name,
+					const char *cells_name, int index,
+					struct of_phandle_args *out_args)
+{
+	const __be32 *list, *list_end;
+	int rc = 0, size, cur_index = 0;
+	uint32_t count = 0;
 	struct device_node *node = NULL;
-	const void *args = NULL;
+	phandle phandle;
 
+	/* Retrieve the phandle list property */
 	list = of_get_property(np, list_name, &size);
-	if (!list) {
-		ret = -ENOENT;
-		goto err0;
-	}
+	if (!list)
+		return -ENOENT;
 	list_end = list + size / sizeof(*list);
 
+	/* Loop over the phandles until all the requested entry is found */
 	while (list < list_end) {
-		const __be32 *cells;
-		phandle phandle;
+		rc = -EINVAL;
+		count = 0;
 
+		/*
+		 * If phandle is 0, then it is an empty entry with no
+		 * arguments.  Skip forward to the next entry.
+		 */
 		phandle = be32_to_cpup(list++);
-		args = list;
-
-		/* one cell hole in the list = <>; */
-		if (!phandle)
-			goto next;
-
-		node = of_find_node_by_phandle(phandle);
-		if (!node) {
-			pr_debug("%s: could not find phandle %d\n",
-				 np->full_name, phandle);
-			goto err0;
+		if (phandle) {
+			/*
+			 * Find the provider node and parse the #*-cells
+			 * property to determine the argument length
+			 */
+			node = of_find_node_by_phandle(phandle);
+			if (!node) {
+				pr_err("%s: could not find phandle\n",
+					 np->full_name);
+				goto err;
+			}
+			if (of_property_read_u32(node, cells_name, &count)) {
+				pr_err("%s: could not get %s for %s\n",
+					 np->full_name, cells_name,
+					 node->full_name);
+				goto err;
+			}
+
+			/*
+			 * Make sure that the arguments actually fit in the
+			 * remaining property data length
+			 */
+			if (list + count > list_end) {
+				pr_err("%s: arguments longer than property\n",
+					 np->full_name);
+				goto err;
+			}
 		}
 
-		cells = of_get_property(node, cells_name, &size);
-		if (!cells || size != sizeof(*cells)) {
-			pr_debug("%s: could not get %s for %s\n",
-				 np->full_name, cells_name, node->full_name);
-			goto err1;
+		/*
+		 * All of the error cases above bail out of the loop, so at
+		 * this point, the parsing is successful. If the requested
+		 * index matches, then fill the out_args structure and return,
+		 * or return -ENOENT for an empty entry.
+		 */
+		rc = -ENOENT;
+		if (cur_index == index) {
+			if (!phandle)
+				goto err;
+
+			if (out_args) {
+				int i;
+				if (WARN_ON(count > MAX_PHANDLE_ARGS))
+					count = MAX_PHANDLE_ARGS;
+				out_args->np = node;
+				out_args->args_count = count;
+				for (i = 0; i < count; i++)
+					out_args->args[i] =
+						be32_to_cpup(list++);
+			}
+
+			/* Found it! return success */
+			return 0;
 		}
 
-		list += be32_to_cpup(cells);
-		if (list > list_end) {
-			pr_debug("%s: insufficient arguments length\n",
-				 np->full_name);
-			goto err1;
-		}
-next:
-		if (cur_index == index)
-			break;
-
 		node = NULL;
-		args = NULL;
+		list += count;
 		cur_index++;
 	}
 
-	if (!node) {
-		/*
-		 * args w/o node indicates that the loop above has stopped at
-		 * the 'hole' cell. Report this differently.
-		 */
-		if (args)
-			ret = -EEXIST;
-		else
-			ret = -ENOENT;
-		goto err0;
-	}
+	/*
+	 * Unlock node before returning result; will be one of:
+	 * -ENOENT : index is for empty phandle
+	 * -EINVAL : parsing error on data
+	 * [1..n]  : Number of phandle (count mode; when index = -1)
+	 */
+	rc = index < 0 ? cur_index : -ENOENT;
+ err:
+	return rc;
+}
 
-	if (out_node)
-		*out_node = node;
-	if (out_args)
-		*out_args = args;
+int of_parse_phandle_with_args(const struct device_node *np,
+		const char *list_name, const char *cells_name, int index,
+		struct of_phandle_args *out_args)
+{
+	if (index < 0)
+		return -EINVAL;
+	return __of_parse_phandle_with_args(np, list_name, cells_name,
+					index, out_args);
+}
+EXPORT_SYMBOL(of_parse_phandle_with_args);
 
-	return 0;
-err1:
-err0:
-	pr_debug("%s failed with status %d\n", __func__, ret);
-	return ret;
+/**
+ * of_count_phandle_with_args() - Find the number of phandles references in a property
+ * @np:		pointer to a device tree node containing a list
+ * @list_name:	property name that contains a list
+ * @cells_name:	property name that specifies phandles' arguments count
+ *
+ * Returns the number of phandle + argument tuples within a property. It
+ * is a typical pattern to encode a list of phandle and variable
+ * arguments into a single property. The number of arguments is encoded
+ * by a property in the phandle-target node. For example, a gpios
+ * property would contain a list of GPIO specifies consisting of a
+ * phandle and 1 or more arguments. The number of arguments are
+ * determined by the #gpio-cells property in the node pointed to by the
+ * phandle.
+ */
+int of_count_phandle_with_args(const struct device_node *np,
+			const char *list_name, const char *cells_name)
+{
+	return __of_parse_phandle_with_args(np, list_name, cells_name,
+					-1, NULL);
 }
-EXPORT_SYMBOL(of_parse_phandles_with_args);
+EXPORT_SYMBOL(of_count_phandle_with_args);
 
 /**
  * of_machine_is_compatible - Test root of device tree for a given compatible value
@@ -537,19 +1224,18 @@ int of_machine_is_compatible(const char *compat)
 EXPORT_SYMBOL(of_machine_is_compatible);
 
 /**
- *	of_find_node_by_path - Find a node matching a full OF path
- *	@root:	The root node of this tree
+ *	of_find_node_by_path_from - Find a node matching a full OF path
+ *      relative to a given root node.
  *	@path:	The full path to match
  *
- *	Returns a node pointer with refcount incremented, use
- *	of_node_put() on it when done.
+ *	Returns a pointer to the node found or NULL.
  */
-struct device_node *of_find_node_by_path(struct device_node *root, const char *path)
+struct device_node *of_find_node_by_path_from(struct device_node *from,
+					const char *path)
 {
 	char *slash, *p, *freep;
-	struct device_node *dn = root;
 
-	if (*path != '/')
+	if (!from || !path || *path != '/')
 		return NULL;
 
 	path++;
@@ -564,8 +1250,8 @@ struct device_node *of_find_node_by_path(struct device_node *root, const char *p
 		if (slash)
 			*slash = 0;
 
-		dn = of_find_child_by_name(dn, p);
-		if (!dn)
+		from = of_get_child_by_name(from, p);
+		if (!from)
 			goto out;
 
 		if (!slash)
@@ -576,85 +1262,21 @@ struct device_node *of_find_node_by_path(struct device_node *root, const char *p
 out:
 	free(freep);
 
-	return dn;
-}
-EXPORT_SYMBOL(of_find_node_by_path);
-
-/**
- * of_property_read_string - Find and read a string from a property
- * @np:		device node from which the property value is to be read.
- * @propname:	name of the property to be searched.
- * @out_string:	pointer to null terminated return string, modified only if
- *		return value is 0.
- *
- * Search for a property in a device tree node and retrieve a null
- * terminated string value (pointer to data, not a copy). Returns 0 on
- * success, -EINVAL if the property does not exist, -ENODATA if property
- * does not have a value, and -EILSEQ if the string is not null-terminated
- * within the length of the property data.
- *
- * The out_string pointer is modified only if a valid string can be decoded.
- */
-int of_property_read_string(struct device_node *np, const char *propname,
-				const char **out_string)
-{
-	struct property *prop = of_find_property(np, propname);
-	if (!prop)
-		return -EINVAL;
-	if (!prop->value)
-		return -ENODATA;
-	if (strnlen(prop->value, prop->length) >= prop->length)
-		return -EILSEQ;
-	*out_string = prop->value;
-	return 0;
+	return from;
 }
-EXPORT_SYMBOL_GPL(of_property_read_string);
+EXPORT_SYMBOL(of_find_node_by_path_from);
 
 /**
- * of_property_read_string_index - Find and read a string from a multiple
- * strings property.
- * @np:		device node from which the property value is to be read.
- * @propname:	name of the property to be searched.
- * @index:	index of the string in the list of strings
- * @out_string:	pointer to null terminated return string, modified only if
- *		return value is 0.
- *
- * Search for a property in a device tree node and retrieve a null
- * terminated string value (pointer to data, not a copy) in the list of strings
- * contained in that property.
- * Returns 0 on success, -EINVAL if the property does not exist, -ENODATA if
- * property does not have a value, and -EILSEQ if the string is not
- * null-terminated within the length of the property data.
+ *	of_find_node_by_path - Find a node matching a full OF path
+ *	@path:	The full path to match
  *
- * The out_string pointer is modified only if a valid string can be decoded.
+ *	Returns a pointer to the node found or NULL.
  */
-int of_property_read_string_index(struct device_node *np, const char *propname,
-				  int index, const char **output)
+struct device_node *of_find_node_by_path(const char *path)
 {
-	struct property *prop = of_find_property(np, propname);
-	int i = 0;
-	size_t l = 0, total = 0;
-	const char *p;
-
-	if (!prop)
-		return -EINVAL;
-	if (!prop->value)
-		return -ENODATA;
-	if (strnlen(prop->value, prop->length) >= prop->length)
-		return -EILSEQ;
-
-	p = prop->value;
-
-	for (i = 0; total < prop->length; total += l, p += l) {
-		l = strlen(p) + 1;
-		if (i++ == index) {
-			*output = p;
-			return 0;
-		}
-	}
-	return -ENODATA;
+	return of_find_node_by_path_from(root_node, path);
 }
-EXPORT_SYMBOL_GPL(of_property_read_string_index);
+EXPORT_SYMBOL(of_find_node_by_path);
 
 /**
  * of_modalias_node - Lookup appropriate modalias for a device node
@@ -700,17 +1322,128 @@ int of_set_root_node(struct device_node *node)
 	return 0;
 }
 
-static int of_node_disabled(struct device_node *node)
+/**
+ *  of_device_is_available - check if a device is available for use
+ *
+ *  @device: Node to check for availability
+ *
+ *  Returns 1 if the status property is absent or set to "okay" or "ok",
+ *  0 otherwise
+ */
+int of_device_is_available(const struct device_node *device)
 {
-	struct property *p;
+	const char *status;
+	int statlen;
+
+	status = of_get_property(device, "status", &statlen);
+	if (status == NULL)
+		return 1;
 
-	p = of_find_property(node, "status");
-	if (p) {
-		if (!strcmp("disabled", p->value))
+	if (statlen > 0) {
+		if (!strcmp(status, "okay") || !strcmp(status, "ok"))
 			return 1;
 	}
+
 	return 0;
 }
+EXPORT_SYMBOL(of_device_is_available);
+
+/**
+ *	of_get_parent - Get a node's parent if any
+ *	@node:	Node to get parent
+ *
+ *	Returns a pointer to the parent node or NULL if already at root.
+ */
+struct device_node *of_get_parent(const struct device_node *node)
+{
+	return (!node) ? NULL : node->parent;
+}
+EXPORT_SYMBOL(of_get_parent);
+
+/**
+ *	of_get_next_available_child - Find the next available child node
+ *	@node:	parent node
+ *	@prev:	previous child of the parent node, or NULL to get first
+ *
+ *      This function is like of_get_next_child(), except that it
+ *      automatically skips any disabled nodes (i.e. status = "disabled").
+ */
+struct device_node *of_get_next_available_child(const struct device_node *node,
+	struct device_node *prev)
+{
+	for_each_child_of_node(node, prev)
+		if (of_device_is_available(prev))
+			return prev;
+	return NULL;
+}
+EXPORT_SYMBOL(of_get_next_available_child);
+
+/**
+ *	of_get_child_count - Count child nodes of given parent node
+ *	@parent:	parent node
+ *
+ *      Returns the number of child nodes or -EINVAL on NULL parent node.
+ */
+int of_get_child_count(const struct device_node *parent)
+{
+	struct device_node *child;
+	int num = 0;
+
+	if (!parent)
+		return -EINVAL;
+
+	for_each_child_of_node(parent, child)
+		num++;
+
+	return num;
+}
+EXPORT_SYMBOL(of_get_child_count);
+
+/**
+ *	of_get_available_child_count - Count available child nodes of given
+ *      parent node
+ *	@parent:	parent node
+ *
+ *      Returns the number of available child nodes or -EINVAL on NULL parent
+ *      node.
+ */
+int of_get_available_child_count(const struct device_node *parent)
+{
+	struct device_node *child;
+	int num = 0;
+
+	if (!parent)
+		return -EINVAL;
+
+	for_each_child_of_node(parent, child)
+		if (of_device_is_available(child))
+			num++;
+
+	return num;
+}
+EXPORT_SYMBOL(of_get_available_child_count);
+
+/**
+ *	of_get_child_by_name - Find the child node by name for a given parent
+ *	@node:	parent node
+ *	@name:	child name to look for.
+ *
+ *      This function looks for child node for given matching name
+ *
+ *	Returns a node pointer if found or NULL.
+ */
+struct device_node *of_get_child_by_name(const struct device_node *node,
+				const char *name)
+{
+	struct device_node *child;
+
+	for_each_child_of_node(node, child)
+		if (child->name && (of_node_cmp(child->name, name) == 0))
+			return child;
+
+	return NULL;
+}
+EXPORT_SYMBOL(of_get_child_by_name);
 
 void of_print_nodes(struct device_node *node, int indent)
 {
@@ -774,13 +1507,17 @@ struct property *of_new_property(struct device_node *node, const char *name,
 	struct property *prop;
 
 	prop = xzalloc(sizeof(*prop));
-
 	prop->name = strdup(name);
+	if (!prop->name) {
+		free(prop);
+		return NULL;
+	}
+
 	prop->length = len;
-	if (len) {
-		prop->value = xzalloc(len);
+	prop->value = xzalloc(len);
+
+	if (data)
 		memcpy(prop->value, data, len);
-	}
 
 	list_add_tail(&prop->list, &node->properties);
 
@@ -789,6 +1526,9 @@ struct property *of_new_property(struct device_node *node, const char *name,
 
 void of_delete_property(struct property *pp)
 {
+	if (!pp)
+		return;
+
 	list_del(&pp->list);
 
 	free(pp->name);
@@ -807,26 +1547,19 @@ void of_delete_property(struct property *pp)
 int of_set_property(struct device_node *np, const char *name, const void *val, int len,
 		int create)
 {
-	struct property *pp;
+	struct property *pp = of_find_property(np, name, NULL);
 
 	if (!np)
 		return -ENOENT;
 
-	pp = of_find_property(np, name);
-	if (pp) {
-		void *data;
+	if (!pp && !create)
+		return -ENOENT;
 
-		free(pp->value);
-		data = xzalloc(len);
-		memcpy(data, val, len);
-		pp->value = data;
-		pp->length = len;
-	} else {
-		if (!create)
-			return -ENOENT;
+	of_delete_property(pp);
 
-		pp = of_new_property(np, name, val, len);
-	}
+	pp = of_new_property(np, name, val, len);
+	if (!pp)
+		return -ENOMEM;
 
 	return 0;
 }
@@ -904,7 +1637,7 @@ static struct device_d *add_of_device(struct device_node *node,
 {
 	const struct property *cp;
 
-	if (of_node_disabled(node))
+	if (!of_device_is_available(node))
 		return NULL;
 
 	cp = of_get_property(node, "compatible", NULL);
@@ -938,7 +1671,7 @@ int of_add_memory(struct device_node *node, bool dump)
 	if (ret)
 		return -ENXIO;
 
-	if (strcmp(device_type, "memory"))
+	if (of_node_cmp(device_type, "memory"))
 		return -ENXIO;
 
 	of_bus_count_cells(node, &na, &nc);
@@ -1050,12 +1783,8 @@ void of_free(struct device_node *node)
 	if (!node)
 		return;
 
-	list_for_each_entry_safe(p, pt, &node->properties, list) {
-		list_del(&p->list);
-		free(p->name);
-		free(p->value);
-		free(p);
-	}
+	list_for_each_entry_safe(p, pt, &node->properties, list)
+		of_delete_property(p);
 
 	list_for_each_entry_safe(n, nt, &node->children, parent_list) {
 		of_free(n);
@@ -1137,12 +1866,12 @@ int of_probe(void)
 	if(!root_node)
 		return -ENODEV;
 
-	of_chosen = of_find_node_by_path(root_node, "/chosen");
+	of_chosen = of_find_node_by_path("/chosen");
 	of_property_read_string(root_node, "model", &of_model);
 
 	__of_parse_phandles(root_node);
 
-	memory = of_find_node_by_path(root_node, "/memory");
+	memory = of_find_node_by_path("/memory");
 	if (memory)
 		of_add_memory(memory, false);
 
@@ -1152,17 +1881,6 @@ int of_probe(void)
 	return 0;
 }
 
-struct device_node *of_find_child_by_name(struct device_node *node, const char *name)
-{
-	struct device_node *_n;
-
-	device_node_for_nach_child(node, _n)
-		if (!strcmp(_n->name, name))
-			return _n;
-
-	return NULL;
-}
-
 /**
  * of_create_node - create a new node including its parents
  * @path - the nodepath to create
@@ -1187,7 +1905,7 @@ struct device_node *of_create_node(struct device_node *root, const char *path)
 		if (slash)
 			*slash = 0;
 
-		tmp = of_find_child_by_name(dn, p);
+		tmp = of_get_child_by_name(dn, p);
 		if (tmp)
 			dn = tmp;
 		else
@@ -1215,8 +1933,8 @@ int of_device_is_stdout_path(struct device_d *dev)
 	name = of_get_property(of_chosen, "linux,stdout-path", NULL);
 	if (name == NULL)
 		return 0;
-	dn = of_find_node_by_path(root_node, name);
 
+	dn = of_find_node_by_path(name);
 	if (!dn)
 		return 0;
 
@@ -1245,7 +1963,7 @@ int of_add_initrd(struct device_node *root, resource_size_t start,
 	struct device_node *chosen;
 	__be32 buf[2];
 
-	chosen = of_find_node_by_path(root, "/chosen");
+	chosen = of_find_node_by_path("/chosen");
 	if (!chosen)
 		return -EINVAL;
 
@@ -1257,11 +1975,11 @@ int of_add_initrd(struct device_node *root, resource_size_t start,
 	} else {
 		struct property *pp;
 
-		pp = of_find_property(chosen, "linux,initrd-start");
+		pp = of_find_property(chosen, "linux,initrd-start", NULL);
 		if (pp)
 			of_delete_property(pp);
 
-		pp = of_find_property(chosen, "linux,initrd-end");
+		pp = of_find_property(chosen, "linux,initrd-end", NULL);
 		if (pp)
 			of_delete_property(pp);
 	}
diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index a3ec576d55..afaa4e0f51 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -61,7 +61,7 @@ struct device_node *of_unflatten_dtb(struct device_node *root, void *infdt)
 	int  len;		/* length of the property */
 	const struct fdt_property *fdt_prop;
 	const char *pathp, *name;
-	struct device_node *node = NULL, *n;
+	struct device_node *node = NULL;
 	struct property *p;
 	uint32_t dt_struct;
 	struct fdt_node_header *fnh;
@@ -135,9 +135,10 @@ struct device_node *of_unflatten_dtb(struct device_node *root, void *infdt)
 			if (!node) {
 				node = root;
 			} else {
-				if (merge && (n = of_find_child_by_name(node, pathp)))
-					node = n;
-				else
+				if (merge)
+					node = of_get_child_by_name(node,
+								    pathp);
+				if (!merge || !node)
 					node = of_new_node(node, pathp);
 			}
 
@@ -178,7 +179,10 @@ struct device_node *of_unflatten_dtb(struct device_node *root, void *infdt)
 				goto err;
 			}
 
-			if (merge && (p = of_find_property(node, name))) {
+			p = NULL;
+			if (merge)
+				p = of_find_property(node, name, NULL);
+			if (merge && p) {
 				free(p->value);
 				p->value = xzalloc(len);
 				memcpy(p->value, nodep, len);
diff --git a/drivers/of/gpio.c b/drivers/of/gpio.c
index 83b72c03f3..41e91ec29a 100644
--- a/drivers/of/gpio.c
+++ b/drivers/of/gpio.c
@@ -9,17 +9,16 @@ int of_get_named_gpio(struct device_node *np,
                                    const char *propname, int index)
 {
 	int ret;
-	struct device_node *gpio_np;
-	const void *gpio_spec;
+	struct of_phandle_args out_args;
 
-	ret = of_parse_phandles_with_args(np, propname, "#gpio-cells", index,
-					  &gpio_np, &gpio_spec);
+	ret = of_parse_phandle_with_args(np, propname, "#gpio-cells",
+					index, &out_args);
 	if (ret) {
 		pr_debug("%s: can't parse gpios property: %d\n", __func__, ret);
 		return -EINVAL;
 	}
 
-	ret = gpio_get_num(gpio_np->device, be32_to_cpup(gpio_spec));
+	ret = gpio_get_num(out_args.np->device, out_args.args[0]);
 	if (ret < 0)
 		return ret;
 
diff --git a/drivers/of/of_net.c b/drivers/of/of_net.c
index de93fbc55e..2bf05e2ba2 100644
--- a/drivers/of/of_net.c
+++ b/drivers/of/of_net.c
@@ -76,15 +76,15 @@ const void *of_get_mac_address(struct device_node *np)
 {
 	struct property *pp;
 
-	pp = of_find_property(np, "mac-address");
+	pp = of_find_property(np, "mac-address", NULL);
 	if (pp && (pp->length == 6) && is_valid_ether_addr(pp->value))
 		return pp->value;
 
-	pp = of_find_property(np, "local-mac-address");
+	pp = of_find_property(np, "local-mac-address", NULL);
 	if (pp && (pp->length == 6) && is_valid_ether_addr(pp->value))
 		return pp->value;
 
-	pp = of_find_property(np, "address");
+	pp = of_find_property(np, "address", NULL);
 	if (pp && (pp->length == 6) && is_valid_ether_addr(pp->value))
 		return pp->value;
 
diff --git a/drivers/of/partition.c b/drivers/of/partition.c
index 2d70cf5353..e4b7d1e66b 100644
--- a/drivers/of/partition.c
+++ b/drivers/of/partition.c
@@ -29,7 +29,7 @@ int of_parse_partitions(struct cdev *cdev, struct device_node *node)
 	const char *partname;
 	char *filename;
 
-	device_node_for_nach_child(node, n) {
+	for_each_child_of_node(node, n) {
 		const __be32 *reg;
 		unsigned long offset, size;
 		const char *name;
diff --git a/drivers/pinctrl/pinctrl.c b/drivers/pinctrl/pinctrl.c
index fa979a1b78..7c797d35bc 100644
--- a/drivers/pinctrl/pinctrl.c
+++ b/drivers/pinctrl/pinctrl.c
@@ -64,14 +64,14 @@ int pinctrl_select_state(struct device_d *dev, const char *name)
 	if (!np)
 		return 0;
 
-	if (!of_find_property(np, "pinctrl-0"))
+	if (!of_find_property(np, "pinctrl-0", NULL))
 		return 0;
 
 	/* For each defined state ID */
 	for (state = 0; ; state++) {
 		/* Retrieve the pinctrl-* property */
 		propname = asprintf("pinctrl-%d", state);
-		prop = of_find_property(np, propname);
+		prop = of_find_property(np, propname, NULL);
 		free(propname);
 
 		if (!prop) {
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index f460a7a690..5d4dfd6f02 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -107,22 +107,22 @@ void spi_of_register_slaves(struct spi_master *master, struct device_node *node)
 	struct spi_board_info chip;
 	struct property *reg;
 
-	device_node_for_nach_child(node, n) {
+	for_each_child_of_node(node, n) {
 		memset(&chip, 0, sizeof(chip));
 		chip.name = xstrdup(n->name);
 		chip.bus_num = master->bus_num;
 		/* Mode (clock phase/polarity/etc.) */
-		if (of_find_property(n, "spi-cpha"))
+		if (of_find_property(n, "spi-cpha", NULL))
 			chip.mode |= SPI_CPHA;
-		if (of_find_property(n, "spi-cpol"))
+		if (of_find_property(n, "spi-cpol", NULL))
 			chip.mode |= SPI_CPOL;
-		if (of_find_property(n, "spi-cs-high"))
+		if (of_find_property(n, "spi-cs-high", NULL))
 			chip.mode |= SPI_CS_HIGH;
-		if (of_find_property(n, "spi-3wire"))
+		if (of_find_property(n, "spi-3wire", NULL))
 			chip.mode |= SPI_3WIRE;
 		of_property_read_u32(n, "spi-max-frequency",
 				&chip.max_speed_hz);
-		reg = of_find_property(n, "reg");
+		reg = of_find_property(n, "reg", NULL);
 		if (!reg)
 			continue;
 		chip.chip_select = of_read_number(reg->value, 1);
diff --git a/drivers/usb/imx/chipidea-imx.c b/drivers/usb/imx/chipidea-imx.c
index 80a51b72e8..a0dab70337 100644
--- a/drivers/usb/imx/chipidea-imx.c
+++ b/drivers/usb/imx/chipidea-imx.c
@@ -76,16 +76,15 @@ static int imx_chipidea_port_post_init(void *drvdata)
 
 static int imx_chipidea_probe_dt(struct imx_chipidea *ci)
 {
-	const void *out_args;
-	struct device_node *usbmisc_np;
+	struct of_phandle_args out_args;
 	enum usb_dr_mode mode;
 	enum usb_phy_interface phymode;
 
-	of_parse_phandles_with_args(ci->dev->device_node, "fsl,usbmisc",
-			"#index-cells", 0, &usbmisc_np, &out_args);
-
-	ci->portno = be32_to_cpup(out_args);
+	if (of_parse_phandle_with_args(ci->dev->device_node, "fsl,usbmisc",
+					"#index-cells", 0, &out_args))
+		return -ENODEV;
 
+	ci->portno = out_args.args[0];
 	ci->flags = MXC_EHCI_MODE_UTMI_8BIT;
 
 	mode = of_usb_get_dr_mode(ci->dev->device_node, NULL);
@@ -122,7 +121,8 @@ static int imx_chipidea_probe_dt(struct imx_chipidea *ci)
 		return -EINVAL;
 	}
 
-	if (of_find_property(ci->dev->device_node, "disable-over-current"))
+	if (of_find_property(ci->dev->device_node,
+				"disable-over-current", NULL))
 		ci->flags |= MXC_EHCI_DISABLE_OVERCURRENT;
 
 	return 0;
diff --git a/include/linux/string.h b/include/linux/string.h
index afd0aa6033..658264cd1e 100644
--- a/include/linux/string.h
+++ b/include/linux/string.h
@@ -53,6 +53,15 @@ extern int strcmp(const char *,const char *);
 #ifndef __HAVE_ARCH_STRNCMP
 extern int strncmp(const char *,const char *,__kernel_size_t);
 #endif
+#ifndef __HAVE_ARCH_STRNICMP
+extern int strnicmp(const char *, const char *, __kernel_size_t);
+#endif
+#ifndef __HAVE_ARCH_STRCASECMP
+extern int strcasecmp(const char *s1, const char *s2);
+#endif
+#ifndef __HAVE_ARCH_STRNCASECMP
+extern int strncasecmp(const char *s1, const char *s2, size_t n);
+#endif
 #ifndef __HAVE_ARCH_STRCHR
 extern char * _strchr(const char *,int);
 #endif
diff --git a/include/of.h b/include/of.h
index 300b7069c0..b392ca9daa 100644
--- a/include/of.h
+++ b/include/of.h
@@ -5,6 +5,11 @@
 #include <errno.h>
 #include <asm/byteorder.h>
 
+/* Default string compare functions */
+#define of_compat_cmp(s1, s2, l)	strcasecmp((s1), (s2))
+#define of_prop_cmp(s1, s2)		strcmp((s1), (s2))
+#define of_node_cmp(s1, s2)		strcasecmp((s1), (s2))
+
 #define OF_BAD_ADDR      ((u64)-1)
 
 typedef u32 phandle;
@@ -37,6 +42,13 @@ struct of_device_id {
 	unsigned long data;
 };
 
+#define MAX_PHANDLE_ARGS 8
+struct of_phandle_args {
+	struct device_node *np;
+	int args_count;
+	uint32_t args[MAX_PHANDLE_ARGS];
+};
+
 #define OF_MAX_RESERVE_MAP	16
 struct of_reserve_map {
 	uint64_t start[OF_MAX_RESERVE_MAP];
@@ -59,32 +71,10 @@ int of_match(struct device_d *dev, struct driver_d *drv);
 int of_add_initrd(struct device_node *root, resource_size_t start,
 		resource_size_t end);
 
-int of_n_addr_cells(struct device_node *np);
-int of_n_size_cells(struct device_node *np);
-
-struct property *of_find_property(const struct device_node *node, const char *name);
-
-struct device_node *of_find_node_by_path(struct device_node *root, const char *path);
-
-struct device_node *of_find_child_by_name(struct device_node *node, const char *name);
-
 struct fdt_header *fdt_get_tree(void);
 
 struct fdt_header *of_get_fixed_tree(struct device_node *node);
 
-int of_modalias_node(struct device_node *node, char *modalias, int len);
-
-#define device_node_for_nach_child(node, child) \
-	list_for_each_entry(child, &node->children, parent_list)
-
-/*
- * Iterate over all nodes of a tree. As a devicetree does not
- * have a dedicated list head, the start node (usually the root
- * node) will not be iterated over.
- */
-#define of_tree_for_each_node(node, root) \
-	list_for_each_entry(node, &root->list, list)
-
 /* Helper to read a big number; size is in cells (not bytes) */
 static inline u64 of_read_number(const __be32 *cell, int size)
 {
@@ -105,48 +95,12 @@ static inline void of_write_number(void *__cell, u64 val, int size)
 	}
 }
 
-int of_property_read_u32_array(const struct device_node *np,
-			       const char *propname, u32 *out_values,
-			       size_t sz);
-
-static inline int of_property_read_u32(const struct device_node *np,
-				       const char *propname,
-				       u32 *out_value)
-{
-	return of_property_read_u32_array(np, propname, out_value, 1);
-}
-
-int of_property_write_u32_array(struct device_node *np,
-				const char *propname, const u32 *values,
-				size_t sz);
-
-static inline int of_property_write_u32(struct device_node *np,
-					const char *propname,
-					u32 value)
-{
-	return of_property_write_u32_array(np, propname, &value, 1);
-}
-
-const void *of_get_property(const struct device_node *np, const char *name,
-			 int *lenp);
-
-int of_parse_phandles_with_args(struct device_node *np, const char *list_name,
-				const char *cells_name, int index,
-				struct device_node **out_node,
-				const void **out_args);
-
 int of_get_named_gpio(struct device_node *np,
                                    const char *propname, int index);
 
-struct device_node *of_find_node_by_phandle(phandle phandle);
 void of_print_property(const void *data, int len);
 void of_print_cmdline(struct device_node *root);
 
-int of_device_is_compatible(const struct device_node *device,
-		const char *compat);
-
-int of_machine_is_compatible(const char *compat);
-
 u64 of_translate_address(struct device_node *node, const __be32 *in_addr);
 
 #define OF_ROOT_NODE_SIZE_CELLS_DEFAULT 1
@@ -155,40 +109,130 @@ u64 of_translate_address(struct device_node *node, const __be32 *in_addr);
 void of_print_nodes(struct device_node *node, int indent);
 int of_probe(void);
 int of_parse_dtb(struct fdt_header *fdt);
-void of_free(struct device_node *node);
 struct device_node *of_unflatten_dtb(struct device_node *root, void *fdt);
-struct device_node *of_new_node(struct device_node *parent, const char *name);
-struct property *of_new_property(struct device_node *node, const char *name,
-		const void *data, int len);
-void of_delete_property(struct property *pp);
 
-int of_property_read_string(struct device_node *np, const char *propname,
-				const char **out_string);
-int of_property_read_string_index(struct device_node *np, const char *propname,
-				  int index, const char **output);
-int of_set_property(struct device_node *node, const char *p, const void *val, int len,
-		int create);
-struct device_node *of_create_node(struct device_node *root, const char *path);
+struct cdev;
 
-int of_set_root_node(struct device_node *);
+#ifdef CONFIG_OFTREE
+extern int of_n_addr_cells(struct device_node *np);
+extern int of_n_size_cells(struct device_node *np);
+
+extern struct property *of_find_property(const struct device_node *np,
+					const char *name, int *lenp);
+extern const void *of_get_property(const struct device_node *np,
+				const char *name, int *lenp);
+
+extern int of_set_property(struct device_node *node, const char *p,
+			const void *val, int len, int create);
+extern struct property *of_new_property(struct device_node *node,
+				const char *name, const void *data, int len);
+extern void of_delete_property(struct property *pp);
+
+extern struct device_node *of_find_node_by_name(struct device_node *from,
+	const char *name);
+extern struct device_node *of_find_node_by_path_from(struct device_node *from,
+						const char *path);
+extern struct device_node *of_find_node_by_path(const char *path);
+extern struct device_node *of_find_node_by_phandle(phandle phandle);
+extern struct device_node *of_find_compatible_node(struct device_node *from,
+	const char *type, const char *compat);
+extern const struct of_device_id *of_match_node(
+	const struct of_device_id *matches, const struct device_node *node);
+extern struct device_node *of_find_matching_node_and_match(
+	struct device_node *from,
+	const struct of_device_id *matches,
+	const struct of_device_id **match);
+extern struct device_node *of_find_node_with_property(
+	struct device_node *from, const char *prop_name);
+
+extern struct device_node *of_new_node(struct device_node *parent,
+				const char *name);
+extern struct device_node *of_create_node(struct device_node *root,
+					const char *path);
+extern void of_free(struct device_node *node);
+
+extern int of_machine_is_compatible(const char *compat);
+extern int of_device_is_compatible(const struct device_node *device,
+		const char *compat);
+extern int of_device_is_available(const struct device_node *device);
 
-const struct of_device_id *of_match_node(const struct of_device_id *matches,
-					 const struct device_node *node);
+extern struct device_node *of_get_parent(const struct device_node *node);
+extern struct device_node *of_get_next_available_child(
+	const struct device_node *node, struct device_node *prev);
+extern int of_get_child_count(const struct device_node *parent);
+extern int of_get_available_child_count(const struct device_node *parent);
+extern struct device_node *of_get_child_by_name(const struct device_node *node,
+					const char *name);
 
-struct cdev;
+extern int of_property_read_u32_index(const struct device_node *np,
+				       const char *propname,
+				       u32 index, u32 *out_value);
+extern int of_property_read_u8_array(const struct device_node *np,
+			const char *propname, u8 *out_values, size_t sz);
+extern int of_property_read_u16_array(const struct device_node *np,
+			const char *propname, u16 *out_values, size_t sz);
+extern int of_property_read_u32_array(const struct device_node *np,
+				      const char *propname,
+				      u32 *out_values,
+				      size_t sz);
+extern int of_property_read_u64(const struct device_node *np,
+				const char *propname, u64 *out_value);
+
+extern int of_property_read_string(struct device_node *np,
+				   const char *propname,
+				   const char **out_string);
+extern int of_property_read_string_index(struct device_node *np,
+					 const char *propname,
+					 int index, const char **output);
+extern int of_property_match_string(struct device_node *np,
+				    const char *propname,
+				    const char *string);
+extern int of_property_count_strings(struct device_node *np,
+				     const char *propname);
+
+extern const __be32 *of_prop_next_u32(struct property *prop,
+				const __be32 *cur, u32 *pu);
+extern const char *of_prop_next_string(struct property *prop, const char *cur);
+
+extern int of_property_write_bool(struct device_node *np,
+				const char *propname, const bool value);
+extern int of_property_write_u8_array(struct device_node *np,
+				const char *propname, const u8 *values,
+				size_t sz);
+extern int of_property_write_u16_array(struct device_node *np,
+				const char *propname, const u16 *values,
+				size_t sz);
+extern int of_property_write_u32_array(struct device_node *np,
+				const char *propname, const u32 *values,
+				size_t sz);
+extern int of_property_write_u64_array(struct device_node *np,
+				const char *propname, const u64 *values,
+				size_t sz);
 
-#ifdef CONFIG_OFTREE
-int of_parse_partitions(struct cdev *cdev, struct device_node *node);
+extern struct device_node *of_parse_phandle(const struct device_node *np,
+					    const char *phandle_name,
+					    int index);
+extern int of_parse_phandle_with_args(const struct device_node *np,
+	const char *list_name, const char *cells_name, int index,
+	struct of_phandle_args *out_args);
+extern int of_count_phandle_with_args(const struct device_node *np,
+	const char *list_name, const char *cells_name);
+
+extern void of_alias_scan(void);
+extern int of_alias_get_id(struct device_node *np, const char *stem);
+extern const char *of_alias_get(struct device_node *np);
+extern int of_modalias_node(struct device_node *node, char *modalias, int len);
+
+extern struct device_node *of_get_root_node(void);
+extern int of_set_root_node(struct device_node *node);
 
-int of_alias_get_id(struct device_node *np, const char *stem);
-const char *of_alias_get(struct device_node *np);
+int of_parse_partitions(struct cdev *cdev, struct device_node *node);
 int of_device_is_stdout_path(struct device_d *dev);
 const char *of_get_model(void);
 void *of_flatten_dtb(struct device_node *node);
 int of_add_memory(struct device_node *node, bool dump);
 void of_add_memory_bank(struct device_node *node, bool dump, int r,
 		u64 base, u64 size);
-struct device_node *of_get_root_node(void);
 #else
 static inline int of_parse_partitions(struct cdev *cdev,
 					  struct device_node *node)
@@ -196,40 +240,436 @@ static inline int of_parse_partitions(struct cdev *cdev,
 	return -EINVAL;
 }
 
-static inline int of_alias_get_id(struct device_node *np, const char *stem)
+static inline int of_device_is_stdout_path(struct device_d *dev)
 {
-	return -ENOENT;
+	return 0;
 }
 
-static inline const char *of_alias_get(struct device_node *np)
+static inline const char *of_get_model(void)
 {
 	return NULL;
 }
 
-static inline int of_device_is_stdout_path(struct device_d *dev)
+static inline void *of_flatten_dtb(struct device_node *node)
+{
+	return NULL;
+}
+
+static inline int of_add_memory(struct device_node *node, bool dump)
+{
+	return -EINVAL;
+}
+
+static inline struct device_node *of_get_root_node(void)
+{
+	return NULL;
+}
+
+static inline int of_set_root_node(struct device_node *node)
+{
+	return -ENOSYS;
+}
+
+static inline int of_n_addr_cells(struct device_node *np)
 {
 	return 0;
 }
 
-static inline const char *of_get_model(void)
+static inline int of_n_size_cells(struct device_node *np)
+{
+	return 0;
+}
+
+static inline struct device_node *of_get_parent(const struct device_node *node)
 {
 	return NULL;
 }
 
-static inline void *of_flatten_dtb(struct device_node *node)
+static inline struct device_node *of_get_next_available_child(
+		const struct device_node *node, struct device_node *prev)
 {
 	return NULL;
 }
 
-static inline int of_add_memory(struct device_node *node, bool dump)
+static inline int of_get_child_count(const struct device_node *parent)
 {
-	return -EINVAL;
+	return -ENOSYS;
 }
 
-static inline struct device_node *of_get_root_node(void)
+static inline int of_get_available_child_count(const struct device_node *parent)
+{
+	return -ENOSYS;
+}
+
+static inline struct device_node *of_get_child_by_name(
+			const struct device_node *node, const char *name)
+{
+	return NULL;
+}
+
+static inline struct property *of_find_property(const struct device_node *np,
+						const char *name,
+						int *lenp)
+{
+	return NULL;
+}
+
+static inline const void *of_get_property(const struct device_node *np,
+				const char *name, int *lenp)
+{
+	return NULL;
+}
+
+static inline int of_set_property(struct device_node *node, const char *p,
+			const void *val, int len, int create)
+{
+	return -ENOSYS;
+}
+
+static inline struct property *of_new_property(struct device_node *node,
+				const char *name, const void *data, int len)
+{
+	return NULL;
+}
+
+static inline void of_delete_property(struct property *pp)
+{
+}
+
+static inline int of_property_read_u32_index(const struct device_node *np,
+				const char *propname, u32 index, u32 *out_value)
+{
+	return -ENOSYS;
+}
+
+static inline int of_property_read_u8_array(const struct device_node *np,
+				const char *propname, u8 *out_values, size_t sz)
+{
+	return -ENOSYS;
+}
+
+static inline int of_property_read_u16_array(const struct device_node *np,
+			const char *propname, u16 *out_values, size_t sz)
+{
+	return -ENOSYS;
+}
+
+static inline int of_property_read_u32_array(const struct device_node *np,
+			const char *propname, u32 *out_values, size_t sz)
+{
+	return -ENOSYS;
+}
+
+static inline int of_property_read_u64(const struct device_node *np,
+				const char *propname, u64 *out_value)
+{
+	return -ENOSYS;
+}
+
+static inline int of_property_read_string(struct device_node *np,
+				const char *propname, const char **out_string)
+{
+	return -ENOSYS;
+}
+
+static inline int of_property_read_string_index(struct device_node *np,
+			 const char *propname, int index, const char **output)
+{
+	return -ENOSYS;
+}
+
+static inline int of_property_match_string(struct device_node *np,
+				const char *propname, const char *string)
+{
+	return -ENOSYS;
+}
+
+static inline int of_property_count_strings(struct device_node *np,
+					const char *propname)
+{
+	return -ENOSYS;
+}
+
+static inline const __be32 *of_prop_next_u32(struct property *prop,
+					const __be32 *cur, u32 *pu)
+{
+	return 0;
+}
+
+static inline const char *of_prop_next_string(struct property *prop,
+					const char *cur)
 {
 	return NULL;
 }
+
+static inline int of_property_write_bool(struct device_node *np,
+				const char *propname, const bool value)
+{
+	return -ENOSYS;
+}
+
+static inline int of_property_write_u8_array(struct device_node *np,
+			const char *propname, const u8 *values, size_t sz)
+{
+	return -ENOSYS;
+}
+
+static inline int of_property_write_u16_array(struct device_node *np,
+			const char *propname, const u16 *values, size_t sz)
+{
+	return -ENOSYS;
+}
+
+static inline int of_property_write_u32_array(struct device_node *np,
+			const char *propname, const u32 *values, size_t sz)
+{
+	return -ENOSYS;
+}
+
+static inline int of_property_write_u64_array(struct device_node *np,
+			const char *propname, const u64 *values, size_t sz)
+{
+	return -ENOSYS;
+}
+
+static inline struct device_node *of_parse_phandle(const struct device_node *np,
+					    const char *phandle_name, int index)
+{
+	return NULL;
+}
+
+static inline int of_parse_phandle_with_args(const struct device_node *np,
+		const char *list_name, const char *cells_name, int index,
+		struct of_phandle_args *out_args)
+{
+	return -ENOSYS;
+}
+
+static inline int of_count_phandle_with_args(const struct device_node *np,
+				const char *list_name, const char *cells_name)
+{
+	return -ENOSYS;
+}
+
+static inline struct device_node *of_find_node_by_path_from(
+	struct device_node *from, const char *path)
+{
+	return NULL;
+}
+
+static inline struct device_node *of_find_node_by_path(const char *path)
+{
+	return NULL;
+}
+
+static inline struct device_node *of_find_node_by_name(struct device_node *from,
+	const char *name)
+{
+	return NULL;
+}
+
+static inline struct device_node *of_find_node_by_phandle(phandle phandle)
+{
+	return NULL;
+}
+
+static inline struct device_node *of_find_compatible_node(
+						struct device_node *from,
+						const char *type,
+						const char *compat)
+{
+	return NULL;
+}
+
+static inline const struct of_device_id *of_match_node(
+	const struct of_device_id *matches, const struct device_node *node)
+{
+	return NULL;
+}
+
+static inline struct device_node *of_find_matching_node_and_match(
+					struct device_node *from,
+					const struct of_device_id *matches,
+					const struct of_device_id **match)
+{
+	return NULL;
+}
+
+static inline struct device_node *of_find_node_with_property(
+			struct device_node *from, const char *prop_name)
+{
+	return NULL;
+}
+
+static inline struct device_node *of_new_node(struct device_node *parent,
+				const char *name)
+{
+	return NULL;
+}
+
+static inline struct device_node *of_create_node(struct device_node *root,
+					const char *path)
+{
+	return NULL;
+}
+
+static inline void of_free(struct device_node *node)
+{
+}
+
+static inline int of_machine_is_compatible(const char *compat)
+{
+	return 0;
+}
+
+static inline int of_device_is_compatible(const struct device_node *device,
+		const char *compat)
+{
+	return 0;
+}
+
+static inline int of_device_is_available(const struct device_node *device)
+{
+	return 0;
+}
+
+static inline void of_alias_scan(void)
+{
+}
+
+static inline int of_alias_get_id(struct device_node *np, const char *stem)
+{
+	return -ENOSYS;
+}
+
+static inline const char *of_alias_get(struct device_node *np)
+{
+	return NULL;
+}
+
+static inline int of_modalias_node(struct device_node *node, char *modalias,
+				int len)
+{
+	return -ENOSYS;
+}
 #endif
 
+#define for_each_node_by_name(dn, name) \
+	for (dn = of_find_node_by_name(NULL, name); dn; \
+	     dn = of_find_node_by_name(dn, name))
+#define for_each_compatible_node(dn, type, compatible) \
+	for (dn = of_find_compatible_node(NULL, type, compatible); dn; \
+	     dn = of_find_compatible_node(dn, type, compatible))
+static inline struct device_node *of_find_matching_node(
+	struct device_node *from,
+	const struct of_device_id *matches)
+{
+	return of_find_matching_node_and_match(from, matches, NULL);
+}
+#define for_each_matching_node(dn, matches) \
+	for (dn = of_find_matching_node(NULL, matches); dn; \
+	     dn = of_find_matching_node(dn, matches))
+#define for_each_matching_node_and_match(dn, matches, match) \
+	for (dn = of_find_matching_node_and_match(NULL, matches, match); \
+	     dn; dn = of_find_matching_node_and_match(dn, matches, match))
+#define for_each_node_with_property(dn, prop_name) \
+	for (dn = of_find_node_with_property(NULL, prop_name); dn; \
+	     dn = of_find_node_with_property(dn, prop_name))
+
+#define for_each_child_of_node(parent, child) \
+	list_for_each_entry(child, &parent->children, parent_list)
+#define for_each_available_child_of_node(parent, child) \
+	for (child = of_get_next_available_child(parent, NULL); child != NULL; \
+	     child = of_get_next_available_child(parent, child))
+
+/**
+ * of_property_read_bool - Findfrom a property
+ * @np:		device node from which the property value is to be read.
+ * @propname:	name of the property to be searched.
+ *
+ * Search for a property in a device node.
+ * Returns true if the property exist false otherwise.
+ */
+static inline bool of_property_read_bool(const struct device_node *np,
+					 const char *propname)
+{
+	struct property *prop = of_find_property(np, propname, NULL);
+
+	return prop ? true : false;
+}
+
+static inline int of_property_read_u8(const struct device_node *np,
+				       const char *propname,
+				       u8 *out_value)
+{
+	return of_property_read_u8_array(np, propname, out_value, 1);
+}
+
+static inline int of_property_read_u16(const struct device_node *np,
+				       const char *propname,
+				       u16 *out_value)
+{
+	return of_property_read_u16_array(np, propname, out_value, 1);
+}
+
+static inline int of_property_read_u32(const struct device_node *np,
+				       const char *propname,
+				       u32 *out_value)
+{
+	return of_property_read_u32_array(np, propname, out_value, 1);
+}
+
+/*
+ * struct property *prop;
+ * const __be32 *p;
+ * u32 u;
+ *
+ * of_property_for_each_u32(np, "propname", prop, p, u)
+ *         printk("U32 value: %x\n", u);
+ */
+#define of_property_for_each_u32(np, propname, prop, p, u)	\
+	for (prop = of_find_property(np, propname, NULL),	\
+		p = of_prop_next_u32(prop, NULL, &u);		\
+		p;						\
+		p = of_prop_next_u32(prop, p, &u))
+
+/*
+ * struct property *prop;
+ * const char *s;
+ *
+ * of_property_for_each_string(np, "propname", prop, s)
+ *         printk("String value: %s\n", s);
+ */
+#define of_property_for_each_string(np, propname, prop, s)	\
+	for (prop = of_find_property(np, propname, NULL),	\
+		s = of_prop_next_string(prop, NULL);		\
+		s;						\
+		s = of_prop_next_string(prop, s))
+
+static inline int of_property_write_u8(struct device_node *np,
+				       const char *propname, u8 value)
+{
+	return of_property_write_u8_array(np, propname, &value, 1);
+}
+
+static inline int of_property_write_u16(struct device_node *np,
+					const char *propname, u16 value)
+{
+	return of_property_write_u16_array(np, propname, &value, 1);
+}
+
+static inline int of_property_write_u32(struct device_node *np,
+					const char *propname,
+					u32 value)
+{
+	return of_property_write_u32_array(np, propname, &value, 1);
+}
+
+static inline int of_property_write_u64(struct device_node *np,
+					const char *propname,
+					u64 value)
+{
+	return of_property_write_u64_array(np, propname, &value, 1);
+}
+
 #endif /* __OF_H */
diff --git a/lib/string.c b/lib/string.c
index db4f2ae7db..f544b23664 100644
--- a/lib/string.c
+++ b/lib/string.c
@@ -22,6 +22,66 @@
 
 char * ___strtok;
 
+#ifndef __HAVE_ARCH_STRNICMP
+/**
+ * strnicmp - Case insensitive, length-limited string comparison
+ * @s1: One string
+ * @s2: The other string
+ * @len: the maximum number of characters to compare
+ */
+int strnicmp(const char *s1, const char *s2, size_t len)
+{
+	/* Yes, Virginia, it had better be unsigned */
+	unsigned char c1, c2;
+
+	if (!len)
+		return 0;
+
+	do {
+		c1 = *s1++;
+		c2 = *s2++;
+		if (!c1 || !c2)
+			break;
+		if (c1 == c2)
+			continue;
+		c1 = tolower(c1);
+		c2 = tolower(c2);
+		if (c1 != c2)
+			break;
+	} while (--len);
+	return (int)c1 - (int)c2;
+}
+EXPORT_SYMBOL(strnicmp);
+#endif
+
+#ifndef __HAVE_ARCH_STRCASECMP
+int strcasecmp(const char *s1, const char *s2)
+{
+	int c1, c2;
+
+	do {
+		c1 = tolower(*s1++);
+		c2 = tolower(*s2++);
+	} while (c1 == c2 && c1 != 0);
+	return c1 - c2;
+}
+EXPORT_SYMBOL(strcasecmp);
+#endif
+
+#ifndef __HAVE_ARCH_STRNCASECMP
+int strncasecmp(const char *s1, const char *s2, size_t n)
+{
+	int c1, c2;
+
+	do {
+		c1 = tolower(*s1++);
+		c2 = tolower(*s2++);
+	} while ((--n > 0) && c1 == c2 && c1 != 0);
+	return c1 - c2;
+}
+EXPORT_SYMBOL(strncasecmp);
+#endif
+
 #ifndef __HAVE_ARCH_STRCPY
 /**
  * strcpy - Copy a %NUL terminated string
diff --git a/net/eth.c b/net/eth.c
index 7240b4db9e..09b3bd5b20 100644
--- a/net/eth.c
+++ b/net/eth.c
@@ -296,7 +296,7 @@ static int eth_of_fixup(struct device_node *root)
 			continue;
 		}
 
-		node = of_find_node_by_path(root, edev->nodepath);
+		node = of_find_node_by_path(edev->nodepath);
 		if (!node) {
 			dev_dbg(&edev->dev, "%s: fixup node %s not found\n",
 					__func__, edev->nodepath);