of: Use device_type helpers to access the node type

Remove directly accessing device_node.type pointer and use the accessors
instead. This will eventually allow removing the type pointer.

Cc: Frank Rowand <frowand.list@gmail.com>
Cc: devicetree@vger.kernel.org
Signed-off-by: Rob Herring <robh@kernel.org>

drivers/of/address.c

@@ -110,8 +110,8 @@ static int of_bus_pci_match(struct device_node *np)
 	 * "vci" is for the /chaos bridge on 1st-gen PCI powermacs
 	 * "ht" is hypertransport
 	 */
-	return !strcmp(np->type, "pci") || !strcmp(np->type, "pciex") ||
-		!strcmp(np->type, "vci") || !strcmp(np->type, "ht");
+	return of_node_is_type(np, "pci") || of_node_is_type(np, "pciex") ||
+		of_node_is_type(np, "vci") || of_node_is_type(np, "ht");
 }
 
 static void of_bus_pci_count_cells(struct device_node *np,

drivers/of/base.c

@@ -79,6 +79,13 @@ bool of_node_name_prefix(const struct device_node *np, const char *prefix)
 }
 EXPORT_SYMBOL(of_node_name_prefix);
 
+static bool __of_node_is_type(const struct device_node *np, const char *type)
+{
+	const char *match = __of_get_property(np, "device_type", NULL);
+
+	return np && match && type && !strcmp(match, type);
+}
+
 int of_n_addr_cells(struct device_node *np)
 {
 	u32 cells;
@@ -482,7 +489,7 @@ static int __of_device_is_compatible(const struct device_node *device,
 
 	/* Matching type is better than matching name */
 	if (type && type[0]) {
-		if (!device->type || of_node_cmp(type, device->type))
+		if (!__of_node_is_type(device, type))
 			return 0;
 		score += 2;
 	}
@@ -775,7 +782,7 @@ struct device_node *of_get_next_cpu_node(struct device_node *prev)
 	}
 	for (; next; next = next->sibling) {
 		if (!(of_node_name_eq(next, "cpu") ||
-		      (next->type && !of_node_cmp(next->type, "cpu"))))
+		      __of_node_is_type(next, "cpu")))
 			continue;
 		if (of_node_get(next))
 			break;
@@ -983,8 +990,7 @@ struct device_node *of_find_node_by_type(struct device_node *from,
 
 	raw_spin_lock_irqsave(&devtree_lock, flags);
 	for_each_of_allnodes_from(from, np)
-		if (np->type && (of_node_cmp(np->type, type) == 0)
-		    && of_node_get(np))
+		if (__of_node_is_type(np, type) && of_node_get(np))
 			break;
 	of_node_put(from);
 	raw_spin_unlock_irqrestore(&devtree_lock, flags);
@@ -2108,9 +2114,9 @@ struct device_node *of_find_next_cache_node(const struct device_node *np)
 	/* OF on pmac has nodes instead of properties named "l2-cache"
 	 * beneath CPU nodes.
 	 */
-	if (IS_ENABLED(CONFIG_PPC_PMAC) && !strcmp(np->type, "cpu"))
+	if (IS_ENABLED(CONFIG_PPC_PMAC) && of_node_is_type(np, "cpu"))
 		for_each_child_of_node(np, child)
-			if (!strcmp(child->type, "cache"))
+			if (of_node_is_type(child, "cache"))
 				return child;
 
 	return NULL;

drivers/of/device.c

@@ -209,7 +209,7 @@ static ssize_t of_device_get_modalias(struct device *dev, char *str, ssize_t len
 	/* Name & Type */
 	/* %p eats all alphanum characters, so %c must be used here */
 	csize = snprintf(str, len, "of:N%pOFn%c%s", dev->of_node, 'T',
-			 dev->of_node->type);
+			 of_node_get_device_type(dev->of_node));
 	tsize = csize;
 	len -= csize;
 	if (str)
@@ -279,7 +279,7 @@ EXPORT_SYMBOL_GPL(of_device_modalias);
  */
 void of_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 {
-	const char *compat;
+	const char *compat, *type;
 	struct alias_prop *app;
 	struct property *p;
 	int seen = 0;
@@ -289,8 +289,9 @@ void of_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 
 	add_uevent_var(env, "OF_NAME=%pOFn", dev->of_node);
 	add_uevent_var(env, "OF_FULLNAME=%pOF", dev->of_node);
-	if (dev->of_node->type && strcmp("<NULL>", dev->of_node->type) != 0)
-		add_uevent_var(env, "OF_TYPE=%s", dev->of_node->type);
+	type = of_node_get_device_type(dev->of_node);
+	if (type)
+		add_uevent_var(env, "OF_TYPE=%s", type);
 
 	/* Since the compatible field can contain pretty much anything
 	 * it's not really legal to split it out with commas. We split it