DeviceTree updates for 4.6:

- New tool dtx_diff to diff DT files.
 
 - Sync kernel's dtc/libfdt to current dtc repo master.
 
 - Fix for reserved memory regions located in highmem.
 
 - Document standard unit suffixes for DT properties.
 
 - Various DT binding doc updates.
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Merge tag 'devicetree-for-4.6' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux

Pull DeviceTree updates from Rob Herring:

 - new tool 'dtx_diff' to diff DT files

 - sync kernel's dtc/libfdt to current dtc repo master

 - fix for reserved memory regions located in highmem

 - document standard unit suffixes for DT properties

 - various DT binding doc updates

* tag 'devicetree-for-4.6' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux:
  of: Add vendor prefix for eGalax_eMPIA Technology Inc
  Input: ads7846: Add description how to use internal reference (ADS7846)
  ARM: realview: add EB syscon variants to bindings
  devicetree: bindings: ARM: Use "uV" for micro-volt
  serial: fsl-imx-uart: Fix typo in fsl,dte-mode description
  of: add 'const' for of_property_*_string*() parameter '*np'
  of/unittest: fix infinite loop in of_unittest_destroy_tracked_overlays()
  of: alloc anywhere from memblock if range not specified
  kbuild: Allow using host dtc instead of kernel's copy
  of: resolver: Add missing of_node_get and of_node_put
  of: Add United Radiant Technology Corporation vendor prefix
  dt/bindings: add documentation on standard property unit suffixes
  scripts/dtc: Update to upstream commit b06e55c88b9b
  ARM: boot: Add an implementation of strnlen for libfdt
  scripts/dtc: dtx_diff - add info to error message
  dtc: create tool to diff device trees

drivers/of/base.c

@@ -1341,10 +1341,10 @@ EXPORT_SYMBOL_GPL(of_property_read_u64_array);
  *
  * 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,
+int of_property_read_string(const struct device_node *np, const char *propname,
 				const char **out_string)
 {
-	struct property *prop = of_find_property(np, propname, NULL);
+	const struct property *prop = of_find_property(np, propname, NULL);
 	if (!prop)
 		return -EINVAL;
 	if (!prop->value)
@@ -1365,10 +1365,10 @@ EXPORT_SYMBOL_GPL(of_property_read_string);
  * 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,
+int of_property_match_string(const struct device_node *np, const char *propname,
 			     const char *string)
 {
-	struct property *prop = of_find_property(np, propname, NULL);
+	const struct property *prop = of_find_property(np, propname, NULL);
 	size_t l;
 	int i;
 	const char *p, *end;
@@ -1404,10 +1404,11 @@ EXPORT_SYMBOL_GPL(of_property_match_string);
  * Don't call this function directly. It is a utility helper for the
  * of_property_read_string*() family of functions.
  */
-int of_property_read_string_helper(struct device_node *np, const char *propname,
-				   const char **out_strs, size_t sz, int skip)
+int of_property_read_string_helper(const struct device_node *np,
+				   const char *propname, const char **out_strs,
+				   size_t sz, int skip)
 {
-	struct property *prop = of_find_property(np, propname, NULL);
+	const struct property *prop = of_find_property(np, propname, NULL);
 	int l = 0, i = 0;
 	const char *p, *end;
 

drivers/of/of_reserved_mem.c

@@ -32,11 +32,13 @@ int __init __weak early_init_dt_alloc_reserved_memory_arch(phys_addr_t size,
 	phys_addr_t align, phys_addr_t start, phys_addr_t end, bool nomap,
 	phys_addr_t *res_base)
 {
+	phys_addr_t base;
 	/*
 	 * We use __memblock_alloc_base() because memblock_alloc_base()
 	 * panic()s on allocation failure.
 	 */
-	phys_addr_t base = __memblock_alloc_base(size, align, end);
+	end = !end ? MEMBLOCK_ALLOC_ANYWHERE : end;
+	base = __memblock_alloc_base(size, align, end);
 	if (!base)
 		return -ENOMEM;
 

drivers/of/resolver.c

@@ -36,12 +36,14 @@ static struct device_node *__of_find_node_by_full_name(struct device_node *node,
 
 	/* check */
 	if (of_node_cmp(node->full_name, full_name) == 0)
-		return node;
+		return of_node_get(node);
 
 	for_each_child_of_node(node, child) {
 		found = __of_find_node_by_full_name(child, full_name);
-		if (found != NULL)
+		if (found != NULL) {
+			of_node_put(child);
 			return found;
+		}
 	}
 
 	return NULL;
@@ -174,6 +176,7 @@ static int __of_adjust_phandle_ref(struct device_node *node,
 			if (of_prop_cmp(sprop->name, propstr) == 0)
 				break;
 		}
+		of_node_put(refnode);
 
 		if (!sprop) {
 			pr_err("%s: Could not find property '%s'\n",

drivers/of/unittest.c

@@ -1165,6 +1165,11 @@ static void of_unittest_destroy_tracked_overlays(void)
 				continue;
 
 			ret = of_overlay_destroy(id + overlay_first_id);
+			if (ret == -ENODEV) {
+				pr_warn("%s: no overlay to destroy for #%d\n",
+					__func__, id + overlay_first_id);
+				continue;
+			}
 			if (ret != 0) {
 				defers++;
 				pr_warn("%s: overlay destroy failed for #%d\n",