Merge tag 'devicetree-for-5.13' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux

Pull devicetree updates from Rob Herring:

 - Refactor powerpc and arm64 kexec DT handling to common code. This
   enables IMA on arm64.

 - Add kbuild support for applying DT overlays at build time. The first
   user are the DT unittests.

 - Fix kerneldoc formatting and W=1 warnings in drivers/of/

 - Fix handling 64-bit flag on PCI resources

 - Bump dtschema version required to v2021.2.1

 - Enable undocumented compatible checks for dtbs_check. This allows
   tracking of missing binding schemas.

 - DT docs improvements. Regroup the DT docs and add the example schema
   and DT kernel ABI docs to the doc build.

 - Convert Broadcom Bluetooth and video-mux bindings to schema

 - Add QCom sm8250 Venus video codec binding schema

 - Add vendor prefixes for AESOP, YIC System Co., Ltd, and Siliconfile
   Technologies Inc.

 - Cleanup of DT schema type references on common properties and
   standard unit properties

* tag 'devicetree-for-5.13' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux: (64 commits)
  powerpc: If kexec_build_elf_info() fails return immediately from elf64_load()
  powerpc: Free fdt on error in elf64_load()
  of: overlay: Fix kerneldoc warning in of_overlay_remove()
  of: linux/of.h: fix kernel-doc warnings
  of/pci: Add IORESOURCE_MEM_64 to resource flags for 64-bit memory addresses
  dt-bindings: bcm4329-fmac: add optional brcm,ccode-map
  docs: dt: update writing-schema.rst references
  dt-bindings: media: venus: Add sm8250 dt schema
  of: base: Fix spelling issue with function param 'prop'
  docs: dt: Add DT API documentation
  of: Add missing 'Return' section in kerneldoc comments
  of: Fix kerneldoc output formatting
  docs: dt: Group DT docs into relevant sub-sections
  docs: dt: Make 'Devicetree' wording more consistent
  docs: dt: writing-schema: Include the example schema in the doc build
  docs: dt: writing-schema: Remove spurious indentation
  dt-bindings: Fix reference in submitting-patches.rst to the DT ABI doc
  dt-bindings: ddr: Add optional manufacturer and revision ID to LPDDR3
  dt-bindings: media: video-interfaces: Drop the example
  devicetree: bindings: clock: Minor typo fix in the file armada3700-tbg-clock.txt
  ...

21 files changed, 937 insertions, 349 deletions

diff --git a/drivers/of/Makefile b/drivers/of/Makefile
index 6e1e5212f058..c13b982084a3 100644
--- a/drivers/of/Makefile
+++ b/drivers/of/Makefile
@@ -14,4 +14,10 @@ obj-$(CONFIG_OF_RESOLVE)  += resolver.o
 obj-$(CONFIG_OF_OVERLAY) += overlay.o
 obj-$(CONFIG_OF_NUMA) += of_numa.o
 
+ifdef CONFIG_KEXEC_FILE
+ifdef CONFIG_OF_FLATTREE
+obj-y	+= kexec.o
+endif
+endif
+
 obj-$(CONFIG_OF_UNITTEST) += unittest-data/
diff --git a/drivers/of/address.c b/drivers/of/address.c
index a2373fa4a571..aca94c348bd4 100644
--- a/drivers/of/address.c
+++ b/drivers/of/address.c
@@ -117,9 +117,12 @@ static unsigned int of_bus_pci_get_flags(const __be32 *addr)
 		flags |= IORESOURCE_IO;
 		break;
 	case 0x02: /* 32 bits */
-	case 0x03: /* 64 bits */
 		flags |= IORESOURCE_MEM;
 		break;
+
+	case 0x03: /* 64 bits */
+		flags |= IORESOURCE_MEM | IORESOURCE_MEM_64;
+		break;
 	}
 	if (w & 0x40000000)
 		flags |= IORESOURCE_PREFETCH;
@@ -861,6 +864,9 @@ static int __of_address_to_resource(struct device_node *dev,
 
 /**
  * of_address_to_resource - Translate device tree address and return as resource
+ * @dev:	Caller's Device Node
+ * @index:	Index into the array
+ * @r:		Pointer to resource array
  *
  * Note that if your address is a PIO address, the conversion will fail if
  * the physical address can't be internally converted to an IO token with
diff --git a/drivers/of/base.c b/drivers/of/base.c
index 8a348f0d3c5e..48e941f99558 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -244,7 +244,7 @@ struct device_node *__of_find_all_nodes(struct device_node *prev)
  * @prev:	Previous node or NULL to start iteration
  *		of_node_put() will be called on it
  *
- * Returns a node pointer with refcount incremented, use
+ * Return: A node pointer with refcount incremented, use
  * of_node_put() on it when done.
  */
 struct device_node *of_find_all_nodes(struct device_node *prev)
@@ -305,7 +305,7 @@ bool __weak arch_match_cpu_phys_id(int cpu, u64 phys_id)
 	return (u32)phys_id == cpu;
 }
 
-/**
+/*
  * Checks if the given "prop_name" property holds the physical id of the
  * core/thread corresponding to the logical cpu 'cpu'. If 'thread' is not
  * NULL, local thread number within the core is returned in it.
@@ -374,7 +374,7 @@ bool __weak arch_find_n_match_cpu_physical_id(struct device_node *cpun,
  * before booting secondary cores. This function uses arch_match_cpu_phys_id
  * which can be overridden by architecture specific implementation.
  *
- * Returns a node pointer for the logical cpu with refcount incremented, use
+ * Return: A node pointer for the logical cpu with refcount incremented, use
  * of_node_put() on it when done. Returns NULL if not found.
  */
 struct device_node *of_get_cpu_node(int cpu, unsigned int *thread)
@@ -394,8 +394,8 @@ EXPORT_SYMBOL(of_get_cpu_node);
  *
  * @cpu_node: Pointer to the device_node for CPU.
  *
- * Returns the logical CPU number of the given CPU device_node.
- * Returns -ENODEV if the CPU is not found.
+ * Return: The logical CPU number of the given CPU device_node or -ENODEV if the
+ * CPU is not found.
  */
 int of_cpu_node_to_id(struct device_node *cpu_node)
 {
@@ -427,7 +427,7 @@ EXPORT_SYMBOL(of_cpu_node_to_id);
  * bindings. This function check for both and returns the idle state node for
  * the requested index.
  *
- * In case an idle state node is found at @index, the refcount is incremented
+ * Return: An idle state node if found at @index. The refcount is incremented
  * for it, so call of_node_put() on it when done. Returns NULL if not found.
  */
 struct device_node *of_get_cpu_state_node(struct device_node *cpu_node,
@@ -561,7 +561,7 @@ int of_device_compatible_match(struct device_node *device,
  * of_machine_is_compatible - Test root of device tree for a given compatible value
  * @compat: compatible string to look for in root node's compatible property.
  *
- * Returns a positive integer if the root node has the given value in its
+ * Return: A positive integer if the root node has the given value in its
  * compatible property.
  */
 int of_machine_is_compatible(const char *compat)
@@ -583,7 +583,7 @@ EXPORT_SYMBOL(of_machine_is_compatible);
  *
  *  @device: Node to check for availability, with locks already held
  *
- *  Returns true if the status property is absent or set to "okay" or "ok",
+ *  Return: True if the status property is absent or set to "okay" or "ok",
  *  false otherwise
  */
 static bool __of_device_is_available(const struct device_node *device)
@@ -611,7 +611,7 @@ static bool __of_device_is_available(const struct device_node *device)
  *
  *  @device: Node to check for availability
  *
- *  Returns true if the status property is absent or set to "okay" or "ok",
+ *  Return: True if the status property is absent or set to "okay" or "ok",
  *  false otherwise
  */
 bool of_device_is_available(const struct device_node *device)
@@ -632,7 +632,7 @@ EXPORT_SYMBOL(of_device_is_available);
  *
  *  @device: Node to check for endianness
  *
- *  Returns true if the device has a "big-endian" property, or if the kernel
+ *  Return: True if the device has a "big-endian" property, or if the kernel
  *  was compiled for BE *and* the device has a "native-endian" property.
  *  Returns false otherwise.
  *
@@ -651,11 +651,11 @@ bool of_device_is_big_endian(const struct device_node *device)
 EXPORT_SYMBOL(of_device_is_big_endian);
 
 /**
- *	of_get_parent - Get a node's parent if any
- *	@node:	Node to get parent
+ * of_get_parent - Get a node's parent if any
+ * @node:	Node to get parent
  *
- *	Returns a node pointer with refcount incremented, use
- *	of_node_put() on it when done.
+ * Return: A node pointer with refcount incremented, use
+ * of_node_put() on it when done.
  */
 struct device_node *of_get_parent(const struct device_node *node)
 {
@@ -673,15 +673,15 @@ struct device_node *of_get_parent(const struct device_node *node)
 EXPORT_SYMBOL(of_get_parent);
 
 /**
- *	of_get_next_parent - Iterate to a node's parent
- *	@node:	Node to get parent of
+ * of_get_next_parent - Iterate to a node's parent
+ * @node:	Node to get parent of
  *
- *	This is like of_get_parent() except that it drops the
- *	refcount on the passed node, making it suitable for iterating
- *	through a node's parents.
+ * This is like of_get_parent() except that it drops the
+ * refcount on the passed node, making it suitable for iterating
+ * through a node's parents.
  *
- *	Returns a node pointer with refcount incremented, use
- *	of_node_put() on it when done.
+ * Return: A node pointer with refcount incremented, use
+ * of_node_put() on it when done.
  */
 struct device_node *of_get_next_parent(struct device_node *node)
 {
@@ -719,13 +719,13 @@ static struct device_node *__of_get_next_child(const struct device_node *node,
 	     child = __of_get_next_child(parent, child))
 
 /**
- *	of_get_next_child - Iterate a node childs
- *	@node:	parent node
- *	@prev:	previous child of the parent node, or NULL to get first
+ * of_get_next_child - Iterate a node childs
+ * @node:	parent node
+ * @prev:	previous child of the parent node, or NULL to get first
  *
- *	Returns a node pointer with refcount incremented, use of_node_put() on
- *	it when done. Returns NULL when prev is the last child. Decrements the
- *	refcount of prev.
+ * Return: A node pointer with refcount incremented, use of_node_put() on
+ * it when done. Returns NULL when prev is the last child. Decrements the
+ * refcount of prev.
  */
 struct device_node *of_get_next_child(const struct device_node *node,
 	struct device_node *prev)
@@ -741,12 +741,12 @@ struct device_node *of_get_next_child(const struct device_node *node,
 EXPORT_SYMBOL(of_get_next_child);
 
 /**
- *	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
+ * 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").
+ * 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)
@@ -772,12 +772,12 @@ struct device_node *of_get_next_available_child(const struct device_node *node,
 EXPORT_SYMBOL(of_get_next_available_child);
 
 /**
- *	of_get_next_cpu_node - Iterate on cpu nodes
- *	@prev:	previous child of the /cpus node, or NULL to get first
+ * of_get_next_cpu_node - Iterate on cpu nodes
+ * @prev:	previous child of the /cpus node, or NULL to get first
  *
- *	Returns a cpu node pointer with refcount incremented, use of_node_put()
- *	on it when done. Returns NULL when prev is the last child. Decrements
- *	the refcount of prev.
+ * Return: A cpu node pointer with refcount incremented, use of_node_put()
+ * on it when done. Returns NULL when prev is the last child. Decrements
+ * the refcount of prev.
  */
 struct device_node *of_get_next_cpu_node(struct device_node *prev)
 {
@@ -816,7 +816,7 @@ EXPORT_SYMBOL(of_get_next_cpu_node);
  * Lookup child node whose compatible property contains the given compatible
  * string.
  *
- * Returns a node pointer with refcount incremented, use of_node_put() on it
+ * Return: a node pointer with refcount incremented, use of_node_put() on it
  * when done; or NULL if not found.
  */
 struct device_node *of_get_compatible_child(const struct device_node *parent,
@@ -834,15 +834,15 @@ struct device_node *of_get_compatible_child(const struct device_node *parent,
 EXPORT_SYMBOL(of_get_compatible_child);
 
 /**
- *	of_get_child_by_name - Find the child node by name for a given parent
- *	@node:	parent node
- *	@name:	child name to look for.
+ * 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
+ * This function looks for child node for given matching name
  *
- *	Returns a node pointer if found, with refcount incremented, use
- *	of_node_put() on it when done.
- *	Returns NULL if node is not found.
+ * Return: A node pointer if found, with refcount incremented, use
+ * of_node_put() on it when done.
+ * Returns NULL if node is not found.
  */
 struct device_node *of_get_child_by_name(const struct device_node *node,
 				const char *name)
@@ -893,22 +893,22 @@ struct device_node *__of_find_node_by_full_path(struct device_node *node,
 }
 
 /**
- *	of_find_node_opts_by_path - Find a node matching a full OF path
- *	@path: Either the full path to match, or if the path does not
- *	       start with '/', the name of a property of the /aliases
- *	       node (an alias).  In the case of an alias, the node
- *	       matching the alias' value will be returned.
- *	@opts: Address of a pointer into which to store the start of
- *	       an options string appended to the end of the path with
- *	       a ':' separator.
- *
- *	Valid paths:
- *		/foo/bar	Full path
- *		foo		Valid alias
- *		foo/bar		Valid alias + relative path
- *
- *	Returns a node pointer with refcount incremented, use
- *	of_node_put() on it when done.
+ * of_find_node_opts_by_path - Find a node matching a full OF path
+ * @path: Either the full path to match, or if the path does not
+ *       start with '/', the name of a property of the /aliases
+ *       node (an alias).  In the case of an alias, the node
+ *       matching the alias' value will be returned.
+ * @opts: Address of a pointer into which to store the start of
+ *       an options string appended to the end of the path with
+ *       a ':' separator.
+ *
+ * Valid paths:
+ *  * /foo/bar	Full path
+ *  * foo	Valid alias
+ *  * foo/bar	Valid alias + relative path
+ *
+ * Return: A node pointer with refcount incremented, use
+ * of_node_put() on it when done.
  */
 struct device_node *of_find_node_opts_by_path(const char *path, const char **opts)
 {
@@ -958,15 +958,15 @@ struct device_node *of_find_node_opts_by_path(const char *path, const char **opt
 EXPORT_SYMBOL(of_find_node_opts_by_path);
 
 /**
- *	of_find_node_by_name - Find a node by its "name" property
- *	@from:	The node to start searching from or NULL; the node
+ * 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. of_node_put() will be called on @from.
- *	@name:	The name string to match against
+ * @name:	The name string to match against
  *
- *	Returns a node pointer with refcount incremented, use
- *	of_node_put() on it when done.
+ * Return: A node pointer with refcount incremented, use
+ * of_node_put() on it when done.
  */
 struct device_node *of_find_node_by_name(struct device_node *from,
 	const char *name)
@@ -985,16 +985,16 @@ struct device_node *of_find_node_by_name(struct device_node *from,
 EXPORT_SYMBOL(of_find_node_by_name);
 
 /**
- *	of_find_node_by_type - Find a node by its "device_type" property
- *	@from:	The node to start searching from, or NULL to start searching
+ * of_find_node_by_type - Find a node by its "device_type" property
+ * @from:	The node to start searching from, or NULL to start searching
  *		the entire device tree. The node you pass will not be
  *		searched, only the next one will; typically, you pass
  *		what the previous call returned. of_node_put() will be
  *		called on from for you.
- *	@type:	The type string to match against
+ * @type:	The type string to match against
  *
- *	Returns a node pointer with refcount incremented, use
- *	of_node_put() on it when done.
+ * Return: A node pointer with refcount incremented, use
+ * of_node_put() on it when done.
  */
 struct device_node *of_find_node_by_type(struct device_node *from,
 	const char *type)
@@ -1013,18 +1013,18 @@ struct device_node *of_find_node_by_type(struct device_node *from,
 EXPORT_SYMBOL(of_find_node_by_type);
 
 /**
- *	of_find_compatible_node - Find a node based on type and one of the
+ * 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. of_node_put() will be called on it
- *	@type:		The type string to match "device_type" or NULL to ignore
- *	@compatible:	The string to match to one of the tokens in the device
- *			"compatible" list.
- *
- *	Returns a node pointer with refcount incremented, use
- *	of_node_put() on it when done.
+ * @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. of_node_put() will be called on it
+ * @type:	The type string to match "device_type" or NULL to ignore
+ * @compatible:	The string to match to one of the tokens in the device
+ *		"compatible" list.
+ *
+ * Return: A node pointer with refcount incremented, use
+ * of_node_put() on it when done.
  */
 struct device_node *of_find_compatible_node(struct device_node *from,
 	const char *type, const char *compatible)
@@ -1044,16 +1044,16 @@ struct device_node *of_find_compatible_node(struct device_node *from,
 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. of_node_put() will be called on it
- *	@prop_name:	The name of the property to look for.
- *
- *	Returns a node pointer with refcount incremented, use
- *	of_node_put() on it when done.
+ * 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. of_node_put() will be called on it
+ * @prop_name:	The name of the property to look for.
+ *
+ * Return: A node pointer with refcount incremented, use
+ * of_node_put() on it when done.
  */
 struct device_node *of_find_node_with_property(struct device_node *from,
 	const char *prop_name)
@@ -1102,10 +1102,10 @@ const struct of_device_id *__of_match_node(const struct of_device_id *matches,
 
 /**
  * of_match_node - Tell if a 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
+ * @matches:	array of of device match structures to search in
+ * @node:	the of device structure to match against
  *
- *	Low level utility function used by device matching.
+ * Low level utility function used by device matching.
  */
 const struct of_device_id *of_match_node(const struct of_device_id *matches,
 					 const struct device_node *node)
@@ -1121,17 +1121,17 @@ const struct of_device_id *of_match_node(const struct of_device_id *matches,
 EXPORT_SYMBOL(of_match_node);
 
 /**
- *	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. of_node_put() will be called on it
- *	@matches:	array of of device match structures to search in
- *	@match		Updated to point at the matches entry which matched
- *
- *	Returns a node pointer with refcount incremented, use
- *	of_node_put() on it when done.
+ * 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. of_node_put() will be called on it
+ * @matches:	array of of device match structures to search in
+ * @match:	Updated to point at the matches entry which matched
+ *
+ * Return: A node pointer with refcount incremented, use
+ * of_node_put() on it when done.
  */
 struct device_node *of_find_matching_node_and_match(struct device_node *from,
 					const struct of_device_id *matches,
@@ -1170,7 +1170,7 @@ EXPORT_SYMBOL(of_find_matching_node_and_match);
  * It does this by stripping the manufacturer prefix (as delimited by a ',')
  * from the first entry in the compatible list property.
  *
- * This routine returns 0 on success, <0 on failure.
+ * Return: This routine returns 0 on success, <0 on failure.
  */
 int of_modalias_node(struct device_node *node, char *modalias, int len)
 {
@@ -1190,7 +1190,7 @@ EXPORT_SYMBOL_GPL(of_modalias_node);
  * of_find_node_by_phandle - Find a node given a phandle
  * @handle:	phandle of the node to find
  *
- * Returns a node pointer with refcount incremented, use
+ * Return: A node pointer with refcount incremented, use
  * of_node_put() on it when done.
  */
 struct device_node *of_find_node_by_phandle(phandle handle)
@@ -1426,7 +1426,7 @@ static int __of_parse_phandle_with_args(const struct device_node *np,
  * @index: For properties holding a table of phandles, this is the index into
  *         the table
  *
- * Returns the device_node pointer with refcount incremented.  Use
+ * Return: The device_node pointer with refcount incremented.  Use
  * of_node_put() on it when done.
  */
 struct device_node *of_parse_phandle(const struct device_node *np,
@@ -1460,21 +1460,21 @@ EXPORT_SYMBOL(of_parse_phandle);
  * Caller is responsible to call of_node_put() on the returned out_args->np
  * pointer.
  *
- * Example:
+ * Example::
  *
- * phandle1: node1 {
+ *  phandle1: node1 {
  *	#list-cells = <2>;
- * }
+ *  };
  *
- * phandle2: node2 {
+ *  phandle2: node2 {
  *	#list-cells = <1>;
- * }
+ *  };
  *
- * node3 {
+ *  node3 {
  *	list = <&phandle1 1 2 &phandle2 3>;
- * }
+ *  };
  *
- * To get a device_node of the `node2' node you may call this:
+ * To get a device_node of the ``node2`` node you may call this:
  * of_parse_phandle_with_args(node3, "list", "#list-cells", 1, &args);
  */
 int of_parse_phandle_with_args(const struct device_node *np, const char *list_name,
@@ -1512,29 +1512,29 @@ EXPORT_SYMBOL(of_parse_phandle_with_args);
  * Caller is responsible to call of_node_put() on the returned out_args->np
  * pointer.
  *
- * Example:
+ * Example::
  *
- * phandle1: node1 {
- *	#list-cells = <2>;
- * }
+ *  phandle1: node1 {
+ *  	#list-cells = <2>;
+ *  };
  *
- * phandle2: node2 {
- *	#list-cells = <1>;
- * }
+ *  phandle2: node2 {
+ *  	#list-cells = <1>;
+ *  };
  *
- * phandle3: node3 {
- * 	#list-cells = <1>;
- * 	list-map = <0 &phandle2 3>,
- * 		   <1 &phandle2 2>,
- * 		   <2 &phandle1 5 1>;
- *	list-map-mask = <0x3>;
- * };
+ *  phandle3: node3 {
+ *  	#list-cells = <1>;
+ *  	list-map = <0 &phandle2 3>,
+ *  		   <1 &phandle2 2>,
+ *  		   <2 &phandle1 5 1>;
+ *  	list-map-mask = <0x3>;
+ *  };
  *
- * node4 {
- *	list = <&phandle1 1 2 &phandle3 0>;
- * }
+ *  node4 {
+ *  	list = <&phandle1 1 2 &phandle3 0>;
+ *  };
  *
- * To get a device_node of the `node2' node you may call this:
+ * To get a device_node of the ``node2`` node you may call this:
  * of_parse_phandle_with_args(node4, "list", "list", 1, &args);
  */
 int of_parse_phandle_with_args_map(const struct device_node *np,
@@ -1694,19 +1694,19 @@ EXPORT_SYMBOL(of_parse_phandle_with_args_map);
  * Caller is responsible to call of_node_put() on the returned out_args->np
  * pointer.
  *
- * Example:
+ * Example::
  *
- * phandle1: node1 {
- * }
+ *  phandle1: node1 {
+ *  };
  *
- * phandle2: node2 {
- * }
+ *  phandle2: node2 {
+ *  };
  *
- * node3 {
- *	list = <&phandle1 0 2 &phandle2 2 3>;
- * }
+ *  node3 {
+ *  	list = <&phandle1 0 2 &phandle2 2 3>;
+ *  };
  *
- * To get a device_node of the `node2' node you may call this:
+ * To get a device_node of the ``node2`` node you may call this:
  * of_parse_phandle_with_fixed_args(node3, "list", 2, 1, &args);
  */
 int of_parse_phandle_with_fixed_args(const struct device_node *np,
@@ -1726,7 +1726,7 @@ EXPORT_SYMBOL(of_parse_phandle_with_fixed_args);
  * @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
+ * Return: 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
@@ -1774,6 +1774,8 @@ EXPORT_SYMBOL(of_count_phandle_with_args);
 
 /**
  * __of_add_property - Add a property to a node without lock operations
+ * @np:		Caller's Device Node
+ * @prop:	Property to add
  */
 int __of_add_property(struct device_node *np, struct property *prop)
 {
@@ -1795,6 +1797,8 @@ int __of_add_property(struct device_node *np, struct property *prop)
 
 /**
  * of_add_property - Add a property to a node
+ * @np:		Caller's Device Node
+ * @prop:	Property to add
  */
 int of_add_property(struct device_node *np, struct property *prop)
 {
@@ -1839,6 +1843,8 @@ int __of_remove_property(struct device_node *np, struct property *prop)
 
 /**
  * of_remove_property - Remove a property from a node.
+ * @np:		Caller's Device Node
+ * @prop:	Property to remove
  *
  * Note that we don't actually remove it, since we have given out
  * who-knows-how-many pointers to the data using get-property.
@@ -1946,13 +1952,12 @@ static void of_alias_add(struct alias_prop *ap, struct device_node *np,
 
 /**
  * of_alias_scan - Scan all properties of the 'aliases' node
+ * @dt_alloc:	An allocator that provides a virtual address to memory
+ *		for storing the resulting tree
  *
  * The function scans all the properties of the 'aliases' node and populates
  * the global lookup table with the properties.  It returns the
  * number of alias properties found, or an error code in case of failure.
- *
- * @dt_alloc:	An allocator that provides a virtual address to memory
- *		for storing the resulting tree
  */
 void of_alias_scan(void * (*dt_alloc)(u64 size, u64 align))
 {
@@ -2021,7 +2026,9 @@ void of_alias_scan(void * (*dt_alloc)(u64 size, u64 align))
  * @stem:	Alias stem of the given device_node
  *
  * The function travels the lookup table to get the alias id for the given
- * device_node and alias stem.  It returns the alias id if found.
+ * device_node and alias stem.
+ *
+ * Return: The alias id if found.
  */
 int of_alias_get_id(struct device_node *np, const char *stem)
 {
@@ -2125,13 +2132,14 @@ EXPORT_SYMBOL_GPL(of_alias_get_highest_id);
 
 /**
  * of_console_check() - Test and setup console for DT setup
- * @dn - Pointer to device node
- * @name - Name to use for preferred console without index. ex. "ttyS"
- * @index - Index to use for preferred console.
+ * @dn: Pointer to device node
+ * @name: Name to use for preferred console without index. ex. "ttyS"
+ * @index: Index to use for preferred console.
  *
  * Check if the given device node matches the stdout-path property in the
- * /chosen node. If it does then register it as the preferred console and return
- * TRUE. Otherwise return FALSE.
+ * /chosen node. If it does then register it as the preferred console.
+ *
+ * Return: TRUE if console successfully setup. Otherwise return FALSE.
  */
 bool of_console_check(struct device_node *dn, char *name, int index)
 {
@@ -2147,12 +2155,12 @@ bool of_console_check(struct device_node *dn, char *name, int index)
 EXPORT_SYMBOL_GPL(of_console_check);
 
 /**
- *	of_find_next_cache_node - Find a node's subsidiary cache
- *	@np:	node of type "cpu" or "cache"
+ * of_find_next_cache_node - Find a node's subsidiary cache
+ * @np:	node of type "cpu" or "cache"
  *
- *	Returns a node pointer with refcount incremented, use
- *	of_node_put() on it when done.  Caller should hold a reference
- *	to np.
+ * Return: A node pointer with refcount incremented, use
+ * of_node_put() on it when done.  Caller should hold a reference
+ * to np.
  */
 struct device_node *of_find_next_cache_node(const struct device_node *np)
 {
@@ -2182,7 +2190,7 @@ struct device_node *of_find_next_cache_node(const struct device_node *np)
  *
  * @cpu: cpu number(logical index) for which the last cache level is needed
  *
- * Returns the the level at which the last cache is present. It is exactly
+ * Return: The the level at which the last cache is present. It is exactly
  * same as  the total number of cache levels for the given logical cpu.
  */
 int of_find_last_cache_level(unsigned int cpu)
diff --git a/drivers/of/device.c b/drivers/of/device.c
index 6cb86de404f1..c5a9473a5fb1 100644
--- a/drivers/of/device.c
+++ b/drivers/of/device.c
@@ -53,7 +53,7 @@ int of_device_add(struct platform_device *ofdev)
 }
 
 /**
- * of_dma_configure - Setup DMA configuration
+ * of_dma_configure_id - Setup DMA configuration
  * @dev:	Device to apply DMA configuration
  * @np:		Pointer to OF node having DMA configuration
  * @force_dma:  Whether device is to be set up by of_dma_configure() even if
@@ -258,6 +258,9 @@ EXPORT_SYMBOL_GPL(of_device_request_module);
 
 /**
  * of_device_modalias - Fill buffer with newline terminated modalias string
+ * @dev:	Calling device
+ * @str:	Modalias string
+ * @len:	Size of @str
  */
 ssize_t of_device_modalias(struct device *dev, char *str, ssize_t len)
 {
@@ -275,6 +278,8 @@ EXPORT_SYMBOL_GPL(of_device_modalias);
 
 /**
  * of_device_uevent - Display OF related uevent information
+ * @dev:	Device to apply DMA configuration
+ * @env:	Kernel object's userspace event reference
  */
 void of_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 {
diff --git a/drivers/of/dynamic.c b/drivers/of/dynamic.c
index 9a824decf61f..cd3821a6444f 100644
--- a/drivers/of/dynamic.c
+++ b/drivers/of/dynamic.c
@@ -27,7 +27,7 @@ static struct device_node *kobj_to_device_node(struct kobject *kobj)
  * @node:	Node to inc refcount, NULL is supported to simplify writing of
  *		callers
  *
- * Returns node.
+ * Return: The node with refcount incremented.
  */
 struct device_node *of_node_get(struct device_node *node)
 {
@@ -104,7 +104,8 @@ int of_reconfig_notify(unsigned long action, struct of_reconfig_data *p)
  * @arg		- argument of the of notifier
  *
  * Returns the new state of a device based on the notifier used.
- * Returns 0 on device going from enabled to disabled, 1 on device
+ *
+ * Return: 0 on device going from enabled to disabled, 1 on device
  * going from disabled to enabled and -1 on no change.
  */
 int of_reconfig_get_state_change(unsigned long action, struct of_reconfig_data *pr)
@@ -229,6 +230,7 @@ static void __of_attach_node(struct device_node *np)
 
 /**
  * of_attach_node() - Plug a device node into the tree and global list.
+ * @np:		Pointer to the caller's Device Node
  */
 int of_attach_node(struct device_node *np)
 {
@@ -281,6 +283,7 @@ void __of_detach_node(struct device_node *np)
 
 /**
  * of_detach_node() - "Unplug" a node from the device tree.
+ * @np:		Pointer to the caller's Device Node
  */
 int of_detach_node(struct device_node *np)
 {
@@ -318,7 +321,7 @@ static void property_list_free(struct property *prop_list)
 
 /**
  * of_node_release() - release a dynamically allocated node
- * @kref: kref element of the node to be released
+ * @kobj: kernel object of the node to be released
  *
  * In of_node_put() this function is passed to kref_put() as the destructor.
  */
@@ -372,7 +375,8 @@ void of_node_release(struct kobject *kobj)
  * property structure and the property name & contents. The property's
  * flags have the OF_DYNAMIC bit set so that we can differentiate between
  * dynamically allocated properties and not.
- * Returns the newly allocated property or NULL on out of memory error.
+ *
+ * Return: The newly allocated property or NULL on out of memory error.
  */
 struct property *__of_prop_dup(const struct property *prop, gfp_t allocflags)
 {
@@ -415,7 +419,7 @@ struct property *__of_prop_dup(const struct property *prop, gfp_t allocflags)
  * another node.  The node data are dynamically allocated and all the node
  * flags have the OF_DYNAMIC & OF_DETACHED bits set.
  *
- * Returns the newly allocated node or NULL on out of memory error.
+ * Return: The newly allocated node or NULL on out of memory error.
  */
 struct device_node *__of_node_dup(const struct device_node *np,
 				  const char *full_name)
@@ -781,7 +785,8 @@ static int __of_changeset_apply(struct of_changeset *ocs)
  * Any side-effects of live tree state changes are applied here on
  * success, like creation/destruction of devices and side-effects
  * like creation of sysfs properties and directories.
- * Returns 0 on success, a negative error value in case of an error.
+ *
+ * Return: 0 on success, a negative error value in case of an error.
  * On error the partially applied effects are reverted.
  */
 int of_changeset_apply(struct of_changeset *ocs)
@@ -875,7 +880,8 @@ static int __of_changeset_revert(struct of_changeset *ocs)
  * was before the application.
  * Any side-effects like creation/destruction of devices and
  * removal of sysfs properties and directories are applied.
- * Returns 0 on success, a negative error value in case of an error.
+ *
+ * Return: 0 on success, a negative error value in case of an error.
  */
 int of_changeset_revert(struct of_changeset *ocs)
 {
@@ -903,7 +909,8 @@ EXPORT_SYMBOL_GPL(of_changeset_revert);
  * + OF_RECONFIG_ADD_PROPERTY
  * + OF_RECONFIG_REMOVE_PROPERTY,
  * + OF_RECONFIG_UPDATE_PROPERTY
- * Returns 0 on success, a negative error value in case of an error.
+ *
+ * Return: 0 on success, a negative error value in case of an error.
  */
 int of_changeset_action(struct of_changeset *ocs, unsigned long action,
 		struct device_node *np, struct property *prop)
diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index adb26aff481d..ba17a80b8c79 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -282,7 +282,7 @@ static void reverse_nodes(struct device_node *parent)
  * @dad: Parent struct device_node
  * @nodepp: The device_node tree created by the call
  *
- * It returns the size of unflattened device tree or error code
+ * Return: The size of unflattened device tree or error code
  */
 static int unflatten_dt_nodes(const void *blob,
 			      void *mem,
@@ -351,11 +351,6 @@ static int unflatten_dt_nodes(const void *blob,
 
 /**
  * __unflatten_device_tree - create tree of device_nodes from flat blob
- *
- * unflattens a device-tree, creating the
- * tree of struct device_node. It also fills the "name" and "type"
- * pointers of the nodes so the normal device-tree walking functions
- * can be used.
  * @blob: The blob to expand
  * @dad: Parent device node
  * @mynodes: The device_node tree created by the call
@@ -363,7 +358,11 @@ static int unflatten_dt_nodes(const void *blob,
  * for the resulting tree
  * @detached: if true set OF_DETACHED on @mynodes
  *
- * Returns NULL on failure or the memory chunk containing the unflattened
+ * unflattens a device-tree, creating the tree of struct device_node. It also
+ * fills the "name" and "type" pointers of the nodes so the normal device-tree
+ * walking functions can be used.
+ *
+ * Return: NULL on failure or the memory chunk containing the unflattened
  * device tree on success.
  */
 void *__unflatten_device_tree(const void *blob,
@@ -452,7 +451,7 @@ static DEFINE_MUTEX(of_fdt_unflatten_mutex);
  * pointers of the nodes so the normal device-tree walking functions
  * can be used.
  *
- * Returns NULL on failure or the memory chunk containing the unflattened
+ * Return: NULL on failure or the memory chunk containing the unflattened
  * device tree on success.
  */
 void *of_fdt_unflatten_tree(const unsigned long *blob,
@@ -480,7 +479,7 @@ void *initial_boot_params __ro_after_init;
 
 static u32 of_fdt_crc32;
 
-/**
+/*
  * __reserved_mem_reserve_reg() - reserve all memory described in 'reg' property
  */
 static int __init __reserved_mem_reserve_reg(unsigned long node,
@@ -526,7 +525,7 @@ static int __init __reserved_mem_reserve_reg(unsigned long node,
 	return 0;
 }
 
-/**
+/*
  * __reserved_mem_check_root() - check if #size-cells, #address-cells provided
  * in /reserved-memory matches the values supported by the current implementation,
  * also check if ranges property has been provided
@@ -549,8 +548,8 @@ static int __init __reserved_mem_check_root(unsigned long node)
 	return 0;
 }
 
-/**
- * fdt_scan_reserved_mem() - scan a single FDT node for reserved memory
+/*
+ * __fdt_scan_reserved_mem() - scan a single FDT node for reserved memory
  */
 static int __init __fdt_scan_reserved_mem(unsigned long node, const char *uname,
 					  int depth, void *data)
@@ -660,6 +659,7 @@ int __init of_scan_flat_dt(int (*it)(unsigned long node,
 
 /**
  * of_scan_flat_dt_subnodes - scan sub-nodes of a node call callback on each.
+ * @parent: parent node
  * @it: callback function
  * @data: context data pointer
  *
@@ -699,7 +699,7 @@ int __init of_get_flat_dt_subnode_by_name(unsigned long node, const char *uname)
 	return fdt_subnode_offset(initial_boot_params, node, uname);
 }
 
-/**
+/*
  * of_get_flat_dt_root - find the root node in the flat blob
  */
 unsigned long __init of_get_flat_dt_root(void)
@@ -707,7 +707,7 @@ unsigned long __init of_get_flat_dt_root(void)
 	return 0;
 }
 
-/**
+/*
  * of_get_flat_dt_prop - Given a node in the flat blob, return the property ptr
  *
  * This function can be used within scan_flattened_dt callback to get
@@ -726,7 +726,7 @@ const void *__init of_get_flat_dt_prop(unsigned long node, const char *name,
  * @node: node to test
  * @compat: compatible string to compare with compatible list.
  *
- * On match, returns a non-zero value with smaller values returned for more
+ * Return: a non-zero value on match with smaller values returned for more
  * specific compatible values.
  */
 static int of_fdt_is_compatible(const void *blob,
@@ -761,7 +761,7 @@ int __init of_flat_dt_is_compatible(unsigned long node, const char *compat)
 	return of_fdt_is_compatible(initial_boot_params, node, compat);
 }
 
-/**
+/*
  * of_flat_dt_match - Return true if node matches a list of compatible values
  */
 static int __init of_flat_dt_match(unsigned long node, const char *const *compat)
@@ -781,8 +781,8 @@ static int __init of_flat_dt_match(unsigned long node, const char *const *compat
 	return score;
 }
 
-/**
- * of_get_flat_dt_prop - Given a node in the flat blob, return the phandle
+/*
+ * of_get_flat_dt_phandle - Given a node in the flat blob, return the phandle
  */
 uint32_t __init of_get_flat_dt_phandle(unsigned long node)
 {
@@ -957,7 +957,7 @@ int __init early_init_dt_scan_chosen_stdout(void)
 }
 #endif
 
-/**
+/*
  * early_init_dt_scan_root - fetch the top level address and size cells
  */
 int __init early_init_dt_scan_root(unsigned long node, const char *uname,
@@ -993,7 +993,7 @@ u64 __init dt_mem_next_cell(int s, const __be32 **cellp)
 	return of_read_number(p, s);
 }
 
-/**
+/*
  * early_init_dt_scan_memory - Look for and parse memory nodes
  */
 int __init early_init_dt_scan_memory(unsigned long node, const char *uname,
diff --git a/drivers/of/irq.c b/drivers/of/irq.c
index 25d17b8a1a1a..352e14b007e7 100644
--- a/drivers/of/irq.c
+++ b/drivers/of/irq.c
@@ -48,7 +48,7 @@ EXPORT_SYMBOL_GPL(irq_of_parse_and_map);
  * of_irq_find_parent - Given a device node, find its interrupt parent node
  * @child: pointer to device node
  *
- * Returns a pointer to the interrupt parent node, or NULL if the interrupt
+ * Return: A pointer to the interrupt parent node, or NULL if the interrupt
  * parent could not be determined.
  */
 struct device_node *of_irq_find_parent(struct device_node *child)
@@ -81,14 +81,14 @@ EXPORT_SYMBOL_GPL(of_irq_find_parent);
  * @addr:	address specifier (start of "reg" property of the device) in be32 format
  * @out_irq:	structure of_phandle_args updated by this function
  *
- * Returns 0 on success and a negative number on error
- *
  * This function is a low-level interrupt tree walking function. It
  * can be used to do a partial walk with synthetized reg and interrupts
  * properties, for example when resolving PCI interrupts when no device
  * node exist for the parent. It takes an interrupt specifier structure as
  * input, walks the tree looking for any interrupt-map properties, translates
  * the specifier for each map, and then returns the translated map.
+ *
+ * Return: 0 on success and a negative number on error
  */
 int of_irq_parse_raw(const __be32 *addr, struct of_phandle_args *out_irq)
 {
@@ -380,7 +380,7 @@ EXPORT_SYMBOL_GPL(of_irq_to_resource);
  * @dev: pointer to device tree node
  * @index: zero-based index of the IRQ
  *
- * Returns Linux IRQ number on success, or 0 on the IRQ mapping failure, or
+ * Return: Linux IRQ number on success, or 0 on the IRQ mapping failure, or
  * -EPROBE_DEFER if the IRQ domain is not yet created, or error code in case
  * of any other failure.
  */
@@ -407,7 +407,7 @@ EXPORT_SYMBOL_GPL(of_irq_get);
  * @dev: pointer to device tree node
  * @name: IRQ name
  *
- * Returns Linux IRQ number on success, or 0 on the IRQ mapping failure, or
+ * Return: Linux IRQ number on success, or 0 on the IRQ mapping failure, or
  * -EPROBE_DEFER if the IRQ domain is not yet created, or error code in case
  * of any other failure.
  */
@@ -447,7 +447,7 @@ int of_irq_count(struct device_node *dev)
  * @res: array of resources to fill in
  * @nr_irqs: the number of IRQs (and upper bound for num of @res elements)
  *
- * Returns the size of the filled in table (up to @nr_irqs).
+ * Return: The size of the filled in table (up to @nr_irqs).
  */
 int of_irq_to_resource_table(struct device_node *dev, struct resource *res,
 		int nr_irqs)
@@ -602,7 +602,7 @@ static u32 __of_msi_map_id(struct device *dev, struct device_node **np,
  * Walk up the device hierarchy looking for devices with a "msi-map"
  * property.  If found, apply the mapping to @id_in.
  *
- * Returns the mapped MSI ID.
+ * Return: The mapped MSI ID.
  */
 u32 of_msi_map_id(struct device *dev, struct device_node *msi_np, u32 id_in)
 {
diff --git a/drivers/of/kexec.c b/drivers/of/kexec.c
new file mode 100644
index 000000000000..f335d941a716
--- /dev/null
+++ b/drivers/of/kexec.c
@@ -0,0 +1,458 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2020 Arm Limited
+ *
+ * Based on arch/arm64/kernel/machine_kexec_file.c:
+ *  Copyright (C) 2018 Linaro Limited
+ *
+ * And arch/powerpc/kexec/file_load.c:
+ *  Copyright (C) 2016  IBM Corporation
+ */
+
+#include <linux/kernel.h>
+#include <linux/kexec.h>
+#include <linux/memblock.h>
+#include <linux/libfdt.h>
+#include <linux/of.h>
+#include <linux/of_fdt.h>
+#include <linux/random.h>
+#include <linux/types.h>
+
+/* relevant device tree properties */
+#define FDT_PROP_KEXEC_ELFHDR	"linux,elfcorehdr"
+#define FDT_PROP_MEM_RANGE	"linux,usable-memory-range"
+#define FDT_PROP_INITRD_START	"linux,initrd-start"
+#define FDT_PROP_INITRD_END	"linux,initrd-end"
+#define FDT_PROP_BOOTARGS	"bootargs"
+#define FDT_PROP_KASLR_SEED	"kaslr-seed"
+#define FDT_PROP_RNG_SEED	"rng-seed"
+#define RNG_SEED_SIZE		128
+
+/*
+ * Additional space needed for the FDT buffer so that we can add initrd,
+ * bootargs, kaslr-seed, rng-seed, useable-memory-range and elfcorehdr.
+ */
+#define FDT_EXTRA_SPACE 0x1000
+
+/**
+ * fdt_find_and_del_mem_rsv - delete memory reservation with given address and size
+ *
+ * @fdt:	Flattened device tree for the current kernel.
+ * @start:	Starting address of the reserved memory.
+ * @size:	Size of the reserved memory.
+ *
+ * Return: 0 on success, or negative errno on error.
+ */
+static int fdt_find_and_del_mem_rsv(void *fdt, unsigned long start, unsigned long size)
+{
+	int i, ret, num_rsvs = fdt_num_mem_rsv(fdt);
+
+	for (i = 0; i < num_rsvs; i++) {
+		u64 rsv_start, rsv_size;
+
+		ret = fdt_get_mem_rsv(fdt, i, &rsv_start, &rsv_size);
+		if (ret) {
+			pr_err("Malformed device tree.\n");
+			return -EINVAL;
+		}
+
+		if (rsv_start == start && rsv_size == size) {
+			ret = fdt_del_mem_rsv(fdt, i);
+			if (ret) {
+				pr_err("Error deleting device tree reservation.\n");
+				return -EINVAL;
+			}
+
+			return 0;
+		}
+	}
+
+	return -ENOENT;
+}
+
+/**
+ * get_addr_size_cells - Get address and size of root node
+ *
+ * @addr_cells: Return address of the root node
+ * @size_cells: Return size of the root node
+ *
+ * Return: 0 on success, or negative errno on error.
+ */
+static int get_addr_size_cells(int *addr_cells, int *size_cells)
+{
+	struct device_node *root;
+
+	root = of_find_node_by_path("/");
+	if (!root)
+		return -EINVAL;
+
+	*addr_cells = of_n_addr_cells(root);
+	*size_cells = of_n_size_cells(root);
+
+	of_node_put(root);
+
+	return 0;
+}
+
+/**
+ * do_get_kexec_buffer - Get address and size of device tree property
+ *
+ * @prop: Device tree property
+ * @len: Size of @prop
+ * @addr: Return address of the node
+ * @size: Return size of the node
+ *
+ * Return: 0 on success, or negative errno on error.
+ */
+static int do_get_kexec_buffer(const void *prop, int len, unsigned long *addr,
+			       size_t *size)
+{
+	int ret, addr_cells, size_cells;
+
+	ret = get_addr_size_cells(&addr_cells, &size_cells);
+	if (ret)
+		return ret;
+
+	if (len < 4 * (addr_cells + size_cells))
+		return -ENOENT;
+
+	*addr = of_read_number(prop, addr_cells);
+	*size = of_read_number(prop + 4 * addr_cells, size_cells);
+
+	return 0;
+}
+
+/**
+ * ima_get_kexec_buffer - get IMA buffer from the previous kernel
+ * @addr:	On successful return, set to point to the buffer contents.
+ * @size:	On successful return, set to the buffer size.
+ *
+ * Return: 0 on success, negative errno on error.
+ */
+int ima_get_kexec_buffer(void **addr, size_t *size)
+{
+	int ret, len;
+	unsigned long tmp_addr;
+	size_t tmp_size;
+	const void *prop;
+
+	if (!IS_ENABLED(CONFIG_HAVE_IMA_KEXEC))
+		return -ENOTSUPP;
+
+	prop = of_get_property(of_chosen, "linux,ima-kexec-buffer", &len);
+	if (!prop)
+		return -ENOENT;
+
+	ret = do_get_kexec_buffer(prop, len, &tmp_addr, &tmp_size);
+	if (ret)
+		return ret;
+
+	*addr = __va(tmp_addr);
+	*size = tmp_size;
+
+	return 0;
+}
+
+/**
+ * ima_free_kexec_buffer - free memory used by the IMA buffer
+ */
+int ima_free_kexec_buffer(void)
+{
+	int ret;
+	unsigned long addr;
+	size_t size;
+	struct property *prop;
+
+	if (!IS_ENABLED(CONFIG_HAVE_IMA_KEXEC))
+		return -ENOTSUPP;
+
+	prop = of_find_property(of_chosen, "linux,ima-kexec-buffer", NULL);
+	if (!prop)
+		return -ENOENT;
+
+	ret = do_get_kexec_buffer(prop->value, prop->length, &addr, &size);
+	if (ret)
+		return ret;
+
+	ret = of_remove_property(of_chosen, prop);
+	if (ret)
+		return ret;
+
+	return memblock_free(addr, size);
+
+}
+
+/**
+ * remove_ima_buffer - remove the IMA buffer property and reservation from @fdt
+ *
+ * @fdt: Flattened Device Tree to update
+ * @chosen_node: Offset to the chosen node in the device tree
+ *
+ * The IMA measurement buffer is of no use to a subsequent kernel, so we always
+ * remove it from the device tree.
+ */
+static void remove_ima_buffer(void *fdt, int chosen_node)
+{
+	int ret, len;
+	unsigned long addr;
+	size_t size;
+	const void *prop;
+
+	if (!IS_ENABLED(CONFIG_HAVE_IMA_KEXEC))
+		return;
+
+	prop = fdt_getprop(fdt, chosen_node, "linux,ima-kexec-buffer", &len);
+	if (!prop)
+		return;
+
+	ret = do_get_kexec_buffer(prop, len, &addr, &size);
+	fdt_delprop(fdt, chosen_node, "linux,ima-kexec-buffer");
+	if (ret)
+		return;
+
+	ret = fdt_find_and_del_mem_rsv(fdt, addr, size);
+	if (!ret)
+		pr_debug("Removed old IMA buffer reservation.\n");
+}
+
+#ifdef CONFIG_IMA_KEXEC
+/**
+ * setup_ima_buffer - add IMA buffer information to the fdt
+ * @image:		kexec image being loaded.
+ * @fdt:		Flattened device tree for the next kernel.
+ * @chosen_node:	Offset to the chosen node.
+ *
+ * Return: 0 on success, or negative errno on error.
+ */
+static int setup_ima_buffer(const struct kimage *image, void *fdt,
+			    int chosen_node)
+{
+	int ret;
+
+	if (!image->ima_buffer_size)
+		return 0;
+
+	ret = fdt_appendprop_addrrange(fdt, 0, chosen_node,
+				       "linux,ima-kexec-buffer",
+				       image->ima_buffer_addr,
+				       image->ima_buffer_size);
+	if (ret < 0)
+		return -EINVAL;
+
+	ret = fdt_add_mem_rsv(fdt, image->ima_buffer_addr,
+			      image->ima_buffer_size);
+	if (ret)
+		return -EINVAL;
+
+	pr_debug("IMA buffer at 0x%llx, size = 0x%zx\n",
+		 image->ima_buffer_addr, image->ima_buffer_size);
+
+	return 0;
+}
+#else /* CONFIG_IMA_KEXEC */
+static inline int setup_ima_buffer(const struct kimage *image, void *fdt,
+				   int chosen_node)
+{
+	return 0;
+}
+#endif /* CONFIG_IMA_KEXEC */
+
+/*
+ * of_kexec_alloc_and_setup_fdt - Alloc and setup a new Flattened Device Tree
+ *
+ * @image:		kexec image being loaded.
+ * @initrd_load_addr:	Address where the next initrd will be loaded.
+ * @initrd_len:		Size of the next initrd, or 0 if there will be none.
+ * @cmdline:		Command line for the next kernel, or NULL if there will
+ *			be none.
+ * @extra_fdt_size:	Additional size for the new FDT buffer.
+ *
+ * Return: fdt on success, or NULL errno on error.
+ */
+void *of_kexec_alloc_and_setup_fdt(const struct kimage *image,
+				   unsigned long initrd_load_addr,
+				   unsigned long initrd_len,
+				   const char *cmdline, size_t extra_fdt_size)
+{
+	void *fdt;
+	int ret, chosen_node;
+	const void *prop;
+	size_t fdt_size;
+
+	fdt_size = fdt_totalsize(initial_boot_params) +
+		   (cmdline ? strlen(cmdline) : 0) +
+		   FDT_EXTRA_SPACE +
+		   extra_fdt_size;
+	fdt = kvmalloc(fdt_size, GFP_KERNEL);
+	if (!fdt)
+		return NULL;
+
+	ret = fdt_open_into(initial_boot_params, fdt, fdt_size);
+	if (ret < 0) {
+		pr_err("Error %d setting up the new device tree.\n", ret);
+		goto out;
+	}
+
+	/* Remove memory reservation for the current device tree. */
+	ret = fdt_find_and_del_mem_rsv(fdt, __pa(initial_boot_params),
+				       fdt_totalsize(initial_boot_params));
+	if (ret == -EINVAL) {
+		pr_err("Error removing memory reservation.\n");
+		goto out;
+	}
+
+	chosen_node = fdt_path_offset(fdt, "/chosen");
+	if (chosen_node == -FDT_ERR_NOTFOUND)
+		chosen_node = fdt_add_subnode(fdt, fdt_path_offset(fdt, "/"),
+					      "chosen");
+	if (chosen_node < 0) {
+		ret = chosen_node;
+		goto out;
+	}
+
+	ret = fdt_delprop(fdt, chosen_node, FDT_PROP_KEXEC_ELFHDR);
+	if (ret && ret != -FDT_ERR_NOTFOUND)
+		goto out;
+	ret = fdt_delprop(fdt, chosen_node, FDT_PROP_MEM_RANGE);
+	if (ret && ret != -FDT_ERR_NOTFOUND)
+		goto out;
+
+	/* Did we boot using an initrd? */
+	prop = fdt_getprop(fdt, chosen_node, "linux,initrd-start", NULL);
+	if (prop) {
+		u64 tmp_start, tmp_end, tmp_size;
+
+		tmp_start = fdt64_to_cpu(*((const fdt64_t *) prop));
+
+		prop = fdt_getprop(fdt, chosen_node, "linux,initrd-end", NULL);
+		if (!prop) {
+			ret = -EINVAL;
+			goto out;
+		}
+
+		tmp_end = fdt64_to_cpu(*((const fdt64_t *) prop));
+
+		/*
+		 * kexec reserves exact initrd size, while firmware may
+		 * reserve a multiple of PAGE_SIZE, so check for both.
+		 */
+		tmp_size = tmp_end - tmp_start;
+		ret = fdt_find_and_del_mem_rsv(fdt, tmp_start, tmp_size);
+		if (ret == -ENOENT)
+			ret = fdt_find_and_del_mem_rsv(fdt, tmp_start,
+						       round_up(tmp_size, PAGE_SIZE));
+		if (ret == -EINVAL)
+			goto out;
+	}
+
+	/* add initrd-* */
+	if (initrd_load_addr) {
+		ret = fdt_setprop_u64(fdt, chosen_node, FDT_PROP_INITRD_START,
+				      initrd_load_addr);
+		if (ret)
+			goto out;
+
+		ret = fdt_setprop_u64(fdt, chosen_node, FDT_PROP_INITRD_END,
+				      initrd_load_addr + initrd_len);
+		if (ret)
+			goto out;
+
+		ret = fdt_add_mem_rsv(fdt, initrd_load_addr, initrd_len);
+		if (ret)
+			goto out;
+
+	} else {
+		ret = fdt_delprop(fdt, chosen_node, FDT_PROP_INITRD_START);
+		if (ret && (ret != -FDT_ERR_NOTFOUND))
+			goto out;
+
+		ret = fdt_delprop(fdt, chosen_node, FDT_PROP_INITRD_END);
+		if (ret && (ret != -FDT_ERR_NOTFOUND))
+			goto out;
+	}
+
+	if (image->type == KEXEC_TYPE_CRASH) {
+		/* add linux,elfcorehdr */
+		ret = fdt_appendprop_addrrange(fdt, 0, chosen_node,
+				FDT_PROP_KEXEC_ELFHDR,
+				image->elf_load_addr,
+				image->elf_headers_sz);
+		if (ret)
+			goto out;
+
+		/*
+		 * Avoid elfcorehdr from being stomped on in kdump kernel by
+		 * setting up memory reserve map.
+		 */
+		ret = fdt_add_mem_rsv(fdt, image->elf_load_addr,
+				      image->elf_headers_sz);
+		if (ret)
+			goto out;
+
+		/* add linux,usable-memory-range */
+		ret = fdt_appendprop_addrrange(fdt, 0, chosen_node,
+				FDT_PROP_MEM_RANGE,
+				crashk_res.start,
+				crashk_res.end - crashk_res.start + 1);
+		if (ret)
+			goto out;
+	}
+
+	/* add bootargs */
+	if (cmdline) {
+		ret = fdt_setprop_string(fdt, chosen_node, FDT_PROP_BOOTARGS, cmdline);
+		if (ret)
+			goto out;
+	} else {
+		ret = fdt_delprop(fdt, chosen_node, FDT_PROP_BOOTARGS);
+		if (ret && (ret != -FDT_ERR_NOTFOUND))
+			goto out;
+	}
+
+	/* add kaslr-seed */
+	ret = fdt_delprop(fdt, chosen_node, FDT_PROP_KASLR_SEED);
+	if (ret == -FDT_ERR_NOTFOUND)
+		ret = 0;
+	else if (ret)
+		goto out;
+
+	if (rng_is_initialized()) {
+		u64 seed = get_random_u64();
+
+		ret = fdt_setprop_u64(fdt, chosen_node, FDT_PROP_KASLR_SEED, seed);
+		if (ret)
+			goto out;
+	} else {
+		pr_notice("RNG is not initialised: omitting \"%s\" property\n",
+				FDT_PROP_KASLR_SEED);
+	}
+
+	/* add rng-seed */
+	if (rng_is_initialized()) {
+		void *rng_seed;
+
+		ret = fdt_setprop_placeholder(fdt, chosen_node, FDT_PROP_RNG_SEED,
+				RNG_SEED_SIZE, &rng_seed);
+		if (ret)
+			goto out;
+		get_random_bytes(rng_seed, RNG_SEED_SIZE);
+	} else {
+		pr_notice("RNG is not initialised: omitting \"%s\" property\n",
+				FDT_PROP_RNG_SEED);
+	}
+
+	ret = fdt_setprop(fdt, chosen_node, "linux,booted-from-kexec", NULL, 0);
+	if (ret)
+		goto out;
+
+	remove_ima_buffer(fdt, chosen_node);
+	ret = setup_ima_buffer(image, fdt, fdt_path_offset(fdt, "/chosen"));
+
+out:
+	if (ret) {
+		kvfree(fdt);
+		fdt = NULL;
+	}
+
+	return fdt;
+}
diff --git a/drivers/of/of_net.c b/drivers/of/of_net.c
index 6e411821583e..bc0a27de69d4 100644
--- a/drivers/of/of_net.c
+++ b/drivers/of/of_net.c
@@ -79,6 +79,9 @@ static const void *of_get_mac_addr_nvmem(struct device_node *np)
 }
 
 /**
+ * of_get_mac_address()
+ * @np:		Caller's Device Node
+ *
  * Search the device tree for the best MAC address to use.  'mac-address' is
  * checked first, because that is supposed to contain to "most recent" MAC
  * address. If that isn't set, then 'local-mac-address' is checked next,
diff --git a/drivers/of/of_reserved_mem.c b/drivers/of/of_reserved_mem.c
index a7fbc5e37e19..15e2417974d6 100644
--- a/drivers/of/of_reserved_mem.c
+++ b/drivers/of/of_reserved_mem.c
@@ -45,7 +45,7 @@ static int __init early_init_dt_alloc_reserved_memory_arch(phys_addr_t size,
 	return memblock_reserve(base, size);
 }
 
-/**
+/*
  * fdt_reserved_mem_save_node() - save fdt node for second pass initialization
  */
 void __init fdt_reserved_mem_save_node(unsigned long node, const char *uname,
@@ -67,7 +67,7 @@ void __init fdt_reserved_mem_save_node(unsigned long node, const char *uname,
 	return;
 }
 
-/**
+/*
  * __reserved_mem_alloc_size() - allocate reserved memory described by
  *	'size', 'alignment'  and 'alloc-ranges' properties.
  */
@@ -164,7 +164,7 @@ static int __init __reserved_mem_alloc_size(unsigned long node,
 static const struct of_device_id __rmem_of_table_sentinel
 	__used __section("__reservedmem_of_table_end");
 
-/**
+/*
  * __reserved_mem_init_node() - call region specific reserved memory init code
  */
 static int __init __reserved_mem_init_node(struct reserved_mem *rmem)
diff --git a/drivers/of/overlay.c b/drivers/of/overlay.c
index 23effe5e50ec..180c6fb3ef36 100644
--- a/drivers/of/overlay.c
+++ b/drivers/of/overlay.c
@@ -140,7 +140,7 @@ int of_overlay_notifier_register(struct notifier_block *nb)
 EXPORT_SYMBOL_GPL(of_overlay_notifier_register);
 
 /**
- * of_overlay_notifier_register() - Unregister notifier for overlay operations
+ * of_overlay_notifier_unregister() - Unregister notifier for overlay operations
  * @nb:		Notifier block to unregister
  */
 int of_overlay_notifier_unregister(struct notifier_block *nb)
@@ -298,7 +298,7 @@ err_free_target_path:
  *
  * Update of property in symbols node is not allowed.
  *
- * Returns 0 on success, -ENOMEM if memory allocation failure, or -EINVAL if
+ * Return: 0 on success, -ENOMEM if memory allocation failure, or -EINVAL if
  * invalid @overlay.
  */
 static int add_changeset_property(struct overlay_changeset *ovcs,
@@ -403,7 +403,7 @@ static int add_changeset_property(struct overlay_changeset *ovcs,
  *
  * NOTE_2: Multiple mods of created nodes not supported.
  *
- * Returns 0 on success, -ENOMEM if memory allocation failure, or -EINVAL if
+ * Return: 0 on success, -ENOMEM if memory allocation failure, or -EINVAL if
  * invalid @overlay.
  */
 static int add_changeset_node(struct overlay_changeset *ovcs,
@@ -475,7 +475,7 @@ static int add_changeset_node(struct overlay_changeset *ovcs,
  *
  * Do not allow symbols node to have any children.
  *
- * Returns 0 on success, -ENOMEM if memory allocation failure, or -EINVAL if
+ * Return: 0 on success, -ENOMEM if memory allocation failure, or -EINVAL if
  * invalid @overlay_node.
  */
 static int build_changeset_next_level(struct overlay_changeset *ovcs,
@@ -606,7 +606,7 @@ static int find_dup_cset_prop(struct overlay_changeset *ovcs,
  * the same node or duplicate {add, delete, or update} properties entries
  * for the same property.
  *
- * Returns 0 on success, or -EINVAL if duplicate changeset entry found.
+ * Return: 0 on success, or -EINVAL if duplicate changeset entry found.
  */
 static int changeset_dup_entry_check(struct overlay_changeset *ovcs)
 {
@@ -630,7 +630,7 @@ static int changeset_dup_entry_check(struct overlay_changeset *ovcs)
  * any portions of the changeset that were successfully created will remain
  * in @ovcs->cset.
  *
- * Returns 0 on success, -ENOMEM if memory allocation failure, or -EINVAL if
+ * Return: 0 on success, -ENOMEM if memory allocation failure, or -EINVAL if
  * invalid overlay in @ovcs->fragments[].
  */
 static int build_changeset(struct overlay_changeset *ovcs)
@@ -726,7 +726,7 @@ static struct device_node *find_target(struct device_node *info_node)
  * the top level of @tree.  The relevant top level nodes are the fragment
  * nodes and the __symbols__ node.  Any other top level node will be ignored.
  *
- * Returns 0 on success, -ENOMEM if memory allocation failure, -EINVAL if error
+ * Return: 0 on success, -ENOMEM if memory allocation failure, -EINVAL if error
  * detected in @tree, or -ENOSPC if idr_alloc() error.
  */
 static int init_overlay_changeset(struct overlay_changeset *ovcs,
@@ -796,6 +796,7 @@ static int init_overlay_changeset(struct overlay_changeset *ovcs,
 		if (!fragment->target) {
 			of_node_put(fragment->overlay);
 			ret = -EINVAL;
+			of_node_put(node);
 			goto err_free_fragments;
 		}
 
@@ -1186,7 +1187,7 @@ static int overlay_removal_is_ok(struct overlay_changeset *remove_ovcs)
  * If an error is returned by an overlay changeset post-remove notifier
  * then no further overlay changeset post-remove notifier will be called.
  *
- * Returns 0 on success, or a negative error number.  *ovcs_id is set to
+ * Return: 0 on success, or a negative error number.  *@ovcs_id is set to
  * zero after reverting the changeset, even if a subsequent error occurs.
  */
 int of_overlay_remove(int *ovcs_id)
@@ -1264,7 +1265,7 @@ EXPORT_SYMBOL_GPL(of_overlay_remove);
  *
  * Removes all overlays from the system in the correct order.
  *
- * Returns 0 on success, or a negative error number
+ * Return: 0 on success, or a negative error number
  */
 int of_overlay_remove_all(void)
 {
diff --git a/drivers/of/platform.c b/drivers/of/platform.c
index 0da86209ddaa..25d448f5af91 100644
--- a/drivers/of/platform.c
+++ b/drivers/of/platform.c
@@ -44,7 +44,7 @@ static const struct of_device_id of_skipped_node_table[] = {
  * Takes a reference to the embedded struct device which needs to be dropped
  * after use.
  *
- * Returns platform_device pointer, or NULL if not found
+ * Return: platform_device pointer, or NULL if not found
  */
 struct platform_device *of_find_device_by_node(struct device_node *np)
 {
@@ -160,7 +160,7 @@ EXPORT_SYMBOL(of_device_alloc);
  * @platform_data: pointer to populate platform_data pointer with
  * @parent: Linux device model parent device.
  *
- * Returns pointer to created platform device, or NULL if a device was not
+ * Return: Pointer to created platform device, or NULL if a device was not
  * registered.  Unavailable devices will not get registered.
  */
 static struct platform_device *of_platform_device_create_pdata(
@@ -204,7 +204,7 @@ err_clear_flag:
  * @bus_id: name to assign device
  * @parent: Linux device model parent device.
  *
- * Returns pointer to created platform device, or NULL if a device was not
+ * Return: Pointer to created platform device, or NULL if a device was not
  * registered.  Unavailable devices will not get registered.
  */
 struct platform_device *of_platform_device_create(struct device_node *np,
@@ -290,7 +290,7 @@ static struct amba_device *of_amba_device_create(struct device_node *node,
 }
 #endif /* CONFIG_ARM_AMBA */
 
-/**
+/*
  * of_dev_lookup() - Given a device node, lookup the preferred Linux name
  */
 static const struct of_dev_auxdata *of_dev_lookup(const struct of_dev_auxdata *lookup,
@@ -463,7 +463,7 @@ EXPORT_SYMBOL(of_platform_bus_probe);
  * New board support should be using this function instead of
  * of_platform_bus_probe().
  *
- * Returns 0 on success, < 0 on failure.
+ * Return: 0 on success, < 0 on failure.
  */
 int of_platform_populate(struct device_node *root,
 			const struct of_device_id *matches,
@@ -607,7 +607,7 @@ static void devm_of_platform_populate_release(struct device *dev, void *res)
  * Similar to of_platform_populate(), but will automatically call
  * of_platform_depopulate() when the device is unbound from the bus.
  *
- * Returns 0 on success, < 0 on failure.
+ * Return: 0 on success, < 0 on failure.
  */
 int devm_of_platform_populate(struct device *dev)
 {
diff --git a/drivers/of/property.c b/drivers/of/property.c
index aab6383f0219..6c028632f425 100644
--- a/drivers/of/property.c
+++ b/drivers/of/property.c
@@ -61,9 +61,11 @@ EXPORT_SYMBOL(of_graph_is_present);
  * @elem_size:	size of the individual element
  *
  * Search for a property in a device node and count the number of elements of
- * size elem_size in it. Returns number of elements on sucess, -EINVAL if the
- * property does not exist or its length does not match a multiple of elem_size
- * and -ENODATA if the property does not have a value.
+ * size elem_size in it.
+ *
+ * Return: The number of elements on sucess, -EINVAL if the property does not
+ * exist or its length does not match a multiple of elem_size and -ENODATA if
+ * the property does not have a value.
  */
 int of_property_count_elems_of_size(const struct device_node *np,
 				const char *propname, int elem_size)
@@ -95,8 +97,9 @@ EXPORT_SYMBOL_GPL(of_property_count_elems_of_size);
  * @len:	if !=NULL, actual length is written to here
  *
  * 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
+ *
+ * Return: 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 is too small or too large.
  *
  */
@@ -129,7 +132,9 @@ static void *of_find_property_value_of_size(const struct device_node *np,
  * @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,
+ * it.
+ *
+ * Return: 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.
  *
@@ -161,7 +166,9 @@ EXPORT_SYMBOL_GPL(of_property_read_u32_index);
  * @out_value:	pointer to return value, modified only if no error.
  *
  * Search for a property in a device node and read nth 64-bit value from
- * it. Returns 0 on success, -EINVAL if the property does not exist,
+ * it.
+ *
+ * Return: 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.
  *
@@ -196,12 +203,14 @@ EXPORT_SYMBOL_GPL(of_property_read_u64_index);
  *		sz_min will be read.
  *
  * Search for a property in a device node and read 8-bit value(s) from
- * it. Returns number of elements read on success, -EINVAL if the property
- * does not exist, -ENODATA if property does not have a value, and -EOVERFLOW
- * if the property data is smaller than sz_min or longer than sz_max.
+ * it.
  *
  * dts entry of array should be like:
- *	property = /bits/ 8 <0x50 0x60 0x70>;
+ *  ``property = /bits/ 8 <0x50 0x60 0x70>;``
+ *
+ * Return: The number of elements read on success, -EINVAL if the property
+ * does not exist, -ENODATA if property does not have a value, and -EOVERFLOW
+ * if the property data is smaller than sz_min or longer than sz_max.
  *
  * The out_values is modified only if a valid u8 value can be decoded.
  */
@@ -244,12 +253,14 @@ EXPORT_SYMBOL_GPL(of_property_read_variable_u8_array);
  *		sz_min will be read.
  *
  * Search for a property in a device node and read 16-bit value(s) from
- * it. Returns number of elements read on success, -EINVAL if the property
- * does not exist, -ENODATA if property does not have a value, and -EOVERFLOW
- * if the property data is smaller than sz_min or longer than sz_max.
+ * it.
  *
  * dts entry of array should be like:
- *	property = /bits/ 16 <0x5000 0x6000 0x7000>;
+ *  ``property = /bits/ 16 <0x5000 0x6000 0x7000>;``
+ *
+ * Return: The number of elements read on success, -EINVAL if the property
+ * does not exist, -ENODATA if property does not have a value, and -EOVERFLOW
+ * if the property data is smaller than sz_min or longer than sz_max.
  *
  * The out_values is modified only if a valid u16 value can be decoded.
  */
@@ -292,7 +303,9 @@ EXPORT_SYMBOL_GPL(of_property_read_variable_u16_array);
  *		sz_min will be read.
  *
  * Search for a property in a device node and read 32-bit value(s) from
- * it. Returns number of elements read on success, -EINVAL if the property
+ * it.
+ *
+ * Return: The number of elements read on success, -EINVAL if the property
  * does not exist, -ENODATA if property does not have a value, and -EOVERFLOW
  * if the property data is smaller than sz_min or longer than sz_max.
  *
@@ -331,7 +344,9 @@ EXPORT_SYMBOL_GPL(of_property_read_variable_u32_array);
  * @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,
+ * it.
+ *
+ * Return: 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.
  *
@@ -366,7 +381,9 @@ EXPORT_SYMBOL_GPL(of_property_read_u64);
  *		sz_min will be read.
  *
  * Search for a property in a device node and read 64-bit value(s) from
- * it. Returns number of elements read on success, -EINVAL if the property
+ * it.
+ *
+ * Return: The number of elements read on success, -EINVAL if the property
  * does not exist, -ENODATA if property does not have a value, and -EOVERFLOW
  * if the property data is smaller than sz_min or longer than sz_max.
  *
@@ -408,10 +425,11 @@ EXPORT_SYMBOL_GPL(of_property_read_variable_u64_array);
  *		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.
+ * terminated string value (pointer to data, not a copy).
+ *
+ * Return: 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.
  */
@@ -775,7 +793,7 @@ EXPORT_SYMBOL(of_graph_get_remote_port_parent);
  * @node: pointer to a local endpoint device_node
  *
  * Return: Remote port node associated with remote endpoint node linked
- *	   to @node. Use of_node_put() on it when done.
+ * to @node. Use of_node_put() on it when done.
  */
 struct device_node *of_graph_get_remote_port(const struct device_node *node)
 {
@@ -808,7 +826,7 @@ EXPORT_SYMBOL(of_graph_get_endpoint_count);
  * @endpoint: identifier (value of reg property) of the endpoint node
  *
  * Return: Remote device node associated with remote endpoint node linked
- *	   to @node. Use of_node_put() on it when done.
+ * to @node. Use of_node_put() on it when done.
  */
 struct device_node *of_graph_get_remote_node(const struct device_node *node,
 					     u32 port, u32 endpoint)
@@ -1230,7 +1248,7 @@ static struct device_node *parse_##fname(struct device_node *np,	     \
  * @parse_prop.prop_name: Name of property holding a phandle value
  * @parse_prop.index: For properties holding a list of phandles, this is the
  *		      index into the list
- * @optional: The property can be an optional dependency.
+ * @optional: Describes whether a supplier is mandatory or not
  * @node_not_dev: The consumer node containing the property is never a device.
  *
  * Returns:
@@ -1363,7 +1381,6 @@ static const struct supplier_bindings of_supplier_bindings[] = {
 
 /**
  * of_link_property - Create device links to suppliers listed in a property
- * @dev: Consumer device
  * @con_np: The consumer device tree node which contains the property
  * @prop_name: Name of property to be parsed
  *
@@ -1387,7 +1404,6 @@ static int of_link_property(struct device_node *con_np, const char *prop_name)
 	const struct supplier_bindings *s = of_supplier_bindings;
 	unsigned int i = 0;
 	bool matched = false;
-	int ret = 0;
 
 	/* Do not stop at first failed link, link all available suppliers. */
 	while (!matched && s->parse_prop) {
@@ -1410,7 +1426,7 @@ static int of_link_property(struct device_node *con_np, const char *prop_name)
 		}
 		s++;
 	}
-	return ret;
+	return 0;
 }
 
 static int of_fwnode_add_links(struct fwnode_handle *fwnode)
diff --git a/drivers/of/unittest-data/Makefile b/drivers/of/unittest-data/Makefile
index 009f4045c8e4..a5d2d9254b2c 100644
--- a/drivers/of/unittest-data/Makefile
+++ b/drivers/of/unittest-data/Makefile
@@ -38,3 +38,51 @@ DTC_FLAGS_testcases += -@
 
 # suppress warnings about intentional errors
 DTC_FLAGS_testcases += -Wno-interrupts_property
+
+# Apply overlays statically with fdtoverlay.  This is a build time test that
+# the overlays can be applied successfully by fdtoverlay.  This does not
+# guarantee that the overlays can be applied successfully at run time by
+# unittest, but it provides a bit of build time test coverage for those
+# who do not execute unittest.
+#
+# The overlays are applied on top of static_base_1.dtb and static_base_2.dtb to
+# create static_test_1.dtb and static_test_2.dtb.  If fdtoverlay detects an
+# error than the kernel build will fail.  static_test_1.dtb and
+# static_test_2.dtb are not consumed by unittest.
+#
+# Some unittest overlays deliberately contain errors that unittest checks for.
+# These overlays will cause fdtoverlay to fail, and are thus not included
+# in the static test:
+#			  overlay_bad_add_dup_node.dtbo \
+#			  overlay_bad_add_dup_prop.dtbo \
+#			  overlay_bad_phandle.dtbo \
+#			  overlay_bad_symbol.dtbo \
+
+apply_static_overlay_1 := overlay_0.dtbo \
+			  overlay_1.dtbo \
+			  overlay_2.dtbo \
+			  overlay_3.dtbo \
+			  overlay_4.dtbo \
+			  overlay_5.dtbo \
+			  overlay_6.dtbo \
+			  overlay_7.dtbo \
+			  overlay_8.dtbo \
+			  overlay_9.dtbo \
+			  overlay_10.dtbo \
+			  overlay_11.dtbo \
+			  overlay_12.dtbo \
+			  overlay_13.dtbo \
+			  overlay_15.dtbo \
+			  overlay_gpio_01.dtbo \
+			  overlay_gpio_02a.dtbo \
+			  overlay_gpio_02b.dtbo \
+			  overlay_gpio_03.dtbo \
+			  overlay_gpio_04a.dtbo \
+			  overlay_gpio_04b.dtbo
+
+apply_static_overlay_2 := overlay.dtbo
+
+static_test_1-dtbs := static_base_1.dtb $(apply_static_overlay_1)
+static_test_2-dtbs := static_base_2.dtb $(apply_static_overlay_2)
+
+dtb-$(CONFIG_OF_OVERLAY) += static_test_1.dtb static_test_2.dtb
diff --git a/drivers/of/unittest-data/overlay_base.dts b/drivers/of/unittest-data/overlay_base.dts
index 99ab9d12d00b..ab9014589c5d 100644
--- a/drivers/of/unittest-data/overlay_base.dts
+++ b/drivers/of/unittest-data/overlay_base.dts
@@ -2,92 +2,4 @@
 /dts-v1/;
 /plugin/;
 
-/*
- * Base device tree that overlays will be applied against.
- *
- * Do not add any properties in node "/".
- * Do not add any nodes other than "/testcase-data-2" in node "/".
- * Do not add anything that would result in dtc creating node "/__fixups__".
- * dtc will create nodes "/__symbols__" and "/__local_fixups__".
- */
-
-/ {
-	testcase-data-2 {
-		#address-cells = <1>;
-		#size-cells = <1>;
-
-		electric_1: substation@100 {
-			compatible = "ot,big-volts-control";
-			reg = < 0x00000100 0x100 >;
-			status = "disabled";
-
-			hvac_1: hvac-medium-1 {
-				compatible = "ot,hvac-medium";
-				heat-range = < 50 75 >;
-				cool-range = < 60 80 >;
-			};
-
-			spin_ctrl_1: motor-1 {
-				compatible = "ot,ferris-wheel-motor";
-				spin = "clockwise";
-				rpm_avail = < 50 >;
-			};
-
-			spin_ctrl_2: motor-8 {
-				compatible = "ot,roller-coaster-motor";
-			};
-		};
-
-		rides_1: fairway-1 {
-			#address-cells = <1>;
-			#size-cells = <1>;
-			compatible = "ot,rides";
-			status = "disabled";
-			orientation = < 127 >;
-
-			ride@100 {
-				#address-cells = <1>;
-				#size-cells = <1>;
-				compatible = "ot,roller-coaster";
-				reg = < 0x00000100 0x100 >;
-				hvac-provider = < &hvac_1 >;
-				hvac-thermostat = < 29 > ;
-				hvac-zones = < 14 >;
-				hvac-zone-names = "operator";
-				spin-controller = < &spin_ctrl_2 5 &spin_ctrl_2 7 >;
-				spin-controller-names = "track_1", "track_2";
-				queues = < 2 >;
-
-				track@30 {
-					reg = < 0x00000030 0x10 >;
-				};
-
-				track@40 {
-					reg = < 0x00000040 0x10 >;
-				};
-
-			};
-		};
-
-		lights_1: lights@30000 {
-			compatible = "ot,work-lights";
-			reg = < 0x00030000 0x1000 >;
-			status = "disabled";
-		};
-
-		lights_2: lights@40000 {
-			compatible = "ot,show-lights";
-			reg = < 0x00040000 0x1000 >;
-			status = "disabled";
-			rate = < 13 138 >;
-		};
-
-		retail_1: vending@50000 {
-			reg = < 0x00050000 0x1000 >;
-			compatible = "ot,tickets";
-			status = "disabled";
-		};
-
-	};
-};
-
+#include "overlay_common.dtsi"
diff --git a/drivers/of/unittest-data/overlay_common.dtsi b/drivers/of/unittest-data/overlay_common.dtsi
new file mode 100644
index 000000000000..08874a72556e
--- /dev/null
+++ b/drivers/of/unittest-data/overlay_common.dtsi
@@ -0,0 +1,91 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/*
+ * Base device tree that overlays will be applied against.
+ *
+ * Do not add any properties in node "/".
+ * Do not add any nodes other than "/testcase-data-2" in node "/".
+ * Do not add anything that would result in dtc creating node "/__fixups__".
+ * dtc will create nodes "/__symbols__" and "/__local_fixups__".
+ */
+
+/ {
+	testcase-data-2 {
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		electric_1: substation@100 {
+			compatible = "ot,big-volts-control";
+			reg = < 0x00000100 0x100 >;
+			status = "disabled";
+
+			hvac_1: hvac-medium-1 {
+				compatible = "ot,hvac-medium";
+				heat-range = < 50 75 >;
+				cool-range = < 60 80 >;
+			};
+
+			spin_ctrl_1: motor-1 {
+				compatible = "ot,ferris-wheel-motor";
+				spin = "clockwise";
+				rpm_avail = < 50 >;
+			};
+
+			spin_ctrl_2: motor-8 {
+				compatible = "ot,roller-coaster-motor";
+			};
+		};
+
+		rides_1: fairway-1 {
+			#address-cells = <1>;
+			#size-cells = <1>;
+			compatible = "ot,rides";
+			status = "disabled";
+			orientation = < 127 >;
+
+			ride@100 {
+				#address-cells = <1>;
+				#size-cells = <1>;
+				compatible = "ot,roller-coaster";
+				reg = < 0x00000100 0x100 >;
+				hvac-provider = < &hvac_1 >;
+				hvac-thermostat = < 29 > ;
+				hvac-zones = < 14 >;
+				hvac-zone-names = "operator";
+				spin-controller = < &spin_ctrl_2 5 &spin_ctrl_2 7 >;
+				spin-controller-names = "track_1", "track_2";
+				queues = < 2 >;
+
+				track@30 {
+					reg = < 0x00000030 0x10 >;
+				};
+
+				track@40 {
+					reg = < 0x00000040 0x10 >;
+				};
+
+			};
+		};
+
+		lights_1: lights@30000 {
+			compatible = "ot,work-lights";
+			reg = < 0x00030000 0x1000 >;
+			status = "disabled";
+		};
+
+		lights_2: lights@40000 {
+			compatible = "ot,show-lights";
+			reg = < 0x00040000 0x1000 >;
+			status = "disabled";
+			rate = < 13 138 >;
+		};
+
+		retail_1: vending@50000 {
+			reg = < 0x00050000 0x1000 >;
+			compatible = "ot,tickets";
+			status = "disabled";
+		};
+
+	};
+};
+
diff --git a/drivers/of/unittest-data/static_base_1.dts b/drivers/of/unittest-data/static_base_1.dts
new file mode 100644
index 000000000000..10556cb3f01f
--- /dev/null
+++ b/drivers/of/unittest-data/static_base_1.dts
@@ -0,0 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+
+#include "testcases_common.dtsi"
diff --git a/drivers/of/unittest-data/static_base_2.dts b/drivers/of/unittest-data/static_base_2.dts
new file mode 100644
index 000000000000..b0ea9504d6f3
--- /dev/null
+++ b/drivers/of/unittest-data/static_base_2.dts
@@ -0,0 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+
+#include "overlay_common.dtsi"
diff --git a/drivers/of/unittest-data/testcases.dts b/drivers/of/unittest-data/testcases.dts
index a85b5e1c381a..61cdd3d5fccb 100644
--- a/drivers/of/unittest-data/testcases.dts
+++ b/drivers/of/unittest-data/testcases.dts
@@ -2,19 +2,20 @@
 /dts-v1/;
 /plugin/;
 
+#include "testcases_common.dtsi"
+
 / {
+	/*
+	 * testcase data that intentionally results in an error is located here
+	 * instead of in testcases_common.dtsi so that the static overlay apply
+	 * tests will not include the error.
+	 */
 	testcase-data {
-		changeset {
-			prop-update = "hello";
-			prop-remove = "world";
-			node-remove {
-			};
+		testcase-device2 {
+			compatible = "testcase-device";
+			interrupt-parent = <&test_intc2>;
+			interrupts = <1>; /* invalid specifier - too short */
 		};
 	};
+
 };
-#include "tests-phandle.dtsi"
-#include "tests-interrupts.dtsi"
-#include "tests-match.dtsi"
-#include "tests-address.dtsi"
-#include "tests-platform.dtsi"
-#include "tests-overlay.dtsi"
diff --git a/drivers/of/unittest-data/testcases_common.dtsi b/drivers/of/unittest-data/testcases_common.dtsi
new file mode 100644
index 000000000000..19292bbb4cbb
--- /dev/null
+++ b/drivers/of/unittest-data/testcases_common.dtsi
@@ -0,0 +1,19 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/ {
+	testcase-data {
+		changeset {
+			prop-update = "hello";
+			prop-remove = "world";
+			node-remove {
+			};
+		};
+	};
+};
+
+#include "tests-phandle.dtsi"
+#include "tests-interrupts.dtsi"
+#include "tests-match.dtsi"
+#include "tests-address.dtsi"
+#include "tests-platform.dtsi"
+#include "tests-overlay.dtsi"
diff --git a/drivers/of/unittest-data/tests-interrupts.dtsi b/drivers/of/unittest-data/tests-interrupts.dtsi
index ec175e800725..9b60a549f502 100644
--- a/drivers/of/unittest-data/tests-interrupts.dtsi
+++ b/drivers/of/unittest-data/tests-interrupts.dtsi
@@ -62,11 +62,10 @@
 			interrupts = <1>;
 		};
 
-		testcase-device2 {
-			compatible = "testcase-device";
-			interrupt-parent = <&test_intc2>;
-			interrupts = <1>; /* invalid specifier - too short */
-		};
+		/*
+		 * testcase data that intentionally results in an error is
+		 * located in testcases.dts instead of in this file so that the
+		 * static overlay apply tests will not include the error.
+		 */
 	};
-
 };