Merge tag 'devprop-4.21-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull device properties framework updates from Rafael Wysocki:
 "This introduces 'software nodes' that are analogous to the DT and ACPI
  firmware nodes except that they can be created by drivers themselves
  and do a couple of assorted cleanups.

  Specifics:

   - Introduce "software nodes", analogous to the DT and ACPI firmware
     nodes except that they can be created by kernel code, in order to
     complement fwnodes representing real firmware nodes when they are
     incomplete (for example missing device properties) and to supply
     the primary fwnode when the firmware lacks hardware description for
     a device completely, and replace the "property_set" struct
     fwnode_handle type with software nodes (Heikki Krogerus).

   - Clean up the just introduced software nodes support and fix a
     commet in the graph-handling code (Colin Ian King, Marco Felsch)"

* tag 'devprop-4.21-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  device property: fix fwnode_graph_get_next_endpoint() documentation
  drivers: base: swnode: remove need for a temporary string for the node name
  device property: Remove struct property_set
  device property: Move device_add_properties() to swnode.c
  drivers: base: Introducing software nodes to the firmware node framework
  ACPI / glue: Add acpi_platform_notify() function
  drivers core: Prepare support for multiple platform notifications
  driver core: platform: Remove duplicated device_remove_properties() call

5 files changed, 721 insertions, 504 deletions

diff --git a/drivers/base/Makefile b/drivers/base/Makefile
index 704f44295810..157452080f3d 100644
--- a/drivers/base/Makefile
+++ b/drivers/base/Makefile
@@ -6,7 +6,7 @@ obj-y			:= component.o core.o bus.o dd.o syscore.o \
 			   cpu.o firmware.o init.o map.o devres.o \
 			   attribute_container.o transport_class.o \
 			   topology.o container.o property.o cacheinfo.o \
-			   devcon.o
+			   devcon.o swnode.o
 obj-$(CONFIG_DEVTMPFS)	+= devtmpfs.o
 obj-y			+= power/
 obj-$(CONFIG_ISA_BUS_API)	+= isa.o
diff --git a/drivers/base/core.c b/drivers/base/core.c
index 04bbcd779e11..a2f14098663f 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -8,6 +8,7 @@
  * Copyright (c) 2006 Novell, Inc.
  */
 
+#include <linux/acpi.h>
 #include <linux/device.h>
 #include <linux/err.h>
 #include <linux/fwnode.h>
@@ -728,6 +729,26 @@ static inline int device_is_not_partition(struct device *dev)
 }
 #endif
 
+static int
+device_platform_notify(struct device *dev, enum kobject_action action)
+{
+	int ret;
+
+	ret = acpi_platform_notify(dev, action);
+	if (ret)
+		return ret;
+
+	ret = software_node_notify(dev, action);
+	if (ret)
+		return ret;
+
+	if (platform_notify && action == KOBJ_ADD)
+		platform_notify(dev);
+	else if (platform_notify_remove && action == KOBJ_REMOVE)
+		platform_notify_remove(dev);
+	return 0;
+}
+
 /**
  * dev_driver_string - Return a device's driver name, if at all possible
  * @dev: struct device to get the name of
@@ -1883,8 +1904,9 @@ int device_add(struct device *dev)
 	}
 
 	/* notify platform of device entry */
-	if (platform_notify)
-		platform_notify(dev);
+	error = device_platform_notify(dev, KOBJ_ADD);
+	if (error)
+		goto platform_error;
 
 	error = device_create_file(dev, &dev_attr_uevent);
 	if (error)
@@ -1960,6 +1982,8 @@ done:
  SymlinkError:
 	device_remove_file(dev, &dev_attr_uevent);
  attrError:
+	device_platform_notify(dev, KOBJ_REMOVE);
+platform_error:
 	kobject_uevent(&dev->kobj, KOBJ_REMOVE);
 	glue_dir = get_glue_dir(dev);
 	kobject_del(&dev->kobj);
@@ -2077,14 +2101,10 @@ void device_del(struct device *dev)
 	bus_remove_device(dev);
 	device_pm_remove(dev);
 	driver_deferred_probe_del(dev);
+	device_platform_notify(dev, KOBJ_REMOVE);
 	device_remove_properties(dev);
 	device_links_purge(dev);
 
-	/* Notify the platform of the removal, in case they
-	 * need to do anything...
-	 */
-	if (platform_notify_remove)
-		platform_notify_remove(dev);
 	if (dev->bus)
 		blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
 					     BUS_NOTIFY_REMOVED_DEVICE, dev);
diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index 41b91af95afb..0fb5f140f1b0 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -448,7 +448,6 @@ void platform_device_del(struct platform_device *pdev)
 	int i;
 
 	if (pdev) {
-		device_remove_properties(&pdev->dev);
 		device_del(&pdev->dev);
 
 		if (pdev->id_auto) {
diff --git a/drivers/base/property.c b/drivers/base/property.c
index 240ab5230ff6..8b91ab380d14 100644
--- a/drivers/base/property.c
+++ b/drivers/base/property.c
@@ -18,236 +18,6 @@
 #include <linux/etherdevice.h>
 #include <linux/phy.h>
 
-struct property_set {
-	struct device *dev;
-	struct fwnode_handle fwnode;
-	const struct property_entry *properties;
-};
-
-static const struct fwnode_operations pset_fwnode_ops;
-
-static inline bool is_pset_node(const struct fwnode_handle *fwnode)
-{
-	return !IS_ERR_OR_NULL(fwnode) && fwnode->ops == &pset_fwnode_ops;
-}
-
-#define to_pset_node(__fwnode)						\
-	({								\
-		typeof(__fwnode) __to_pset_node_fwnode = __fwnode;	\
-									\
-		is_pset_node(__to_pset_node_fwnode) ?			\
-			container_of(__to_pset_node_fwnode,		\
-				     struct property_set, fwnode) :	\
-			NULL;						\
-	})
-
-static const struct property_entry *
-pset_prop_get(const struct property_set *pset, const char *name)
-{
-	const struct property_entry *prop;
-
-	if (!pset || !pset->properties)
-		return NULL;
-
-	for (prop = pset->properties; prop->name; prop++)
-		if (!strcmp(name, prop->name))
-			return prop;
-
-	return NULL;
-}
-
-static const void *property_get_pointer(const struct property_entry *prop)
-{
-	switch (prop->type) {
-	case DEV_PROP_U8:
-		if (prop->is_array)
-			return prop->pointer.u8_data;
-		return &prop->value.u8_data;
-	case DEV_PROP_U16:
-		if (prop->is_array)
-			return prop->pointer.u16_data;
-		return &prop->value.u16_data;
-	case DEV_PROP_U32:
-		if (prop->is_array)
-			return prop->pointer.u32_data;
-		return &prop->value.u32_data;
-	case DEV_PROP_U64:
-		if (prop->is_array)
-			return prop->pointer.u64_data;
-		return &prop->value.u64_data;
-	case DEV_PROP_STRING:
-		if (prop->is_array)
-			return prop->pointer.str;
-		return &prop->value.str;
-	default:
-		return NULL;
-	}
-}
-
-static void property_set_pointer(struct property_entry *prop, const void *pointer)
-{
-	switch (prop->type) {
-	case DEV_PROP_U8:
-		if (prop->is_array)
-			prop->pointer.u8_data = pointer;
-		else
-			prop->value.u8_data = *((u8 *)pointer);
-		break;
-	case DEV_PROP_U16:
-		if (prop->is_array)
-			prop->pointer.u16_data = pointer;
-		else
-			prop->value.u16_data = *((u16 *)pointer);
-		break;
-	case DEV_PROP_U32:
-		if (prop->is_array)
-			prop->pointer.u32_data = pointer;
-		else
-			prop->value.u32_data = *((u32 *)pointer);
-		break;
-	case DEV_PROP_U64:
-		if (prop->is_array)
-			prop->pointer.u64_data = pointer;
-		else
-			prop->value.u64_data = *((u64 *)pointer);
-		break;
-	case DEV_PROP_STRING:
-		if (prop->is_array)
-			prop->pointer.str = pointer;
-		else
-			prop->value.str = pointer;
-		break;
-	default:
-		break;
-	}
-}
-
-static const void *pset_prop_find(const struct property_set *pset,
-				  const char *propname, size_t length)
-{
-	const struct property_entry *prop;
-	const void *pointer;
-
-	prop = pset_prop_get(pset, propname);
-	if (!prop)
-		return ERR_PTR(-EINVAL);
-	pointer = property_get_pointer(prop);
-	if (!pointer)
-		return ERR_PTR(-ENODATA);
-	if (length > prop->length)
-		return ERR_PTR(-EOVERFLOW);
-	return pointer;
-}
-
-static int pset_prop_read_u8_array(const struct property_set *pset,
-				   const char *propname,
-				   u8 *values, size_t nval)
-{
-	const void *pointer;
-	size_t length = nval * sizeof(*values);
-
-	pointer = pset_prop_find(pset, propname, length);
-	if (IS_ERR(pointer))
-		return PTR_ERR(pointer);
-
-	memcpy(values, pointer, length);
-	return 0;
-}
-
-static int pset_prop_read_u16_array(const struct property_set *pset,
-				    const char *propname,
-				    u16 *values, size_t nval)
-{
-	const void *pointer;
-	size_t length = nval * sizeof(*values);
-
-	pointer = pset_prop_find(pset, propname, length);
-	if (IS_ERR(pointer))
-		return PTR_ERR(pointer);
-
-	memcpy(values, pointer, length);
-	return 0;
-}
-
-static int pset_prop_read_u32_array(const struct property_set *pset,
-				    const char *propname,
-				    u32 *values, size_t nval)
-{
-	const void *pointer;
-	size_t length = nval * sizeof(*values);
-
-	pointer = pset_prop_find(pset, propname, length);
-	if (IS_ERR(pointer))
-		return PTR_ERR(pointer);
-
-	memcpy(values, pointer, length);
-	return 0;
-}
-
-static int pset_prop_read_u64_array(const struct property_set *pset,
-				    const char *propname,
-				    u64 *values, size_t nval)
-{
-	const void *pointer;
-	size_t length = nval * sizeof(*values);
-
-	pointer = pset_prop_find(pset, propname, length);
-	if (IS_ERR(pointer))
-		return PTR_ERR(pointer);
-
-	memcpy(values, pointer, length);
-	return 0;
-}
-
-static int pset_prop_count_elems_of_size(const struct property_set *pset,
-					 const char *propname, size_t length)
-{
-	const struct property_entry *prop;
-
-	prop = pset_prop_get(pset, propname);
-	if (!prop)
-		return -EINVAL;
-
-	return prop->length / length;
-}
-
-static int pset_prop_read_string_array(const struct property_set *pset,
-				       const char *propname,
-				       const char **strings, size_t nval)
-{
-	const struct property_entry *prop;
-	const void *pointer;
-	size_t array_len, length;
-
-	/* Find out the array length. */
-	prop = pset_prop_get(pset, propname);
-	if (!prop)
-		return -EINVAL;
-
-	if (!prop->is_array)
-		/* The array length for a non-array string property is 1. */
-		array_len = 1;
-	else
-		/* Find the length of an array. */
-		array_len = pset_prop_count_elems_of_size(pset, propname,
-							  sizeof(const char *));
-
-	/* Return how many there are if strings is NULL. */
-	if (!strings)
-		return array_len;
-
-	array_len = min(nval, array_len);
-	length = array_len * sizeof(*strings);
-
-	pointer = pset_prop_find(pset, propname, length);
-	if (IS_ERR(pointer))
-		return PTR_ERR(pointer);
-
-	memcpy(strings, pointer, length);
-
-	return array_len;
-}
-
 struct fwnode_handle *dev_fwnode(struct device *dev)
 {
 	return IS_ENABLED(CONFIG_OF) && dev->of_node ?
@@ -255,51 +25,6 @@ struct fwnode_handle *dev_fwnode(struct device *dev)
 }
 EXPORT_SYMBOL_GPL(dev_fwnode);
 
-static bool pset_fwnode_property_present(const struct fwnode_handle *fwnode,
-					 const char *propname)
-{
-	return !!pset_prop_get(to_pset_node(fwnode), propname);
-}
-
-static int pset_fwnode_read_int_array(const struct fwnode_handle *fwnode,
-				      const char *propname,
-				      unsigned int elem_size, void *val,
-				      size_t nval)
-{
-	const struct property_set *node = to_pset_node(fwnode);
-
-	if (!val)
-		return pset_prop_count_elems_of_size(node, propname, elem_size);
-
-	switch (elem_size) {
-	case sizeof(u8):
-		return pset_prop_read_u8_array(node, propname, val, nval);
-	case sizeof(u16):
-		return pset_prop_read_u16_array(node, propname, val, nval);
-	case sizeof(u32):
-		return pset_prop_read_u32_array(node, propname, val, nval);
-	case sizeof(u64):
-		return pset_prop_read_u64_array(node, propname, val, nval);
-	}
-
-	return -ENXIO;
-}
-
-static int
-pset_fwnode_property_read_string_array(const struct fwnode_handle *fwnode,
-				       const char *propname,
-				       const char **val, size_t nval)
-{
-	return pset_prop_read_string_array(to_pset_node(fwnode), propname,
-					   val, nval);
-}
-
-static const struct fwnode_operations pset_fwnode_ops = {
-	.property_present = pset_fwnode_property_present,
-	.property_read_int_array = pset_fwnode_read_int_array,
-	.property_read_string_array = pset_fwnode_property_read_string_array,
-};
-
 /**
  * device_property_present - check if a property of a device is present
  * @dev: Device whose property is being checked
@@ -759,223 +484,25 @@ int fwnode_property_get_reference_args(const struct fwnode_handle *fwnode,
 }
 EXPORT_SYMBOL_GPL(fwnode_property_get_reference_args);
 
-static void property_entry_free_data(const struct property_entry *p)
-{
-	const void *pointer = property_get_pointer(p);
-	size_t i, nval;
-
-	if (p->is_array) {
-		if (p->type == DEV_PROP_STRING && p->pointer.str) {
-			nval = p->length / sizeof(const char *);
-			for (i = 0; i < nval; i++)
-				kfree(p->pointer.str[i]);
-		}
-		kfree(pointer);
-	} else if (p->type == DEV_PROP_STRING) {
-		kfree(p->value.str);
-	}
-	kfree(p->name);
-}
-
-static int property_copy_string_array(struct property_entry *dst,
-				      const struct property_entry *src)
-{
-	const char **d;
-	size_t nval = src->length / sizeof(*d);
-	int i;
-
-	d = kcalloc(nval, sizeof(*d), GFP_KERNEL);
-	if (!d)
-		return -ENOMEM;
-
-	for (i = 0; i < nval; i++) {
-		d[i] = kstrdup(src->pointer.str[i], GFP_KERNEL);
-		if (!d[i] && src->pointer.str[i]) {
-			while (--i >= 0)
-				kfree(d[i]);
-			kfree(d);
-			return -ENOMEM;
-		}
-	}
-
-	dst->pointer.str = d;
-	return 0;
-}
-
-static int property_entry_copy_data(struct property_entry *dst,
-				    const struct property_entry *src)
-{
-	const void *pointer = property_get_pointer(src);
-	const void *new;
-	int error;
-
-	if (src->is_array) {
-		if (!src->length)
-			return -ENODATA;
-
-		if (src->type == DEV_PROP_STRING) {
-			error = property_copy_string_array(dst, src);
-			if (error)
-				return error;
-			new = dst->pointer.str;
-		} else {
-			new = kmemdup(pointer, src->length, GFP_KERNEL);
-			if (!new)
-				return -ENOMEM;
-		}
-	} else if (src->type == DEV_PROP_STRING) {
-		new = kstrdup(src->value.str, GFP_KERNEL);
-		if (!new && src->value.str)
-			return -ENOMEM;
-	} else {
-		new = pointer;
-	}
-
-	dst->length = src->length;
-	dst->is_array = src->is_array;
-	dst->type = src->type;
-
-	property_set_pointer(dst, new);
-
-	dst->name = kstrdup(src->name, GFP_KERNEL);
-	if (!dst->name)
-		goto out_free_data;
-
-	return 0;
-
-out_free_data:
-	property_entry_free_data(dst);
-	return -ENOMEM;
-}
-
-/**
- * property_entries_dup - duplicate array of properties
- * @properties: array of properties to copy
- *
- * This function creates a deep copy of the given NULL-terminated array
- * of property entries.
- */
-struct property_entry *
-property_entries_dup(const struct property_entry *properties)
-{
-	struct property_entry *p;
-	int i, n = 0;
-
-	while (properties[n].name)
-		n++;
-
-	p = kcalloc(n + 1, sizeof(*p), GFP_KERNEL);
-	if (!p)
-		return ERR_PTR(-ENOMEM);
-
-	for (i = 0; i < n; i++) {
-		int ret = property_entry_copy_data(&p[i], &properties[i]);
-		if (ret) {
-			while (--i >= 0)
-				property_entry_free_data(&p[i]);
-			kfree(p);
-			return ERR_PTR(ret);
-		}
-	}
-
-	return p;
-}
-EXPORT_SYMBOL_GPL(property_entries_dup);
-
-/**
- * property_entries_free - free previously allocated array of properties
- * @properties: array of properties to destroy
- *
- * This function frees given NULL-terminated array of property entries,
- * along with their data.
- */
-void property_entries_free(const struct property_entry *properties)
-{
-	const struct property_entry *p;
-
-	for (p = properties; p->name; p++)
-		property_entry_free_data(p);
-
-	kfree(properties);
-}
-EXPORT_SYMBOL_GPL(property_entries_free);
-
-/**
- * pset_free_set - releases memory allocated for copied property set
- * @pset: Property set to release
- *
- * Function takes previously copied property set and releases all the
- * memory allocated to it.
- */
-static void pset_free_set(struct property_set *pset)
-{
-	if (!pset)
-		return;
-
-	property_entries_free(pset->properties);
-	kfree(pset);
-}
-
-/**
- * pset_copy_set - copies property set
- * @pset: Property set to copy
- *
- * This function takes a deep copy of the given property set and returns
- * pointer to the copy. Call device_free_property_set() to free resources
- * allocated in this function.
- *
- * Return: Pointer to the new property set or error pointer.
- */
-static struct property_set *pset_copy_set(const struct property_set *pset)
-{
-	struct property_entry *properties;
-	struct property_set *p;
-
-	p = kzalloc(sizeof(*p), GFP_KERNEL);
-	if (!p)
-		return ERR_PTR(-ENOMEM);
-
-	properties = property_entries_dup(pset->properties);
-	if (IS_ERR(properties)) {
-		kfree(p);
-		return ERR_CAST(properties);
-	}
-
-	p->properties = properties;
-	return p;
-}
-
 /**
  * device_remove_properties - Remove properties from a device object.
  * @dev: Device whose properties to remove.
  *
  * The function removes properties previously associated to the device
- * secondary firmware node with device_add_properties(). Memory allocated
- * to the properties will also be released.
+ * firmware node with device_add_properties(). Memory allocated to the
+ * properties will also be released.
  */
 void device_remove_properties(struct device *dev)
 {
-	struct fwnode_handle *fwnode;
-	struct property_set *pset;
+	struct fwnode_handle *fwnode = dev_fwnode(dev);
 
-	fwnode = dev_fwnode(dev);
 	if (!fwnode)
 		return;
-	/*
-	 * Pick either primary or secondary node depending which one holds
-	 * the pset. If there is no real firmware node (ACPI/DT) primary
-	 * will hold the pset.
-	 */
-	pset = to_pset_node(fwnode);
-	if (pset) {
-		set_primary_fwnode(dev, NULL);
-	} else {
-		pset = to_pset_node(fwnode->secondary);
-		if (pset && dev == pset->dev)
-			set_secondary_fwnode(dev, NULL);
+
+	if (is_software_node(fwnode->secondary)) {
+		fwnode_remove_software_node(fwnode->secondary);
+		set_secondary_fwnode(dev, NULL);
 	}
-	if (pset && dev == pset->dev)
-		pset_free_set(pset);
 }
 EXPORT_SYMBOL_GPL(device_remove_properties);
 
@@ -985,26 +512,22 @@ EXPORT_SYMBOL_GPL(device_remove_properties);
  * @properties: Collection of properties to add.
  *
  * Associate a collection of device properties represented by @properties with
- * @dev as its secondary firmware node. The function takes a copy of
- * @properties.
+ * @dev. The function takes a copy of @properties.
+ *
+ * WARNING: The callers should not use this function if it is known that there
+ * is no real firmware node associated with @dev! In that case the callers
+ * should create a software node and assign it to @dev directly.
  */
 int device_add_properties(struct device *dev,
 			  const struct property_entry *properties)
 {
-	struct property_set *p, pset;
-
-	if (!properties)
-		return -EINVAL;
-
-	pset.properties = properties;
+	struct fwnode_handle *fwnode;
 
-	p = pset_copy_set(&pset);
-	if (IS_ERR(p))
-		return PTR_ERR(p);
+	fwnode = fwnode_create_software_node(properties, NULL);
+	if (IS_ERR(fwnode))
+		return PTR_ERR(fwnode);
 
-	p->fwnode.ops = &pset_fwnode_ops;
-	set_secondary_fwnode(dev, &p->fwnode);
-	p->dev = dev;
+	set_secondary_fwnode(dev, fwnode);
 	return 0;
 }
 EXPORT_SYMBOL_GPL(device_add_properties);
@@ -1341,7 +864,7 @@ int fwnode_irq_get(struct fwnode_handle *fwnode, unsigned int index)
 EXPORT_SYMBOL(fwnode_irq_get);
 
 /**
- * device_graph_get_next_endpoint - Get next endpoint firmware node
+ * fwnode_graph_get_next_endpoint - Get next endpoint firmware node
  * @fwnode: Pointer to the parent firmware node
  * @prev: Previous endpoint node or %NULL to get the first
  *
diff --git a/drivers/base/swnode.c b/drivers/base/swnode.c
new file mode 100644
index 000000000000..306bb93287af
--- /dev/null
+++ b/drivers/base/swnode.c
@@ -0,0 +1,675 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Software nodes for the firmware node framework.
+ *
+ * Copyright (C) 2018, Intel Corporation
+ * Author: Heikki Krogerus <heikki.krogerus@linux.intel.com>
+ */
+
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/property.h>
+#include <linux/slab.h>
+
+struct software_node {
+	int id;
+	struct kobject kobj;
+	struct fwnode_handle fwnode;
+
+	/* hierarchy */
+	struct ida child_ids;
+	struct list_head entry;
+	struct list_head children;
+	struct software_node *parent;
+
+	/* properties */
+	const struct property_entry *properties;
+};
+
+static DEFINE_IDA(swnode_root_ids);
+static struct kset *swnode_kset;
+
+#define kobj_to_swnode(_kobj_) container_of(_kobj_, struct software_node, kobj)
+
+static const struct fwnode_operations software_node_ops;
+
+bool is_software_node(const struct fwnode_handle *fwnode)
+{
+	return !IS_ERR_OR_NULL(fwnode) && fwnode->ops == &software_node_ops;
+}
+
+#define to_software_node(__fwnode)					\
+	({								\
+		typeof(__fwnode) __to_software_node_fwnode = __fwnode;	\
+									\
+		is_software_node(__to_software_node_fwnode) ?		\
+			container_of(__to_software_node_fwnode,		\
+				     struct software_node, fwnode) :	\
+			NULL;						\
+	})
+
+/* -------------------------------------------------------------------------- */
+/* property_entry processing */
+
+static const struct property_entry *
+property_entry_get(const struct property_entry *prop, const char *name)
+{
+	if (!prop)
+		return NULL;
+
+	for (; prop->name; prop++)
+		if (!strcmp(name, prop->name))
+			return prop;
+
+	return NULL;
+}
+
+static void
+property_set_pointer(struct property_entry *prop, const void *pointer)
+{
+	switch (prop->type) {
+	case DEV_PROP_U8:
+		if (prop->is_array)
+			prop->pointer.u8_data = pointer;
+		else
+			prop->value.u8_data = *((u8 *)pointer);
+		break;
+	case DEV_PROP_U16:
+		if (prop->is_array)
+			prop->pointer.u16_data = pointer;
+		else
+			prop->value.u16_data = *((u16 *)pointer);
+		break;
+	case DEV_PROP_U32:
+		if (prop->is_array)
+			prop->pointer.u32_data = pointer;
+		else
+			prop->value.u32_data = *((u32 *)pointer);
+		break;
+	case DEV_PROP_U64:
+		if (prop->is_array)
+			prop->pointer.u64_data = pointer;
+		else
+			prop->value.u64_data = *((u64 *)pointer);
+		break;
+	case DEV_PROP_STRING:
+		if (prop->is_array)
+			prop->pointer.str = pointer;
+		else
+			prop->value.str = pointer;
+		break;
+	default:
+		break;
+	}
+}
+
+static const void *property_get_pointer(const struct property_entry *prop)
+{
+	switch (prop->type) {
+	case DEV_PROP_U8:
+		if (prop->is_array)
+			return prop->pointer.u8_data;
+		return &prop->value.u8_data;
+	case DEV_PROP_U16:
+		if (prop->is_array)
+			return prop->pointer.u16_data;
+		return &prop->value.u16_data;
+	case DEV_PROP_U32:
+		if (prop->is_array)
+			return prop->pointer.u32_data;
+		return &prop->value.u32_data;
+	case DEV_PROP_U64:
+		if (prop->is_array)
+			return prop->pointer.u64_data;
+		return &prop->value.u64_data;
+	case DEV_PROP_STRING:
+		if (prop->is_array)
+			return prop->pointer.str;
+		return &prop->value.str;
+	default:
+		return NULL;
+	}
+}
+
+static const void *property_entry_find(const struct property_entry *props,
+				       const char *propname, size_t length)
+{
+	const struct property_entry *prop;
+	const void *pointer;
+
+	prop = property_entry_get(props, propname);
+	if (!prop)
+		return ERR_PTR(-EINVAL);
+	pointer = property_get_pointer(prop);
+	if (!pointer)
+		return ERR_PTR(-ENODATA);
+	if (length > prop->length)
+		return ERR_PTR(-EOVERFLOW);
+	return pointer;
+}
+
+static int property_entry_read_u8_array(const struct property_entry *props,
+					const char *propname,
+					u8 *values, size_t nval)
+{
+	const void *pointer;
+	size_t length = nval * sizeof(*values);
+
+	pointer = property_entry_find(props, propname, length);
+	if (IS_ERR(pointer))
+		return PTR_ERR(pointer);
+
+	memcpy(values, pointer, length);
+	return 0;
+}
+
+static int property_entry_read_u16_array(const struct property_entry *props,
+					 const char *propname,
+					 u16 *values, size_t nval)
+{
+	const void *pointer;
+	size_t length = nval * sizeof(*values);
+
+	pointer = property_entry_find(props, propname, length);
+	if (IS_ERR(pointer))
+		return PTR_ERR(pointer);
+
+	memcpy(values, pointer, length);
+	return 0;
+}
+
+static int property_entry_read_u32_array(const struct property_entry *props,
+					 const char *propname,
+					 u32 *values, size_t nval)
+{
+	const void *pointer;
+	size_t length = nval * sizeof(*values);
+
+	pointer = property_entry_find(props, propname, length);
+	if (IS_ERR(pointer))
+		return PTR_ERR(pointer);
+
+	memcpy(values, pointer, length);
+	return 0;
+}
+
+static int property_entry_read_u64_array(const struct property_entry *props,
+					 const char *propname,
+					 u64 *values, size_t nval)
+{
+	const void *pointer;
+	size_t length = nval * sizeof(*values);
+
+	pointer = property_entry_find(props, propname, length);
+	if (IS_ERR(pointer))
+		return PTR_ERR(pointer);
+
+	memcpy(values, pointer, length);
+	return 0;
+}
+
+static int
+property_entry_count_elems_of_size(const struct property_entry *props,
+				   const char *propname, size_t length)
+{
+	const struct property_entry *prop;
+
+	prop = property_entry_get(props, propname);
+	if (!prop)
+		return -EINVAL;
+
+	return prop->length / length;
+}
+
+static int property_entry_read_int_array(const struct property_entry *props,
+					 const char *name,
+					 unsigned int elem_size, void *val,
+					 size_t nval)
+{
+	if (!val)
+		return property_entry_count_elems_of_size(props, name,
+							  elem_size);
+	switch (elem_size) {
+	case sizeof(u8):
+		return property_entry_read_u8_array(props, name, val, nval);
+	case sizeof(u16):
+		return property_entry_read_u16_array(props, name, val, nval);
+	case sizeof(u32):
+		return property_entry_read_u32_array(props, name, val, nval);
+	case sizeof(u64):
+		return property_entry_read_u64_array(props, name, val, nval);
+	}
+
+	return -ENXIO;
+}
+
+static int property_entry_read_string_array(const struct property_entry *props,
+					    const char *propname,
+					    const char **strings, size_t nval)
+{
+	const struct property_entry *prop;
+	const void *pointer;
+	size_t array_len, length;
+
+	/* Find out the array length. */
+	prop = property_entry_get(props, propname);
+	if (!prop)
+		return -EINVAL;
+
+	if (prop->is_array)
+		/* Find the length of an array. */
+		array_len = property_entry_count_elems_of_size(props, propname,
+							  sizeof(const char *));
+	else
+		/* The array length for a non-array string property is 1. */
+		array_len = 1;
+
+	/* Return how many there are if strings is NULL. */
+	if (!strings)
+		return array_len;
+
+	array_len = min(nval, array_len);
+	length = array_len * sizeof(*strings);
+
+	pointer = property_entry_find(props, propname, length);
+	if (IS_ERR(pointer))
+		return PTR_ERR(pointer);
+
+	memcpy(strings, pointer, length);
+
+	return array_len;
+}
+
+static void property_entry_free_data(const struct property_entry *p)
+{
+	const void *pointer = property_get_pointer(p);
+	size_t i, nval;
+
+	if (p->is_array) {
+		if (p->type == DEV_PROP_STRING && p->pointer.str) {
+			nval = p->length / sizeof(const char *);
+			for (i = 0; i < nval; i++)
+				kfree(p->pointer.str[i]);
+		}
+		kfree(pointer);
+	} else if (p->type == DEV_PROP_STRING) {
+		kfree(p->value.str);
+	}
+	kfree(p->name);
+}
+
+static int property_copy_string_array(struct property_entry *dst,
+				      const struct property_entry *src)
+{
+	const char **d;
+	size_t nval = src->length / sizeof(*d);
+	int i;
+
+	d = kcalloc(nval, sizeof(*d), GFP_KERNEL);
+	if (!d)
+		return -ENOMEM;
+
+	for (i = 0; i < nval; i++) {
+		d[i] = kstrdup(src->pointer.str[i], GFP_KERNEL);
+		if (!d[i] && src->pointer.str[i]) {
+			while (--i >= 0)
+				kfree(d[i]);
+			kfree(d);
+			return -ENOMEM;
+		}
+	}
+
+	dst->pointer.str = d;
+	return 0;
+}
+
+static int property_entry_copy_data(struct property_entry *dst,
+				    const struct property_entry *src)
+{
+	const void *pointer = property_get_pointer(src);
+	const void *new;
+	int error;
+
+	if (src->is_array) {
+		if (!src->length)
+			return -ENODATA;
+
+		if (src->type == DEV_PROP_STRING) {
+			error = property_copy_string_array(dst, src);
+			if (error)
+				return error;
+			new = dst->pointer.str;
+		} else {
+			new = kmemdup(pointer, src->length, GFP_KERNEL);
+			if (!new)
+				return -ENOMEM;
+		}
+	} else if (src->type == DEV_PROP_STRING) {
+		new = kstrdup(src->value.str, GFP_KERNEL);
+		if (!new && src->value.str)
+			return -ENOMEM;
+	} else {
+		new = pointer;
+	}
+
+	dst->length = src->length;
+	dst->is_array = src->is_array;
+	dst->type = src->type;
+
+	property_set_pointer(dst, new);
+
+	dst->name = kstrdup(src->name, GFP_KERNEL);
+	if (!dst->name)
+		goto out_free_data;
+
+	return 0;
+
+out_free_data:
+	property_entry_free_data(dst);
+	return -ENOMEM;
+}
+
+/**
+ * property_entries_dup - duplicate array of properties
+ * @properties: array of properties to copy
+ *
+ * This function creates a deep copy of the given NULL-terminated array
+ * of property entries.
+ */
+struct property_entry *
+property_entries_dup(const struct property_entry *properties)
+{
+	struct property_entry *p;
+	int i, n = 0;
+	int ret;
+
+	while (properties[n].name)
+		n++;
+
+	p = kcalloc(n + 1, sizeof(*p), GFP_KERNEL);
+	if (!p)
+		return ERR_PTR(-ENOMEM);
+
+	for (i = 0; i < n; i++) {
+		ret = property_entry_copy_data(&p[i], &properties[i]);
+		if (ret) {
+			while (--i >= 0)
+				property_entry_free_data(&p[i]);
+			kfree(p);
+			return ERR_PTR(ret);
+		}
+	}
+
+	return p;
+}
+EXPORT_SYMBOL_GPL(property_entries_dup);
+
+/**
+ * property_entries_free - free previously allocated array of properties
+ * @properties: array of properties to destroy
+ *
+ * This function frees given NULL-terminated array of property entries,
+ * along with their data.
+ */
+void property_entries_free(const struct property_entry *properties)
+{
+	const struct property_entry *p;
+
+	if (!properties)
+		return;
+
+	for (p = properties; p->name; p++)
+		property_entry_free_data(p);
+
+	kfree(properties);
+}
+EXPORT_SYMBOL_GPL(property_entries_free);
+
+/* -------------------------------------------------------------------------- */
+/* fwnode operations */
+
+static struct fwnode_handle *software_node_get(struct fwnode_handle *fwnode)
+{
+	struct software_node *swnode = to_software_node(fwnode);
+
+	kobject_get(&swnode->kobj);
+
+	return &swnode->fwnode;
+}
+
+static void software_node_put(struct fwnode_handle *fwnode)
+{
+	struct software_node *swnode = to_software_node(fwnode);
+
+	kobject_put(&swnode->kobj);
+}
+
+static bool software_node_property_present(const struct fwnode_handle *fwnode,
+					   const char *propname)
+{
+	return !!property_entry_get(to_software_node(fwnode)->properties,
+				    propname);
+}
+
+static int software_node_read_int_array(const struct fwnode_handle *fwnode,
+					const char *propname,
+					unsigned int elem_size, void *val,
+					size_t nval)
+{
+	struct software_node *swnode = to_software_node(fwnode);
+
+	return property_entry_read_int_array(swnode->properties, propname,
+					     elem_size, val, nval);
+}
+
+static int software_node_read_string_array(const struct fwnode_handle *fwnode,
+					   const char *propname,
+					   const char **val, size_t nval)
+{
+	struct software_node *swnode = to_software_node(fwnode);
+
+	return property_entry_read_string_array(swnode->properties, propname,
+						val, nval);
+}
+
+struct fwnode_handle *
+software_node_get_parent(const struct fwnode_handle *fwnode)
+{
+	struct software_node *swnode = to_software_node(fwnode);
+
+	return swnode->parent ? &swnode->parent->fwnode : NULL;
+}
+
+struct fwnode_handle *
+software_node_get_next_child(const struct fwnode_handle *fwnode,
+			     struct fwnode_handle *child)
+{
+	struct software_node *p = to_software_node(fwnode);
+	struct software_node *c = to_software_node(child);
+
+	if (list_empty(&p->children) ||
+	    (c && list_is_last(&c->entry, &p->children)))
+		return NULL;
+
+	if (c)
+		c = list_next_entry(c, entry);
+	else
+		c = list_first_entry(&p->children, struct software_node, entry);
+	return &c->fwnode;
+}
+
+
+static const struct fwnode_operations software_node_ops = {
+	.get = software_node_get,
+	.put = software_node_put,
+	.property_present = software_node_property_present,
+	.property_read_int_array = software_node_read_int_array,
+	.property_read_string_array = software_node_read_string_array,
+	.get_parent = software_node_get_parent,
+	.get_next_child_node = software_node_get_next_child,
+};
+
+/* -------------------------------------------------------------------------- */
+
+static int
+software_node_register_properties(struct software_node *swnode,
+				  const struct property_entry *properties)
+{
+	struct property_entry *props;
+
+	props = property_entries_dup(properties);
+	if (IS_ERR(props))
+		return PTR_ERR(props);
+
+	swnode->properties = props;
+
+	return 0;
+}
+
+static void software_node_release(struct kobject *kobj)
+{
+	struct software_node *swnode = kobj_to_swnode(kobj);
+
+	if (swnode->parent) {
+		ida_simple_remove(&swnode->parent->child_ids, swnode->id);
+		list_del(&swnode->entry);
+	} else {
+		ida_simple_remove(&swnode_root_ids, swnode->id);
+	}
+
+	ida_destroy(&swnode->child_ids);
+	property_entries_free(swnode->properties);
+	kfree(swnode);
+}
+
+static struct kobj_type software_node_type = {
+	.release = software_node_release,
+	.sysfs_ops = &kobj_sysfs_ops,
+};
+
+struct fwnode_handle *
+fwnode_create_software_node(const struct property_entry *properties,
+			    const struct fwnode_handle *parent)
+{
+	struct software_node *p = NULL;
+	struct software_node *swnode;
+	int ret;
+
+	if (parent) {
+		if (IS_ERR(parent))
+			return ERR_CAST(parent);
+		if (!is_software_node(parent))
+			return ERR_PTR(-EINVAL);
+		p = to_software_node(parent);
+	}
+
+	swnode = kzalloc(sizeof(*swnode), GFP_KERNEL);
+	if (!swnode)
+		return ERR_PTR(-ENOMEM);
+
+	ret = ida_simple_get(p ? &p->child_ids : &swnode_root_ids, 0, 0,
+			     GFP_KERNEL);
+	if (ret < 0) {
+		kfree(swnode);
+		return ERR_PTR(ret);
+	}
+
+	swnode->id = ret;
+	swnode->kobj.kset = swnode_kset;
+	swnode->fwnode.ops = &software_node_ops;
+
+	ida_init(&swnode->child_ids);
+	INIT_LIST_HEAD(&swnode->entry);
+	INIT_LIST_HEAD(&swnode->children);
+	swnode->parent = p;
+
+	if (p)
+		list_add_tail(&swnode->entry, &p->children);
+
+	ret = kobject_init_and_add(&swnode->kobj, &software_node_type,
+				   p ? &p->kobj : NULL, "node%d", swnode->id);
+	if (ret) {
+		kobject_put(&swnode->kobj);
+		return ERR_PTR(ret);
+	}
+
+	ret = software_node_register_properties(swnode, properties);
+	if (ret) {
+		kobject_put(&swnode->kobj);
+		return ERR_PTR(ret);
+	}
+
+	kobject_uevent(&swnode->kobj, KOBJ_ADD);
+	return &swnode->fwnode;
+}
+EXPORT_SYMBOL_GPL(fwnode_create_software_node);
+
+void fwnode_remove_software_node(struct fwnode_handle *fwnode)
+{
+	struct software_node *swnode = to_software_node(fwnode);
+
+	if (!swnode)
+		return;
+
+	kobject_put(&swnode->kobj);
+}
+EXPORT_SYMBOL_GPL(fwnode_remove_software_node);
+
+int software_node_notify(struct device *dev, unsigned long action)
+{
+	struct fwnode_handle *fwnode = dev_fwnode(dev);
+	struct software_node *swnode;
+	int ret;
+
+	if (!fwnode)
+		return 0;
+
+	if (!is_software_node(fwnode))
+		fwnode = fwnode->secondary;
+	if (!is_software_node(fwnode))
+		return 0;
+
+	swnode = to_software_node(fwnode);
+
+	switch (action) {
+	case KOBJ_ADD:
+		ret = sysfs_create_link(&dev->kobj, &swnode->kobj,
+					"software_node");
+		if (ret)
+			break;
+
+		ret = sysfs_create_link(&swnode->kobj, &dev->kobj,
+					dev_name(dev));
+		if (ret) {
+			sysfs_remove_link(&dev->kobj, "software_node");
+			break;
+		}
+		kobject_get(&swnode->kobj);
+		break;
+	case KOBJ_REMOVE:
+		sysfs_remove_link(&swnode->kobj, dev_name(dev));
+		sysfs_remove_link(&dev->kobj, "software_node");
+		kobject_put(&swnode->kobj);
+		break;
+	default:
+		break;
+	}
+
+	return 0;
+}
+
+static int __init software_node_init(void)
+{
+	swnode_kset = kset_create_and_add("software_nodes", NULL, kernel_kobj);
+	if (!swnode_kset)
+		return -ENOMEM;
+	return 0;
+}
+postcore_initcall(software_node_init);
+
+static void __exit software_node_exit(void)
+{
+	ida_destroy(&swnode_root_ids);
+	kset_unregister(swnode_kset);
+}
+__exitcall(software_node_exit);