diff --git a/Documentation/ABI/testing/sysfs-devices-software_node b/Documentation/ABI/testing/sysfs-devices-software_node
new file mode 100644
index 000000000000..85df37de359f
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-devices-software_node
@@ -0,0 +1,10 @@
+What:		/sys/devices/.../software_node/
+Date:		January 2019
+Contact:	Heikki Krogerus <heikki.krogerus@linux.intel.com>
+Description:
+		This directory contains the details about the device that are
+		assigned in kernel (i.e. software), as opposed to the
+		firmware_node directory which contains the details that are
+		assigned for the device in firmware. The main attributes in the
+		directory will show the properties the device has, and the
+		relationship it has to some of the other devices.
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 260cbdf44f1d..a2f14098663f 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -738,6 +738,10 @@ device_platform_notify(struct device *dev, enum kobject_action 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)
diff --git a/drivers/base/swnode.c b/drivers/base/swnode.c
new file mode 100644
index 000000000000..db60e8edf366
--- /dev/null
+++ b/drivers/base/swnode.c
@@ -0,0 +1,493 @@
+// 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 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;
+}
+
+/* -------------------------------------------------------------------------- */
+/* 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;
+	char node_name[20];
+	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);
+
+	swnode->id = ida_simple_get(p ? &p->child_ids : &swnode_root_ids, 0, 0,
+				    GFP_KERNEL);
+	if (swnode->id < 0) {
+		kfree(swnode);
+		return ERR_PTR(swnode->id);
+	}
+
+	sprintf(node_name, "node%d", swnode->id);
+
+	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_name);
+	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);
diff --git a/include/linux/property.h b/include/linux/property.h
index ac8a1ebc4c1b..3789ec755fb6 100644
--- a/include/linux/property.h
+++ b/include/linux/property.h
@@ -311,4 +311,16 @@ fwnode_graph_get_remote_node(const struct fwnode_handle *fwnode, u32 port,
 int fwnode_graph_parse_endpoint(const struct fwnode_handle *fwnode,
 				struct fwnode_endpoint *endpoint);
 
+/* -------------------------------------------------------------------------- */
+/* Software fwnode support - when HW description is incomplete or missing */
+
+bool is_software_node(const struct fwnode_handle *fwnode);
+
+int software_node_notify(struct device *dev, unsigned long action);
+
+struct fwnode_handle *
+fwnode_create_software_node(const struct property_entry *properties,
+			    const struct fwnode_handle *parent);
+void fwnode_remove_software_node(struct fwnode_handle *fwnode);
+
 #endif /* _LINUX_PROPERTY_H_ */
