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62b1db3377
Add a way to flatten a devicetree into binary form. For livetree this involves generating the devicetree using fdt_property() and other calls. For flattree it simply involves providing the buffer containing the tree. Signed-off-by: Simon Glass <sjg@chromium.org>
68 lines
1.8 KiB
C
68 lines
1.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Copyright (c) 2017 Google, Inc
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* Written by Simon Glass <sjg@chromium.org>
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*
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* Support for a 'live' (as opposed to flat) device tree
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*/
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#ifndef _OF_LIVE_H
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#define _OF_LIVE_H
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struct abuf;
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struct device_node;
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/**
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* of_live_build() - build a live (hierarchical) tree from a flat DT
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*
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* @fdt_blob: Input tree to convert
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* @rootp: Returns live tree that was created
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* Return: 0 if OK, -ve on error
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*/
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int of_live_build(const void *fdt_blob, struct device_node **rootp);
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/**
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* unflatten_device_tree() - create tree of device_nodes from flat blob
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*
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* Note that this allocates a single block of memory, pointed to by *mynodes.
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* To free the tree, use free(*mynodes)
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*
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* unflattens a device-tree, creating the
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* tree of struct device_node. It also fills the "name" and "type"
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* pointers of the nodes so the normal device-tree walking functions
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* can be used.
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* @blob: The blob to expand
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* @mynodes: The device_node tree created by the call
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* Return: 0 if OK, -ve on error
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*/
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int unflatten_device_tree(const void *blob, struct device_node **mynodes);
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/**
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* of_live_free() - Dispose of a livetree
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*
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* This frees memory used by the tree, after which @root becomes invalid and
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* cannot be used
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*
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* @root: Tree to dispose
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*/
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void of_live_free(struct device_node *root);
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/**
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* of_live_create_empty() - Create a new, empty tree
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*
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* @rootp: Returns the root node of the created tree
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* Return: 0 if OK, -ENOMEM if out of memory
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*/
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int of_live_create_empty(struct device_node **rootp);
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/**
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* of_live_flatten() - Create an FDT from a hierarchical tree
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*
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* @root: Root node of tree to convert
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* @buf: Buffer to return the tree (inited by this function)
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* Return: 0 if OK, -ENOMEM if out of memory
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*/
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int of_live_flatten(const struct device_node *root, struct abuf *buf);
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#endif
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