3601b57282
Phandle references work by having 2 pieces:
- a "phandle" 1-cell property in the device tree node
- a reference to the same value in a property we want to point
to the other node
To generate the 1-cell property, we need an allocation mechanism that
gives us a unique number space. This patch adds an allocator for these
properties.
Signed-off-by: Alexander Graf <agraf@suse.de>
47 lines
2.2 KiB
C
47 lines
2.2 KiB
C
/*
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* Header with function prototypes to help device tree manipulation using
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* libfdt. It also provides functions to read entries from device tree proc
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* interface.
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*
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* Copyright 2008 IBM Corporation.
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* Authors: Jerone Young <jyoung5@us.ibm.com>
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* Hollis Blanchard <hollisb@us.ibm.com>
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*
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* This work is licensed under the GNU GPL license version 2 or later.
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*
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*/
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#ifndef __DEVICE_TREE_H__
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#define __DEVICE_TREE_H__
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void *create_device_tree(int *sizep);
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void *load_device_tree(const char *filename_path, int *sizep);
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int qemu_devtree_setprop(void *fdt, const char *node_path,
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const char *property, void *val_array, int size);
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int qemu_devtree_setprop_cell(void *fdt, const char *node_path,
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const char *property, uint32_t val);
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int qemu_devtree_setprop_string(void *fdt, const char *node_path,
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const char *property, const char *string);
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int qemu_devtree_setprop_phandle(void *fdt, const char *node_path,
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const char *property,
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const char *target_node_path);
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uint32_t qemu_devtree_get_phandle(void *fdt, const char *path);
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uint32_t qemu_devtree_alloc_phandle(void *fdt);
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int qemu_devtree_nop_node(void *fdt, const char *node_path);
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int qemu_devtree_add_subnode(void *fdt, const char *name);
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#define qemu_devtree_setprop_cells(fdt, node_path, property, ...) \
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do { \
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uint32_t qdt_tmp[] = { __VA_ARGS__ }; \
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int i; \
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\
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for (i = 0; i < ARRAY_SIZE(qdt_tmp); i++) { \
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qdt_tmp[i] = cpu_to_be32(qdt_tmp[i]); \
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} \
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qemu_devtree_setprop(fdt, node_path, property, qdt_tmp, \
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sizeof(qdt_tmp)); \
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} while (0)
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#endif /* __DEVICE_TREE_H__ */
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