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The device tree structure is composed of two lists; the 'allnodes' list which is a singly linked list containing every node in the tree, and the child->parent structure where each parent node has a singly linked list of children. All of the data in the allnodes list can be easily reproduced with the parent-child lists, so of_allnodes is actually unnecessary. Remove it entirely which saves a bit of memory and simplifies the data structure quite a lot. Signed-off-by: Grant Likely <grant.likely@linaro.org> Cc: Rob Herring <robh@kernel.org> Cc: Gaurav Minocha <gaurav.minocha.os@gmail.com> Cc: Pantelis Antoniou <pantelis@pantelis.antoniou@konsulko.com>
44 lines
1.4 KiB
C
44 lines
1.4 KiB
C
/*
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* Definitions for building a device tree by calling into the
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* Open Firmware PROM.
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*
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* Copyright (C) 2010 Andres Salomon <dilinger@queued.net>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#ifndef _LINUX_OF_PDT_H
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#define _LINUX_OF_PDT_H
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/* overridable operations for calling into the PROM */
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struct of_pdt_ops {
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/*
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* buf should be 32 bytes; return 0 on success.
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* If prev is NULL, the first property will be returned.
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*/
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int (*nextprop)(phandle node, char *prev, char *buf);
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/* for both functions, return proplen on success; -1 on error */
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int (*getproplen)(phandle node, const char *prop);
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int (*getproperty)(phandle node, const char *prop, char *buf,
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int bufsize);
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/* phandles are 0 if no child or sibling exists */
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phandle (*getchild)(phandle parent);
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phandle (*getsibling)(phandle node);
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/* return 0 on success; fill in 'len' with number of bytes in path */
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int (*pkg2path)(phandle node, char *buf, const int buflen, int *len);
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};
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extern void *prom_early_alloc(unsigned long size);
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/* for building the device tree */
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extern void of_pdt_build_devicetree(phandle root_node, struct of_pdt_ops *ops);
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extern void (*of_pdt_build_more)(struct device_node *dp);
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#endif /* _LINUX_OF_PDT_H */
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