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linux-next/include/linux/of_pdt.h
Grant Likely 5063e25a30 of: Eliminate of_allnodes list
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>
2014-11-04 13:29:38 +00:00

45 lines
1.4 KiB
C

/*
* Definitions for building a device tree by calling into the
* Open Firmware PROM.
*
* Copyright (C) 2010 Andres Salomon <dilinger@queued.net>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#ifndef _LINUX_OF_PDT_H
#define _LINUX_OF_PDT_H
/* overridable operations for calling into the PROM */
struct of_pdt_ops {
/*
* buf should be 32 bytes; return 0 on success.
* If prev is NULL, the first property will be returned.
*/
int (*nextprop)(phandle node, char *prev, char *buf);
/* for both functions, return proplen on success; -1 on error */
int (*getproplen)(phandle node, const char *prop);
int (*getproperty)(phandle node, const char *prop, char *buf,
int bufsize);
/* phandles are 0 if no child or sibling exists */
phandle (*getchild)(phandle parent);
phandle (*getsibling)(phandle node);
/* return 0 on success; fill in 'len' with number of bytes in path */
int (*pkg2path)(phandle node, char *buf, const int buflen, int *len);
};
extern void *prom_early_alloc(unsigned long size);
/* for building the device tree */
extern void of_pdt_build_devicetree(phandle root_node, struct of_pdt_ops *ops);
extern void (*of_pdt_build_more)(struct device_node *dp);
#endif /* _LINUX_OF_PDT_H */