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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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f4eb010706
Iterating through a device node's parents is simple enough, but dealing
with the refcounts properly is a little ugly, and replicating that logic
is asking for someone to get it wrong or forget it all together, eg:
while (dn != NULL) {
/* loop body */
tmp = of_get_parent(dn);
of_node_put(dn);
dn = tmp;
}
So add of_get_next_parent(), inspired by of_get_next_child(). The
contract is that it returns the parent and drops the reference on the
current node, this makes the loop look like:
while (dn != NULL) {
/* loop body */
dn = of_get_next_parent(dn);
}
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Paul Mackerras <paulus@samba.org>
74 lines
3.0 KiB
C
74 lines
3.0 KiB
C
#ifndef _LINUX_OF_H
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#define _LINUX_OF_H
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/*
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* Definitions for talking to the Open Firmware PROM on
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* Power Macintosh and other computers.
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*
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* Copyright (C) 1996-2005 Paul Mackerras.
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*
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* Updates for PPC64 by Peter Bergner & David Engebretsen, IBM Corp.
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* Updates for SPARC64 by David S. Miller
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* Derived from PowerPC and Sparc prom.h files by Stephen Rothwell, IBM Corp.
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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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#include <linux/types.h>
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#include <linux/bitops.h>
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#include <linux/mod_devicetable.h>
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#include <asm/prom.h>
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/* flag descriptions */
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#define OF_DYNAMIC 1 /* node and properties were allocated via kmalloc */
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#define OF_DETACHED 2 /* node has been detached from the device tree */
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#define OF_BAD_ADDR ((u64)-1)
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extern struct device_node *of_find_node_by_name(struct device_node *from,
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const char *name);
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#define for_each_node_by_name(dn, name) \
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for (dn = of_find_node_by_name(NULL, name); dn; \
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dn = of_find_node_by_name(dn, name))
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extern struct device_node *of_find_node_by_type(struct device_node *from,
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const char *type);
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#define for_each_node_by_type(dn, type) \
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for (dn = of_find_node_by_type(NULL, type); dn; \
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dn = of_find_node_by_type(dn, type))
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extern struct device_node *of_find_compatible_node(struct device_node *from,
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const char *type, const char *compat);
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#define for_each_compatible_node(dn, type, compatible) \
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for (dn = of_find_compatible_node(NULL, type, compatible); dn; \
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dn = of_find_compatible_node(dn, type, compatible))
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extern struct device_node *of_find_matching_node(struct device_node *from,
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const struct of_device_id *matches);
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#define for_each_matching_node(dn, matches) \
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for (dn = of_find_matching_node(NULL, matches); dn; \
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dn = of_find_matching_node(dn, matches))
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extern struct device_node *of_find_node_by_path(const char *path);
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extern struct device_node *of_find_node_by_phandle(phandle handle);
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extern struct device_node *of_get_parent(const struct device_node *node);
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extern struct device_node *of_get_next_parent(struct device_node *node);
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extern struct device_node *of_get_next_child(const struct device_node *node,
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struct device_node *prev);
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#define for_each_child_of_node(parent, child) \
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for (child = of_get_next_child(parent, NULL); child != NULL; \
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child = of_get_next_child(parent, child))
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extern struct property *of_find_property(const struct device_node *np,
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const char *name,
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int *lenp);
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extern int of_device_is_compatible(const struct device_node *device,
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const char *);
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extern const void *of_get_property(const struct device_node *node,
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const char *name,
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int *lenp);
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extern int of_n_addr_cells(struct device_node *np);
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extern int of_n_size_cells(struct device_node *np);
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extern const struct of_device_id *of_match_node(
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const struct of_device_id *matches, const struct device_node *node);
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#endif /* _LINUX_OF_H */
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