d8c5008841
The DT overlay code will need to manipulate nodes and properties while already holding the devicetree lock, or on nodes that are not yet attached to the tree, but the current helper functions don't allow that. Extract the core behaviour from the accessors and create the following unlocked variants. The unlocked variants require either the lock to already be held or for the nodes to be detached from the tree. Changes to live nodes will not get updated in sysfs, so the caller must arrange for housekeeping to take place after dropping the lock. The new functions are: __of_add_property(), __of_remove_property(), __of_update_property(), __of_attach_node() and __of_detach_node(). Signed-off-by: Pantelis Antoniou <pantelis.antoniou@konsulko.com> [Remove unnecessary diff hunks and rewrite commit text] Signed-off-by: Grant Likely <grant.likely@linaro.org>
73 lines
2.3 KiB
C
73 lines
2.3 KiB
C
#ifndef _LINUX_OF_PRIVATE_H
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#define _LINUX_OF_PRIVATE_H
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/*
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* Private symbols used by OF support code
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*
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* Paul Mackerras August 1996.
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* Copyright (C) 1996-2005 Paul Mackerras.
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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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/**
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* struct alias_prop - Alias property in 'aliases' node
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* @link: List node to link the structure in aliases_lookup list
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* @alias: Alias property name
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* @np: Pointer to device_node that the alias stands for
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* @id: Index value from end of alias name
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* @stem: Alias string without the index
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*
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* The structure represents one alias property of 'aliases' node as
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* an entry in aliases_lookup list.
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*/
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struct alias_prop {
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struct list_head link;
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const char *alias;
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struct device_node *np;
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int id;
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char stem[0];
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};
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extern struct mutex of_mutex;
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extern struct list_head aliases_lookup;
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static inline struct device_node *kobj_to_device_node(struct kobject *kobj)
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{
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return container_of(kobj, struct device_node, kobj);
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}
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#if defined(CONFIG_OF_DYNAMIC)
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extern int of_property_notify(int action, struct device_node *np,
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struct property *prop);
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extern void of_node_release(struct kobject *kobj);
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#else /* CONFIG_OF_DYNAMIC */
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static inline int of_property_notify(int action, struct device_node *np,
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struct property *prop)
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{
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return 0;
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}
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#endif /* CONFIG_OF_DYNAMIC */
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/**
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* General utilities for working with live trees.
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*
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* All functions with two leading underscores operate
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* without taking node references, so you either have to
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* own the devtree lock or work on detached trees only.
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*/
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struct property *__of_prop_dup(const struct property *prop, gfp_t allocflags);
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struct device_node *__of_node_alloc(const char *full_name, gfp_t allocflags);
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extern int __of_add_property(struct device_node *np, struct property *prop);
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extern int __of_remove_property(struct device_node *np, struct property *prop);
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extern int __of_update_property(struct device_node *np,
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struct property *newprop, struct property **oldprop);
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extern void __of_attach_node(struct device_node *np);
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extern void __of_detach_node(struct device_node *np);
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#endif /* _LINUX_OF_PRIVATE_H */
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