linux-imx

// SPDX-License-Identifier: GPL-2.0

/*

 * Support for dynamic device trees.

 *

 * On some platforms, the device tree can be manipulated at runtime.

 * The routines in this section support adding, removing and changing

 * device tree nodes.

 */

​

#define pr_fmt(fmt) "OF: " fmt

​

#include <linux/of.h>

#include <linux/spinlock.h>

#include <linux/slab.h>

#include <linux/string.h>

#include <linux/proc_fs.h>

​

#include "of_private.h"

​

static struct device_node *kobj_to_device_node(struct kobject *kobj)

{

    return container_of(kobj, struct device_node, kobj);

}

​

/**

 * of_node_get() - Increment refcount of a node

 * @node:   Node to inc refcount, NULL is supported to simplify writing of

 *      callers

 *

 * Returns node.

 */

struct device_node *of_node_get(struct device_node *node)

{

    if (node)

        kobject_get(&node->kobj);

    return node;

}

EXPORT_SYMBOL(of_node_get);

​

/**

 * of_node_put() - Decrement refcount of a node

 * @node:   Node to dec refcount, NULL is supported to simplify writing of

 *      callers

 */

void of_node_put(struct device_node *node)

{

    if (node)

        kobject_put(&node->kobj);

}

EXPORT_SYMBOL(of_node_put);

​

static BLOCKING_NOTIFIER_HEAD(of_reconfig_chain);

​

int of_reconfig_notifier_register(struct notifier_block *nb)

{

    return blocking_notifier_chain_register(&of_reconfig_chain, nb);

}

EXPORT_SYMBOL_GPL(of_reconfig_notifier_register);

​

int of_reconfig_notifier_unregister(struct notifier_block *nb)

{

    return blocking_notifier_chain_unregister(&of_reconfig_chain, nb);

}

EXPORT_SYMBOL_GPL(of_reconfig_notifier_unregister);

​

#ifdef DEBUG

const char *action_names[] = {

    [OF_RECONFIG_ATTACH_NODE] = "ATTACH_NODE",

    [OF_RECONFIG_DETACH_NODE] = "DETACH_NODE",

    [OF_RECONFIG_ADD_PROPERTY] = "ADD_PROPERTY",

    [OF_RECONFIG_REMOVE_PROPERTY] = "REMOVE_PROPERTY",

    [OF_RECONFIG_UPDATE_PROPERTY] = "UPDATE_PROPERTY",

};

#endif

​

int of_reconfig_notify(unsigned long action, struct of_reconfig_data *p)

{

    int rc;

#ifdef DEBUG

    struct of_reconfig_data *pr = p;

​

    switch (action) {

    case OF_RECONFIG_ATTACH_NODE:

    case OF_RECONFIG_DETACH_NODE:

        pr_debug("notify %-15s %pOF\n", action_names[action],

            pr->dn);

        break;

    case OF_RECONFIG_ADD_PROPERTY:

    case OF_RECONFIG_REMOVE_PROPERTY:

    case OF_RECONFIG_UPDATE_PROPERTY:

        pr_debug("notify %-15s %pOF:%s\n", action_names[action],

            pr->dn, pr->prop->name);