linux-imx

// SPDX-License-Identifier: GPL-2.0+

/*

 * Procedures for creating, accessing and interpreting the device tree.

 *

 * Paul Mackerras   August 1996.

 * Copyright (C) 1996-2005 Paul Mackerras.

 *

 *  Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.

 *    {engebret|bergner}@us.ibm.com

 *

 *  Adapted for sparc and sparc64 by David S. Miller davem@davemloft.net

 *

 *  Reconsolidated from arch/x/kernel/prom.c by Stephen Rothwell and

 *  Grant Likely.

 */

​

#define pr_fmt(fmt) "OF: " fmt

​

#include <linux/bitmap.h>

#include <linux/console.h>

#include <linux/ctype.h>

#include <linux/cpu.h>

#include <linux/module.h>

#include <linux/of.h>

#include <linux/of_device.h>

#include <linux/of_graph.h>

#include <linux/spinlock.h>

#include <linux/slab.h>

#include <linux/string.h>

#include <linux/proc_fs.h>

​

#include "of_private.h"

​

LIST_HEAD(aliases_lookup);

​

struct device_node *of_root;

EXPORT_SYMBOL(of_root);

struct device_node *of_chosen;

struct device_node *of_aliases;

struct device_node *of_stdout;

static const char *of_stdout_options;

​

struct kset *of_kset;

​

/*

 * Used to protect the of_aliases, to hold off addition of nodes to sysfs.

 * This mutex must be held whenever modifications are being made to the

 * device tree. The of_{attach,detach}_node() and

 * of_{add,remove,update}_property() helpers make sure this happens.

 */

DEFINE_MUTEX(of_mutex);

​

/* use when traversing tree through the child, sibling,

 * or parent members of struct device_node.

 */

DEFINE_RAW_SPINLOCK(devtree_lock);

​

bool of_node_name_eq(const struct device_node *np, const char *name)

{

    const char *node_name;

    size_t len;

​

    if (!np)