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/*
* Copyright (c) 2017 Google, Inc
* Written by Simon Glass <sjg@chromium.org>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#ifndef _DM_OF_H
#define _DM_OF_H
#include <asm/u-boot.h>
#include <asm/global_data.h>
/* integer value within a device tree property which references another node */
typedef u32 phandle;
/**
* struct property: Device tree property
*
* @name: Property name
* @length: Length of property in bytes
* @value: Pointer to property value
* @next: Pointer to next property, or NULL if none
*/
struct property {
char *name;
int length;
void *value;
struct property *next;
};
/**
* struct device_node: Device tree node
*
* @name: Node name
* @type: Node type (value of device_type property) or "<NULL>" if none
* @phandle: Phandle value of this none, or 0 if none
* @full_name: Full path to node, e.g. "/bus@1/spi@1100"
* @properties: Pointer to head of list of properties, or NULL if none
* @parent: Pointer to parent node, or NULL if this is the root node
* @child: Pointer to head of child node list, or NULL if no children
* @sibling: Pointer to the next sibling node, or NULL if this is the last
*/
struct device_node {
const char *name;
const char *type;
phandle phandle;
const char *full_name;
struct property *properties;
struct device_node *parent;
struct device_node *child;
struct device_node *sibling;
};
#define OF_MAX_PHANDLE_ARGS 16
/**
* struct of_phandle_args - structure to hold phandle and arguments
*
* This is used when decoding a phandle in a device tree property. Typically
* these look like this:
*
* wibble {
* phandle = <5>;
* };
*
* ...
* some-prop = <&wibble 1 2 3>
*
* Here &node is the phandle of the node 'wibble', i.e. 5. There are three
* arguments: 1, 2, 3.
*
* So when decoding the phandle in some-prop, np will point to wibble,
* args_count will be 3 and the three arguments will be in args.
*
* @np: Node that the phandle refers to
* @args_count: Number of arguments
* @args: Argument values
*/
struct of_phandle_args {
struct device_node *np;
int args_count;
uint32_t args[OF_MAX_PHANDLE_ARGS];
};
DECLARE_GLOBAL_DATA_PTR;
/**
* of_live_active() - check if livetree is active
*
* @returns true if livetree is active, false it not
*/
#ifdef CONFIG_OF_LIVE
static inline bool of_live_active(void)
{
return gd->of_root != NULL;
}
#else
static inline bool of_live_active(void)
{
return false;
}
#endif
#endif
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