of.h
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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
#define OF_BAD_ADDR ((u64)-1)
static inline const char *of_node_full_name(const struct device_node *np)
{
return np ? np->full_name : "<no-node>";
}
/* Default #address and #size cells */
#if !defined(OF_ROOT_NODE_ADDR_CELLS_DEFAULT)
#define OF_ROOT_NODE_ADDR_CELLS_DEFAULT 1
#define OF_ROOT_NODE_SIZE_CELLS_DEFAULT 1
#endif
/* Default string compare functions */
#if !defined(of_compat_cmp)
#define of_compat_cmp(s1, s2, l) strcasecmp((s1), (s2))
#define of_prop_cmp(s1, s2) strcmp((s1), (s2))
#define of_node_cmp(s1, s2) strcasecmp((s1), (s2))
#endif
/* Helper to read a big number; size is in cells (not bytes) */
static inline u64 of_read_number(const __be32 *cell, int size)
{
u64 r = 0;
while (size--)
r = (r << 32) | be32_to_cpu(*(cell++));
return r;
}
/* Like of_read_number, but we want an unsigned long result */
static inline unsigned long of_read_ulong(const __be32 *cell, int size)
{
/* toss away upper bits if unsigned long is smaller than u64 */
return of_read_number(cell, size);
}
#endif