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