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@@ -0,0 +1,106 @@
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+/*
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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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+
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+#ifndef _DM_OF_H
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+#define _DM_OF_H
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+
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+#include <asm/u-boot.h>
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+#include <asm/global_data.h>
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+
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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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+/**
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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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+/**
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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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+
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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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+
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+#define OF_MAX_PHANDLE_ARGS 16
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+
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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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+
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+DECLARE_GLOBAL_DATA_PTR;
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+
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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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+
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+#endif
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