[PATCH] ppc64: base support for dynamic update of OF device, tree from Nathan Lynch

From: Anton Blanchard <anton@samba.org>

base support for dynamic update of OF device, tree from Nathan Lynch

include/asm-ppc64/prom.h

@@ -14,6 +14,8 @@
  * as published by the Free Software Foundation; either version
  * 2 of the License, or (at your option) any later version.
  */
+#include <linux/proc_fs.h>
+#include <asm/atomic.h>
 
 #define PTRRELOC(x)     ((typeof(x))((unsigned long)(x) - offset))
 #define PTRUNRELOC(x)   ((typeof(x))((unsigned long)(x) + offset))
@@ -144,8 +146,44 @@ struct device_node {
 	struct	device_node *sibling;
 	struct	device_node *next;	/* next device of same type */
 	struct	device_node *allnext;	/* next in list of all nodes */
+	struct  proc_dir_entry *pde;       /* this node's proc directory */
+	struct  proc_dir_entry *name_link; /* name symlink */
+	struct  proc_dir_entry *addr_link; /* addr symlink */
+	atomic_t _users;                 /* reference count */
+	unsigned long _flags;
 };
 
+/* flag descriptions */
+#define OF_STALE   0 /* node is slated for deletion */
+#define OF_DYNAMIC 1 /* node and properties were allocated via kmalloc */
+
+#define OF_IS_STALE(x) test_bit(OF_STALE, &x->_flags)
+#define OF_MARK_STALE(x) set_bit(OF_STALE, &x->_flags)
+#define OF_IS_DYNAMIC(x) test_bit(OF_DYNAMIC, &x->_flags)
+#define OF_MARK_DYNAMIC(x) set_bit(OF_DYNAMIC, &x->_flags)
+
+/*
+ * Until 32-bit ppc can add proc_dir_entries to its device_node
+ * definition, we cannot refer to pde, name_link, and addr_link
+ * in arch-independent code.
+ */
+#define HAVE_ARCH_DEVTREE_FIXUPS
+
+static inline void set_node_proc_entry(struct device_node *dn, struct proc_dir_entry *de)
+{
+	dn->pde = de;
+}
+
+static void inline set_node_name_link(struct device_node *dn, struct proc_dir_entry *de)
+{
+	dn->name_link = de;
+}
+
+static void inline set_node_addr_link(struct device_node *dn, struct proc_dir_entry *de)
+{
+	dn->addr_link = de;
+}
+
 typedef u32 prom_arg_t;
 
 struct prom_args {
@@ -196,6 +234,10 @@ extern struct device_node *of_get_next_child(const struct device_node *node,
 extern struct device_node *of_node_get(struct device_node *node);
 extern void of_node_put(struct device_node *node);
 
+/* For updating the device tree at runtime */
+extern int of_add_node(const char *path, struct property *proplist);
+extern int of_remove_node(struct device_node *np);
+
 /* Other Prototypes */
 extern void abort(void);
 extern unsigned long prom_init(unsigned long, unsigned long, unsigned long,