Revert "dt: add of_alias_scan and of_alias_get_id"

This reverts commit 750f463a.

of_alias_* still needs work to be generalized for 'promtree' dt
platforms, and to no implicitly create entries for available ids.
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

drivers/of/base.c

@@ -17,39 +17,14 @@
  *      as published by the Free Software Foundation; either version
  *      2 of the License, or (at your option) any later version.
  */
-#include <linux/ctype.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/spinlock.h>
 #include <linux/slab.h>
 #include <linux/proc_fs.h>
 
-/**
- * struct alias_prop - Alias property in 'aliases' node
- * @link:	List node to link the structure in aliases_lookup list
- * @alias:	Alias property name
- * @np:		Pointer to device_node that the alias stands for
- * @id:		Index value from end of alias name
- * @stem:	Alias string without the index
- *
- * The structure represents one alias property of 'aliases' node as
- * an entry in aliases_lookup list.
- */
-struct alias_prop {
-	struct list_head link;
-	const char *alias;
-	struct device_node *np;
-	int id;
-	char stem[0];
-};
-
-static LIST_HEAD(aliases_lookup);
-
 struct device_node *allnodes;
 struct device_node *of_chosen;
-struct device_node *of_aliases;
-
-static DEFINE_MUTEX(of_aliases_mutex);
 
 /* use when traversing tree through the allnext, child, sibling,
  * or parent members of struct device_node.
@@ -1013,108 +988,3 @@ void of_detach_node(struct device_node *np)
 }
 #endif /* defined(CONFIG_OF_DYNAMIC) */
 
-static void of_alias_add(struct alias_prop *ap, struct device_node *np,
-			 int id, const char *stem, int stem_len)
-{
-	ap->id = id;
-	ap->np = np;
-	strncpy(ap->stem, stem, stem_len);
-	ap->stem[stem_len] = 0;
-	list_add_tail(&ap->link, &aliases_lookup);
-	pr_debug("adding DT alias:%s: stem=%s id=%i node=%s\n",
-		 ap->alias, ap->stem, ap->id, np ? np->full_name : NULL);
-}
-
-/**
- * of_alias_scan() - Scan all properties of 'aliases' node
- *
- * The function scans all the properties of 'aliases' node and populate
- * the global lookup table with the properties.  It returns the
- * number of alias_prop found, or error code in error case.
- */
-__init void of_alias_scan(void)
-{
-	struct property *pp;
-
-	if (!of_aliases)
-		return;
-
-	for_each_property(pp, of_aliases->properties) {
-		const char *start = pp->name;
-		const char *end = start + strlen(start);
-		struct device_node *np;
-		struct alias_prop *ap;
-		int id, len;
-
-		/* Skip those we do not want to proceed */
-		if (!strcmp(pp->name, "name") ||
-		    !strcmp(pp->name, "phandle") ||
-		    !strcmp(pp->name, "linux,phandle"))
-			continue;
-
-		np = of_find_node_by_path(pp->value);
-		if (!np)
-			continue;
-
-		/* walk alias backwards to extract the id and 'stem' string */
-		while (isdigit(*(end-1)) && end > start)
-			end--;
-		len = end - start;
-		id = strlen(end) ? simple_strtoul(end, NULL, 10) : -1;
-
-		/* Allocate an alias_prop with enough space for the stem */
-		ap = early_init_dt_alloc_memory_arch(sizeof(*ap) + len + 1, 4);
-		if (!ap)
-			continue;
-		ap->alias = start;
-		of_alias_add(ap, np, id, start, len);
-	}
-}
-
-/**
- * of_alias_get_id() - Get alias id for the given device_node
- * @np:		Pointer to the given device_node
- * @stem:	Alias stem of the given device_node
- *
- * The function travels the lookup table to get alias id for the given
- * device_node and alias stem.  It returns the alias id if find it.
- * If not, dynamically creates one in the lookup table and returns it,
- * or returns error code if fail to create.
- */
-int of_alias_get_id(struct device_node *np, const char *stem)
-{
-	struct alias_prop *app;
-	int id = 0;
-	bool found = false;
-
-	mutex_lock(&of_aliases_mutex);
-	list_for_each_entry(app, &aliases_lookup, link) {
-		if (strcmp(app->stem, stem) != 0)
-			continue;
-
-		if (np == app->np) {
-			found = true;
-			id = app->id;
-			break;
-		}
-
-		if (id <= app->id)
-			id = app->id + 1;
-	}
-
-	/* If an id is not found, then allocate a new one */
-	if (!found) {
-		app = kzalloc(sizeof(*app) + strlen(stem) + 1, 4);
-		if (!app) {
-			id = -ENODEV;
-			goto out;
-		}
-		of_alias_add(app, np, id, stem, strlen(stem));
-	}
-
- out:
-	mutex_unlock(&of_aliases_mutex);
-
-	return id;
-}
-EXPORT_SYMBOL_GPL(of_alias_get_id);

drivers/of/fdt.c

@@ -707,12 +707,10 @@ void __init unflatten_device_tree(void)
 	__unflatten_device_tree(initial_boot_params, &allnodes,
 				early_init_dt_alloc_memory_arch);
 
-	/* Get pointer to "/chosen" and "/aliasas" nodes for use everywhere */
+	/* Get pointer to OF "/chosen" node for use everywhere */
 	of_chosen = of_find_node_by_path("/chosen");
 	if (of_chosen == NULL)
 		of_chosen = of_find_node_by_path("/chosen@0");
-	of_aliases = of_find_node_by_path("/aliases");
-	of_alias_scan();
 }
 
 #endif /* CONFIG_OF_EARLY_FLATTREE */

include/linux/of.h

@@ -68,7 +68,6 @@ struct device_node {
 /* Pointer for first entry in chain of all nodes. */
 extern struct device_node *allnodes;
 extern struct device_node *of_chosen;
-extern struct device_node *of_aliases;
 extern rwlock_t devtree_lock;
 
 static inline bool of_have_populated_dt(void)
@@ -210,9 +209,6 @@ extern int of_device_is_available(const struct device_node *device);
 extern const void *of_get_property(const struct device_node *node,
 				const char *name,
 				int *lenp);
-#define for_each_property(pp, properties) \
-	for (pp = properties; pp != NULL; pp = pp->next)
-
 extern int of_n_addr_cells(struct device_node *np);
 extern int of_n_size_cells(struct device_node *np);
 extern const struct of_device_id *of_match_node(
@@ -225,10 +221,6 @@ extern int of_parse_phandles_with_args(struct device_node *np,
 	const char *list_name, const char *cells_name, int index,
 	struct device_node **out_node, const void **out_args);
 
-extern void *early_init_dt_alloc_memory_arch(u64 size, u64 align);
-extern void of_alias_scan(void);
-extern int of_alias_get_id(struct device_node *np, const char *stem);
-
 extern int of_machine_is_compatible(const char *compat);
 
 extern int prom_add_property(struct device_node* np, struct property* prop);

include/linux/of_fdt.h

@@ -97,6 +97,7 @@ extern void early_init_dt_check_for_initrd(unsigned long node);
 extern int early_init_dt_scan_memory(unsigned long node, const char *uname,
 				     int depth, void *data);
 extern void early_init_dt_add_memory_arch(u64 base, u64 size);
+extern void * early_init_dt_alloc_memory_arch(u64 size, u64 align);
 extern u64 dt_mem_next_cell(int s, __be32 **cellp);
 
 /*