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Commit f1f207e4 authored by Rob Herring's avatar Rob Herring
Browse files

of: Add cpu node iterator for_each_of_cpu_node()



Iterating thru cpu nodes is a common pattern. Create a common iterator
which can find child nodes either by node name or device_type == cpu.
Using the former will allow for eventually dropping device_type
properties which are deprecated for FDT.

Cc: Frank Rowand <frowand.list@gmail.com>
Reviewed-by: default avatarGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: default avatarRob Herring <robh@kernel.org>
parent f6707fd6
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+39 −0
Original line number Diff line number Diff line
@@ -741,6 +741,45 @@ struct device_node *of_get_next_available_child(const struct device_node *node,
}
EXPORT_SYMBOL(of_get_next_available_child);

/**
 *	of_get_next_cpu_node - Iterate on cpu nodes
 *	@prev:	previous child of the /cpus node, or NULL to get first
 *
 *	Returns a cpu node pointer with refcount incremented, use of_node_put()
 *	on it when done. Returns NULL when prev is the last child. Decrements
 *	the refcount of prev.
 */
struct device_node *of_get_next_cpu_node(struct device_node *prev)
{
	struct device_node *next = NULL;
	unsigned long flags;
	struct device_node *node;

	if (!prev)
		node = of_find_node_by_path("/cpus");

	raw_spin_lock_irqsave(&devtree_lock, flags);
	if (prev)
		next = prev->sibling;
	else if (node) {
		next = node->child;
		of_node_put(node);
	}
	for (; next; next = next->sibling) {
		if (!(of_node_name_eq(next, "cpu") ||
		      (next->type && !of_node_cmp(next->type, "cpu"))))
			continue;
		if (!__of_device_is_available(next))
			continue;
		if (of_node_get(next))
			break;
	}
	of_node_put(prev);
	raw_spin_unlock_irqrestore(&devtree_lock, flags);
	return next;
}
EXPORT_SYMBOL(of_get_next_cpu_node);

/**
 * of_get_compatible_child - Find compatible child node
 * @parent:	parent node
+11 −0
Original line number Diff line number Diff line
@@ -353,6 +353,8 @@ extern const void *of_get_property(const struct device_node *node,
				const char *name,
				int *lenp);
extern struct device_node *of_get_cpu_node(int cpu, unsigned int *thread);
extern struct device_node *of_get_next_cpu_node(struct device_node *prev);

#define for_each_property_of_node(dn, pp) \
	for (pp = dn->properties; pp != NULL; pp = pp->next)

@@ -754,6 +756,11 @@ static inline struct device_node *of_get_cpu_node(int cpu,
	return NULL;
}

static inline struct device_node *of_get_next_cpu_node(struct device_node *prev)
{
	return NULL;
}

static inline int of_n_addr_cells(struct device_node *np)
{
	return 0;
@@ -1217,6 +1224,10 @@ static inline int of_property_read_s32(const struct device_node *np,
	for (child = of_get_next_available_child(parent, NULL); child != NULL; \
	     child = of_get_next_available_child(parent, child))

#define for_each_of_cpu_node(cpu) \
	for (cpu = of_get_next_cpu_node(NULL); cpu != NULL; \
	     cpu = of_get_next_cpu_node(cpu))

#define for_each_node_with_property(dn, prop_name) \
	for (dn = of_find_node_with_property(NULL, prop_name); dn; \
	     dn = of_find_node_with_property(dn, prop_name))