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of: base: Add for_each_child_of_node_with_prefix()

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There are cases where drivers would go through child device nodes and
operate on only the ones whose node name starts with a given prefix.

Provide a helper for these users. This will mainly be used in a
subsequent patch that implements a hardware component prober for I2C
busses.

Signed-off-by: Chen-Yu Tsai <wenst@chromium.org>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
This commit is contained in:
Chen-Yu Tsai 2024-11-06 17:33:29 +08:00 • committed by Wolfram Sang
parent 81de291d86
commit 1fcc67e3a3
2 changed files with 44 additions and 0 deletions
drivers/of
base.c
include/linux
of.h

35
drivers/of/base.c
View file

@ -644,6 +644,41 @@ struct device_node *of_get_next_child(const struct device_node *node,
}
EXPORT_SYMBOL(of_get_next_child);
/**
* of_get_next_child_with_prefix - Find the next child node with prefix
* @node: parent node
* @prev: previous child of the parent node, or NULL to get first
*
* This function is like of_get_next_child(), except that it automatically
* skips any nodes whose name doesn't have the given prefix.
*
* Return: A node pointer with refcount incremented, use
* of_node_put() on it when done.
*/
struct device_node *of_get_next_child_with_prefix(const struct device_node *node,
struct device_node *prev,
const char *prefix)
{
struct device_node *next;
unsigned long flags;
if (!node)
return NULL;
raw_spin_lock_irqsave(&devtree_lock, flags);
next = prev ? prev->sibling : node->child;
for (; next; next = next->sibling) {
if (!of_node_name_prefix(next, prefix))
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_child_with_prefix);
static struct device_node *of_get_next_status_child(const struct device_node *node,
struct device_node *prev,
bool (*checker)(const struct device_node *))

9
include/linux/of.h
View file

@ -289,6 +289,9 @@ extern struct device_node *of_get_parent(const struct device_node *node);
extern struct device_node *of_get_next_parent(struct device_node *node);
extern struct device_node *of_get_next_child(const struct device_node *node,
struct device_node *prev);
extern struct device_node *of_get_next_child_with_prefix(const struct device_node *node,
struct device_node *prev,
const char *prefix);
extern struct device_node *of_get_next_available_child(
const struct device_node *node, struct device_node *prev);
extern struct device_node *of_get_next_reserved_child(
@ -1468,6 +1471,12 @@ static inline int of_property_read_s32(const struct device_node *np,
child != NULL; \
child = of_get_next_child(parent, child))
#define for_each_child_of_node_with_prefix(parent, child, prefix) \
for (struct device_node *child __free(device_node) = \
of_get_next_child_with_prefix(parent, NULL, prefix); \
child != NULL; \
child = of_get_next_child_with_prefix(parent, child, prefix))
#define for_each_available_child_of_node(parent, child) \
for (child = of_get_next_available_child(parent, NULL); child != NULL; \
child = of_get_next_available_child(parent, child))