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Subject[RFC PATCH 3/3] of: Add OF graph helpers to iterate over ports
Date
This patch adds the of_graph_get_next_port function and a for_each_port_of_node
macro using it. This allows to iterate over all ports of a given device node.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
---
drivers/of/base.c | 47 +++++++++++++++++++++++++++++++++++++++++++++++
include/linux/of_graph.h | 12 ++++++++++++
2 files changed, 59 insertions(+)

diff --git a/drivers/of/base.c b/drivers/of/base.c
index 7ecffbe..364042b 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -2128,6 +2128,53 @@ struct device_node *of_graph_get_port_by_id(struct device_node *node, int id)
EXPORT_SYMBOL(of_graph_get_port_by_id);

/**
+ * of_graph_get_next_port() - get next port node
+ *
+ * @parent: pointer to the parent device node
+ * @prev: previous port node, or NULL to get first
+ *
+ * Return: A 'port' node pointer with refcount incremented. The caller
+ * has to use of_node_put() on it when done.
+ */
+
+struct device_node *of_graph_get_next_port(const struct device_node *parent,
+ struct device_node *prev)
+{
+ struct of_graph_entity *entity;
+ struct of_graph_port *port;
+
+ if (!parent)
+ return NULL;
+
+ entity = __of_graph_lookup_entity(parent);
+ if (WARN_ONCE(!entity || list_empty(&entity->ports),
+ "%s(): no ports specified for %s\n",
+ __func__, parent->full_name))
+ return NULL;
+
+ if (!prev) {
+ /* It's the first call, we have to find the first port. */
+ port = list_first_entry(&entity->ports,
+ struct of_graph_port, list);
+
+ return of_node_get(port->of_node);
+ }
+
+ of_node_put(prev);
+
+ list_for_each_entry(port, &entity->ports, list) {
+ if (port->of_node == prev &&
+ port != list_last_entry(&entity->ports,
+ struct of_graph_port, list)) {
+ port = list_next_entry(port, list);
+ return of_node_get(port->of_node);
+ }
+ }
+
+ return NULL;
+}
+
+/**
* of_graph_get_next_endpoint() - get next endpoint node
*
* @parent: pointer to the parent device node
diff --git a/include/linux/of_graph.h b/include/linux/of_graph.h
index 2701054..7ed0bfa 100644
--- a/include/linux/of_graph.h
+++ b/include/linux/of_graph.h
@@ -26,6 +26,9 @@ struct of_endpoint {
const struct device_node *local_node;
};

+#define for_each_port_of_node(dn, pp) \
+ for (pp = of_graph_get_next_port(dn, NULL); pp != NULL; \
+ pp = of_graph_get_next_port(dn, pp))
#define for_each_endpoint_of_node(dn, ep) \
for (ep = of_graph_get_next_endpoint(dn, NULL); ep != NULL; \
ep = of_graph_get_next_endpoint(dn, ep))
@@ -34,6 +37,8 @@ struct of_endpoint {
int of_graph_parse_endpoint(const struct device_node *node,
struct of_endpoint *endpoint);
struct device_node *of_graph_get_port_by_id(struct device_node *node, int id);
+struct device_node *of_graph_get_next_port(const struct device_node *parent,
+ struct device_node *previous);
struct device_node *of_graph_get_next_endpoint(const struct device_node *parent,
struct device_node *previous);
struct device_node *of_graph_get_remote_port_parent(
@@ -56,6 +61,13 @@ static inline struct device_node *of_graph_get_port_by_id(struct device_node *no
return NULL;
}

+static inline struct device_node *of_graph_get_next_port(
+ const struct device_node *parent,
+ struct device_node *previous)
+{
+ return NULL;
+}
+
static inline struct device_node *of_graph_get_next_endpoint(
const struct device_node *parent,
struct device_node *previous)
--
1.9.0


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