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 <[email protected]> --- 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 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
