Add of_get_non_port_child() helper that can be used to lookup non port child nodes.
Some OF graphs don't require 'ports' to represent the next output instead, it simply adds a child node on a given parent node. This helper lookup that child node, however that child node is not a 'port' on given parent as 'port' based nodes are looked up via of_graph_get_remote_node().
Example OF graph representation of DSI host, which doesn't have 'ports'.
dsi { #address-cells = <1>; #size-cells = <0>;
port { dsi_in_tcon0: endpoint { remote-endpoint = <tcon0_out_dsi>; };
panel@0 { reg = <0>; }; };
Signed-off-by: Jagan Teki jagan@amarulasolutions.com --- drivers/of/base.c | 29 +++++++++++++++++++++++++++++ include/linux/of.h | 6 ++++++ 2 files changed, 35 insertions(+)
diff --git a/drivers/of/base.c b/drivers/of/base.c index 61de453b885c..31bbf885b0f8 100644 --- a/drivers/of/base.c +++ b/drivers/of/base.c @@ -854,6 +854,35 @@ struct device_node *of_get_compatible_child(const struct device_node *parent, } EXPORT_SYMBOL(of_get_compatible_child);
+/** + * of_get_non_port_child - Find the non port child node for a given parent + * @node: parent node + * + * This function looks for child node which is not port child for given parent. + * + * Return: A node pointer if found, with refcount incremented, use + * of_node_put() on it when done. + * Returns NULL if node is not found. + */ +struct device_node *of_get_non_port_child(const struct device_node *parent) +{ + struct device_node *child; + + for_each_child_of_node(parent, child) { + if (of_node_name_eq(child, "port")) + continue; + + if (!of_device_is_available(child)) { + of_node_put(child); + continue; + } + break; + } + + return child; +} +EXPORT_SYMBOL(of_get_non_port_child); + /** * of_get_child_by_name - Find the child node by name for a given parent * @node: parent node diff --git a/include/linux/of.h b/include/linux/of.h index ff143a027abc..3e699becef82 100644 --- a/include/linux/of.h +++ b/include/linux/of.h @@ -290,6 +290,7 @@ extern struct device_node *of_get_next_child(const struct device_node *node, extern struct device_node *of_get_next_available_child( const struct device_node *node, struct device_node *prev);
+extern struct device_node *of_get_non_port_child(const struct device_node *parent); extern struct device_node *of_get_compatible_child(const struct device_node *parent, const char *compatible); extern struct device_node *of_get_child_by_name(const struct device_node *node, @@ -678,6 +679,11 @@ static inline bool of_have_populated_dt(void) return false; }
+static inline struct device_node *of_get_non_port_child(const struct device_node *parent) +{ + return NULL; +} + static inline struct device_node *of_get_compatible_child(const struct device_node *parent, const char *compatible) {