From: Kuninori Morimoto kuninori.morimoto.gx@renesas.com
driver want to get top level of port[s] node. This patch adds of_graph_get_top_port() for this purpose
Signed-off-by: Kuninori Morimoto kuninori.morimoto.gx@renesas.com --- v3 -> v4
- care non-OF case
drivers/of/base.c | 24 ++++++++++++++++++++++++ include/linux/of_graph.h | 7 +++++++ 2 files changed, 31 insertions(+)
diff --git a/drivers/of/base.c b/drivers/of/base.c index fed0b023..e49eb28 100644 --- a/drivers/of/base.c +++ b/drivers/of/base.c @@ -2330,6 +2330,30 @@ struct device_node *of_graph_get_port_by_id(struct device_node *parent, u32 id) EXPORT_SYMBOL(of_graph_get_port_by_id);
/** + * of_graph_get_top_port() - get the top port node + * @dev: pointer to the device + * + * 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_top_port(struct device *dev) +{ + struct device_node *np = dev->of_node; + struct device_node *node; + + node = of_get_child_by_name(np, "ports"); + if (node) + return node; + + node = of_get_child_by_name(np, "port"); + if (node) + return node; + + return NULL; +} +EXPORT_SYMBOL(of_graph_get_top_port); + +/** * of_graph_get_next_endpoint() - get next endpoint node * @parent: pointer to the parent device node * @prev: previous endpoint node, or NULL to get first diff --git a/include/linux/of_graph.h b/include/linux/of_graph.h index 80ced0c..23b1c6e 100644 --- a/include/linux/of_graph.h +++ b/include/linux/of_graph.h @@ -14,6 +14,7 @@ #ifndef __LINUX_OF_GRAPH_H #define __LINUX_OF_GRAPH_H
+#include <linux/device.h> #include <linux/types.h> #include <linux/errno.h>
@@ -44,6 +45,7 @@ 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, u32 id); +struct device_node *of_graph_get_top_port(struct device *dev); struct device_node *of_graph_get_next_endpoint(const struct device_node *parent, struct device_node *previous); struct device_node *of_graph_get_endpoint_by_regs( @@ -68,6 +70,11 @@ static inline struct device_node *of_graph_get_port_by_id( return NULL; }
+static inline struct device_node *of_graph_get_top_port(struct device *dev) +{ + return NULL; +} + static inline struct device_node *of_graph_get_next_endpoint( const struct device_node *parent, struct device_node *previous)