From: Kuninori Morimoto kuninori.morimoto.gx@renesas.com
Linux kernel already has of_graph_get_remote_port_parent(), but, sometimes we want to get own port parent. This patch adds of_graph_get_port_parent()
Signed-off-by: Kuninori Morimoto kuninori.morimoto.gx@renesas.com --- v3 -> v4
- no change
drivers/of/base.c | 30 ++++++++++++++++++++++-------- include/linux/of_graph.h | 7 +++++++ 2 files changed, 29 insertions(+), 8 deletions(-)
diff --git a/drivers/of/base.c b/drivers/of/base.c index 3fad47f..eac37014 100644 --- a/drivers/of/base.c +++ b/drivers/of/base.c @@ -2469,6 +2469,27 @@ struct device_node *of_graph_get_remote_endpoint(const struct device_node *node) EXPORT_SYMBOL(of_graph_get_remote_endpoint);
/** + * of_graph_get_port_parent() - get port's parent node + * @node: pointer to a local endpoint device_node + * + * Return: device node associated with endpoint node linked + * to @node. Use of_node_put() on it when done. + */ +struct device_node *of_graph_get_port_parent(struct device_node *node) +{ + unsigned int depth; + + /* Walk 3 levels up only if there is 'ports' node. */ + for (depth = 3; depth && node; depth--) { + node = of_get_next_parent(node); + if (depth == 2 && of_node_cmp(node->name, "ports")) + break; + } + return node; +} +EXPORT_SYMBOL(of_graph_get_port_parent); + +/** * of_graph_get_remote_port_parent() - get remote port's parent node * @node: pointer to a local endpoint device_node * @@ -2479,18 +2500,11 @@ struct device_node *of_graph_get_remote_port_parent( const struct device_node *node) { struct device_node *np; - unsigned int depth;
/* Get remote endpoint node. */ np = of_graph_get_remote_endpoint(node);
- /* Walk 3 levels up only if there is 'ports' node. */ - for (depth = 3; depth && np; depth--) { - np = of_get_next_parent(np); - if (depth == 2 && of_node_cmp(np->name, "ports")) - break; - } - return np; + return of_graph_get_port_parent(np); } EXPORT_SYMBOL(of_graph_get_remote_port_parent);
diff --git a/include/linux/of_graph.h b/include/linux/of_graph.h index 0c9473a..9db632d 100644 --- a/include/linux/of_graph.h +++ b/include/linux/of_graph.h @@ -50,6 +50,7 @@ struct device_node *of_graph_get_endpoint_by_regs( const struct device_node *parent, int port_reg, int reg); struct device_node *of_graph_get_remote_endpoint( const struct device_node *node); +struct device_node *of_graph_get_port_parent(struct device_node *node); struct device_node *of_graph_get_remote_port_parent( const struct device_node *node); struct device_node *of_graph_get_remote_port(const struct device_node *node); @@ -88,6 +89,12 @@ static inline struct device_node *of_graph_get_remote_endpoint( return NULL; }
+static inline struct device_node *of_graph_get_port_parent( + struct device_node *node) +{ + return NULL; +} + static inline struct device_node *of_graph_get_remote_port_parent( const struct device_node *node) {