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Subject[PATCH v4 02/12] of_graph: add of_graph_get_port_parent()
Date

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 810acf4..fed0b023 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -2439,6 +2439,27 @@ 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
*
@@ -2449,18 +2470,11 @@ 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 d9d6d9c..80ced0c 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);
@@ -86,6 +87,12 @@ 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)
{
--
1.9.1
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