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Subject[PATCH v3 08/17] of_graph: add of_graph_get_top_port()
Date

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>
---
v2 -> v3

- no change

drivers/of/base.c | 24 ++++++++++++++++++++++++
include/linux/of_graph.h | 2 ++
2 files changed, 26 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..ee823c6 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(
--
1.9.1
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