From patchwork Tue Dec 23 13:09:18 2014
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From: Philipp Zabel
To: Grant Likely
Subject: [PATCH v7 3/3] of: Add of_graph_get_port_by_id function
Date: Tue, 23 Dec 2014 14:09:18 +0100
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Cc: Mathieu Poirier ,
Greg Kroah-Hartman ,
linux-kernel@vger.kernel.org,
dri-devel@lists.freedesktop.org, Andrzej Hajda ,
Tomi Valkeinen ,
Laurent Pinchart ,
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This patch adds a function to get a port device tree node by port id,
or reg property value.
Signed-off-by: Philipp Zabel
Acked-by: Laurent Pinchart
---
Changes since v6:
- Fixed of_graph_get_port_by_id to handle the optional 'ports' node
and synchronize documentation and parameter names in the process,
spotted by Andrzej Hajda.
---
drivers/of/base.c | 32 ++++++++++++++++++++++++++++++++
include/linux/of_graph.h | 7 +++++++
2 files changed, 39 insertions(+)
diff --git a/drivers/of/base.c b/drivers/of/base.c
index aac66df..8389215 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -2080,6 +2080,38 @@ int of_graph_parse_endpoint(const struct device_node *node,
EXPORT_SYMBOL(of_graph_parse_endpoint);
/**
+ * of_graph_get_port_by_id() - get the port matching a given id
+ * @parent: pointer to the parent device node
+ * @id: id of the port
+ *
+ * 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_port_by_id(struct device_node *parent, u32 id)
+{
+ struct device_node *node, *port;
+
+ node = of_get_child_by_name(parent, "ports");
+ if (node)
+ parent = node;
+
+ for_each_child_of_node(parent, port) {
+ u32 port_id = 0;
+
+ if (of_node_cmp(port->name, "port") != 0)
+ continue;
+ of_property_read_u32(port, "reg", &port_id);
+ if (id == port_id)
+ break;
+ }
+
+ of_node_put(node);
+
+ return port;
+}
+EXPORT_SYMBOL(of_graph_get_port_by_id);
+
+/**
* 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 e43442e..3c1c95a 100644
--- a/include/linux/of_graph.h
+++ b/include/linux/of_graph.h
@@ -40,6 +40,7 @@ struct of_endpoint {
#ifdef CONFIG_OF
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_next_endpoint(const struct device_node *parent,
struct device_node *previous);
struct device_node *of_graph_get_remote_port_parent(
@@ -53,6 +54,12 @@ static inline int of_graph_parse_endpoint(const struct device_node *node,
return -ENOSYS;
}
+static inline struct device_node *of_graph_get_port_by_id(
+ struct device_node *node, u32 id)
+{
+ return NULL;
+}
+
static inline struct device_node *of_graph_get_next_endpoint(
const struct device_node *parent,
struct device_node *previous)