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UPSTREAM: of: introduce of_graph_get_remote_node

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The OF graph API leaves too much of the graph walking to clients when
in many cases the driver doesn't care about accessing the port or
endpoint nodes. The drivers typically just want the device connected via
a particular graph connection. of_graph_get_remote_node provides this
functionality.

(cherry picked from commit b85ad49409)

Change-Id: Iaee6a0f3c176d43d4bc6225f195aaaff1e7b419a
Signed-off-by: Rob Herring <robh@kernel.org>
Acked-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Mark Yao <mark.yao@rock-chips.com>
This commit is contained in:
Rob Herring 2017-02-03 12:39:03 -06:00 committed by Tao Huang
parent 4eb94cdf60
commit b5a7bc3996
2 changed files with 45 additions and 0 deletions
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37
drivers/of/base.c
View File

@ -2310,3 +2310,40 @@ struct device_node *of_graph_get_remote_port(const struct device_node *node)
return of_get_next_parent(np);
}
EXPORT_SYMBOL(of_graph_get_remote_port);
/**
* of_graph_get_remote_node() - get remote parent device_node for given port/endpoint
* @node: pointer to parent device_node containing graph port/endpoint
* @port: identifier (value of reg property) of the parent port node
* @endpoint: identifier (value of reg property) of the endpoint node
*
* Return: Remote device node associated with remote endpoint node linked
* to @node. Use of_node_put() on it when done.
*/
struct device_node *of_graph_get_remote_node(const struct device_node *node,
u32 port, u32 endpoint)
{
struct device_node *endpoint_node, *remote;
endpoint_node = of_graph_get_endpoint_by_regs(node, port, endpoint);
if (!endpoint_node) {
pr_debug("no valid endpoint (%d, %d) for node %s\n",
port, endpoint, node->full_name);
return NULL;
}
remote = of_graph_get_remote_port_parent(endpoint_node);
of_node_put(endpoint_node);
if (!remote) {
pr_debug("no valid remote node\n");
return NULL;
}
if (!of_device_is_available(remote)) {
pr_debug("not available for remote node\n");
return NULL;
}
return remote;
}
EXPORT_SYMBOL(of_graph_get_remote_node);

8
include/linux/of_graph.h
View File

@ -50,6 +50,8 @@ struct device_node *of_graph_get_endpoint_by_regs(
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);
struct device_node *of_graph_get_remote_node(const struct device_node *node,
u32 port, u32 endpoint);
#else
static inline int of_graph_parse_endpoint(const struct device_node *node,
@ -88,6 +90,12 @@ static inline struct device_node *of_graph_get_remote_port(
{
return NULL;
}
static inline struct device_node *of_graph_get_remote_node(
const struct device_node *node,
u32 port, u32 endpoint)
{
return NULL;
}
#endif /* CONFIG_OF */