Commit bfe446e3 authored by Philipp Zabel's avatar Philipp Zabel
Browse files

of: Add of_graph_get_port_by_id function 



This patch adds a function to get a port device tree node by port id,
or reg property value.

Signed-off-by: default avatarPhilipp Zabel <p.zabel@pengutronix.de>
Acked-by: default avatarLaurent Pinchart <laurent.pinchart@ideasonboard.com>
parent ee890596

drivers/of/base.c

+32 −0
Original line number Diff line number Diff line
@@ -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

include/linux/of_graph.h

+7 −0
Original line number Diff line number Diff line
@@ -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)