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Commit 07bb80d4 authored by Mika Westerberg's avatar Mika Westerberg Committed by Rafael J. Wysocki
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device property: Add support for remote endpoints 



This follows DT implementation of of_graph_* APIs but we call them
fwnode_graph_* instead. For DT nodes the existing of_graph_* implementation
will be used. For ACPI we use the new ACPI graph implementation instead.

Signed-off-by: default avatarMika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: default avatarSakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 79389a83

drivers/base/property.c

+123 −0
Original line number Diff line number Diff line
@@ -15,6 +15,7 @@ 
#include <linux/kernel.h>

#include <linux/of.h>

#include <linux/of_address.h>

#include <linux/of_graph.h>

#include <linux/property.h>

#include <linux/etherdevice.h>

#include <linux/phy.h>
@@ -1176,3 +1177,125 @@ void *device_get_mac_address(struct device *dev, char *addr, int alen) 
	return device_get_mac_addr(dev, "address", addr, alen);

}

EXPORT_SYMBOL(device_get_mac_address);



/**

 * device_graph_get_next_endpoint - Get next endpoint firmware node

 * @fwnode: Pointer to the parent firmware node

 * @prev: Previous endpoint node or %NULL to get the first

 *

 * Returns an endpoint firmware node pointer or %NULL if no more endpoints

 * are available.

 */

struct fwnode_handle *

fwnode_graph_get_next_endpoint(struct fwnode_handle *fwnode,

			       struct fwnode_handle *prev)

{

	struct fwnode_handle *endpoint = NULL;



	if (is_of_node(fwnode)) {

		struct device_node *node;



		node = of_graph_get_next_endpoint(to_of_node(fwnode),

						  to_of_node(prev));



		if (node)

			endpoint = &node->fwnode;

	} else if (is_acpi_node(fwnode)) {

		endpoint = acpi_graph_get_next_endpoint(fwnode, prev);

		if (IS_ERR(endpoint))

			endpoint = NULL;

	}



	return endpoint;



}

EXPORT_SYMBOL_GPL(fwnode_graph_get_next_endpoint);



/**

 * fwnode_graph_get_remote_port_parent - Return fwnode of a remote device

 * @fwnode: Endpoint firmware node pointing to the remote endpoint

 *

 * Extracts firmware node of a remote device the @fwnode points to.

 */

struct fwnode_handle *

fwnode_graph_get_remote_port_parent(struct fwnode_handle *fwnode)

{

	struct fwnode_handle *parent = NULL;



	if (is_of_node(fwnode)) {

		struct device_node *node;



		node = of_graph_get_remote_port_parent(to_of_node(fwnode));

		if (node)

			parent = &node->fwnode;

	} else if (is_acpi_node(fwnode)) {

		int ret;



		ret = acpi_graph_get_remote_endpoint(fwnode, &parent, NULL,

						     NULL);

		if (ret)

			return NULL;

	}



	return parent;

}

EXPORT_SYMBOL_GPL(fwnode_graph_get_remote_port_parent);



/**

 * fwnode_graph_get_remote_port - Return fwnode of a remote port

 * @fwnode: Endpoint firmware node pointing to the remote endpoint

 *

 * Extracts firmware node of a remote port the @fwnode points to.

 */

struct fwnode_handle *fwnode_graph_get_remote_port(struct fwnode_handle *fwnode)

{

	struct fwnode_handle *port = NULL;



	if (is_of_node(fwnode)) {

		struct device_node *node;



		node = of_graph_get_remote_port(to_of_node(fwnode));

		if (node)

			port = &node->fwnode;

	} else if (is_acpi_node(fwnode)) {

		int ret;



		ret = acpi_graph_get_remote_endpoint(fwnode, NULL, &port, NULL);

		if (ret)

			return NULL;

	}



	return port;

}

EXPORT_SYMBOL_GPL(fwnode_graph_get_remote_port);



/**

 * fwnode_graph_get_remote_endpoint - Return fwnode of a remote endpoint

 * @fwnode: Endpoint firmware node pointing to the remote endpoint

 *

 * Extracts firmware node of a remote endpoint the @fwnode points to.

 */

struct fwnode_handle *

fwnode_graph_get_remote_endpoint(struct fwnode_handle *fwnode)

{

	struct fwnode_handle *endpoint = NULL;



	if (is_of_node(fwnode)) {

		struct device_node *node;



		node = of_parse_phandle(to_of_node(fwnode), "remote-endpoint",

					0);

		if (node)

			endpoint = &node->fwnode;

	} else if (is_acpi_node(fwnode)) {

		int ret;



		ret = acpi_graph_get_remote_endpoint(fwnode, NULL, NULL,

						     &endpoint);

		if (ret)

			return NULL;

	}



	return endpoint;

}

EXPORT_SYMBOL_GPL(fwnode_graph_get_remote_endpoint);

include/linux/property.h

+9 −0
Original line number Diff line number Diff line
@@ -268,4 +268,13 @@ int device_get_phy_mode(struct device *dev); 


void *device_get_mac_address(struct device *dev, char *addr, int alen);



struct fwnode_handle *fwnode_graph_get_next_endpoint(

	struct fwnode_handle *fwnode, struct fwnode_handle *prev);

struct fwnode_handle *fwnode_graph_get_remote_port_parent(

	struct fwnode_handle *fwnode);

struct fwnode_handle *fwnode_graph_get_remote_port(

	struct fwnode_handle *fwnode);

struct fwnode_handle *fwnode_graph_get_remote_endpoint(

	struct fwnode_handle *fwnode);



#endif /* _LINUX_PROPERTY_H_ */