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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: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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2 changed files with 132 additions and 0 deletions
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@ -15,6 +15,7 @@
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#include <linux/kernel.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/of_graph.h>
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#include <linux/property.h>
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#include <linux/etherdevice.h>
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#include <linux/phy.h>
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@ -1176,3 +1177,125 @@ void *device_get_mac_address(struct device *dev, char *addr, int alen)
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return device_get_mac_addr(dev, "address", addr, alen);
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}
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EXPORT_SYMBOL(device_get_mac_address);
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/**
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* device_graph_get_next_endpoint - Get next endpoint firmware node
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* @fwnode: Pointer to the parent firmware node
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* @prev: Previous endpoint node or %NULL to get the first
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*
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* Returns an endpoint firmware node pointer or %NULL if no more endpoints
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* are available.
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*/
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struct fwnode_handle *
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fwnode_graph_get_next_endpoint(struct fwnode_handle *fwnode,
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struct fwnode_handle *prev)
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{
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struct fwnode_handle *endpoint = NULL;
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if (is_of_node(fwnode)) {
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struct device_node *node;
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node = of_graph_get_next_endpoint(to_of_node(fwnode),
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to_of_node(prev));
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if (node)
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endpoint = &node->fwnode;
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} else if (is_acpi_node(fwnode)) {
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endpoint = acpi_graph_get_next_endpoint(fwnode, prev);
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if (IS_ERR(endpoint))
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endpoint = NULL;
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}
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return endpoint;
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}
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EXPORT_SYMBOL_GPL(fwnode_graph_get_next_endpoint);
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/**
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* fwnode_graph_get_remote_port_parent - Return fwnode of a remote device
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* @fwnode: Endpoint firmware node pointing to the remote endpoint
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*
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* Extracts firmware node of a remote device the @fwnode points to.
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*/
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struct fwnode_handle *
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fwnode_graph_get_remote_port_parent(struct fwnode_handle *fwnode)
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{
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struct fwnode_handle *parent = NULL;
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if (is_of_node(fwnode)) {
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struct device_node *node;
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node = of_graph_get_remote_port_parent(to_of_node(fwnode));
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if (node)
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parent = &node->fwnode;
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} else if (is_acpi_node(fwnode)) {
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int ret;
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ret = acpi_graph_get_remote_endpoint(fwnode, &parent, NULL,
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NULL);
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if (ret)
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return NULL;
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}
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return parent;
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}
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EXPORT_SYMBOL_GPL(fwnode_graph_get_remote_port_parent);
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/**
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* fwnode_graph_get_remote_port - Return fwnode of a remote port
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* @fwnode: Endpoint firmware node pointing to the remote endpoint
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*
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* Extracts firmware node of a remote port the @fwnode points to.
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*/
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struct fwnode_handle *fwnode_graph_get_remote_port(struct fwnode_handle *fwnode)
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{
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struct fwnode_handle *port = NULL;
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if (is_of_node(fwnode)) {
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struct device_node *node;
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node = of_graph_get_remote_port(to_of_node(fwnode));
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if (node)
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port = &node->fwnode;
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} else if (is_acpi_node(fwnode)) {
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int ret;
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ret = acpi_graph_get_remote_endpoint(fwnode, NULL, &port, NULL);
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if (ret)
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return NULL;
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}
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return port;
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}
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EXPORT_SYMBOL_GPL(fwnode_graph_get_remote_port);
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/**
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* fwnode_graph_get_remote_endpoint - Return fwnode of a remote endpoint
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* @fwnode: Endpoint firmware node pointing to the remote endpoint
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*
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* Extracts firmware node of a remote endpoint the @fwnode points to.
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*/
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struct fwnode_handle *
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fwnode_graph_get_remote_endpoint(struct fwnode_handle *fwnode)
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{
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struct fwnode_handle *endpoint = NULL;
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if (is_of_node(fwnode)) {
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struct device_node *node;
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node = of_parse_phandle(to_of_node(fwnode), "remote-endpoint",
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0);
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if (node)
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endpoint = &node->fwnode;
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} else if (is_acpi_node(fwnode)) {
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int ret;
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ret = acpi_graph_get_remote_endpoint(fwnode, NULL, NULL,
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&endpoint);
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if (ret)
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return NULL;
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}
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return endpoint;
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}
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EXPORT_SYMBOL_GPL(fwnode_graph_get_remote_endpoint);
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@ -268,4 +268,13 @@ int device_get_phy_mode(struct device *dev);
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void *device_get_mac_address(struct device *dev, char *addr, int alen);
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struct fwnode_handle *fwnode_graph_get_next_endpoint(
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struct fwnode_handle *fwnode, struct fwnode_handle *prev);
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struct fwnode_handle *fwnode_graph_get_remote_port_parent(
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struct fwnode_handle *fwnode);
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struct fwnode_handle *fwnode_graph_get_remote_port(
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struct fwnode_handle *fwnode);
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struct fwnode_handle *fwnode_graph_get_remote_endpoint(
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struct fwnode_handle *fwnode);
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#endif /* _LINUX_PROPERTY_H_ */
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