diff options
| -rw-r--r-- | drivers/base/property.c | 123 | ||||
| -rw-r--r-- | include/linux/property.h | 9 |
2 files changed, 132 insertions, 0 deletions
diff --git a/drivers/base/property.c b/drivers/base/property.c index 538b248d5dcf..4e98a6fad33f 100644 --- a/drivers/base/property.c +++ b/drivers/base/property.c @@ -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); diff --git a/include/linux/property.h b/include/linux/property.h index 514b19559fbe..8d7809c2c42d 100644 --- a/include/linux/property.h +++ b/include/linux/property.h @@ -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_ */ |