diff options
Diffstat (limited to 'drivers/of')
| -rw-r--r-- | drivers/of/base.c | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/drivers/of/base.c b/drivers/of/base.c index f0650265febf..6f85ff74c10d 100644 --- a/drivers/of/base.c +++ b/drivers/of/base.c @@ -2231,6 +2231,40 @@ struct device_node *of_graph_get_next_endpoint(const struct device_node *parent, EXPORT_SYMBOL(of_graph_get_next_endpoint); /** + * of_graph_get_endpoint_by_regs() - get endpoint node of specific identifiers + * @parent: pointer to the parent device node + * @port_reg: identifier (value of reg property) of the parent port node + * @reg: identifier (value of reg property) of the endpoint node + * + * Return: An 'endpoint' node pointer which is identified by reg and at the same + * is the child of a port node identified by port_reg. reg and port_reg are + * ignored when they are -1. + */ +struct device_node *of_graph_get_endpoint_by_regs( + const struct device_node *parent, int port_reg, int reg) +{ + struct of_endpoint endpoint; + struct device_node *node, *prev_node = NULL; + + while (1) { + node = of_graph_get_next_endpoint(parent, prev_node); + of_node_put(prev_node); + if (!node) + break; + + of_graph_parse_endpoint(node, &endpoint); + if (((port_reg == -1) || (endpoint.port == port_reg)) && + ((reg == -1) || (endpoint.id == reg))) + return node; + + prev_node = node; + } + + return NULL; +} +EXPORT_SYMBOL(of_graph_get_endpoint_by_regs); + +/** * of_graph_get_remote_port_parent() - get remote port's parent node * @node: pointer to a local endpoint device_node * |