diff options
author | Rob Herring <robh@kernel.org> | 2015-03-25 05:41:08 (GMT) |
---|---|---|
committer | Rob Herring <robh@kernel.org> | 2015-03-25 05:41:08 (GMT) |
commit | 8147e2e8f13d823307e1edf2add5a8df84180cca (patch) | |
tree | 476eae8727d98c56027ca1036a8f61ff261c9c51 /drivers/of/base.c | |
parent | bc465aa9d045feb0e13b4a8f32cc33c1943f62d6 (diff) | |
parent | bfe446e37c4efd8ade454911e8f80414bcbfc10d (diff) | |
download | linux-8147e2e8f13d823307e1edf2add5a8df84180cca.tar.xz |
Merge tag 'of-graph-for-4.0' of git://git.pengutronix.de/git/pza/linux into for-next
Pull of-graph helpers from Philipp Zabel:
of: Add of-graph helpers to loop over endpoints and find ports by id
This series converts of_graph_get_next_endpoint to decrement the refcount of
the passed prev parameter. This allows to add a for_each_endpoint_of_node
helper macro to loop over all endpoints in a device tree node.
The of_graph_get_port_by_id function is added to retrieve a port by its known
port id (contained in the reg property) from the device tree.
Diffstat (limited to 'drivers/of/base.c')
-rw-r--r-- | drivers/of/base.c | 41 |
1 files changed, 33 insertions, 8 deletions
diff --git a/drivers/of/base.c b/drivers/of/base.c index 8f165b1..69566b6 100644 --- a/drivers/of/base.c +++ b/drivers/of/base.c @@ -2083,13 +2083,44 @@ 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 * @prev: previous endpoint node, or NULL to get first * * Return: An 'endpoint' node pointer with refcount incremented. Refcount - * of the passed @prev node is not decremented, the caller have to use - * of_node_put() on it when done. + * of the passed @prev node is decremented. */ struct device_node *of_graph_get_next_endpoint(const struct device_node *parent, struct device_node *prev) @@ -2125,12 +2156,6 @@ struct device_node *of_graph_get_next_endpoint(const struct device_node *parent, if (WARN_ONCE(!port, "%s(): endpoint %s has no parent node\n", __func__, prev->full_name)) return NULL; - - /* - * Avoid dropping prev node refcount to 0 when getting the next - * child below. - */ - of_node_get(prev); } while (1) { |