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author | Rob Herring <robh@kernel.org> | 2015-03-25 08:41:08 +0300 |
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committer | Rob Herring <robh@kernel.org> | 2015-03-25 08:41:08 +0300 |
commit | 8147e2e8f13d823307e1edf2add5a8df84180cca (patch) | |
tree | 476eae8727d98c56027ca1036a8f61ff261c9c51 /include | |
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 'include')
-rw-r--r-- | include/linux/of_graph.h | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/include/linux/of_graph.h b/include/linux/of_graph.h index befef42e015b..3c1c95a39e0c 100644 --- a/include/linux/of_graph.h +++ b/include/linux/of_graph.h @@ -26,9 +26,21 @@ struct of_endpoint { const struct device_node *local_node; }; +/** + * for_each_endpoint_of_node - iterate over every endpoint in a device node + * @parent: parent device node containing ports and endpoints + * @child: loop variable pointing to the current endpoint node + * + * When breaking out of the loop, of_node_put(child) has to be called manually. + */ +#define for_each_endpoint_of_node(parent, child) \ + for (child = of_graph_get_next_endpoint(parent, NULL); child != NULL; \ + child = of_graph_get_next_endpoint(parent, child)) + #ifdef CONFIG_OF int of_graph_parse_endpoint(const struct device_node *node, struct of_endpoint *endpoint); +struct device_node *of_graph_get_port_by_id(struct device_node *node, u32 id); struct device_node *of_graph_get_next_endpoint(const struct device_node *parent, struct device_node *previous); struct device_node *of_graph_get_remote_port_parent( @@ -42,6 +54,12 @@ static inline int of_graph_parse_endpoint(const struct device_node *node, return -ENOSYS; } +static inline struct device_node *of_graph_get_port_by_id( + struct device_node *node, u32 id) +{ + return NULL; +} + static inline struct device_node *of_graph_get_next_endpoint( const struct device_node *parent, struct device_node *previous) |