From mboxrd@z Thu Jan 1 00:00:00 1970 From: Philipp Zabel Subject: [RFC PATCH 2/3] of: Add OF graph helper to get a specific port by id Date: Wed, 19 Mar 2014 16:12:03 +0100 Message-ID: <1395241924-9675-3-git-send-email-p.zabel@pengutronix.de> References: <1395241924-9675-1-git-send-email-p.zabel@pengutronix.de> Return-path: In-Reply-To: <1395241924-9675-1-git-send-email-p.zabel@pengutronix.de> Sender: linux-kernel-owner@vger.kernel.org To: linux-kernel@vger.kernel.org, kernel@pengutronix.de Cc: Sylwester Nawrocki , Russell King - ARM Linux , Greg KH , Mauro Carvalho Chehab , Tomi Valkeinen , Guennadi Liakhovetski , Rob Herring , Laurent Pinchart , Kyungmin Park , devicetree@vger.kernel.org, Philipp Zabel List-Id: devicetree@vger.kernel.org This patch adds the of_graph_get_port_by_id function to get a port device tree node by port id. Signed-off-by: Philipp Zabel --- drivers/of/base.c | 28 ++++++++++++++++++++++++++++ include/linux/of_graph.h | 7 +++++++ 2 files changed, 35 insertions(+) diff --git a/drivers/of/base.c b/drivers/of/base.c index abfc462..7ecffbe 100644 --- a/drivers/of/base.c +++ b/drivers/of/base.c @@ -2100,6 +2100,34 @@ 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 *node, int id) +{ + struct of_graph_entity *entity; + struct of_graph_port *port; + + entity = __of_graph_lookup_entity(node); + if (WARN_ONCE(!entity || list_empty(&entity->ports), + "%s(): no ports specified for %s\n", __func__, + node->full_name)) + return NULL; + + list_for_each_entry(port, &entity->ports, list) { + if (port->id == id) + return of_node_get(port->of_node); + } + + return NULL; +} +EXPORT_SYMBOL(of_graph_get_port_by_id); + +/** * of_graph_get_next_endpoint() - get next endpoint node * * @parent: pointer to the parent device node diff --git a/include/linux/of_graph.h b/include/linux/of_graph.h index b6dd55b..2701054 100644 --- a/include/linux/of_graph.h +++ b/include/linux/of_graph.h @@ -33,6 +33,7 @@ struct of_endpoint { #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, int 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( @@ -49,6 +50,12 @@ 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, + int id) +{ + return NULL; +} + static inline struct device_node *of_graph_get_next_endpoint( const struct device_node *parent, struct device_node *previous) -- 1.9.0