From: Kuninori Morimoto <kuninori.morimoto...@renesas.com>

OF graph is used mainly from V4L2, but ALSA needs to use it. It already
has for_each_endpoint_of_node() which is for-loop for each endpoint.
But, ALSA needs for-loop for each port[s], and for-loop for each
endpoint of inside port[s]. This patch adds for_each_of_port()
and for_each_of_endpoint_in_port() for this purpose.

And it also adds for_each_of_endpoint() which is similar to
for_each_endpoint_of_node(). The difference is it can catch port
handle during for-loop.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto...@renesas.com>
---
v3 -> v4

 - no change

 drivers/of/base.c        | 64 ++++++++++++++++++++++++++++++++++++++++++++++++
 include/linux/of_graph.h | 29 ++++++++++++++++++++++
 2 files changed, 93 insertions(+)

diff --git a/drivers/of/base.c b/drivers/of/base.c
index e49eb28..b11f533 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -2354,6 +2354,70 @@ struct device_node *of_graph_get_top_port(struct device 
*dev)
 EXPORT_SYMBOL(of_graph_get_top_port);
 
 /**
+ * of_graph_get_next_port() - get next port 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 decremented.
+ */
+struct device_node *of_graph_get_next_port(const struct device_node *parent,
+                                          struct device_node *prev)
+{
+       struct device_node *port;
+       struct device_node *node;
+
+       if (!parent)
+               return NULL;
+
+       node = of_get_child_by_name(parent, "ports");
+       if (node)
+               parent = node;
+
+       /*
+        * Start by locating the port node. If no previous endpoint is specified
+        * search for the first port node, otherwise get the previous endpoint
+        * parent port node.
+        */
+       if (!prev) {
+               port = of_get_child_by_name(parent, "port");
+               if (!port)
+                       pr_err("%s(): no port node found in %s\n",
+                              __func__, parent->full_name);
+       } else {
+               do {
+                       port = of_get_next_child(parent, prev);
+                       if (!port)
+                               break;
+               } while (of_node_cmp(port->name, "port"));
+       }
+
+       of_node_put(node);
+
+       return port;
+}
+EXPORT_SYMBOL(of_graph_get_next_port);
+
+/**
+ * of_graph_get_next_endpoint_in_port() - get next endpoint node in port
+ * @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 decremented.
+ */
+struct device_node *of_graph_get_next_endpoint_in_port(
+                       const struct device_node *port,
+                       struct device_node *prev)
+{
+       if (!port)
+               return NULL;
+
+       return of_get_next_child(port, prev);
+}
+EXPORT_SYMBOL(of_graph_get_next_endpoint_in_port);
+
+/**
  * 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
diff --git a/include/linux/of_graph.h b/include/linux/of_graph.h
index 23b1c6e..8207631 100644
--- a/include/linux/of_graph.h
+++ b/include/linux/of_graph.h
@@ -30,6 +30,16 @@ struct of_endpoint {
        const struct device_node *local_node;
 };
 
+#define for_each_of_port(parent, port) \
+       for (port = of_graph_get_next_port(parent, NULL); port != NULL; \
+            port = of_graph_get_next_port(parent, port))
+#define for_each_of_endpoint_in_port(port, ep) \
+       for (ep = of_graph_get_next_endpoint_in_port(port, NULL); ep != NULL; \
+            ep = of_graph_get_next_endpoint_in_port(port, ep))
+#define for_each_of_endpoint(parent, port, ep) \
+       for_each_of_port(parent, port) \
+               for_each_of_endpoint_in_port(port, ep)
+
 /**
  * for_each_endpoint_of_node - iterate over every endpoint in a device node
  * @parent: parent device node containing ports and endpoints
@@ -46,6 +56,11 @@ 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_top_port(struct device *dev);
+struct device_node *of_graph_get_next_port(const struct device_node *parent,
+                                       struct device_node *prev);
+struct device_node *of_graph_get_next_endpoint_in_port(
+       const struct device_node *port,
+       struct device_node *prev);
 struct device_node *of_graph_get_next_endpoint(const struct device_node 
*parent,
                                        struct device_node *previous);
 struct device_node *of_graph_get_endpoint_by_regs(
@@ -75,6 +90,20 @@ static inline struct device_node 
*of_graph_get_top_port(struct device *dev)
        return NULL;
 }
 
+static inline struct device_node *of_graph_get_next_port(
+                                       const struct device_node *parent,
+                                       struct device_node *prev)
+{
+       return NULL;
+}
+
+static inline struct device_node *of_graph_get_next_endpoint_in_port(
+                                       const struct device_node *port,
+                                       struct device_node *prev)
+{
+       return NULL;
+}
+
 static inline struct device_node *of_graph_get_next_endpoint(
                                        const struct device_node *parent,
                                        struct device_node *previous)
-- 
1.9.1

Reply via email to