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Subject[PATCH v3 09/17] of_graph: add for_each_of_port() / for_each_of_endpoint_in_port()
Date
From: Kuninori Morimoto <kuninori.morimoto.gx@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.gx@renesas.com>
---
v2 -> v3

- 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 ee823c6..3de036f 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(
@@ -70,6 +85,20 @@ static inline struct device_node *of_graph_get_port_by_id(
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
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