linux-kernel - [PATCH v5 6/7] of: Implement simplified graph binding for single port devices

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Date:	Thu, 27 Feb 2014 18:35:39 +0100
From:	Philipp Zabel <p.zabel@...gutronix.de>
To:	Grant Likely <grant.likely@...aro.org>,
	Mauro Carvalho Chehab <m.chehab@...sung.com>,
	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Rob Herring <robh+dt@...nel.org>,
	Sylwester Nawrocki <s.nawrocki@...sung.com>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Guennadi Liakhovetski <g.liakhovetski@....de>,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
	devicetree@...r.kernel.org, Philipp Zabel <p.zabel@...gutronix.de>
Subject: [PATCH v5 6/7] of: Implement simplified graph binding for single port devices

For simple devices with only one port, it can be made implicit.
The endpoint node can be a direct child of the device node.

Signed-off-by: Philipp Zabel <p.zabel@...gutronix.de>
---
 drivers/of/base.c | 24 +++++++++++++++++++-----
 1 file changed, 19 insertions(+), 5 deletions(-)

diff --git a/drivers/of/base.c b/drivers/of/base.c
index ba3cfca..7d9c62b 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -2037,8 +2037,13 @@ struct device_node *of_graph_get_next_endpoint(const struct device_node *parent,
 		struct device_node *node;
 		/*
 		 * It's the first call, we have to find a port subnode
-		 * within this node or within an optional 'ports' node.
+		 * within this node or within an optional 'ports' node,
+		 * or at least a single endpoint.
 		 */
+		endpoint = of_get_child_by_name(parent, "endpoint");
+		if (endpoint)
+			return endpoint;
+
 		node = of_get_child_by_name(parent, "ports");
 		if (node)
 			parent = node;
@@ -2049,8 +2054,6 @@ struct device_node *of_graph_get_next_endpoint(const struct device_node *parent,
 			/* Found a port, get an endpoint. */
 			endpoint = of_get_next_child(port, NULL);
 			of_node_put(port);
-		} else {
-			endpoint = NULL;
 		}
 
 		if (!endpoint)
@@ -2065,6 +2068,10 @@ struct device_node *of_graph_get_next_endpoint(const struct device_node *parent,
 	if (WARN_ONCE(!port, "%s(): endpoint has no parent node\n",
 		      __func__))
 		return NULL;
+	if (port == parent) {
+		of_node_put(port);
+		return NULL;
+	}
 
 	/* Avoid dropping prev node refcount to 0. */
 	of_node_get(prev);
@@ -2105,9 +2112,11 @@ struct device_node *of_graph_get_remote_port_parent(
 	/* Get remote endpoint node. */
 	np = of_parse_phandle(node, "remote-endpoint", 0);
 
-	/* Walk 3 levels up only if there is 'ports' node. */
+	/* Walk 3 levels up only if there is 'ports' node */
 	for (depth = 3; depth && np; depth--) {
 		np = of_get_next_parent(np);
+		if (depth == 3 && of_node_cmp(np->name, "port"))
+			break;
 		if (depth == 2 && of_node_cmp(np->name, "ports"))
 			break;
 	}
@@ -2130,6 +2139,11 @@ struct device_node *of_graph_get_remote_port(const struct device_node *node)
 	np = of_parse_phandle(node, "remote-endpoint", 0);
 	if (!np)
 		return NULL;
-	return of_get_next_parent(np);
+	np = of_get_next_parent(np);
+	if (of_node_cmp(np->name, "port")) {
+		of_node_put(np);
+		return NULL;
+	}
+	return np;
 }
 EXPORT_SYMBOL(of_graph_get_remote_port);
-- 
1.8.5.3

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