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Message-Id: <1392388433-11453-1-git-send-email-p.zabel@pengutronix.de>
Date: Fri, 14 Feb 2014 15:33:53 +0100
From: Philipp Zabel <p.zabel@...gutronix.de>
To: Russell King - ARM Linux <linux@....linux.org.uk>,
Mauro Carvalho Chehab <m.chehab@...sung.com>
Cc: Grant Likely <grant.likely@...aro.org>,
Rob Herring <robh+dt@...nel.org>,
Sylwester Nawrocki <s.nawrocki@...sung.com>,
Laurent Pinchart <laurent.pinchart@...asonboard.com>,
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,
Guennadi Liakhovetski <g.liakhovetski@....de>,
Philipp Zabel <p.zabel@...gutronix.de>
Subject: [PATCH] [media] of: move common endpoint parsing to drivers/media
This patch adds a new struct of_endpoint which is embedded in struct
v4l2_of_endpoint and contains the endpoint properties that are not V4L2
specific: port number, endpoint id, local device tree node.
of_graph_parse_endpoint parses those properties and is used by
v4l2_of_parse_endpoint, which just adds the V4L2 MBUS information
to the containing v4l2_of_endpoint structure. of_graph_parse_endpoint
is split out so that non-V4L2 drivers don't have to open code reading
the port and endpoint ids from the reg properties.
Signed-off-by: Philipp Zabel <p.zabel@...gutronix.de>
---
drivers/media/of_graph.c | 32 ++++++++++++++++++++++++++++++++
drivers/media/v4l2-core/v4l2-of.c | 16 +++-------------
include/media/of_graph.h | 20 ++++++++++++++++++++
include/media/v4l2-of.h | 9 +++------
4 files changed, 58 insertions(+), 19 deletions(-)
diff --git a/drivers/media/of_graph.c b/drivers/media/of_graph.c
index aa526d7..5d1448a 100644
--- a/drivers/media/of_graph.c
+++ b/drivers/media/of_graph.c
@@ -14,6 +14,38 @@
#include <linux/kernel.h>
#include <linux/of.h>
#include <linux/types.h>
+#include <media/of_graph.h>
+
+/**
+ * of_graph_parse_endpoint() - parse common endpoint node properties
+ * @node: pointer to endpoint device_node
+ * @endpoint: pointer to the OF endpoint data structure
+ *
+ * All properties are optional. If none are found, we don't set any flags.
+ * This means the port has a static configuration and no properties have
+ * to be specified explicitly.
+ * The caller should hold a reference to @node.
+ */
+int of_graph_parse_endpoint(const struct device_node *node,
+ struct of_endpoint *endpoint)
+{
+ struct device_node *port_node = of_get_parent(node);
+
+ memset(endpoint, 0, sizeof(*endpoint));
+
+ endpoint->local_node = node;
+ /*
+ * It doesn't matter whether the two calls below succeed.
+ * If they don't then the default value 0 is used.
+ */
+ of_property_read_u32(port_node, "reg", &endpoint->port);
+ of_property_read_u32(node, "reg", &endpoint->id);
+
+ of_node_put(port_node);
+
+ return 0;
+}
+EXPORT_SYMBOL(of_graph_parse_endpoint);
/**
* of_graph_get_next_endpoint() - get next endpoint node
diff --git a/drivers/media/v4l2-core/v4l2-of.c b/drivers/media/v4l2-core/v4l2-of.c
index f919db3..a338c88 100644
--- a/drivers/media/v4l2-core/v4l2-of.c
+++ b/drivers/media/v4l2-core/v4l2-of.c
@@ -127,17 +127,9 @@ static void v4l2_of_parse_parallel_bus(const struct device_node *node,
int v4l2_of_parse_endpoint(const struct device_node *node,
struct v4l2_of_endpoint *endpoint)
{
- struct device_node *port_node = of_get_parent(node);
-
- memset(endpoint, 0, offsetof(struct v4l2_of_endpoint, head));
-
- endpoint->local_node = node;
- /*
- * It doesn't matter whether the two calls below succeed.
- * If they don't then the default value 0 is used.
- */
- of_property_read_u32(port_node, "reg", &endpoint->port);
- of_property_read_u32(node, "reg", &endpoint->id);
+ ret = of_graph_parse_endpoint(node, &endpoint->ep);
+ endpoint->bus_type = 0;
+ memset(&endpoint->bus, 0, sizeof(endpoint->bus));
v4l2_of_parse_csi_bus(node, endpoint);
/*
@@ -147,8 +139,6 @@ int v4l2_of_parse_endpoint(const struct device_node *node,
if (endpoint->bus.mipi_csi2.flags == 0)
v4l2_of_parse_parallel_bus(node, endpoint);
- of_node_put(port_node);
-
return 0;
}
EXPORT_SYMBOL(v4l2_of_parse_endpoint);
diff --git a/include/media/of_graph.h b/include/media/of_graph.h
index 3bbeb60..2b233db 100644
--- a/include/media/of_graph.h
+++ b/include/media/of_graph.h
@@ -14,7 +14,21 @@
#ifndef __LINUX_OF_GRAPH_H
#define __LINUX_OF_GRAPH_H
+/**
+ * struct of_endpoint - the OF graph endpoint data structure
+ * @port: identifier (value of reg property) of a port this endpoint belongs to
+ * @id: identifier (value of reg property) of this endpoint
+ * @local_node: pointer to device_node of this endpoint
+ */
+struct of_endpoint {
+ unsigned int port;
+ unsigned int id;
+ const struct device_node *local_node;
+};
+
#ifdef CONFIG_OF
+int of_graph_parse_endpoint(const struct device_node *node,
+ struct of_endpoint *endpoint);
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(
@@ -22,6 +36,12 @@ struct device_node *of_graph_get_remote_port_parent(
struct device_node *of_graph_get_remote_port(const struct device_node *node);
#else
+static inline int of_graph_parse_endpoint(const struct device_node *node,
+ struct of_endpoint *endpoint);
+{
+ return -ENOSYS;
+}
+
static inline struct device_node *of_graph_get_next_endpoint(
const struct device_node *parent,
struct device_node *previous)
diff --git a/include/media/v4l2-of.h b/include/media/v4l2-of.h
index 8174282..d61def1 100644
--- a/include/media/v4l2-of.h
+++ b/include/media/v4l2-of.h
@@ -18,6 +18,7 @@
#include <linux/types.h>
#include <linux/errno.h>
+#include <media/of_graph.h>
#include <media/v4l2-mediabus.h>
struct device_node;
@@ -50,17 +51,13 @@ struct v4l2_of_bus_parallel {
/**
* struct v4l2_of_endpoint - the endpoint data structure
- * @port: identifier (value of reg property) of a port this endpoint belongs to
- * @id: identifier (value of reg property) of this endpoint
- * @local_node: pointer to device_node of this endpoint
+ * @ep: struct of_endpoint containing port, id, and local of_node
* @bus_type: bus type
* @bus: bus configuration data structure
* @head: list head for this structure
*/
struct v4l2_of_endpoint {
- unsigned int port;
- unsigned int id;
- const struct device_node *local_node;
+ struct of_endpoint ep;
enum v4l2_mbus_type bus_type;
union {
struct v4l2_of_bus_parallel parallel;
--
1.8.5.3
--
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