[PATCH v6 5/8] [media] of: move common endpoint parsing to drivers/of

Philipp Zabel
2014-03-05T09:26:29Z

This patch adds a new struct of_endpoint which is then embedded in struct
v4l2_of_endpoint and contains the endpoint properties that are not V4L2
(or even media) specific: the port number, endpoint id, local device tree
node and remote endpoint phandle. 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.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
---
Changes since v5:
- Fixed documentation comment for of_graph_parse_endpoint
---
drivers/media/platform/exynos4-is/media-dev.c | 10 +++++-----
drivers/media/platform/exynos4-is/mipi-csis.c | 2 +-
drivers/media/v4l2-core/v4l2-of.c | 16 +++------------
drivers/of/base.c | 28 +++++++++++++++++++++++++++
include/linux/of_graph.h | 20 +++++++++++++++++++
include/media/v4l2-of.h | 8 ++------
6 files changed, 59 insertions(+), 25 deletions(-)

diff --git a/drivers/media/platform/exynos4-is/media-dev.c b/drivers/media/platform/exynos4-is/media-dev.c
index d0f82da..04d6ecd 100644
--- a/drivers/media/platform/exynos4-is/media-dev.c
+++ b/drivers/media/platform/exynos4-is/media-dev.c
@@ -469,10 +469,10 @@ static int fimc_md_parse_port_node(struct fimc_md *fmd,
return 0;

v4l2_of_parse_endpoint(ep, &endpoint);
- if (WARN_ON(endpoint.port == 0) || index >= FIMC_MAX_SENSORS)
+ if (WARN_ON(endpoint.base.port == 0) || index >= FIMC_MAX_SENSORS)
return -EINVAL;

- pd->mux_id = (endpoint.port - 1) & 0x1;
+ pd->mux_id = (endpoint.base.port - 1) & 0x1;

rem = of_graph_get_remote_port_parent(ep);
of_node_put(ep);
@@ -494,13 +494,13 @@ static int fimc_md_parse_port_node(struct fimc_md *fmd,
return -EINVAL;
}

- if (fimc_input_is_parallel(endpoint.port)) {
+ if (fimc_input_is_parallel(endpoint.base.port)) {
if (endpoint.bus_type == V4L2_MBUS_PARALLEL)
pd->sensor_bus_type = FIMC_BUS_TYPE_ITU_601;
else
pd->sensor_bus_type = FIMC_BUS_TYPE_ITU_656;
pd->flags = endpoint.bus.parallel.flags;
- } else if (fimc_input_is_mipi_csi(endpoint.port)) {
+ } else if (fimc_input_is_mipi_csi(endpoint.base.port)) {
/*
* MIPI CSI-2: only input mux selection and
* the sensor's clock frequency is needed.
@@ -508,7 +508,7 @@ static int fimc_md_parse_port_node(struct fimc_md *fmd,
pd->sensor_bus_type = FIMC_BUS_TYPE_MIPI_CSI2;
} else {
v4l2_err(&fmd->v4l2_dev, "Wrong port id (%u) at node %s\n",
- endpoint.port, rem->full_name);
+ endpoint.base.port, rem->full_name);
}
/*
* For FIMC-IS handled sensors, that are placed under i2c-isp device
diff --git a/drivers/media/platform/exynos4-is/mipi-csis.c b/drivers/media/platform/exynos4-is/mipi-csis.c
index fd1ae65..3678ba5 100644
--- a/drivers/media/platform/exynos4-is/mipi-csis.c
+++ b/drivers/media/platform/exynos4-is/mipi-csis.c
@@ -772,7 +772,7 @@ static int s5pcsis_parse_dt(struct platform_device *pdev,
/* Get port node and validate MIPI-CSI channel id. */
v4l2_of_parse_endpoint(node, &endpoint);

- state->index = endpoint.port - FIMC_INPUT_MIPI_CSI2_0;
+ state->index = endpoint.base.port - FIMC_INPUT_MIPI_CSI2_0;
if (state->index < 0 || state->index >= CSIS_MAX_ENTITIES)
return -ENXIO;

diff --git a/drivers/media/v4l2-core/v4l2-of.c b/drivers/media/v4l2-core/v4l2-of.c
index f919db3..b4ed9a9 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);
+ of_graph_parse_endpoint(node, &endpoint->base);
+ 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/drivers/of/base.c b/drivers/of/base.c
index a8e47d3..715144af 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -1985,6 +1985,34 @@ struct device_node *of_find_next_cache_node(const struct device_node *np)
}

/**
+ * of_graph_parse_endpoint() - parse common endpoint node properties
+ * @node: pointer to endpoint device_node
+ * @endpoint: pointer to the OF endpoint data structure
+ *
+ * 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
* @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 3bbeb60..2b233db 100644
--- a/include/linux/of_graph.h
+++ b/include/linux/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 3a49735..70fa7b7 100644
--- a/include/media/v4l2-of.h
+++ b/include/media/v4l2-of.h
@@ -51,17 +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
+ * @base: 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 base;
enum v4l2_mbus_type bus_type;
union {
struct v4l2_of_bus_parallel parallel;
--
1.9.0.rc3