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[media] v4l: of: Read lane-polarities endpoint property 

Add lane_polarities field to struct v4l2_of_bus_mipi_csi2 and write the
contents of the lane-polarities property to it. The field tells the polarity
of the physical lanes starting from the first one. Any unused lanes are
ignored, i.e. only the polarity of the used lanes is specified.

Also rework reading the "data-lanes" property a little.

Signed-off-by: Sakari Ailus <sakari.ailus@iki.fi>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Sakari Ailus 2015-03-25 19:57:37 -03:00 committed by Mauro Carvalho Chehab
parent 9e1ee1b730
commit b6eec1c493
2 changed files with 35 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

39
drivers/media/v4l2-core/v4l2-of.c
View File

@ -19,11 +19,10 @@
#include <media/v4l2-of.h>
static void v4l2_of_parse_csi_bus(const struct device_node *node,
static int v4l2_of_parse_csi_bus(const struct device_node *node,
struct v4l2_of_endpoint *endpoint)
{
struct v4l2_of_bus_mipi_csi2 *bus = &endpoint->bus.mipi_csi2;
u32 data_lanes[ARRAY_SIZE(bus->data_lanes)];
struct property *prop;
bool have_clk_lane = false;
unsigned int flags = 0;
@ -32,16 +31,34 @@ static void v4l2_of_parse_csi_bus(const struct device_node *node,
prop = of_find_property(node, "data-lanes", NULL);
if (prop) {
const __be32 *lane = NULL;
int i;
unsigned int i;
for (i = 0; i < ARRAY_SIZE(data_lanes); i++) {
lane = of_prop_next_u32(prop, lane, &data_lanes[i]);
for (i = 0; i < ARRAY_SIZE(bus->data_lanes); i++) {
lane = of_prop_next_u32(prop, lane, &v);
if (!lane)
break;
bus->data_lanes[i] = v;
}
bus->num_data_lanes = i;
while (i--)
bus->data_lanes[i] = data_lanes[i];
}
prop = of_find_property(node, "lane-polarities", NULL);
if (prop) {
const __be32 *polarity = NULL;
unsigned int i;
for (i = 0; i < ARRAY_SIZE(bus->lane_polarities); i++) {
polarity = of_prop_next_u32(prop, polarity, &v);
if (!polarity)
break;
bus->lane_polarities[i] = v;
}
if (i < 1 + bus->num_data_lanes /* clock + data */) {
pr_warn("%s: too few lane-polarities entries (need %u, got %u)\n",
node->full_name, 1 + bus->num_data_lanes, i);
return -EINVAL;
}
}
if (!of_property_read_u32(node, "clock-lanes", &v)) {
@ -56,6 +73,8 @@ static void v4l2_of_parse_csi_bus(const struct device_node *node,
bus->flags = flags;
endpoint->bus_type = V4L2_MBUS_CSI2;
return 0;
}
static void v4l2_of_parse_parallel_bus(const struct device_node *node,
@ -127,11 +146,15 @@ 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)
{
int rval;
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);
rval = v4l2_of_parse_csi_bus(node, endpoint);
if (rval)
return rval;
/*
* Parse the parallel video bus properties only if none
* of the MIPI CSI-2 specific properties were found.

3
include/media/v4l2-of.h
View File

@ -29,12 +29,15 @@ struct device_node;
* @data_lanes: an array of physical data lane indexes
* @clock_lane: physical lane index of the clock lane
* @num_data_lanes: number of data lanes
* @lane_polarities: polarity of the lanes. The order is the same of
* the physical lanes.
*/
struct v4l2_of_bus_mipi_csi2 {
unsigned int flags;
unsigned char data_lanes[4];
unsigned char clock_lane;
unsigned short num_data_lanes;
bool lane_polarities[5];
};
/**