mirror of https://gitee.com/openkylin/linux.git
[media] Add a V4L2 OF parser
Add a V4L2 OF parser, implementing bindings documented in Documentation/devicetree/bindings/media/video-interfaces.txt. [s.nawrocki@samsung.com: various corrections and improvements since the initial version] Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Guennadi Liakhovetski
Mauro Carvalho Chehab
parent
53c5b6c95f
commit
99fd133f90
|
|
@ -9,6 +9,9 @@ videodev-objs := v4l2-dev.o v4l2-ioctl.o v4l2-device.o v4l2-fh.o \
|
|||
ifeq ($(CONFIG_COMPAT),y)
|
||||
videodev-objs += v4l2-compat-ioctl32.o
|
||||
endif
|
||||
ifeq ($(CONFIG_OF),y)
|
||||
videodev-objs += v4l2-of.o
|
||||
endif
|
||||
|
||||
obj-$(CONFIG_VIDEO_DEV) += videodev.o
|
||||
obj-$(CONFIG_VIDEO_V4L2_INT_DEVICE) += v4l2-int-device.o
|
||||
|
|
|
|||
|
|
@ -0,0 +1,267 @@
|
|||
/*
|
||||
* V4L2 OF binding parsing library
|
||||
*
|
||||
* Copyright (C) 2012 - 2013 Samsung Electronics Co., Ltd.
|
||||
* Sylwester Nawrocki <s.nawrocki@samsung.com>
|
||||
*
|
||||
* Copyright (C) 2012 Renesas Electronics Corp.
|
||||
* Author: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of version 2 of the GNU General Public License as
|
||||
* published by the Free Software Foundation.
|
||||
*/
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/of.h>
|
||||
#include <linux/string.h>
|
||||
#include <linux/types.h>
|
||||
|
||||
#include <media/v4l2-of.h>
|
||||
|
||||
static void 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;
|
||||
u32 v;
|
||||
|
||||
prop = of_find_property(node, "data-lanes", NULL);
|
||||
if (prop) {
|
||||
const __be32 *lane = NULL;
|
||||
int i;
|
||||
|
||||
for (i = 0; i < ARRAY_SIZE(data_lanes); i++) {
|
||||
lane = of_prop_next_u32(prop, lane, &data_lanes[i]);
|
||||
if (!lane)
|
||||
break;
|
||||
}
|
||||
bus->num_data_lanes = i;
|
||||
while (i--)
|
||||
bus->data_lanes[i] = data_lanes[i];
|
||||
}
|
||||
|
||||
if (!of_property_read_u32(node, "clock-lanes", &v)) {
|
||||
bus->clock_lane = v;
|
||||
have_clk_lane = true;
|
||||
}
|
||||
|
||||
if (of_get_property(node, "clock-noncontinuous", &v))
|
||||
flags |= V4L2_MBUS_CSI2_NONCONTINUOUS_CLOCK;
|
||||
else if (have_clk_lane || bus->num_data_lanes > 0)
|
||||
flags |= V4L2_MBUS_CSI2_CONTINUOUS_CLOCK;
|
||||
|
||||
bus->flags = flags;
|
||||
endpoint->bus_type = V4L2_MBUS_CSI2;
|
||||
}
|
||||
|
||||
static void v4l2_of_parse_parallel_bus(const struct device_node *node,
|
||||
struct v4l2_of_endpoint *endpoint)
|
||||
{
|
||||
struct v4l2_of_bus_parallel *bus = &endpoint->bus.parallel;
|
||||
unsigned int flags = 0;
|
||||
u32 v;
|
||||
|
||||
if (!of_property_read_u32(node, "hsync-active", &v))
|
||||
flags |= v ? V4L2_MBUS_HSYNC_ACTIVE_HIGH :
|
||||
V4L2_MBUS_HSYNC_ACTIVE_LOW;
|
||||
|
||||
if (!of_property_read_u32(node, "vsync-active", &v))
|
||||
flags |= v ? V4L2_MBUS_VSYNC_ACTIVE_HIGH :
|
||||
V4L2_MBUS_VSYNC_ACTIVE_LOW;
|
||||
|
||||
if (!of_property_read_u32(node, "pclk-sample", &v))
|
||||
flags |= v ? V4L2_MBUS_PCLK_SAMPLE_RISING :
|
||||
V4L2_MBUS_PCLK_SAMPLE_FALLING;
|
||||
|
||||
if (!of_property_read_u32(node, "field-even-active", &v))
|
||||
flags |= v ? V4L2_MBUS_FIELD_EVEN_HIGH :
|
||||
V4L2_MBUS_FIELD_EVEN_LOW;
|
||||
if (flags)
|
||||
endpoint->bus_type = V4L2_MBUS_PARALLEL;
|
||||
else
|
||||
endpoint->bus_type = V4L2_MBUS_BT656;
|
||||
|
||||
if (!of_property_read_u32(node, "data-active", &v))
|
||||
flags |= v ? V4L2_MBUS_DATA_ACTIVE_HIGH :
|
||||
V4L2_MBUS_DATA_ACTIVE_LOW;
|
||||
|
||||
if (of_get_property(node, "slave-mode", &v))
|
||||
flags |= V4L2_MBUS_SLAVE;
|
||||
else
|
||||
flags |= V4L2_MBUS_MASTER;
|
||||
|
||||
if (!of_property_read_u32(node, "bus-width", &v))
|
||||
bus->bus_width = v;
|
||||
|
||||
if (!of_property_read_u32(node, "data-shift", &v))
|
||||
bus->data_shift = v;
|
||||
|
||||
bus->flags = flags;
|
||||
|
||||
}
|
||||
EXPORT_SYMBOL(v4l2_of_parse_parallel_bus);
|
||||
|
||||
/**
|
||||
* v4l2_of_parse_endpoint() - parse all endpoint node properties
|
||||
* @node: pointer to endpoint device_node
|
||||
* @endpoint: pointer to the V4L2 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.
|
||||
* If any properties that identify the bus as parallel are found and
|
||||
* slave-mode isn't set, we set V4L2_MBUS_MASTER. Similarly, if we recognise
|
||||
* the bus as serial CSI-2 and clock-noncontinuous isn't set, we set the
|
||||
* V4L2_MBUS_CSI2_CONTINUOUS_CLOCK flag.
|
||||
* The caller should hold a reference to @node.
|
||||
*/
|
||||
void 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);
|
||||
|
||||
v4l2_of_parse_csi_bus(node, endpoint);
|
||||
/*
|
||||
* Parse the parallel video bus properties only if none
|
||||
* of the MIPI CSI-2 specific properties were found.
|
||||
*/
|
||||
if (endpoint->bus.mipi_csi2.flags == 0)
|
||||
v4l2_of_parse_parallel_bus(node, endpoint);
|
||||
|
||||
of_node_put(port_node);
|
||||
}
|
||||
EXPORT_SYMBOL(v4l2_of_parse_endpoint);
|
||||
|
||||
/**
|
||||
* v4l2_of_get_next_endpoint() - get next endpoint 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 not decremented, the caller have to use
|
||||
* of_node_put() on it when done.
|
||||
*/
|
||||
struct device_node *v4l2_of_get_next_endpoint(const struct device_node *parent,
|
||||
struct device_node *prev)
|
||||
{
|
||||
struct device_node *endpoint;
|
||||
struct device_node *port = NULL;
|
||||
|
||||
if (!parent)
|
||||
return NULL;
|
||||
|
||||
if (!prev) {
|
||||
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.
|
||||
*/
|
||||
node = of_get_child_by_name(parent, "ports");
|
||||
if (node)
|
||||
parent = node;
|
||||
|
||||
for_each_child_of_node(parent, node) {
|
||||
if (!of_node_cmp(node->name, "port")) {
|
||||
port = node;
|
||||
break;
|
||||
}
|
||||
}
|
||||
if (port) {
|
||||
/* Found a port, get an endpoint. */
|
||||
endpoint = of_get_next_child(port, NULL);
|
||||
of_node_put(port);
|
||||
} else {
|
||||
endpoint = NULL;
|
||||
}
|
||||
|
||||
if (!endpoint)
|
||||
pr_err("%s(): no endpoint nodes specified for %s\n",
|
||||
__func__, parent->full_name);
|
||||
} else {
|
||||
port = of_get_parent(prev);
|
||||
if (!port)
|
||||
/* Hm, has someone given us the root node ?... */
|
||||
return NULL;
|
||||
|
||||
/* Avoid dropping prev node refcount to 0. */
|
||||
of_node_get(prev);
|
||||
endpoint = of_get_next_child(port, prev);
|
||||
if (endpoint) {
|
||||
of_node_put(port);
|
||||
return endpoint;
|
||||
}
|
||||
|
||||
/* No more endpoints under this port, try the next one. */
|
||||
do {
|
||||
port = of_get_next_child(parent, port);
|
||||
if (!port)
|
||||
return NULL;
|
||||
} while (of_node_cmp(port->name, "port"));
|
||||
|
||||
/* Pick up the first endpoint in this port. */
|
||||
endpoint = of_get_next_child(port, NULL);
|
||||
of_node_put(port);
|
||||
}
|
||||
|
||||
return endpoint;
|
||||
}
|
||||
EXPORT_SYMBOL(v4l2_of_get_next_endpoint);
|
||||
|
||||
/**
|
||||
* v4l2_of_get_remote_port_parent() - get remote port's parent node
|
||||
* @node: pointer to a local endpoint device_node
|
||||
*
|
||||
* Return: Remote device node associated with remote endpoint node linked
|
||||
* to @node. Use of_node_put() on it when done.
|
||||
*/
|
||||
struct device_node *v4l2_of_get_remote_port_parent(
|
||||
const struct device_node *node)
|
||||
{
|
||||
struct device_node *np;
|
||||
unsigned int depth;
|
||||
|
||||
/* Get remote endpoint node. */
|
||||
np = of_parse_phandle(node, "remote-endpoint", 0);
|
||||
|
||||
/* Walk 3 levels up only if there is 'ports' node. */
|
||||
for (depth = 3; depth && np; depth--) {
|
||||
np = of_get_next_parent(np);
|
||||
if (depth == 2 && of_node_cmp(np->name, "ports"))
|
||||
break;
|
||||
}
|
||||
return np;
|
||||
}
|
||||
EXPORT_SYMBOL(v4l2_of_get_remote_port_parent);
|
||||
|
||||
/**
|
||||
* v4l2_of_get_remote_port() - get remote port node
|
||||
* @node: pointer to a local endpoint device_node
|
||||
*
|
||||
* Return: Remote port node associated with remote endpoint node linked
|
||||
* to @node. Use of_node_put() on it when done.
|
||||
*/
|
||||
struct device_node *v4l2_of_get_remote_port(const struct device_node *node)
|
||||
{
|
||||
struct device_node *np;
|
||||
|
||||
/* Get remote endpoint node. */
|
||||
np = of_parse_phandle(node, "remote-endpoint", 0);
|
||||
if (!np)
|
||||
return NULL;
|
||||
return of_get_parent(np);
|
||||
}
|
||||
EXPORT_SYMBOL(v4l2_of_get_remote_port);
|
||||
|
|
@ -0,0 +1,111 @@
|
|||
/*
|
||||
* V4L2 OF binding parsing library
|
||||
*
|
||||
* Copyright (C) 2012 Renesas Electronics Corp.
|
||||
* Author: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
|
||||
*
|
||||
* Copyright (C) 2012 - 2013 Samsung Electronics Co., Ltd.
|
||||
* Sylwester Nawrocki <s.nawrocki@samsung.com>
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of version 2 of the GNU General Public License as
|
||||
* published by the Free Software Foundation.
|
||||
*/
|
||||
#ifndef _V4L2_OF_H
|
||||
#define _V4L2_OF_H
|
||||
|
||||
#include <linux/list.h>
|
||||
#include <linux/types.h>
|
||||
#include <linux/errno.h>
|
||||
|
||||
#include <media/v4l2-mediabus.h>
|
||||
|
||||
struct device_node;
|
||||
|
||||
/**
|
||||
* struct v4l2_of_bus_mipi_csi2 - MIPI CSI-2 bus data structure
|
||||
* @flags: media bus (V4L2_MBUS_*) flags
|
||||
* @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
|
||||
*/
|
||||
struct v4l2_of_bus_mipi_csi2 {
|
||||
unsigned int flags;
|
||||
unsigned char data_lanes[4];
|
||||
unsigned char clock_lane;
|
||||
unsigned short num_data_lanes;
|
||||
};
|
||||
|
||||
/**
|
||||
* struct v4l2_of_bus_parallel - parallel data bus data structure
|
||||
* @flags: media bus (V4L2_MBUS_*) flags
|
||||
* @bus_width: bus width in bits
|
||||
* @data_shift: data shift in bits
|
||||
*/
|
||||
struct v4l2_of_bus_parallel {
|
||||
unsigned int flags;
|
||||
unsigned char bus_width;
|
||||
unsigned char data_shift;
|
||||
};
|
||||
|
||||
/**
|
||||
* 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
|
||||
* @remote: phandle to remote endpoint 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;
|
||||
const __be32 *remote;
|
||||
enum v4l2_mbus_type bus_type;
|
||||
union {
|
||||
struct v4l2_of_bus_parallel parallel;
|
||||
struct v4l2_of_bus_mipi_csi2 mipi_csi2;
|
||||
} bus;
|
||||
struct list_head head;
|
||||
};
|
||||
|
||||
#ifdef CONFIG_OF
|
||||
void v4l2_of_parse_endpoint(const struct device_node *node,
|
||||
struct v4l2_of_endpoint *link);
|
||||
struct device_node *v4l2_of_get_next_endpoint(const struct device_node *parent,
|
||||
struct device_node *previous);
|
||||
struct device_node *v4l2_of_get_remote_port_parent(
|
||||
const struct device_node *node);
|
||||
struct device_node *v4l2_of_get_remote_port(const struct device_node *node);
|
||||
#else /* CONFIG_OF */
|
||||
|
||||
static inline int v4l2_of_parse_endpoint(const struct device_node *node,
|
||||
struct v4l2_of_endpoint *link)
|
||||
{
|
||||
return -ENOSYS;
|
||||
}
|
||||
|
||||
static inline struct device_node *v4l2_of_get_next_endpoint(
|
||||
const struct device_node *parent,
|
||||
struct device_node *previous)
|
||||
{
|
||||
return NULL;
|
||||
}
|
||||
|
||||
static inline struct device_node *v4l2_of_get_remote_port_parent(
|
||||
const struct device_node *node)
|
||||
{
|
||||
return NULL;
|
||||
}
|
||||
|
||||
static inline struct device_node *v4l2_of_get_remote_port(
|
||||
const struct device_node *node)
|
||||
{
|
||||
return NULL;
|
||||
}
|
||||
|
||||
#endif /* CONFIG_OF */
|
||||
|
||||
#endif /* _V4L2_OF_H */
|
||||
Loading…
Reference in New Issue