[media] s5p-fimc: Add device tree based sensors registration

The sensor (I2C and/or SPI client) devices are instantiated by their
corresponding control bus drivers. Since the I2C client's master clock
is often provided by a video bus receiver (host interface) or other
than I2C/SPI controller device, the drivers of those client devices
are not accessing hardware in their driver's probe() callback. Instead,
after enabling clock, the host driver calls back into a sub-device
when it wants to activate them. This pattern is used by some in-tree
drivers and this patch also uses it for DT case. This patch is intended
as a first step for adding device tree support to the S5P/Exynos SoC
camera drivers. The second one is adding support for asynchronous
sub-devices registration and clock control from sub-device driver
level. The bindings shall not change when asynchronous probing support
is added.

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:
Sylwester Nawrocki 2013-03-29 14:12:39 -03:00 committed by Mauro Carvalho Chehab
parent e2985a260e
commit 2b13f7d4e3
3 changed files with 302 additions and 25 deletions

View File

@ -72,18 +72,95 @@ Optional properties:
writeback input.
'parallel-ports' node
---------------------
This node should contain child 'port' nodes specifying active parallel video
input ports. It includes camera A and camera B inputs. 'reg' property in the
port nodes specifies data input - 0, 1 indicates input A, B respectively.
Optional properties
- samsung,camclk-out : specifies clock output for remote sensor,
0 - CAM_A_CLKOUT, 1 - CAM_B_CLKOUT;
Image sensor nodes
------------------
The sensor device nodes should be added to their control bus controller (e.g.
I2C0) nodes and linked to a port node in the csis or the parallel-ports node,
using the common video interfaces bindings, defined in video-interfaces.txt.
The implementation of this bindings requires clock-frequency property to be
present in the sensor device nodes.
Example:
aliases {
fimc0 = &fimc_0;
};
/* Parallel bus IF sensor */
i2c_0: i2c@13860000 {
s5k6aa: sensor@3c {
compatible = "samsung,s5k6aafx";
reg = <0x3c>;
vddio-supply = <...>;
clock-frequency = <24000000>;
clocks = <...>;
clock-names = "mclk";
port {
s5k6aa_ep: endpoint {
remote-endpoint = <&fimc0_ep>;
bus-width = <8>;
hsync-active = <0>;
vsync-active = <1>;
pclk-sample = <1>;
};
};
};
};
/* MIPI CSI-2 bus IF sensor */
s5c73m3: sensor@0x1a {
compatible = "samsung,s5c73m3";
reg = <0x1a>;
vddio-supply = <...>;
clock-frequency = <24000000>;
clocks = <...>;
clock-names = "mclk";
port {
s5c73m3_1: endpoint {
data-lanes = <1 2 3 4>;
remote-endpoint = <&csis0_ep>;
};
};
};
camera {
compatible = "samsung,fimc", "simple-bus";
#address-cells = <1>;
#size-cells = <1>;
status = "okay";
/* parallel camera ports */
parallel-ports {
/* camera A input */
port@0 {
reg = <0>;
fimc0_ep: endpoint {
remote-endpoint = <&s5k6aa_ep>;
bus-width = <8>;
hsync-active = <0>;
vsync-active = <1>;
pclk-sample = <1>;
};
};
};
fimc_0: fimc@11800000 {
compatible = "samsung,exynos4210-fimc";
reg = <0x11800000 0x1000>;
@ -95,6 +172,15 @@ Example:
compatible = "samsung,exynos4210-csis";
reg = <0x11880000 0x1000>;
interrupts = <0 78 0>;
/* camera C input */
port@3 {
reg = <3>;
csis0_ep: endpoint {
remote-endpoint = <&s5c73m3_ep>;
data-lanes = <1 2 3 4>;
samsung,csis-hs-settle = <12>;
};
};
};
};

View File

@ -251,7 +251,7 @@ static struct v4l2_subdev *fimc_md_register_sensor(struct fimc_md *fmd,
sd->grp_id = GRP_ID_SENSOR;
v4l2_info(&fmd->v4l2_dev, "Registered sensor subdevice %s\n",
s_info->pdata.board_info->type);
sd->name);
return sd;
}
@ -263,13 +263,191 @@ static void fimc_md_unregister_sensor(struct v4l2_subdev *sd)
if (!client)
return;
v4l2_device_unregister_subdev(sd);
adapter = client->adapter;
i2c_unregister_device(client);
if (adapter)
i2c_put_adapter(adapter);
if (!client->dev.of_node) {
adapter = client->adapter;
i2c_unregister_device(client);
if (adapter)
i2c_put_adapter(adapter);
}
}
#ifdef CONFIG_OF
/* Register I2C client subdev associated with @node. */
static int fimc_md_of_add_sensor(struct fimc_md *fmd,
struct device_node *node, int index)
{
struct fimc_sensor_info *si;
struct i2c_client *client;
struct v4l2_subdev *sd;
int ret;
if (WARN_ON(index >= ARRAY_SIZE(fmd->sensor)))
return -EINVAL;
si = &fmd->sensor[index];
client = of_find_i2c_device_by_node(node);
if (!client)
return -EPROBE_DEFER;
device_lock(&client->dev);
if (!client->driver ||
!try_module_get(client->driver->driver.owner)) {
ret = -EPROBE_DEFER;
v4l2_info(&fmd->v4l2_dev, "No driver found for %s\n",
node->full_name);
goto dev_put;
}
/* Enable sensor's master clock */
ret = __fimc_md_set_camclk(fmd, si, true);
if (ret < 0)
goto mod_put;
sd = i2c_get_clientdata(client);
ret = v4l2_device_register_subdev(&fmd->v4l2_dev, sd);
__fimc_md_set_camclk(fmd, si, false);
if (ret < 0)
goto mod_put;
v4l2_set_subdev_hostdata(sd, si);
sd->grp_id = GRP_ID_SENSOR;
si->subdev = sd;
v4l2_info(&fmd->v4l2_dev, "Registered sensor subdevice: %s (%d)\n",
sd->name, fmd->num_sensors);
fmd->num_sensors++;
mod_put:
module_put(client->driver->driver.owner);
dev_put:
device_unlock(&client->dev);
put_device(&client->dev);
return ret;
}
/* Parse port node and register as a sub-device any sensor specified there. */
static int fimc_md_parse_port_node(struct fimc_md *fmd,
struct device_node *port,
unsigned int index)
{
struct device_node *rem, *ep, *np;
struct fimc_source_info *pd;
struct v4l2_of_endpoint endpoint;
int ret;
u32 val;
pd = &fmd->sensor[index].pdata;
/* Assume here a port node can have only one endpoint node. */
ep = of_get_next_child(port, NULL);
if (!ep)
return 0;
v4l2_of_parse_endpoint(ep, &endpoint);
if (WARN_ON(endpoint.port == 0) || index >= FIMC_MAX_SENSORS)
return -EINVAL;
pd->mux_id = (endpoint.port - 1) & 0x1;
rem = v4l2_of_get_remote_port_parent(ep);
of_node_put(ep);
if (rem == NULL) {
v4l2_info(&fmd->v4l2_dev, "Remote device at %s not found\n",
ep->full_name);
return 0;
}
if (!of_property_read_u32(rem, "samsung,camclk-out", &val))
pd->clk_id = val;
if (!of_property_read_u32(rem, "clock-frequency", &val))
pd->clk_frequency = val;
if (pd->clk_frequency == 0) {
v4l2_err(&fmd->v4l2_dev, "Wrong clock frequency at node %s\n",
rem->full_name);
of_node_put(rem);
return -EINVAL;
}
if (fimc_input_is_parallel(endpoint.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)) {
/*
* MIPI CSI-2: only input mux selection and
* the sensor's clock frequency is needed.
*/
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);
}
/*
* For FIMC-IS handled sensors, that are placed under i2c-isp device
* node, FIMC is connected to the FIMC-IS through its ISP Writeback
* input. Sensors are attached to the FIMC-LITE hostdata interface
* directly or through MIPI-CSIS, depending on the external media bus
* used. This needs to be handled in a more reliable way, not by just
* checking parent's node name.
*/
np = of_get_parent(rem);
if (np && !of_node_cmp(np->name, "i2c-isp"))
pd->fimc_bus_type = FIMC_BUS_TYPE_ISP_WRITEBACK;
else
pd->fimc_bus_type = pd->sensor_bus_type;
ret = fimc_md_of_add_sensor(fmd, rem, index);
of_node_put(rem);
return ret;
}
/* Register all SoC external sub-devices */
static int fimc_md_of_sensors_register(struct fimc_md *fmd,
struct device_node *np)
{
struct device_node *parent = fmd->pdev->dev.of_node;
struct device_node *node, *ports;
int index = 0;
int ret;
/* Attach sensors linked to MIPI CSI-2 receivers */
for_each_available_child_of_node(parent, node) {
struct device_node *port;
if (of_node_cmp(node->name, "csis"))
continue;
/* The csis node can have only port subnode. */
port = of_get_next_child(node, NULL);
if (!port)
continue;
ret = fimc_md_parse_port_node(fmd, port, index);
if (ret < 0)
return ret;
index++;
}
/* Attach sensors listed in the parallel-ports node */
ports = of_get_child_by_name(parent, "parallel-ports");
if (!ports)
return 0;
for_each_child_of_node(ports, node) {
ret = fimc_md_parse_port_node(fmd, node, index);
if (ret < 0)
break;
index++;
}
return 0;
}
static int __of_get_csis_id(struct device_node *np)
{
u32 reg = 0;
@ -281,14 +459,17 @@ static int __of_get_csis_id(struct device_node *np)
return reg - FIMC_INPUT_MIPI_CSI2_0;
}
#else
#define fimc_md_of_sensors_register(fmd, np) (-ENOSYS)
#define __of_get_csis_id(np) (-ENOSYS)
#endif
static int fimc_md_register_sensor_entities(struct fimc_md *fmd)
{
struct s5p_platform_fimc *pdata = fmd->pdev->dev.platform_data;
struct device_node *of_node = fmd->pdev->dev.of_node;
struct fimc_dev *fd = NULL;
int num_clients, ret, i;
int num_clients = 0;
int ret, i;
/*
* Runtime resume one of the FIMC entities to make sure
@ -299,34 +480,41 @@ static int fimc_md_register_sensor_entities(struct fimc_md *fmd)
fd = fmd->fimc[i];
if (!fd)
return -ENXIO;
ret = pm_runtime_get_sync(&fd->pdev->dev);
if (ret < 0)
return ret;
WARN_ON(pdata->num_clients > ARRAY_SIZE(fmd->sensor));
num_clients = min_t(u32, pdata->num_clients, ARRAY_SIZE(fmd->sensor));
if (of_node) {
fmd->num_sensors = 0;
ret = fimc_md_of_sensors_register(fmd, of_node);
} else if (pdata) {
WARN_ON(pdata->num_clients > ARRAY_SIZE(fmd->sensor));
num_clients = min_t(u32, pdata->num_clients,
ARRAY_SIZE(fmd->sensor));
fmd->num_sensors = num_clients;
fmd->num_sensors = num_clients;
for (i = 0; i < num_clients; i++) {
struct v4l2_subdev *sd;
for (i = 0; i < num_clients; i++) {
struct v4l2_subdev *sd;
fmd->sensor[i].pdata = pdata->source_info[i];
ret = __fimc_md_set_camclk(fmd, &fmd->sensor[i], true);
if (ret)
break;
sd = fimc_md_register_sensor(fmd, &fmd->sensor[i]);
ret = __fimc_md_set_camclk(fmd, &fmd->sensor[i], false);
fmd->sensor[i].pdata = pdata->source_info[i];
ret = __fimc_md_set_camclk(fmd, &fmd->sensor[i], true);
if (ret)
break;
sd = fimc_md_register_sensor(fmd, &fmd->sensor[i]);
ret = __fimc_md_set_camclk(fmd, &fmd->sensor[i], false);
if (!IS_ERR(sd)) {
if (IS_ERR(sd)) {
fmd->sensor[i].subdev = NULL;
ret = PTR_ERR(sd);
break;
}
fmd->sensor[i].subdev = sd;
} else {
fmd->sensor[i].subdev = NULL;
ret = PTR_ERR(sd);
break;
if (ret)
break;
}
if (ret)
break;
}
pm_runtime_put(&fd->pdev->dev);
return ret;
}
@ -1037,7 +1225,7 @@ static int fimc_md_probe(struct platform_device *pdev)
if (ret)
goto err_unlock;
if (dev->platform_data) {
if (dev->platform_data || dev->of_node) {
ret = fimc_md_register_sensor_entities(fmd);
if (ret)
goto err_unlock;

View File

@ -45,6 +45,9 @@ enum fimc_bus_type {
FIMC_BUS_TYPE_ISP_WRITEBACK = FIMC_BUS_TYPE_LCD_WRITEBACK_B,
};
#define fimc_input_is_parallel(x) ((x) == 1 || (x) == 2)
#define fimc_input_is_mipi_csi(x) ((x) == 3 || (x) == 4)
struct i2c_board_info;
/**