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[media] media: ov2640: add primary dt support

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Add device tree support for ov2640.
In device tree, user needs to provide the master clock (xvclk).
User can add the reset/pwdn pins if they have.

Cc: devicetree@vger.kernel.org
Signed-off-by: Josh Wu <josh.wu@atmel.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Josh Wu 2015-02-10 06:31:35 -03:00 committed by Mauro Carvalho Chehab
parent 87838addf6
commit 4e65172f7b
1 changed files with 83 additions and 7 deletions
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90
drivers/media/i2c/soc_camera/ov2640.c
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@ -18,6 +18,8 @@
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/gpio.h>
#include <linux/of_gpio.h>
#include <linux/v4l2-mediabus.h>
#include <linux/videodev2.h>
@ -283,6 +285,10 @@ struct ov2640_priv {
u32 cfmt_code;
struct v4l2_clk *clk;
const struct ov2640_win_size *win;
struct soc_camera_subdev_desc ssdd_dt;
struct gpio_desc *resetb_gpio;
struct gpio_desc *pwdn_gpio;
};
/*
@ -1038,6 +1044,63 @@ static struct v4l2_subdev_ops ov2640_subdev_ops = {
.video = &ov2640_subdev_video_ops,
};
/* OF probe functions */
static int ov2640_hw_power(struct device *dev, int on)
{
struct i2c_client *client = to_i2c_client(dev);
struct ov2640_priv *priv = to_ov2640(client);
dev_dbg(&client->dev, "%s: %s the camera\n",
__func__, on ? "ENABLE" : "DISABLE");
if (priv->pwdn_gpio)
gpiod_direction_output(priv->pwdn_gpio, !on);
return 0;
}
static int ov2640_hw_reset(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct ov2640_priv *priv = to_ov2640(client);
if (priv->resetb_gpio) {
/* Active the resetb pin to perform a reset pulse */
gpiod_direction_output(priv->resetb_gpio, 1);
usleep_range(3000, 5000);
gpiod_direction_output(priv->resetb_gpio, 0);
}
return 0;
}
static int ov2640_probe_dt(struct i2c_client *client,
struct ov2640_priv *priv)
{
/* Request the reset GPIO deasserted */
priv->resetb_gpio = devm_gpiod_get_optional(&client->dev, "resetb",
GPIOD_OUT_LOW);
if (!priv->resetb_gpio)
dev_dbg(&client->dev, "resetb gpio is not assigned!\n");
else if (IS_ERR(priv->resetb_gpio))
return PTR_ERR(priv->resetb_gpio);
/* Request the power down GPIO asserted */
priv->pwdn_gpio = devm_gpiod_get_optional(&client->dev, "pwdn",
GPIOD_OUT_HIGH);
if (!priv->pwdn_gpio)
dev_dbg(&client->dev, "pwdn gpio is not assigned!\n");
else if (IS_ERR(priv->pwdn_gpio))
return PTR_ERR(priv->pwdn_gpio);
/* Initialize the soc_camera_subdev_desc */
priv->ssdd_dt.power = ov2640_hw_power;
priv->ssdd_dt.reset = ov2640_hw_reset;
client->dev.platform_data = &priv->ssdd_dt;
return 0;
}
/*
* i2c_driver functions
*/
@ -1049,12 +1112,6 @@ static int ov2640_probe(struct i2c_client *client,
struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
int ret;
if (!ssdd) {
dev_err(&adapter->dev,
"OV2640: Missing platform_data for driver\n");
return -EINVAL;
}
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
dev_err(&adapter->dev,
"OV2640: I2C-Adapter doesn't support SMBUS\n");
@ -1068,10 +1125,22 @@ static int ov2640_probe(struct i2c_client *client,
return -ENOMEM;
}
priv->clk = v4l2_clk_get(&client->dev, "mclk");
priv->clk = v4l2_clk_get(&client->dev, "xvclk");
if (IS_ERR(priv->clk))
return -EPROBE_DEFER;
if (!ssdd && !client->dev.of_node) {
dev_err(&client->dev, "Missing platform_data for driver\n");
ret = -EINVAL;
goto err_clk;
}
if (!ssdd) {
ret = ov2640_probe_dt(client, priv);
if (ret)
goto err_clk;
}
v4l2_i2c_subdev_init(&priv->subdev, client, &ov2640_subdev_ops);
v4l2_ctrl_handler_init(&priv->hdl, 2);
v4l2_ctrl_new_std(&priv->hdl, &ov2640_ctrl_ops,
@ -1120,9 +1189,16 @@ static const struct i2c_device_id ov2640_id[] = {
};
MODULE_DEVICE_TABLE(i2c, ov2640_id);
static const struct of_device_id ov2640_of_match[] = {
{.compatible = "ovti,ov2640", },
{},
};
MODULE_DEVICE_TABLE(of, ov2640_of_match);
static struct i2c_driver ov2640_i2c_driver = {
.driver = {
.name = "ov2640",
.of_match_table = of_match_ptr(ov2640_of_match),
},
.probe = ov2640_probe,
.remove = ov2640_remove,