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@xxxxxxxxxxxxxxx
Signed-off-by: Josh Wu <josh.wu@xxxxxxxxx>
Acked-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
---
Changes in v5:
- change the 'mclk' to 'xvclk'. As v4l2-clk will handle the CCF xvclk
and v4l2 master clock internally.
Changes in v4:
- modify the code comment.
- Add Laurent's acked by.
Changes in v3:
- fix gpiod usage.
- refine the ov2640_probe() function.
Changes in v2:
- use gpiod APIs.
- change the gpio pin's name according to datasheet.
- reduce the delay for .reset() function.
drivers/media/i2c/soc_camera/ov2640.c | 90 ++++++++++++++++++++++++++++++++---
1 file changed, 83 insertions(+), 7 deletions(-)
diff --git a/drivers/media/i2c/soc_camera/ov2640.c b/drivers/media/i2c/soc_camera/ov2640.c
index 057dd49..c70e9e7 100644
--- a/drivers/media/i2c/soc_camera/ov2640.c
+++ b/drivers/media/i2c/soc_camera/ov2640.c
@@ -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,
@@ -1121,9 +1190,16 @@ 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,
--
1.9.1
--
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