[media] media: ov2640: add primary dt support

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>

diff --git a/drivers/media/i2c/soc_camera/ov2640.c b/drivers/media/i2c/soc_camera/ov2640.c
index 16adbcc..42d9ba3 100644 (file)
--- 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,
@@ -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,