From: Hans Verkuil <hans.verkuil@xxxxxxxxx>
Add DT support. Use it to get the reset and pwdn pins (if there are any).
Tested with one sensor requiring reset/pwdn and one sensor that doesn't
have reset/pwdn pins.
Signed-off-by: Hans Verkuil <hans.verkuil@xxxxxxxxx>
---
drivers/media/i2c/ov7670.c | 42 ++++++++++++++++++++++++++++++++++++++++--
1 file changed, 40 insertions(+), 2 deletions(-)
diff --git a/drivers/media/i2c/ov7670.c b/drivers/media/i2c/ov7670.c
index da08436..24f388e 100644
--- a/drivers/media/i2c/ov7670.c
+++ b/drivers/media/i2c/ov7670.c
@@ -17,6 +17,8 @@
#include <linux/i2c.h>
#include <linux/delay.h>
#include <linux/videodev2.h>
+#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
#include <media/v4l2-device.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-mediabus.h>
@@ -229,6 +231,8 @@ struct ov7670_info {
};
struct ov7670_format_struct *fmt; /* Current format */
struct clk *clk;
+ struct gpio_desc *resetb_gpio;
+ struct gpio_desc *pwdn_gpio;
int min_width; /* Filter out smaller sizes */
int min_height; /* Filter out smaller sizes */
int clock_speed; /* External clock speed (MHz) */
@@ -591,8 +595,6 @@ static int ov7670_init(struct v4l2_subdev *sd, u32 val)
return ov7670_write_array(sd, ov7670_default_regs);
}
-
-
static int ov7670_detect(struct v4l2_subdev *sd)
{
unsigned char v;
@@ -1549,6 +1551,29 @@ static const struct ov7670_devtype ov7670_devdata[] = {
},
};
+static int ov7670_init_gpio(struct i2c_client *client, struct ov7670_info *info)
+{
+ /* Request the power down GPIO asserted */
+ info->pwdn_gpio = devm_gpiod_get_optional(&client->dev, "pwdn",
+ GPIOD_OUT_LOW);
+ if (IS_ERR(info->pwdn_gpio)) {
+ dev_info(&client->dev, "can't get %s GPIO\n", "pwdn");
+ return PTR_ERR(info->pwdn_gpio);
+ }
+
+ /* Request the reset GPIO deasserted */
+ info->resetb_gpio = devm_gpiod_get_optional(&client->dev, "resetb",
+ GPIOD_OUT_LOW);
+ if (IS_ERR(info->resetb_gpio)) {
+ dev_info(&client->dev, "can't get %s GPIO\n", "resetb");
+ return PTR_ERR(info->resetb_gpio);
+ }
+
+ usleep_range(3000, 5000);
+
+ return 0;
+}
+
static int ov7670_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
@@ -1594,6 +1619,10 @@ static int ov7670_probe(struct i2c_client *client,
return -EPROBE_DEFER;
clk_prepare_enable(info->clk);
+ ret = ov7670_init_gpio(client, info);
+ if (ret)
+ return ret;
+
info->clock_speed = clk_get_rate(info->clk) / 1000000;
if (info->clock_speed < 10 || info->clock_speed > 48)
return -EINVAL;
@@ -1689,9 +1718,18 @@ static const struct i2c_device_id ov7670_id[] = {
};
MODULE_DEVICE_TABLE(i2c, ov7670_id);
+#if IS_ENABLED(CONFIG_OF)
+static const struct of_device_id ov7670_of_match[] = {
+ { .compatible = "ovti,ov7670", },
+ { /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, ov7670_of_match);
+#endif
+
static struct i2c_driver ov7670_driver = {
.driver = {
.name = "ov7670",
+ .of_match_table = of_match_ptr(ov7670_of_match),
},
.probe = ov7670_probe,
.remove = ov7670_remove,
--
2.10.2
--
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