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[media] ov7670: add devicetree support 

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@cisco.com>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Hans Verkuil 2016-12-12 12:08:18 -02:00 committed by Mauro Carvalho Chehab
parent 0a024d634c
commit a0c4164e0e
1 changed files with 38 additions and 2 deletions
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40
drivers/media/i2c/ov7670.c
View File

@ -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 +1551,27 @@ static const struct ov7670_devtype ov7670_devdata[] = {
},
};
static int ov7670_init_gpio(struct i2c_client *client, struct ov7670_info *info)
{
info->pwdn_gpio = devm_gpiod_get_optional(&client->dev, "powerdown",
GPIOD_OUT_LOW);
if (IS_ERR(info->pwdn_gpio)) {
dev_info(&client->dev, "can't get %s GPIO\n", "powerdown");
return PTR_ERR(info->pwdn_gpio);
}
info->resetb_gpio = devm_gpiod_get_optional(&client->dev, "reset",
GPIOD_OUT_LOW);
if (IS_ERR(info->resetb_gpio)) {
dev_info(&client->dev, "can't get %s GPIO\n", "reset");
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 +1617,10 @@ static int ov7670_probe(struct i2c_client *client,
return -EPROBE_DEFER;
clk_prepare_enable(info->clk);
ret = ov7670_init_gpio(client, info);
if (ret)
goto clk_disable;
info->clock_speed = clk_get_rate(info->clk) / 1000000;
if (info->clock_speed < 10 || info->clock_speed > 48) {
ret = -EINVAL;
@ -1693,9 +1720,18 @@ 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,