diff options
| -rw-r--r-- | drivers/media/i2c/ov7670.c | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/drivers/media/i2c/ov7670.c b/drivers/media/i2c/ov7670.c index 50e4466a2b37..912ff09c6100 100644 --- a/drivers/media/i2c/ov7670.c +++ b/drivers/media/i2c/ov7670.c @@ -10,6 +10,7 @@ * This file may be distributed under the terms of the GNU General * Public License, version 2. */ +#include <linux/clk.h> #include <linux/init.h> #include <linux/module.h> #include <linux/slab.h> @@ -227,6 +228,7 @@ struct ov7670_info { struct v4l2_ctrl *hue; }; struct ov7670_format_struct *fmt; /* Current format */ + struct clk *clk; int min_width; /* Filter out smaller sizes */ int min_height; /* Filter out smaller sizes */ int clock_speed; /* External clock speed (MHz) */ @@ -1587,13 +1589,24 @@ static int ov7670_probe(struct i2c_client *client, info->pclk_hb_disable = true; } + info->clk = devm_clk_get(&client->dev, "xclk"); + if (IS_ERR(info->clk)) + return -EPROBE_DEFER; + clk_prepare_enable(info->clk); + + info->clock_speed = clk_get_rate(info->clk) / 1000000; + if (info->clock_speed < 10 || info->clock_speed > 48) { + ret = -EINVAL; + goto clk_disable; + } + /* Make sure it's an ov7670 */ ret = ov7670_detect(sd); if (ret) { v4l_dbg(1, debug, client, "chip found @ 0x%x (%s) is not an ov7670 chip.\n", client->addr << 1, client->adapter->name); - return ret; + goto clk_disable; } v4l_info(client, "chip found @ 0x%02x (%s)\n", client->addr << 1, client->adapter->name); @@ -1656,6 +1669,8 @@ static int ov7670_probe(struct i2c_client *client, hdl_free: v4l2_ctrl_handler_free(&info->hdl); +clk_disable: + clk_disable_unprepare(info->clk); return ret; } @@ -1667,6 +1682,7 @@ static int ov7670_remove(struct i2c_client *client) v4l2_device_unregister_subdev(sd); v4l2_ctrl_handler_free(&info->hdl); + clk_disable_unprepare(info->clk); return 0; } |