Hi Hans,
On Mon, Mar 06, 2017 at 03:56:05PM +0100, Hans Verkuil wrote:
> From: Hans Verkuil <[email protected]>
>
> Get the clock for this sensor.
>
> Signed-off-by: Hans Verkuil <[email protected]>
> ---
> drivers/media/i2c/ov7670.c | 12 ++++++++++++
> 1 file changed, 12 insertions(+)
>
> diff --git a/drivers/media/i2c/ov7670.c b/drivers/media/i2c/ov7670.c
> index 50e4466a2b37..da0843617a49 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) */
> @@ -1587,6 +1589,15 @@ 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)
> + return -EINVAL;
clk_disable_unprepare() before return?
> +
> /* Make sure it's an ov7670 */
> ret = ov7670_detect(sd);
> if (ret) {
> @@ -1667,6 +1678,7 @@ 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;
> }
>
--
Kind regards,
Sakari Ailus
e-mail: [email protected] XMPP: [email protected]
