linux-kernel - Re: [PATCH 07/13] media: i2c: ov5647: Add support for regulator control.

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Message-ID: <bf9f4a7f-3758-4877-8985-75bfe566745c@gmx.net>
Date: Sun, 2 Nov 2025 13:35:06 +0100
From: Stefan Wahren <wahrenst@....net>
To: Jai Luthra <jai.luthra@...asonboard.com>,
 Sakari Ailus <sakari.ailus@...ux.intel.com>,
 Dave Stevenson <dave.stevenson@...pberrypi.com>,
 Jacopo Mondi <jacopo@...ndi.org>, Mauro Carvalho Chehab <mchehab@...nel.org>
Cc: linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
 Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
 Kieran Bingham <kieran.bingham@...asonboard.com>,
 David Plowman <david.plowman@...pberrypi.com>,
 Laurent Pinchart <laurent.pinchart@...asonboard.com>,
 Peter Robinson <pbrobinson@...il.com>, "Ivan T. Ivanov" <iivanov@...e.de>
Subject: Re: [PATCH 07/13] media: i2c: ov5647: Add support for regulator
 control.

Am 28.10.25 um 08:27 schrieb Jai Luthra:
> From: Dave Stevenson <dave.stevenson@...pberrypi.com>
>
> The driver supported using GPIOs to control the shutdown line,
> but no regulator control.
>
> Add regulator hooks.
>
> Signed-off-by: Dave Stevenson <dave.stevenson@...pberrypi.com>
> Signed-off-by: Jai Luthra <jai.luthra@...asonboard.com>
> ---
>   drivers/media/i2c/ov5647.c | 37 +++++++++++++++++++++++++++++++++++++
>   1 file changed, 37 insertions(+)
>
> diff --git a/drivers/media/i2c/ov5647.c b/drivers/media/i2c/ov5647.c
> index a33e2d8edc114d302e830639cb7cb161f16a6208..598764638d518a28c8ac61ea590b996f09ecd45c 100644
> --- a/drivers/media/i2c/ov5647.c
> +++ b/drivers/media/i2c/ov5647.c
> @@ -20,6 +20,7 @@
>   #include <linux/module.h>
>   #include <linux/of_graph.h>
>   #include <linux/pm_runtime.h>
> +#include <linux/regulator/consumer.h>
>   #include <linux/slab.h>
>   #include <linux/videodev2.h>
>   #include <media/v4l2-ctrls.h>
> @@ -83,6 +84,15 @@
>   #define OV5647_EXPOSURE_DEFAULT		1000
>   #define OV5647_EXPOSURE_MAX		65535
>   
> +/* regulator supplies */
> +static const char * const ov5647_supply_names[] = {
> +	"avdd",		/* Analog power */
> +	"dovdd",	/* Digital I/O power */
> +	"dvdd",		/* Digital core power */
> +};
> +
> +#define OV5647_NUM_SUPPLIES ARRAY_SIZE(ov5647_supply_names)
> +
>   struct regval_list {
>   	u16 addr;
>   	u8 data;
> @@ -104,6 +114,7 @@ struct ov5647 {
>   	struct mutex			lock;
>   	struct clk			*xclk;
>   	struct gpio_desc		*pwdn;
> +	struct regulator_bulk_data supplies[OV5647_NUM_SUPPLIES];
>   	bool				clock_ncont;
>   	struct v4l2_ctrl_handler	ctrls;
>   	const struct ov5647_mode	*mode;
> @@ -781,6 +792,12 @@ static int ov5647_power_on(struct device *dev)
>   
>   	dev_dbg(dev, "OV5647 power on\n");
>   
> +	ret = regulator_bulk_enable(OV5647_NUM_SUPPLIES, sensor->supplies);
> +	if (ret < 0) {
> +		dev_err(dev, "Failed to enable regulators\n");
In case we want to log this, please add the return code as well
> +		return ret;
> +	}
> +
>   	if (sensor->pwdn) {
>   		gpiod_set_value_cansleep(sensor->pwdn, 0);
>   		msleep(PWDN_ACTIVE_DELAY_MS);
> @@ -812,6 +829,7 @@ static int ov5647_power_on(struct device *dev)
>   	clk_disable_unprepare(sensor->xclk);
>   error_pwdn:
>   	gpiod_set_value_cansleep(sensor->pwdn, 1);
> +	regulator_bulk_disable(OV5647_NUM_SUPPLIES, sensor->supplies);
>   
>   	return ret;
>   }
> @@ -841,6 +859,7 @@ static int ov5647_power_off(struct device *dev)
>   
>   	clk_disable_unprepare(sensor->xclk);
>   	gpiod_set_value_cansleep(sensor->pwdn, 1);
> +	regulator_bulk_disable(OV5647_NUM_SUPPLIES, sensor->supplies);
>   
>   	return 0;
>   }
> @@ -1341,6 +1360,18 @@ static const struct v4l2_ctrl_ops ov5647_ctrl_ops = {
>   	.s_ctrl = ov5647_s_ctrl,
>   };
>   
> +static int ov5647_configure_regulators(struct device *dev,
> +				       struct ov5647 *sensor)
> +{
> +	unsigned int i;
> +
> +	for (i = 0; i < OV5647_NUM_SUPPLIES; i++)
> +		sensor->supplies[i].supply = ov5647_supply_names[i];
> +
> +	return devm_regulator_bulk_get(dev, OV5647_NUM_SUPPLIES,
> +				       sensor->supplies);
> +}
> +
>   static int ov5647_init_controls(struct ov5647 *sensor, struct device *dev)
>   {
>   	struct i2c_client *client = v4l2_get_subdevdata(&sensor->sd);
> @@ -1489,6 +1520,12 @@ static int ov5647_probe(struct i2c_client *client)
>   		return -EINVAL;
>   	}
>   
> +	ret = ov5647_configure_regulators(dev, sensor);
> +	if (ret) {
> +		dev_err(dev, "Failed to get power regulators\n");
Please use dev_err_probe here
> +		return ret;
> +	}
> +
>   	mutex_init(&sensor->lock);
>   
>   	sensor->mode = OV5647_DEFAULT_MODE;
>