Message-ID: <20200910220138.GJ3940@pendragon.ideasonboard.com>
Date:   Fri, 11 Sep 2020 01:01:38 +0300
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Bogdan Togorean <bogdan.togorean@...log.com>
Cc:     linux-media@...r.kernel.org,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
        Jacopo Mondi <jacopo+renesas@...ndi.org>,
        Kieran Bingham <kieran.bingham+renesas@...asonboard.com>,
        YueHaibing <yuehaibing@...wei.com>,
        Bingbu Cao <bingbu.cao@...el.com>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        Shawn Tu <shawnx.tu@...el.com>,
        Dongchun Zhu <dongchun.zhu@...iatek.com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] media: i2c: Add driver for the Analog Devices
 ADDI9036 ToF front-end

Hi Bogdan,

Thank you for the patch.

On Thu, Sep 10, 2020 at 07:24:06PM +0300, Bogdan Togorean wrote:
> The ADDI9036 is a complete, 45 MHz, front-end solution for charge
> coupled device (CCD) time of flight (TOF) imaging applications.
> 
> It has 2-lane MIPI CSI-2 RAW12 data output and i2c control interface.
> 
> The programming of calibration and firmware is performed by userspace
> SDK through CID_USER class IOCTLs.

I'm afraid that's not acceptable. The firmware should be loaded using
the Linux kernel firmware API. As for calibration, is it static data ?
How is it generated ?

> Signed-off-by: Bogdan Togorean <bogdan.togorean@...log.com>
> ---
>  MAINTAINERS                        |  10 +
>  drivers/media/i2c/Kconfig          |  14 +
>  drivers/media/i2c/Makefile         |   1 +
>  drivers/media/i2c/addi9036.c       | 673 +++++++++++++++++++++++++++++
>  include/uapi/linux/v4l2-controls.h |   6 +
>  5 files changed, 704 insertions(+)
>  create mode 100644 drivers/media/i2c/addi9036.c
> 
> diff --git a/MAINTAINERS b/MAINTAINERS
> index b5cfab015bd6..fb03ad9ca920 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -477,6 +477,16 @@ W:	http://wiki.analog.com/AD7879
>  W:	http://ez.analog.com/community/linux-device-drivers
>  F:	drivers/input/touchscreen/ad7879.c
>  
> +ADDI9036 TOF FRONTEND DRIVER
> +M:	Bogdan Togorean <bogdan.togorean@...log.com>
> +L:	linux-media@...r.kernel.org
> +S:	Supported
> +W:	https://www.analog.com/en/products/addi9036.html
> +W:	http://ez.analog.com/community/linux-device-drivers
> +T:	git git://linuxtv.org/media_tree.git
> +F:	Documentation/devicetree/bindings/media/i2c/adi,addi9036.yaml
> +F:	drivers/media/i2c/addi9036.c
> +
>  ADDRESS SPACE LAYOUT RANDOMIZATION (ASLR)
>  M:	Jiri Kosina <jikos@...nel.org>
>  S:	Maintained
> diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
> index c7ba76fee599..087dd307505d 100644
> --- a/drivers/media/i2c/Kconfig
> +++ b/drivers/media/i2c/Kconfig
> @@ -725,6 +725,20 @@ config VIDEO_APTINA_PLL
>  config VIDEO_SMIAPP_PLL
>  	tristate
>  
> +config VIDEO_ADDI9036
> +	tristate "Analog Devices ADDI9036 ToF front-end support"
> +	depends on I2C && VIDEO_V4L2
> +	select MEDIA_CONTROLLER
> +	select VIDEO_V4L2_SUBDEV_API
> +	select V4L2_FWNODE
> +	select REGMAP_I2C
> +	help
> +	  This is a Video4Linux2 driver for Analog Devices ADDI9036
> +	  Time of Flight front-end.
> +
> +	  To compile this driver as a module, choose M here: the
> +	  module will be called addi9036.
> +
>  config VIDEO_HI556
>  	tristate "Hynix Hi-556 sensor support"
>  	depends on I2C && VIDEO_V4L2
> diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
> index f0a77473979d..631a7c7612ca 100644
> --- a/drivers/media/i2c/Makefile
> +++ b/drivers/media/i2c/Makefile
> @@ -26,6 +26,7 @@ obj-$(CONFIG_VIDEO_AK7375)  += ak7375.o
>  obj-$(CONFIG_VIDEO_DW9714)  += dw9714.o
>  obj-$(CONFIG_VIDEO_DW9768)  += dw9768.o
>  obj-$(CONFIG_VIDEO_DW9807_VCM)  += dw9807-vcm.o
> +obj-$(CONFIG_VIDEO_ADDI9036) += addi9036.o
>  obj-$(CONFIG_VIDEO_ADV7170) += adv7170.o
>  obj-$(CONFIG_VIDEO_ADV7175) += adv7175.o
>  obj-$(CONFIG_VIDEO_ADV7180) += adv7180.o
> diff --git a/drivers/media/i2c/addi9036.c b/drivers/media/i2c/addi9036.c
> new file mode 100644
> index 000000000000..76c3444058dc
> --- /dev/null
> +++ b/drivers/media/i2c/addi9036.c
> @@ -0,0 +1,673 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Driver for the Analog Devices ADDI9036 ToF front-end.
> + *
> + * Copyright (C) 2019-2020 Analog Devices, All Rights Reserved.
> + *
> + */
> +
> +#include <linux/device.h>
> +#include <linux/gpio/consumer.h>
> +#include <linux/i2c.h>
> +#include <linux/init.h>
> +#include <linux/module.h>
> +#include <linux/mutex.h>
> +#include <linux/of.h>
> +#include <linux/of_graph.h>
> +#include <linux/regmap.h>
> +#include <linux/slab.h>
> +#include <linux/types.h>
> +#include <linux/version.h>
> +#include <media/v4l2-ctrls.h>
> +#include <media/v4l2-fwnode.h>
> +#include <media/v4l2-subdev.h>
> +
> +struct addi9036_mode_info {
> +	u32 width;
> +	u32 height;
> +	u32 pixel_rate;
> +	u32 link_freq_idx;
> +};
> +
> +struct addi9036 {
> +	struct regmap *regmap;
> +	struct device *dev;
> +	struct v4l2_subdev sd;
> +	struct media_pad pad;
> +	struct v4l2_fwnode_endpoint ep;
> +	struct v4l2_mbus_framefmt fmt;
> +	struct v4l2_rect crop;
> +
> +	const struct addi9036_mode_info *current_mode;
> +
> +	struct v4l2_ctrl_handler ctrls;
> +	struct v4l2_ctrl *pixel_rate;
> +	struct v4l2_ctrl *link_freq;
> +
> +	/* lock to protect power state */
> +	struct mutex power_lock;
> +	int power_count;
> +
> +	struct gpio_desc *rst_gpio;
> +
> +	/* controls */
> +	struct v4l2_ctrl *set_chip_config;
> +	struct v4l2_ctrl *reg_read;
> +};
> +
> +static inline struct addi9036 *to_addi9036(struct v4l2_subdev *sd)
> +{
> +	return container_of(sd, struct addi9036, sd);
> +}
> +
> +#define V4L2_CID_AD_DEV_SET_CHIP_CONFIG_QUERY  (V4L2_CID_USER_ADDI9036_BASE + 0)
> +#define V4L2_CID_AD_DEV_REG_READ_QUERY  (V4L2_CID_USER_ADDI9036_BASE + 1)
> +
> +static const struct reg_sequence addi9036_powerup_setting[] = {
> +	{ 0xc4c0, 0x001c },
> +	{ 0xc4c3, 0x001c },
> +	{ 0xc4d7, 0x0000 },
> +	{ 0xc4d5, 0x0002 },
> +	{ 0xc4da, 0x0001 },
> +	{ 0xc4f0, 0x0000 },
> +	{ 0xc427, 0x0003 },
> +	{ 0xc427, 0x0001 },
> +	{ 0xc427, 0x0000 },
> +	{ 0xc426, 0x0030 },
> +	{ 0xc426, 0x0010 },
> +	{ 0xc426, 0x0000 },
> +	{ 0xc423, 0x0080 },
> +	{ 0xc431, 0x0080 },
> +	{ 0x4001, 0x0007 },
> +	{ 0x7c22, 0x0004 }
> +};
> +
> +static const struct reg_sequence addi9036_powerdown_setting[] = {
> +	{ 0xc022, 0x0001 },
> +	{ 0x4001, 0x0006 },
> +	{ 0x7c22, 0x0004 },
> +	{ 0xc431, 0x0082 },
> +	{ 0xc423, 0x0000 },
> +	{ 0xc426, 0x0020 },
> +	{ 0xc427, 0x0002 },
> +	{ 0xc4c0, 0x003c },
> +	{ 0xc4c3, 0x003c },
> +	{ 0xc4d5, 0x0003 },
> +	{ 0xc4da, 0x0000 },
> +	{ 0xc4d7, 0x0001 },
> +	{ 0xc4f0, 0x0001 }
> +};
> +
> +static const s64 link_freq_tbl[] = {
> +	110529000,
> +	221184000,
> +};
> +
> +/* Elements of the structure must be ordered ascending by width & height */
> +static const struct addi9036_mode_info addi9036_mode_info_data[] = {
> +	{
> +		.width = 640,
> +		.height = 480,
> +		.pixel_rate = 36864000,
> +		.link_freq_idx = 0 /* an index in link_freq_tbl[] */
> +	},
> +	{
> +		.width = 640,
> +		.height = 960,
> +		.pixel_rate = 73728000,
> +		.link_freq_idx = 1 /* an index in link_freq_tbl[] */
> +	},
> +};
> +
> +static bool addi9306_readable_register(struct device *dev, unsigned int reg)
> +{
> +	if (((reg >= 0x4000) && (reg <= 0x6FFF)) ||
> +	    ((reg >= 0x7C00) && (reg <= 0x7FFF)) ||
> +	    ((reg >= 0xC000) && (reg <= 0xC200)) ||
> +	    ((reg >= 0xC300) && (reg <= 0xC6BF)))
> +		return true;
> +	else
> +		return false;
> +}
> +
> +static bool addi9306_writeable_register(struct device *dev, unsigned int reg)
> +{
> +	if (((reg >= 0x4000) && (reg <= 0x6FFF)) ||
> +	    ((reg >= 0x7C00) && (reg <= 0x7FFF)) ||
> +	    ((reg >= 0xC000) && (reg <= 0xC113)) ||
> +	    ((reg >= 0xC300) && (reg <= 0xC7FF)))
> +		return true;
> +	else
> +		return false;
> +}
> +
> +static const struct regmap_config addi9036_i2c_regmap_config = {
> +	.reg_bits = 16,
> +	.val_bits = 16,
> +
> +	.max_register = 0xC7FF,
> +	.writeable_reg = addi9306_writeable_register,
> +	.readable_reg = addi9306_readable_register,
> +	.cache_type = REGCACHE_NONE,
> +};
> +
> +static int addi9036_set_power_on(struct addi9036 *addi9036)
> +{
> +	int ret;
> +
> +	if (addi9036->rst_gpio)
> +		gpiod_set_value_cansleep(addi9036->rst_gpio, 0);
> +
> +	ret = regmap_register_patch(addi9036->regmap, addi9036_powerup_setting,
> +				    ARRAY_SIZE(addi9036_powerup_setting));
> +	if (ret)
> +		dev_err(addi9036->dev, "Could not set power up registers\n");
> +
> +	return ret;
> +}
> +
> +static int addi9036_set_power_off(struct addi9036 *addi9036)
> +{
> +	int ret;
> +
> +	ret = regmap_register_patch(addi9036->regmap,
> +				    addi9036_powerdown_setting,
> +				    ARRAY_SIZE(addi9036_powerdown_setting));
> +	if (ret)
> +		dev_err(addi9036->dev, "could not set power down registers\n");
> +
> +	if (addi9036->rst_gpio)
> +		gpiod_set_value_cansleep(addi9036->rst_gpio, 1);
> +
> +	return ret;
> +}
> +
> +static int addi9036_s_power(struct v4l2_subdev *sd, int on)
> +{
> +	struct addi9036 *addi9036 = to_addi9036(sd);
> +	int ret = 0;
> +
> +	mutex_lock(&addi9036->power_lock);
> +
> +	dev_dbg(addi9036->dev, "s_power: %d\n", on);
> +
> +	/* If the power count is modified from 0 to != 0 or from != 0 to 0,
> +	 * update the power state.
> +	 */
> +	if (addi9036->power_count == !on) {
> +		if (on)
> +			ret = addi9036_set_power_on(addi9036);
> +		else
> +			ret = addi9036_set_power_off(addi9036);
> +	}
> +
> +	if (!ret) {
> +		/* Update the power count. */
> +		addi9036->power_count += on ? 1 : -1;
> +		WARN(addi9036->power_count < 0, "Unbalanced power count\n");
> +		WARN(addi9036->power_count > 1, "Duplicated s_power call\n");
> +	}
> +
> +	mutex_unlock(&addi9036->power_lock);
> +
> +	return ret;
> +}
> +
> +static int addi9036_set_chip_config(struct addi9036 *addi9036,
> +				    struct v4l2_ctrl *ctrl)
> +{
> +	int index;
> +	unsigned short *reg, *val;
> +
> +	reg = (unsigned short *)(ctrl->p_new.p_u16);
> +	val = (unsigned short *)(ctrl->p_new.p_u16 + 1);
> +
> +	for (index = 0; index < ctrl->elems; index += 2) {
> +		regmap_write(addi9036->regmap, *reg, *val);
> +		reg += 2;
> +		val += 2;
> +	}
> +
> +	return 0;
> +}
> +
> +static int addi9036_s_ctrl(struct v4l2_ctrl *ctrl)
> +{
> +	struct addi9036 *addi9036 = container_of(ctrl->handler,
> +						 struct addi9036, ctrls);
> +	int ret = 0;
> +	unsigned int val;
> +
> +	switch (ctrl->id) {
> +	case V4L2_CID_AD_DEV_SET_CHIP_CONFIG_QUERY:
> +		ret = addi9036_set_chip_config(addi9036, ctrl);
> +		break;
> +	case V4L2_CID_AD_DEV_REG_READ_QUERY:
> +		ret = regmap_read(addi9036->regmap, *(u16 *)(ctrl->p_new.p_u16),
> +				  &val);
> +		if (ret)
> +			dev_warn(addi9036->dev,
> +				 "could not read from register\n");
> +		else
> +			*(u16 *)(ctrl->p_new.p_u16) = val;
> +		break;
> +	case V4L2_CID_PIXEL_RATE:
> +	case V4L2_CID_LINK_FREQ:
> +		break;
> +	default:
> +		dev_err(addi9036->dev, "%s > Unhandled: %x  param=%x\n",
> +			__func__, ctrl->id, ctrl->val);
> +		ret = -EINVAL;
> +		break;
> +	}
> +
> +	return ret;
> +}
> +
> +static const struct v4l2_ctrl_ops addi9036_ctrl_ops = {
> +	.s_ctrl = addi9036_s_ctrl,
> +};
> +
> +static const struct v4l2_ctrl_config addi9036_ctrl_chip_config = {
> +	.ops		= &addi9036_ctrl_ops,
> +	.id		= V4L2_CID_AD_DEV_SET_CHIP_CONFIG_QUERY,
> +	.name		= "chip_config",
> +	.type		= V4L2_CTRL_TYPE_U16,
> +	.def		= 0xFF,
> +	.min		= 0x00,
> +	.max		= 0xFFFF,
> +	.step		= 1,
> +	.dims		= { 2048 },
> +	.elem_size	= 2
> +};
> +
> +static const struct v4l2_ctrl_config addi9036_ctrl_reg_read = {
> +	.ops	= &addi9036_ctrl_ops,
> +	.id	= V4L2_CID_AD_DEV_REG_READ_QUERY,
> +	.name	= "reg_read",
> +	.type	= V4L2_CTRL_TYPE_U16,
> +	.def	= 0,
> +	.min	= 0x00,
> +	.max	= 0xFFFF,
> +	.step	= 1
> +};
> +
> +static int addi9036_enum_mbus_code(struct v4l2_subdev *sd,
> +				   struct v4l2_subdev_pad_config *cfg,
> +				   struct v4l2_subdev_mbus_code_enum *code)
> +{
> +	if (code->index > 0)
> +		return -EINVAL;
> +
> +	code->code = MEDIA_BUS_FMT_SBGGR12_1X12;
> +
> +	return 0;
> +}
> +
> +static int addi9036_enum_frame_size(struct v4l2_subdev *subdev,
> +				    struct v4l2_subdev_pad_config *cfg,
> +				    struct v4l2_subdev_frame_size_enum *fse)
> +{
> +	if (fse->code != MEDIA_BUS_FMT_SBGGR12_1X12)
> +		return -EINVAL;
> +
> +	if (fse->index >= ARRAY_SIZE(addi9036_mode_info_data))
> +		return -EINVAL;
> +
> +	fse->min_width = addi9036_mode_info_data[fse->index].width;
> +	fse->max_width = addi9036_mode_info_data[fse->index].width;
> +	fse->min_height = addi9036_mode_info_data[fse->index].height;
> +	fse->max_height = addi9036_mode_info_data[fse->index].height;
> +
> +	return 0;
> +}
> +
> +static struct v4l2_mbus_framefmt *
> +addi9036_get_pad_format(struct addi9036 *addi9036,
> +			struct v4l2_subdev_pad_config *cfg,
> +			unsigned int pad,
> +			enum v4l2_subdev_format_whence which)
> +{
> +	switch (which) {
> +	case V4L2_SUBDEV_FORMAT_TRY:
> +		return v4l2_subdev_get_try_format(&addi9036->sd, cfg, pad);
> +	case V4L2_SUBDEV_FORMAT_ACTIVE:
> +		return &addi9036->fmt;
> +	default:
> +		return NULL;
> +	}
> +}
> +
> +static int addi9036_get_format(struct v4l2_subdev *sd,
> +			       struct v4l2_subdev_pad_config *cfg,
> +			       struct v4l2_subdev_format *format)
> +{
> +	struct addi9036 *addi9036 = to_addi9036(sd);
> +	struct v4l2_mbus_framefmt *pad_format;
> +
> +	pad_format = addi9036_get_pad_format(addi9036, cfg, format->pad,
> +					     format->which);
> +
> +	if (!pad_format)
> +		return -EINVAL;
> +
> +	format->format = *pad_format;
> +
> +	return 0;
> +}
> +
> +static struct v4l2_rect *
> +addi9036_get_pad_crop(struct addi9036 *addi9036,
> +		      struct v4l2_subdev_pad_config *cfg,
> +		      unsigned int pad, enum v4l2_subdev_format_whence which)
> +{
> +	switch (which) {
> +	case V4L2_SUBDEV_FORMAT_TRY:
> +		return v4l2_subdev_get_try_crop(&addi9036->sd, cfg, pad);
> +	case V4L2_SUBDEV_FORMAT_ACTIVE:
> +		return &addi9036->crop;
> +	default:
> +		return NULL;
> +	}
> +}
> +
> +static const struct addi9036_mode_info *
> +addi9036_find_nearest_mode(unsigned int width, unsigned int height)
> +{
> +	unsigned int i;
> +
> +	for (i = ARRAY_SIZE(addi9036_mode_info_data) - 1; i > 0; i--) {
> +		if (addi9036_mode_info_data[i].width <= width &&
> +		    addi9036_mode_info_data[i].height <= height)
> +			break;
> +	}
> +
> +	return &addi9036_mode_info_data[i];
> +}
> +
> +static int addi9036_set_format(struct v4l2_subdev *sd,
> +			       struct v4l2_subdev_pad_config *cfg,
> +			       struct v4l2_subdev_format *format)
> +{
> +	struct addi9036 *addi9036 = to_addi9036(sd);
> +	struct v4l2_mbus_framefmt *framefmt;
> +	struct v4l2_rect *crop;
> +	const struct addi9036_mode_info *new_mode;
> +	int ret;
> +
> +	dev_dbg(addi9036->dev, "set_fmt: %x %dx%d\n",
> +		format->format.code, format->format.width,
> +		format->format.height);
> +
> +	crop = addi9036_get_pad_crop(addi9036, cfg, format->pad,
> +				     format->which);
> +
> +	if (!crop)
> +		return -EINVAL;
> +
> +	new_mode = addi9036_find_nearest_mode(format->format.width,
> +					      format->format.height);
> +	crop->width = new_mode->width;
> +	crop->height = new_mode->height;
> +
> +	if (format->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
> +		ret = v4l2_ctrl_s_ctrl_int64(addi9036->pixel_rate,
> +					     new_mode->pixel_rate);
> +		if (ret < 0)
> +			return ret;
> +
> +		ret = v4l2_ctrl_s_ctrl(addi9036->link_freq,
> +				       new_mode->link_freq_idx);
> +		if (ret < 0)
> +			return ret;
> +
> +		addi9036->current_mode = new_mode;
> +	}
> +
> +	framefmt = addi9036_get_pad_format(addi9036, cfg, format->pad,
> +					   format->which);
> +
> +	if (!framefmt)
> +		return -EINVAL;
> +
> +	framefmt->width = crop->width;
> +	framefmt->height = crop->height;
> +	framefmt->code = MEDIA_BUS_FMT_SBGGR12_1X12;
> +	framefmt->field = V4L2_FIELD_NONE;
> +	framefmt->colorspace = V4L2_COLORSPACE_SRGB;
> +
> +	format->format = *framefmt;
> +
> +	return 0;
> +}
> +
> +static int addi9036_entity_init_cfg(struct v4l2_subdev *subdev,
> +				    struct v4l2_subdev_pad_config *cfg)
> +{
> +	struct v4l2_subdev_format fmt = { 0 };
> +
> +	if (cfg)
> +		fmt.which = V4L2_SUBDEV_FORMAT_TRY;
> +	else
> +		fmt.which = V4L2_SUBDEV_FORMAT_ACTIVE;
> +
> +	fmt.format.width = 640;
> +	fmt.format.height = 960;
> +
> +	addi9036_set_format(subdev, cfg, &fmt);
> +
> +	return 0;
> +}
> +
> +static int addi9036_get_selection(struct v4l2_subdev *sd,
> +				  struct v4l2_subdev_pad_config *cfg,
> +				  struct v4l2_subdev_selection *sel)
> +{
> +	struct addi9036 *addi9036 = to_addi9036(sd);
> +
> +	if (sel->target != V4L2_SEL_TGT_CROP)
> +		return -EINVAL;
> +
> +	sel->r = *addi9036_get_pad_crop(addi9036, cfg, sel->pad, sel->which);
> +
> +	return 0;
> +}
> +
> +static int addi9036_s_stream(struct v4l2_subdev *subdev, int enable)
> +{
> +	struct addi9036 *addi9036 = to_addi9036(subdev);
> +
> +	dev_dbg(addi9036->dev, "stream %d\n", enable);
> +
> +	return 0;
> +}
> +
> +static const struct v4l2_subdev_core_ops addi9036_core_ops = {
> +	.s_power	= addi9036_s_power,
> +};
> +
> +static const struct v4l2_subdev_video_ops addi9036_video_ops = {
> +	.s_stream	= addi9036_s_stream,
> +};
> +
> +static const struct v4l2_subdev_pad_ops addi9036_subdev_pad_ops = {
> +	.init_cfg		= addi9036_entity_init_cfg,
> +	.enum_mbus_code		= addi9036_enum_mbus_code,
> +	.enum_frame_size	= addi9036_enum_frame_size,
> +	.get_fmt		= addi9036_get_format,
> +	.set_fmt		= addi9036_set_format,
> +	.get_selection		= addi9036_get_selection,
> +};
> +
> +static const struct v4l2_subdev_ops addi9036_subdev_ops = {
> +	.core	= &addi9036_core_ops,
> +	.video	= &addi9036_video_ops,
> +	.pad	= &addi9036_subdev_pad_ops,
> +};
> +
> +static int addi9036_probe(struct i2c_client *client)
> +{
> +	struct device *dev = &client->dev;
> +	struct fwnode_handle *endpoint;
> +	struct addi9036 *addi9036;
> +	int ret;
> +
> +	dev_dbg(dev, "%s: i2c addr = 0x%x\n", __func__, client->addr);
> +
> +	addi9036 = devm_kzalloc(dev, sizeof(struct addi9036), GFP_KERNEL);
> +	if (!addi9036)
> +		return -ENOMEM;
> +
> +	addi9036->dev = dev;
> +
> +	addi9036->regmap = devm_regmap_init_i2c(client,
> +						&addi9036_i2c_regmap_config);
> +	if (IS_ERR(addi9036->regmap)) {
> +		dev_err(dev, "Error initializing i2c regmap\n");
> +		return PTR_ERR(addi9036->regmap);
> +	}
> +
> +	mutex_init(&addi9036->power_lock);
> +
> +	endpoint = fwnode_graph_get_next_endpoint(dev_fwnode(dev), NULL);
> +	if (!endpoint) {
> +		dev_err(dev, "endpoint node not found\n");
> +		return -EINVAL;
> +	}
> +
> +	ret = v4l2_fwnode_endpoint_parse(endpoint, &addi9036->ep);
> +	if (ret < 0) {
> +		dev_err(dev, "parsing endpoint node failed\n");
> +		return ret;
> +	}
> +	fwnode_handle_put(endpoint);
> +
> +	if (addi9036->ep.bus_type != V4L2_MBUS_CSI2_DPHY) {
> +		dev_err(dev, "invalid bus type, must be MIPI CSI2\n");
> +		return -EINVAL;
> +	}
> +
> +	addi9036->rst_gpio = gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
> +	if (IS_ERR(addi9036->rst_gpio)) {
> +		dev_info(dev, "Unable to get \"reset\" gpio\n");
> +		return PTR_ERR(addi9036->rst_gpio);
> +	}
> +
> +	v4l2_ctrl_handler_init(&addi9036->ctrls, 4);
> +
> +	addi9036->pixel_rate = v4l2_ctrl_new_std(&addi9036->ctrls,
> +						  &addi9036_ctrl_ops,
> +						  V4L2_CID_PIXEL_RATE,
> +						  1, INT_MAX, 1, 1);
> +	addi9036->link_freq = v4l2_ctrl_new_int_menu(&addi9036->ctrls,
> +						     &addi9036_ctrl_ops,
> +						     V4L2_CID_LINK_FREQ,
> +						     ARRAY_SIZE(
> +							     link_freq_tbl) - 1,
> +						     0, link_freq_tbl);
> +	if (addi9036->link_freq)
> +		addi9036->link_freq->flags |= V4L2_CTRL_FLAG_READ_ONLY;
> +
> +	addi9036->set_chip_config = v4l2_ctrl_new_custom(&addi9036->ctrls,
> +						&addi9036_ctrl_chip_config,
> +						NULL);
> +
> +	addi9036->reg_read = v4l2_ctrl_new_custom(&addi9036->ctrls,
> +						  &addi9036_ctrl_reg_read,
> +						  NULL);
> +
> +	addi9036->sd.ctrl_handler = &addi9036->ctrls;
> +
> +	if (addi9036->ctrls.error) {
> +		dev_err(dev, "%s: control initialization error %d\n",
> +			__func__, addi9036->ctrls.error);
> +		ret = addi9036->ctrls.error;
> +		goto free_ctrl;
> +	}
> +
> +	v4l2_i2c_subdev_init(&addi9036->sd, client, &addi9036_subdev_ops);
> +	addi9036->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
> +	addi9036->pad.flags = MEDIA_PAD_FL_SOURCE;
> +	addi9036->sd.dev = &client->dev;
> +	addi9036->sd.entity.function = MEDIA_ENT_F_CAM_SENSOR;
> +
> +	ret = media_entity_pads_init(&addi9036->sd.entity, 1, &addi9036->pad);
> +
> +	if (ret < 0) {
> +		dev_err(dev, "could not register media entity\n");
> +		goto free_ctrl;
> +	}
> +
> +	ret = addi9036_s_power(&addi9036->sd, true);
> +	if (ret < 0) {
> +		dev_err(dev, "could not power up addi9036\n");
> +		goto free_entity;
> +	}
> +
> +	dev_info(dev, "addi9036 detected at address 0x%02x\n", client->addr);
> +
> +	ret = addi9036_s_power(&addi9036->sd, false);
> +	if (ret < 0) {
> +		dev_err(dev, "could not power down addi9036\n");
> +		goto free_entity;
> +	}
> +
> +	addi9036_entity_init_cfg(&addi9036->sd, NULL);
> +
> +	ret = v4l2_async_register_subdev(&addi9036->sd);
> +	if (ret < 0)
> +		dev_err(dev, "could not register v4l2 device\n");
> +
> +	return 0;
> +
> +free_entity:
> +	media_entity_cleanup(&addi9036->sd.entity);
> +free_ctrl:
> +	v4l2_ctrl_handler_free(&addi9036->ctrls);
> +	mutex_destroy(&addi9036->power_lock);
> +
> +	return ret;
> +}
> +
> +static int addi9036_remove(struct i2c_client *client)
> +{
> +	struct v4l2_subdev *sd = i2c_get_clientdata(client);
> +	struct addi9036 *addi9036 = to_addi9036(sd);
> +
> +	v4l2_async_unregister_subdev(&addi9036->sd);
> +	media_entity_cleanup(&addi9036->sd.entity);
> +	if (addi9036->rst_gpio)
> +		gpiod_put(addi9036->rst_gpio);
> +	v4l2_ctrl_handler_free(&addi9036->ctrls);
> +	mutex_destroy(&addi9036->power_lock);
> +
> +	return 0;
> +}
> +
> +static const struct i2c_device_id addi9036_id[] = {
> +	{ "addi9036", 0 },
> +	{}
> +};
> +MODULE_DEVICE_TABLE(i2c, addi9036_id);
> +
> +static const struct of_device_id addi9036_of_match[] = {
> +	{ .compatible = "adi,addi9036" },
> +	{ /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, addi9036_of_match);
> +
> +static struct i2c_driver addi9036_i2c_driver = {
> +	.driver			= {
> +		.of_match_table = addi9036_of_match,
> +		.name		= "addi9036",
> +	},
> +	.probe_new		= addi9036_probe,
> +	.remove			= addi9036_remove,
> +	.id_table		= addi9036_id,
> +};
> +
> +module_i2c_driver(addi9036_i2c_driver);
> +
> +MODULE_DESCRIPTION("Analog Devices ADDI9036 Camera Driver");
> +MODULE_AUTHOR("Bogdan Togorean");
> +MODULE_LICENSE("GPL v2");
> diff --git a/include/uapi/linux/v4l2-controls.h b/include/uapi/linux/v4l2-controls.h
> index 62271418c1be..f88b56479bc1 100644
> --- a/include/uapi/linux/v4l2-controls.h
> +++ b/include/uapi/linux/v4l2-controls.h
> @@ -198,6 +198,12 @@ enum v4l2_colorfx {
>   */
>  #define V4L2_CID_USER_ATMEL_ISC_BASE		(V4L2_CID_USER_BASE + 0x10c0)
>  
> +/*
> + * The base for the addi9036 driver controls.
> + * We reserve 16 controls for this driver.
> + */
> +#define V4L2_CID_USER_ADDI9036_BASE		(V4L2_CID_USER_BASE + 0x10e0)
> +
>  /* MPEG-class control IDs */
>  /* The MPEG controls are applicable to all codec controls
>   * and the 'MPEG' part of the define is historical */
> -- 
> 2.28.0
> 

-- 
Regards,

Laurent Pinchart

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