Re: [PATCH 2/2] media: i2c: Add driver for ST VD56G3 camera sensor

From: Tommaso Merciai
Date: Thu Apr 18 2024 - 05:17:47 EST

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In reply to: kernel test robot: "Re: [PATCH 2/2] media: i2c: Add driver for ST VD56G3 camera sensor"
Next in thread: Sylvain Petinot: "[PATCH 1/2] media: dt-bindings: Add ST VD56G3 camera sensor binding"
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Hi Sylvain,

Thanks for the patch.
Quick review on my side :)

Premise:
Unfortunately I'm not able to test this drv on my side (missing hw)
either I'm not able to get the datasheet Googling a bit.

On Wed, Apr 17, 2024 at 03:34:53PM +0200, Sylvain Petinot wrote:
> Add V4L2 sub-device driver for STMicroelectronics VD56G3 camera sensor.
> This is a 1.5 M pixel global shutter image sensor with an active array
> size of 1124 x 1364 (portrait orientation).
>
> The driver supports Mono (VD56G3) and Color (VD66GY) variants.
>
> Signed-off-by: Sylvain Petinot <sylvain.petinot@xxxxxxxxxxx>
> ---
> drivers/media/i2c/Kconfig | 11 +
> drivers/media/i2c/Makefile | 1 +
> drivers/media/i2c/st-vd56g3.c | 1619 +++++++++++++++++++++++++++++++++
> 3 files changed, 1631 insertions(+)
> create mode 100644 drivers/media/i2c/st-vd56g3.c
>
> diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
> index 56f276b920ab..a2d7271eef88 100644
> --- a/drivers/media/i2c/Kconfig
> +++ b/drivers/media/i2c/Kconfig
> @@ -657,6 +657,17 @@ config VIDEO_S5K6A3
> This is a V4L2 sensor driver for Samsung S5K6A3 raw
> camera sensor.
>
> +config VIDEO_ST_VD56G3
> + tristate "ST VD56G3 sensor support"
> + select V4L2_CCI_I2C
> + depends on OF && GPIOLIB
> + help
> + This is a Video4Linux2 sensor driver for the ST VD56G3
> + camera sensor.
> +
> + To compile this driver as a module, choose M here: the
> + module will be called st-vd56g3.
> +
> config VIDEO_ST_VGXY61
> tristate "ST VGXY61 sensor support"
> select V4L2_CCI_I2C
> diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
> index dfbe6448b549..b469cf0f8113 100644
> --- a/drivers/media/i2c/Makefile
> +++ b/drivers/media/i2c/Makefile
> @@ -124,6 +124,7 @@ obj-$(CONFIG_VIDEO_SAA717X) += saa717x.o
> obj-$(CONFIG_VIDEO_SAA7185) += saa7185.o
> obj-$(CONFIG_VIDEO_SONY_BTF_MPX) += sony-btf-mpx.o
> obj-$(CONFIG_VIDEO_ST_MIPID02) += st-mipid02.o
> +obj-$(CONFIG_VIDEO_ST_VD56G3) += st-vd56g3.o
> obj-$(CONFIG_VIDEO_ST_VGXY61) += st-vgxy61.o
> obj-$(CONFIG_VIDEO_TC358743) += tc358743.o
> obj-$(CONFIG_VIDEO_TC358746) += tc358746.o
> diff --git a/drivers/media/i2c/st-vd56g3.c b/drivers/media/i2c/st-vd56g3.c
> new file mode 100644
> index 000000000000..eff819941456
> --- /dev/null
> +++ b/drivers/media/i2c/st-vd56g3.c
> @@ -0,0 +1,1619 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * A V4L2 driver for ST VD56G3 (Mono) and VD66GY (RGB) global shutter cameras.
> + * Copyright (C) 2024, STMicroelectronics SA
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/delay.h>
> +#include <linux/gpio/consumer.h>
> +#include <linux/i2c.h>
> +#include <linux/iopoll.h>
> +#include <linux/module.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/regmap.h>
> +#include <linux/regulator/consumer.h>
> +#include <linux/units.h>
> +
> +#include <asm/unaligned.h>
> +
> +#include <media/mipi-csi2.h>
> +#include <media/v4l2-async.h>
> +#include <media/v4l2-cci.h>
> +#include <media/v4l2-ctrls.h>
> +#include <media/v4l2-device.h>
> +#include <media/v4l2-event.h>
> +#include <media/v4l2-fwnode.h>
> +#include <media/v4l2-subdev.h>
> +
> +/* Register Map */
> +#define VD56G3_REG_MODEL_ID CCI_REG16_LE(0x0000)
> +#define VD56G3_MODEL_ID 0x5603
> +#define VD56G3_REG_REVISION CCI_REG16_LE(0x0002)
> +#define VD56G3_REG_OPTICAL_REVISION CCI_REG8(0x001a)
> +#define VD56G3_OPTICAL_REVISION_MONO 0
> +#define VD56G3_OPTICAL_REVISION_BAYER 1
> +#define VD56G3_REG_SYSTEM_FSM CCI_REG8(0x0028)
> +#define VD56G3_SYSTEM_FSM_READY_TO_BOOT 0x01
> +#define VD56G3_SYSTEM_FSM_SW_STBY 0x02
> +#define VD56G3_SYSTEM_FSM_STREAMING 0x03
> +#define VD56G3_REG_APPLIED_COARSE_EXPOSURE CCI_REG16_LE(0x0064)
> +#define VD56G3_REG_APPLIED_ANALOG_GAIN CCI_REG8(0x0068)
> +#define VD56G3_REG_APPLIED_DIGITAL_GAIN CCI_REG16_LE(0x006a)
> +#define VD56G3_REG_BOOT CCI_REG8(0x0200)
> +#define VD56G3_CMD_ACK 0
> +#define VD56G3_CMD_BOOT 1
> +#define VD56G3_REG_STBY CCI_REG8(0x0201)
> +#define VD56G3_CMD_START_STREAM 1
> +#define VD56G3_REG_STREAMING CCI_REG8(0x0202)
> +#define VD56G3_CMD_STOP_STREAM 1
> +#define VD56G3_REG_EXT_CLOCK CCI_REG32_LE(0x0220)
> +#define VD56G3_REG_CLK_PLL_PREDIV CCI_REG8(0x0224)
> +#define VD56G3_REG_CLK_SYS_PLL_MULT CCI_REG8(0x0226)
> +#define VD56G3_REG_ORIENTATION CCI_REG8(0x0302)
> +#define VD56G3_REG_FORMAT_CTRL CCI_REG8(0x030a)
> +#define VD56G3_REG_OIF_CTRL CCI_REG16_LE(0x030c)
> +#define VD56G3_REG_OIF_IMG_CTRL CCI_REG8(0x030f)
> +#define VD56G3_REG_OIF_CSI_BITRATE CCI_REG16_LE(0x0312)
> +#define VD56G3_REG_DUSTER_CTRL CCI_REG8(0x0318)
> +#define VD56G3_DUSTER_DISABLE 0
> +#define VD56G3_DUSTER_ENABLE_DEF_MODULES 0x13
> +#define VD56G3_REG_ISL_ENABLE CCI_REG8(0x0333)
> +#define VD56G3_REG_DARKCAL_CTRL CCI_REG8(0x0340)
> +#define VD56G3_DARKCAL_ENABLE 1
> +#define VD56G3_DARKCAL_DISABLE_DARKAVG 2
> +#define VD56G3_REG_PATGEN_CTRL CCI_REG16_LE(0x0400)
> +#define VD56G3_PATGEN_ENABLE 1
> +#define VD56G3_PATGEN_TYPE_SHIFT 4
> +#define VD56G3_REG_AE_COLDSTART_COARSE_EXPOSURE CCI_REG16_LE(0x042a)
> +#define VD56G3_REG_AE_COLDSTART_ANALOG_GAIN CCI_REG8(0x042c)
> +#define VD56G3_REG_AE_COLDSTART_DIGITAL_GAIN CCI_REG16_LE(0x042e)
> +#define VD56G3_REG_AE_ROI_START_H CCI_REG16_LE(0x0432)
> +#define VD56G3_REG_AE_ROI_START_V CCI_REG16_LE(0x0434)
> +#define VD56G3_REG_AE_ROI_END_H CCI_REG16_LE(0x0436)
> +#define VD56G3_REG_AE_ROI_END_V CCI_REG16_LE(0x0438)
> +#define VD56G3_REG_AE_COMPENSATION CCI_REG16_LE(0x043a)
> +#define VD56G3_REG_EXP_MODE CCI_REG8(0x044c)
> +#define VD56G3_EXP_MODE_AUTO 0
> +#define VD56G3_EXP_MODE_FREEZE 1
> +#define VD56G3_EXP_MODE_MANUAL 2
> +#define VD56G3_REG_MANUAL_ANALOG_GAIN CCI_REG8(0x044d)
> +#define VD56G3_REG_MANUAL_COARSE_EXPOSURE CCI_REG16_LE(0x044e)
> +#define VD56G3_REG_MANUAL_DIGITAL_GAIN_CH0 CCI_REG16_LE(0x0450)
> +#define VD56G3_REG_MANUAL_DIGITAL_GAIN_CH1 CCI_REG16_LE(0x0452)
> +#define VD56G3_REG_MANUAL_DIGITAL_GAIN_CH2 CCI_REG16_LE(0x0454)
> +#define VD56G3_REG_MANUAL_DIGITAL_GAIN_CH3 CCI_REG16_LE(0x0456)
> +#define VD56G3_REG_FRAME_LENGTH CCI_REG16_LE(0x0458)
> +#define VD56G3_REG_Y_START CCI_REG16_LE(0x045a)
> +#define VD56G3_REG_Y_END CCI_REG16_LE(0x045c)
> +#define VD56G3_REG_OUT_ROI_X_START CCI_REG16_LE(0x045e)
> +#define VD56G3_REG_OUT_ROI_X_END CCI_REG16_LE(0x0460)
> +#define VD56G3_REG_OUT_ROI_Y_START CCI_REG16_LE(0x0462)
> +#define VD56G3_REG_OUT_ROI_Y_END CCI_REG16_LE(0x0464)
> +#define VD56G3_REG_GPIO_0_CTRL CCI_REG8(0x0467)
> +#define VD56G3_GPIOX_GPIO_IN 0x01
> +#define VD56G3_GPIOX_STROBE_MODE 0x02
> +#define VD56G3_REG_READOUT_CTRL CCI_REG8(0x047e)
> +#define READOUT_NORMAL 0x00
> +#define READOUT_DIGITAL_BINNING_X2 0x01
> +
> +/*
> + * The VD56G3 pixel array is organized as follows:
> + *
> + * +--------------------------------+
> + * | | \
> + * | +------------------------+ | |
> + * | | | | |
> + * | | | | |
> + * | | | | |
> + * | | | | |
> + * | | | | |
> + * | | Default resolution | | | Native height (1364)
> + * | | 1120 x 1360 | | |
> + * | | | | |
> + * | | | | |
> + * | | | | |
> + * | | | | |
> + * | +------------------------+ | |
> + * | | /
> + * +--------------------------------+
> + * <----------------------------->
> + * \------------------- Native width (1124)
> + *
> + * The native resolution is 1124x1364.
> + * The recommended/default resolution is 1120x1360 (multiple of 16).
> + */
> +#define VD56G3_NATIVE_WIDTH 1124
> +#define VD56G3_NATIVE_HEIGHT 1364
> +#define VD56G3_DEFAULT_WIDTH 1120
> +#define VD56G3_DEFAULT_HEIGHT 1360
> +#define VD56G3_DEFAULT_MODE 1
> +
> +/* PLL settings */
> +#define VD56G3_TARGET_PLL 804000000UL
> +#define VD56G3_VT_CLOCK_DIV 5
> +
> +/* Line length and Frame length (settings are for standard 10bits ADC mode) */
> +#define VD56G3_LINE_LENGTH_MIN 1236
> +#define VD56G3_VBLANK_MIN 110
> +#define VD56G3_FRAME_LENGTH_DEF_60FPS 2168
> +
> +/* Exposure settings */
> +#define VD56G3_EXPOSURE_MARGIN 75
> +#define VD56G3_EXPOSURE_DEFAULT 1420
> +
> +/* Output Interface settings */
> +#define VD56G3_MAX_CSI_DATA_LANES 2
> +#define VD56G3_LINK_FREQ_DEF_1LANE 750000000UL
> +#define VD56G3_LINK_FREQ_DEF_2LANES 402000000UL
> +
> +/* GPIOs */
> +#define VD56G3_NB_GPIOS 8
> +
> +/* regulator supplies */
> +static const char *const vd56g3_supply_names[] = {
> + "VCORE",
> + "VDDIO",
> + "VANA",
> +};
> +
> +#define VD56G3_NUM_SUPPLIES ARRAY_SIZE(vd56g3_supply_names)
> +
> +/* -----------------------------------------------------------------------------
> + * Models (VD56G3: Mono, VD66GY: Bayer RGB), Modes and formats
> + */
> +
> +enum vd56g3_models {
> + VD56G3_MODEL_VD56G3,
> + VD56G3_MODEL_VD66GY,
> +};
> +
> +struct vd56g3_mode {
> + u32 width;
> + u32 height;
> +};
> +
> +static const struct vd56g3_mode vd56g3_supported_modes[] = {
> + {
> + .width = VD56G3_NATIVE_WIDTH,
> + .height = VD56G3_NATIVE_HEIGHT,
> + },
> + {
> + .width = VD56G3_DEFAULT_WIDTH,
> + .height = VD56G3_DEFAULT_HEIGHT,
> + },
> + {
> + .width = 1024,
> + .height = 1280,
> + },
> + {
> + .width = 1024,
> + .height = 768,
> + },
> + {
> + .width = 768,
> + .height = 1024,
> + },
> + {
> + .width = 720,
> + .height = 1280,
> + },
> + {
> + .width = 640,
> + .height = 480,
> + },
> + {
> + .width = 480,
> + .height = 640,
> + },
> + {
> + .width = 320,
> + .height = 240,
> + },
> +};
> +
> +/*
> + * Sensor support 8bits and 10bits output in both variants
> + * - Monochrome
> + * - RGB (with all H/V flip variations)
> + */
> +static const unsigned int vd56g3_mbus_codes[2][5] = {
> + {
> + MEDIA_BUS_FMT_Y8_1X8,
> + MEDIA_BUS_FMT_SGRBG8_1X8,
> + MEDIA_BUS_FMT_SRGGB8_1X8,
> + MEDIA_BUS_FMT_SBGGR8_1X8,
> + MEDIA_BUS_FMT_SGBRG8_1X8,
> + },
> + {
> + MEDIA_BUS_FMT_Y10_1X10,
> + MEDIA_BUS_FMT_SGRBG10_1X10,
> + MEDIA_BUS_FMT_SRGGB10_1X10,
> + MEDIA_BUS_FMT_SBGGR10_1X10,
> + MEDIA_BUS_FMT_SGBRG10_1X10,
> + },
> +};
> +
> +enum vd56g3_expo_state {
> + VD56G3_EXPO_AUTO,
> + VD56G3_EXPO_AUTO_FREEZE,
> + VD56G3_EXPO_MANUAL
> +};
> +
> +struct vd56g3 {
> + struct i2c_client *i2c_client;
> + struct v4l2_subdev sd;
> + struct media_pad pad;
> + struct regulator_bulk_data supplies[VD56G3_NUM_SUPPLIES];
> + struct gpio_desc *reset_gpio;
> + struct clk *xclk;
> + struct regmap *regmap;
> + u32 ext_clock;
> + u32 pll_prediv;
> + u32 pll_mult;
> + u32 pixel_clock;
> + u16 oif_ctrl;
> + int nb_of_lane;

I think you can use u8 for nb_of_lane;

> + u32 gpios[VD56G3_NB_GPIOS];
> + unsigned long ext_leds_mask;
> + bool is_mono;
> + struct v4l2_ctrl_handler ctrl_handler;
> + struct v4l2_ctrl *hblank_ctrl;
> + struct v4l2_ctrl *vblank_ctrl;
> + struct {
> + struct v4l2_ctrl *hflip_ctrl;
> + struct v4l2_ctrl *vflip_ctrl;
> + };
> + struct v4l2_ctrl *patgen_ctrl;
> + struct {
> + struct v4l2_ctrl *ae_ctrl;
> + struct v4l2_ctrl *expo_ctrl;
> + struct v4l2_ctrl *again_ctrl;
> + struct v4l2_ctrl *dgain_ctrl;
> + };
> + struct v4l2_ctrl *ae_lock_ctrl;
> + struct v4l2_ctrl *ae_bias_ctrl;
> + struct v4l2_ctrl *led_ctrl;
> + bool streaming;
> +};
> +
> +static inline struct vd56g3 *to_vd56g3(struct v4l2_subdev *sd)
> +{
> + return container_of(sd, struct vd56g3, sd);

I think here you can use container_of_const

> +}
> +
> +static inline struct v4l2_subdev *ctrl_to_sd(struct v4l2_ctrl *ctrl)
> +{
> + return &container_of(ctrl->handler, struct vd56g3, ctrl_handler)->sd;

Same here.

> +}
> +
> +/* -----------------------------------------------------------------------------
> + * Additional i2c register helpers
> + */
> +
> +static int vd56g3_poll_reg(struct vd56g3 *sensor, u32 reg, u8 poll_val,
> + int *err)
> +{
> + unsigned int val = 0;
> + int ret;
> +
> + if (err && *err)
> + return *err;
> +
> + reg = reg & CCI_REG_ADDR_MASK;
> + ret = regmap_read_poll_timeout(sensor->regmap, reg, val,
> + (val == poll_val), 2000,
> + 500 * USEC_PER_MSEC);
> +
> + if (ret && err)
> + *err = ret;
> +
> + return ret;
> +}
> +
> +static int vd56g3_wait_state(struct vd56g3 *sensor, int state, int *err)
> +{
> + return vd56g3_poll_reg(sensor, VD56G3_REG_SYSTEM_FSM, state, err);
> +}
> +
> +/* -----------------------------------------------------------------------------
> + * Controls: definitions, helpers and handlers
> + */
> +
> +static const char *const vd56g3_tp_menu[] = { "Disabled", "Solid", "Colorbar",
> + "Gradbar", "Hgrey", "Vgrey",
> + "Dgrey", "PN28" };
> +
> +static const s64 vd56g3_ev_bias_qmenu[] = { -4000, -3500, -3000, -2500, -2000,
> + -1500, -1000, -500, 0, 500,
> + 1000, 1500, 2000, 2500, 3000,
> + 3500, 4000 };
> +
> +static const s64 vd56g3_link_freq_1lane[] = { VD56G3_LINK_FREQ_DEF_1LANE };
> +
> +static const s64 vd56g3_link_freq_2lanes[] = { VD56G3_LINK_FREQ_DEF_2LANES };
> +
> +static u8 vd56g3_get_bpp(__u32 code)
> +{
> + switch (code) {
> + case MEDIA_BUS_FMT_Y8_1X8:
> + case MEDIA_BUS_FMT_SGRBG8_1X8:
> + case MEDIA_BUS_FMT_SRGGB8_1X8:
> + case MEDIA_BUS_FMT_SBGGR8_1X8:
> + case MEDIA_BUS_FMT_SGBRG8_1X8:
> + return 8;
> + case MEDIA_BUS_FMT_Y10_1X10:
> + case MEDIA_BUS_FMT_SGRBG10_1X10:
> + case MEDIA_BUS_FMT_SRGGB10_1X10:
> + case MEDIA_BUS_FMT_SBGGR10_1X10:
> + case MEDIA_BUS_FMT_SGBRG10_1X10:
> + return 10;
> + default:
> + /* Should never happen */
> + WARN(1, "Unsupported code %d. default to 8 bpp", code);
> + }
> +
> + return 8;
> +}
> +
> +static u8 vd56g3_get_datatype(__u32 code)
> +{
> + switch (code) {
> + case MEDIA_BUS_FMT_Y8_1X8:
> + case MEDIA_BUS_FMT_SGRBG8_1X8:
> + case MEDIA_BUS_FMT_SRGGB8_1X8:
> + case MEDIA_BUS_FMT_SBGGR8_1X8:
> + case MEDIA_BUS_FMT_SGBRG8_1X8:
> + return MIPI_CSI2_DT_RAW8;
> + case MEDIA_BUS_FMT_Y10_1X10:
> + case MEDIA_BUS_FMT_SGRBG10_1X10:
> + case MEDIA_BUS_FMT_SRGGB10_1X10:
> + case MEDIA_BUS_FMT_SBGGR10_1X10:
> + case MEDIA_BUS_FMT_SGBRG10_1X10:
> + return MIPI_CSI2_DT_RAW10;
> + default:
> + /* Should never happen */
> + WARN(1, "Unsupported code %d. default to MIPI_CSI2_DT_RAW8",
> + code);
> + }
> +
> + return MIPI_CSI2_DT_RAW8;
> +}
> +
> +static int vd56g3_read_expo_cluster(struct vd56g3 *sensor, bool force_cur_val)
> +{
> + u64 exposure = 0;
> + u64 again = 0;
> + u64 dgain = 0;
> + int ret = 0;
> +
> + /*
> + * When 'force_cur_val' is enabled, save the ctrl value in 'cur.val'
> + * instead of the normal 'val', this is used during poweroff to cache
> + * volatile ctrls and enable coldstart.
> + */
> + cci_read(sensor->regmap, VD56G3_REG_APPLIED_COARSE_EXPOSURE, &exposure,
> + &ret);
> + cci_read(sensor->regmap, VD56G3_REG_APPLIED_ANALOG_GAIN, &again, &ret);
> + cci_read(sensor->regmap, VD56G3_REG_APPLIED_DIGITAL_GAIN, &dgain, &ret);
> + if (ret)
> + return ret;
> +
> + if (force_cur_val) {
> + sensor->expo_ctrl->cur.val = exposure;
> + sensor->again_ctrl->cur.val = again;
> + sensor->dgain_ctrl->cur.val = dgain;
> + } else {
> + sensor->expo_ctrl->val = exposure;
> + sensor->again_ctrl->val = again;
> + sensor->dgain_ctrl->val = dgain;
> + }
> +
> + return ret;
> +}
> +
> +static int vd56g3_update_patgen(struct vd56g3 *sensor, u32 patgen_index)
> +{
> + u32 pattern = patgen_index <= 3 ? patgen_index : patgen_index + 12;
> + u16 patgen = pattern << VD56G3_PATGEN_TYPE_SHIFT;
> + u8 duster = VD56G3_DUSTER_ENABLE_DEF_MODULES;
> + u8 darkcal = VD56G3_DARKCAL_ENABLE;
> + int ret = 0;
> +
> + if (patgen_index) {
> + patgen |= VD56G3_PATGEN_ENABLE;
> + duster = VD56G3_DUSTER_DISABLE;
> + darkcal = VD56G3_DARKCAL_DISABLE_DARKAVG;
> + }
> +
> + cci_write(sensor->regmap, VD56G3_REG_DUSTER_CTRL, duster, &ret);
> + cci_write(sensor->regmap, VD56G3_REG_DARKCAL_CTRL, darkcal, &ret);
> + cci_write(sensor->regmap, VD56G3_REG_PATGEN_CTRL, patgen, &ret);
> +
> + return ret;
> +}
> +
> +static int vd56g3_update_expo_cluster(struct vd56g3 *sensor, bool is_auto)
> +{
> + int ret = 0;
> + enum vd56g3_expo_state expo_state = is_auto ? VD56G3_EXP_MODE_AUTO :
> + VD56G3_EXP_MODE_MANUAL;
> +
> + if (sensor->ae_ctrl->is_new)
> + cci_write(sensor->regmap, VD56G3_REG_EXP_MODE, expo_state,
> + &ret);
> +
> + /* In Auto expo, set coldstart parameters */
> + if (is_auto && sensor->ae_ctrl->is_new) {
> + cci_write(sensor->regmap,
> + VD56G3_REG_AE_COLDSTART_COARSE_EXPOSURE,
> + sensor->expo_ctrl->val, &ret);
> + cci_write(sensor->regmap, VD56G3_REG_AE_COLDSTART_ANALOG_GAIN,
> + sensor->again_ctrl->val, &ret);
> + cci_write(sensor->regmap, VD56G3_REG_AE_COLDSTART_DIGITAL_GAIN,
> + sensor->dgain_ctrl->val, &ret);
> + }
> +
> + /* In Manual expo, set exposure, analog and digital gains */
> + if (!is_auto && sensor->expo_ctrl->is_new)
> + cci_write(sensor->regmap, VD56G3_REG_MANUAL_COARSE_EXPOSURE,
> + sensor->expo_ctrl->val, &ret);
> +
> + if (!is_auto && sensor->again_ctrl->is_new)
> + cci_write(sensor->regmap, VD56G3_REG_MANUAL_ANALOG_GAIN,
> + sensor->again_ctrl->val, &ret);
> +
> + if (!is_auto && sensor->dgain_ctrl->is_new) {
> + cci_write(sensor->regmap, VD56G3_REG_MANUAL_DIGITAL_GAIN_CH0,
> + sensor->dgain_ctrl->val, &ret);
> + cci_write(sensor->regmap, VD56G3_REG_MANUAL_DIGITAL_GAIN_CH1,
> + sensor->dgain_ctrl->val, &ret);
> + cci_write(sensor->regmap, VD56G3_REG_MANUAL_DIGITAL_GAIN_CH2,
> + sensor->dgain_ctrl->val, &ret);
> + cci_write(sensor->regmap, VD56G3_REG_MANUAL_DIGITAL_GAIN_CH3,
> + sensor->dgain_ctrl->val, &ret);
> + }
> +
> + return ret;
> +}
> +
> +static int vd56g3_lock_exposure(struct vd56g3 *sensor, u32 lock_val)
> +{
> + bool ae_lock = lock_val & V4L2_LOCK_EXPOSURE;
> + enum vd56g3_expo_state expo_state = ae_lock ? VD56G3_EXP_MODE_FREEZE :
> + VD56G3_EXP_MODE_AUTO;
> + int ret = 0;
> +
> + if (sensor->ae_ctrl->val == V4L2_EXPOSURE_AUTO)
> + cci_write(sensor->regmap, VD56G3_REG_EXP_MODE, expo_state,
> + &ret);
> +
> + return ret;
> +}
> +
> +static int vd56g3_write_gpiox(struct vd56g3 *sensor, unsigned long gpio_mask)
> +{
> + unsigned long io;
> + u32 gpio_val;
> + int ret = 0;
> +
> + for_each_set_bit(io, &gpio_mask, VD56G3_NB_GPIOS) {
> + gpio_val = sensor->gpios[io];
> +
> + if (gpio_val == VD56G3_GPIOX_STROBE_MODE &&
> + sensor->led_ctrl->val == V4L2_FLASH_LED_MODE_NONE)
> + gpio_val = VD56G3_GPIOX_GPIO_IN;
> +
> + cci_write(sensor->regmap, VD56G3_REG_GPIO_0_CTRL + io, gpio_val,
> + &ret);
> + }
> +
> + return ret;
> +}
> +
> +static int vd56g3_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
> +{
> + struct v4l2_subdev *sd = ctrl_to_sd(ctrl);
> + struct vd56g3 *sensor = to_vd56g3(sd);
> + struct i2c_client *client = v4l2_get_subdevdata(sd);
> + int ret = 0;
> +
> + /* Interact with HW only when it is powered ON */
> + if (!pm_runtime_get_if_in_use(&client->dev))
> + return 0;
> +
> + switch (ctrl->id) {
> + case V4L2_CID_EXPOSURE_AUTO:
> + ret = vd56g3_read_expo_cluster(sensor, false);
> + break;
> + default:
> + ret = -EINVAL;
> + break;
> + }
> +
> + pm_runtime_mark_last_busy(&client->dev);
> + pm_runtime_put_autosuspend(&client->dev);
> +
> + return ret;
> +}
> +
> +static int vd56g3_s_ctrl(struct v4l2_ctrl *ctrl)
> +{
> + struct v4l2_subdev *sd = ctrl_to_sd(ctrl);
> + struct vd56g3 *sensor = to_vd56g3(sd);
> + struct i2c_client *client = v4l2_get_subdevdata(sd);
> + const struct v4l2_rect *crop;
> + unsigned int frame_length = 0;
> + unsigned int expo_max;
> + unsigned int ae_compensation;
> + bool is_auto = false;
> + int ret;
> +
> + struct v4l2_subdev_state *state =
> + v4l2_subdev_get_locked_active_state(sd);
> + crop = v4l2_subdev_state_get_crop(state, 0);
> +
> + if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
> + return 0;
> +
> + /* Update controls state, range, etc. whatever the state of the HW */
> + switch (ctrl->id) {
> + case V4L2_CID_VBLANK:
> + frame_length = crop->height + ctrl->val;
> + expo_max = frame_length - VD56G3_EXPOSURE_MARGIN;
> + __v4l2_ctrl_modify_range(sensor->expo_ctrl, 0, expo_max, 1,
> + VD56G3_EXPOSURE_DEFAULT);
> + break;
> + case V4L2_CID_EXPOSURE_AUTO:
> + is_auto = (ctrl->val == V4L2_EXPOSURE_AUTO);
> + __v4l2_ctrl_grab(sensor->ae_lock_ctrl, !is_auto);
> + __v4l2_ctrl_grab(sensor->ae_bias_ctrl, !is_auto);
> + break;
> + default:
> + break;
> + }
> +
> + /* Interact with HW only when it is powered ON */
> + if (!pm_runtime_get_if_in_use(&client->dev))
> + return 0;
> +
> + switch (ctrl->id) {
> + case V4L2_CID_HFLIP:
> + ret = cci_write(sensor->regmap, VD56G3_REG_ORIENTATION,
> + sensor->hflip_ctrl->val |
> + (sensor->vflip_ctrl->val << 1),
> + NULL);
> + break;
> + case V4L2_CID_TEST_PATTERN:
> + ret = vd56g3_update_patgen(sensor, ctrl->val);
> + break;
> + case V4L2_CID_EXPOSURE_AUTO:
> + ret = vd56g3_update_expo_cluster(sensor, is_auto);
> + break;
> + case V4L2_CID_3A_LOCK:
> + ret = vd56g3_lock_exposure(sensor, ctrl->val);
> + break;
> + case V4L2_CID_AUTO_EXPOSURE_BIAS:
> + ae_compensation =
> + DIV_ROUND_CLOSEST((int)vd56g3_ev_bias_qmenu[ctrl->val] *
> + 256, 1000);
> + ret = cci_write(sensor->regmap, VD56G3_REG_AE_COMPENSATION,
> + ae_compensation, NULL);
> + break;
> + case V4L2_CID_VBLANK:
> + ret = cci_write(sensor->regmap, VD56G3_REG_FRAME_LENGTH,
> + frame_length, NULL);
> + break;
> + case V4L2_CID_FLASH_LED_MODE:
> + ret = vd56g3_write_gpiox(sensor, sensor->ext_leds_mask);
> + break;
> + default:
> + ret = -EINVAL;
> + break;
> + }
> +
> + pm_runtime_mark_last_busy(&client->dev);
> + pm_runtime_put_autosuspend(&client->dev);
> +
> + return ret;
> +}
> +
> +static const struct v4l2_ctrl_ops vd56g3_ctrl_ops = {
> + .g_volatile_ctrl = vd56g3_g_volatile_ctrl,
> + .s_ctrl = vd56g3_s_ctrl,
> +};
> +
> +static void vd56g3_update_controls(struct vd56g3 *sensor)
> +{
> + const struct v4l2_rect *crop;
> + unsigned int hblank;
> + unsigned int vblank_min, vblank, vblank_max;
> + unsigned int frame_length;
> + unsigned int expo_max;
> +
> + struct v4l2_subdev_state *state =
> + v4l2_subdev_get_locked_active_state(&sensor->sd);
> + crop = v4l2_subdev_state_get_crop(state, 0);
> +
> + hblank = VD56G3_LINE_LENGTH_MIN - crop->width;
> + vblank_min = VD56G3_VBLANK_MIN;
> + vblank = VD56G3_FRAME_LENGTH_DEF_60FPS - crop->height;
> + vblank_max = 0xffff - crop->height;
> + frame_length = crop->height + vblank;
> + expo_max = frame_length - VD56G3_EXPOSURE_MARGIN;
> +

--

> + /* Update blanking and exposure (ranges + values) */
> + __v4l2_ctrl_modify_range(sensor->hblank_ctrl, hblank, hblank, 1,
> + hblank);
> + __v4l2_ctrl_modify_range(sensor->vblank_ctrl, vblank_min, vblank_max, 1,
> + vblank);
> + __v4l2_ctrl_s_ctrl(sensor->vblank_ctrl, vblank);
> + __v4l2_ctrl_modify_range(sensor->expo_ctrl, 0, expo_max, 1,
> + VD56G3_EXPOSURE_DEFAULT);
> + __v4l2_ctrl_s_ctrl(sensor->expo_ctrl, VD56G3_EXPOSURE_DEFAULT);

Here you don't have to check the return value fo the __v4l2__ctrl
functions using a ret value? Or I'm completely wrong?

Please check drivers/media/i2c/imx334.c:624
imx334_update_controls

> +}
> +
> +static int vd56g3_init_controls(struct vd56g3 *sensor)
> +{
> + const struct v4l2_ctrl_ops *ops = &vd56g3_ctrl_ops;
> + struct v4l2_ctrl_handler *hdl = &sensor->ctrl_handler;
> + struct v4l2_ctrl *ctrl;
> + int ret;
> +
> + v4l2_ctrl_handler_init(hdl, 25);
> +
> + /* Horizontal & vertical flips modify bayer code on RGB variant */
> + sensor->hflip_ctrl =
> + v4l2_ctrl_new_std(hdl, ops, V4L2_CID_HFLIP, 0, 1, 1, 0);
> + if (sensor->hflip_ctrl)
> + sensor->hflip_ctrl->flags |= V4L2_CTRL_FLAG_MODIFY_LAYOUT;
> +
> + sensor->vflip_ctrl =
> + v4l2_ctrl_new_std(hdl, ops, V4L2_CID_VFLIP, 0, 1, 1, 0);
> + if (sensor->vflip_ctrl)
> + sensor->vflip_ctrl->flags |= V4L2_CTRL_FLAG_MODIFY_LAYOUT;
> +
> + sensor->patgen_ctrl =
> + v4l2_ctrl_new_std_menu_items(hdl, ops, V4L2_CID_TEST_PATTERN,
> + ARRAY_SIZE(vd56g3_tp_menu) - 1, 0,
> + 0, vd56g3_tp_menu);
> +
> + ctrl = v4l2_ctrl_new_int_menu(hdl, ops, V4L2_CID_LINK_FREQ,
> + ARRAY_SIZE(vd56g3_link_freq_1lane) - 1, 0,
> + (sensor->nb_of_lane == 2) ?
> + vd56g3_link_freq_2lanes :
> + vd56g3_link_freq_1lane);
> + if (ctrl)
> + ctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY;
> +
> + ctrl = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_PIXEL_RATE,
> + sensor->pixel_clock, sensor->pixel_clock, 1,
> + sensor->pixel_clock);

I personally prefer:
ctrl = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_PIXEL_RATE,
sensor->pixel_clock,
sensor->pixel_clock, 1,
sensor->pixel_clock);

up to you :)

> + if (ctrl)
> + ctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY;
> +
> + sensor->ae_ctrl = v4l2_ctrl_new_std_menu(hdl, ops,
> + V4L2_CID_EXPOSURE_AUTO,
> + V4L2_EXPOSURE_MANUAL, 0,
> + V4L2_EXPOSURE_AUTO);
> +
> + sensor->ae_lock_ctrl = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_3A_LOCK, 0,
> + GENMASK(2, 0), 0, 0);
> +
> + sensor->ae_bias_ctrl =
> + v4l2_ctrl_new_int_menu(hdl, ops, V4L2_CID_AUTO_EXPOSURE_BIAS,
> + ARRAY_SIZE(vd56g3_ev_bias_qmenu) - 1,
> + ARRAY_SIZE(vd56g3_ev_bias_qmenu) / 2,
> + vd56g3_ev_bias_qmenu);
> +
> + /*
> + * Analog gain [1, 8] is computed with the following logic :
> + * 32/(32 - again_reg), with again_reg in the range [0:28]
> + * Digital gain [1.00, 8.00] is coded as a Fixed Point 5.8
> + */
> + sensor->again_ctrl = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_ANALOGUE_GAIN,
> + 0, 28, 1, 0);
> + sensor->dgain_ctrl = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_DIGITAL_GAIN,
> + 0x100, 0x800, 1, 0x100);
> +
> + /*
> + * Set the exposure, horizontal and vertical blanking ctrls
> + * to hardcoded values, they will be updated in vd56g3_update_controls.
> + * Exposure being in an auto-cluster, set a significant value here.
> + */
> + sensor->expo_ctrl = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_EXPOSURE,
> + VD56G3_EXPOSURE_DEFAULT,
> + VD56G3_EXPOSURE_DEFAULT, 1,
> + VD56G3_EXPOSURE_DEFAULT);
> + sensor->hblank_ctrl =
> + v4l2_ctrl_new_std(hdl, ops, V4L2_CID_HBLANK, 1, 1, 1, 1);
> + if (sensor->hblank_ctrl)
> + sensor->hblank_ctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY;
> + sensor->vblank_ctrl =
> + v4l2_ctrl_new_std(hdl, ops, V4L2_CID_VBLANK, 1, 1, 1, 1);

Doubt on my side:

Here you flag hblank as read only. What about vblank?
Thanks in advance.

> +
> + /* Additional control based on device tree properties */
> + if (sensor->ext_leds_mask)
> + sensor->led_ctrl =
> + v4l2_ctrl_new_std_menu(hdl, ops,
> + V4L2_CID_FLASH_LED_MODE,
> + V4L2_FLASH_LED_MODE_FLASH, 0,
> + V4L2_FLASH_LED_MODE_NONE);
> +
> + if (hdl->error) {
> + ret = hdl->error;
> + goto free_ctrls;
> + }
> +
> + v4l2_ctrl_cluster(2, &sensor->hflip_ctrl);
> + v4l2_ctrl_auto_cluster(4, &sensor->ae_ctrl, V4L2_EXPOSURE_MANUAL, true);
> +
> + sensor->sd.ctrl_handler = hdl;
> + return 0;
> +
> +free_ctrls:
> + v4l2_ctrl_handler_free(hdl);
> + return ret;
> +}
> +
> +/* -----------------------------------------------------------------------------
> + * Videos ops
> + */
> +
> +static int vd56g3_stream_on(struct vd56g3 *sensor,
> + struct v4l2_subdev_state *state)
> +{
> + const struct v4l2_mbus_framefmt *format =
> + v4l2_subdev_state_get_format(state, 0);
> + const struct v4l2_rect *crop =
> + v4l2_subdev_state_get_crop(state, 0);
> + int ret = 0;
> + unsigned int csi_mbps = ((sensor->nb_of_lane == 2) ?
> + VD56G3_LINK_FREQ_DEF_2LANES :
> + VD56G3_LINK_FREQ_DEF_1LANE) * 2 / MEGA;
> + unsigned int binning;
> +
> + /* configure clocks */
> + cci_write(sensor->regmap, VD56G3_REG_EXT_CLOCK, sensor->ext_clock,
> + &ret);
> + cci_write(sensor->regmap, VD56G3_REG_CLK_PLL_PREDIV, sensor->pll_prediv,
> + &ret);
> + cci_write(sensor->regmap, VD56G3_REG_CLK_SYS_PLL_MULT, sensor->pll_mult,
> + &ret);
> +
> + /* configure output */
> + cci_write(sensor->regmap, VD56G3_REG_FORMAT_CTRL,
> + vd56g3_get_bpp(format->code), &ret);
> + cci_write(sensor->regmap, VD56G3_REG_OIF_CTRL, sensor->oif_ctrl, &ret);
> + cci_write(sensor->regmap, VD56G3_REG_OIF_CSI_BITRATE, csi_mbps, &ret);
> + cci_write(sensor->regmap, VD56G3_REG_OIF_IMG_CTRL,
> + vd56g3_get_datatype(format->code), &ret);
> + cci_write(sensor->regmap, VD56G3_REG_ISL_ENABLE, 0, &ret);
> +
> + /* configure binning mode */
> + switch (crop->width / format->width) {
> + case 1:
> + default:
> + binning = READOUT_NORMAL;
> + break;
> + case 2:
> + binning = READOUT_DIGITAL_BINNING_X2;
> + break;
> + }
> + cci_write(sensor->regmap, VD56G3_REG_READOUT_CTRL, binning, &ret);
> +
> + /* configure ROIs */
> + cci_write(sensor->regmap, VD56G3_REG_Y_START, crop->top, &ret);
> + cci_write(sensor->regmap, VD56G3_REG_Y_END,
> + crop->top + crop->height - 1, &ret);
> + cci_write(sensor->regmap, VD56G3_REG_OUT_ROI_X_START, crop->left, &ret);
> + cci_write(sensor->regmap, VD56G3_REG_OUT_ROI_X_END,
> + crop->left + crop->width - 1, &ret);
> + cci_write(sensor->regmap, VD56G3_REG_OUT_ROI_Y_START, 0, &ret);
> + cci_write(sensor->regmap, VD56G3_REG_OUT_ROI_Y_END, crop->height - 1,
> + &ret);
> + cci_write(sensor->regmap, VD56G3_REG_AE_ROI_START_H, crop->left, &ret);
> + cci_write(sensor->regmap, VD56G3_REG_AE_ROI_END_H,
> + crop->left + crop->width - 1, &ret);
> + cci_write(sensor->regmap, VD56G3_REG_AE_ROI_START_V, 0, &ret);
> + cci_write(sensor->regmap, VD56G3_REG_AE_ROI_END_V, crop->height - 1,
> + &ret);
> + if (ret)
> + return ret;
> +
> + /* Setup default GPIO values; could be overridden by V4L2 ctrl setup */
> + ret = vd56g3_write_gpiox(sensor, GENMASK(VD56G3_NB_GPIOS - 1, 0));
> + if (ret)
> + return ret;
> +
> + /* Apply settings from V4L2 ctrls */
> + ret = __v4l2_ctrl_handler_setup(&sensor->ctrl_handler);
> + if (ret)
> + return ret;
> +
> + /* start streaming */
> + cci_write(sensor->regmap, VD56G3_REG_STBY, VD56G3_CMD_START_STREAM,
> + &ret);
> + vd56g3_poll_reg(sensor, VD56G3_REG_STBY, VD56G3_CMD_ACK, &ret);
> + vd56g3_wait_state(sensor, VD56G3_SYSTEM_FSM_STREAMING, &ret);
> +
> + return ret;
> +}
> +
> +static int vd56g3_stream_off(struct vd56g3 *sensor)
> +{
> + int ret = 0;
> +
> + /* Retrieve Expo cluster to enable coldstart of AE */
> + ret = vd56g3_read_expo_cluster(sensor, true);
> +
> + cci_write(sensor->regmap, VD56G3_REG_STREAMING, VD56G3_CMD_STOP_STREAM,
> + &ret);
> + vd56g3_poll_reg(sensor, VD56G3_REG_STREAMING, VD56G3_CMD_ACK, &ret);
> + vd56g3_wait_state(sensor, VD56G3_SYSTEM_FSM_SW_STBY, &ret);
> +
> + return ret;
> +}
> +
> +static int vd56g3_s_stream(struct v4l2_subdev *sd, int enable)
> +{
> + struct vd56g3 *sensor = to_vd56g3(sd);
> + struct i2c_client *client = v4l2_get_subdevdata(sd);
> + int ret = 0;
> +
> + struct v4l2_subdev_state *state =
> + v4l2_subdev_lock_and_get_active_state(sd);
> +
> + if (enable) {
> + ret = pm_runtime_resume_and_get(&client->dev);
> + if (ret < 0)
> + goto unlock;
> + ret = vd56g3_stream_on(sensor, state);
> + if (ret) {
> + dev_err(&client->dev, "Failed to start streaming\n");
> + pm_runtime_put_sync(&client->dev);
> + }
> + } else {
> + vd56g3_stream_off(sensor);
> + pm_runtime_mark_last_busy(&client->dev);
> + pm_runtime_put_autosuspend(&client->dev);
> + }
> +
> +unlock:
> + v4l2_subdev_unlock_state(state);
> + if (!ret) {
> + sensor->streaming = enable;
> + v4l2_ctrl_grab(sensor->hflip_ctrl, enable);
> + v4l2_ctrl_grab(sensor->vflip_ctrl, enable);
> + v4l2_ctrl_grab(sensor->patgen_ctrl, enable);
> + }
> +
> + return ret;
> +}
> +
> +static const struct v4l2_subdev_video_ops vd56g3_video_ops = {
> + .s_stream = vd56g3_s_stream,
> +};
> +
> +/* -----------------------------------------------------------------------------
> + * Pad ops
> + */
> +
> +/* Media bus code is dependent of :
> + * - 8bits or 10bits output
> + * - variant : Mono or RGB
> + * - H/V flips parameters in case of RGB
> + */
> +static u32 vd56g3_get_mbus_code(struct vd56g3 *sensor, u32 code)
> +{
> + unsigned int i_bpp;
> + unsigned int j;
> +
> + for (i_bpp = 0; i_bpp < ARRAY_SIZE(vd56g3_mbus_codes); i_bpp++) {
> + for (j = 0; j < ARRAY_SIZE(vd56g3_mbus_codes[i_bpp]); j++) {
> + if (vd56g3_mbus_codes[i_bpp][j] == code)
> + goto endloops;
> + }
> + }
> +
> +endloops:
> + if (i_bpp >= ARRAY_SIZE(vd56g3_mbus_codes))
> + i_bpp = 0;
> +
> + if (sensor->is_mono)
> + j = 0;
> + else
> + j = 1 + (sensor->hflip_ctrl->val ? 1 : 0) +
> + (sensor->vflip_ctrl->val ? 2 : 0);
> +
> + return vd56g3_mbus_codes[i_bpp][j];
> +}
> +
> +static int vd56g3_enum_mbus_code(struct v4l2_subdev *sd,
> + struct v4l2_subdev_state *sd_state,
> + struct v4l2_subdev_mbus_code_enum *code)
> +{
> + struct vd56g3 *sensor = to_vd56g3(sd);
> +
> + if (code->index >= ARRAY_SIZE(vd56g3_mbus_codes))
> + return -EINVAL;
> +
> + code->code =
> + vd56g3_get_mbus_code(sensor, vd56g3_mbus_codes[code->index][0]);
> +
> + return 0;
> +}
> +
> +static int vd56g3_enum_frame_size(struct v4l2_subdev *sd,
> + struct v4l2_subdev_state *sd_state,
> + struct v4l2_subdev_frame_size_enum *fse)
> +{
> + if (fse->index >= ARRAY_SIZE(vd56g3_supported_modes))
> + return -EINVAL;
> +
> + fse->min_width = vd56g3_supported_modes[fse->index].width;
> + fse->max_width = fse->min_width;
> + fse->min_height = vd56g3_supported_modes[fse->index].height;
> + fse->max_height = fse->min_height;
> +
> + return 0;
> +}
> +
> +static void vd56g3_update_img_pad_format(struct vd56g3 *sensor,
> + const struct vd56g3_mode *mode,
> + u32 mbus_code,
> + struct v4l2_mbus_framefmt *mbus_fmt)
> +{
> + mbus_fmt->width = mode->width;
> + mbus_fmt->height = mode->height;
> + mbus_fmt->code = vd56g3_get_mbus_code(sensor, mbus_code);
> + mbus_fmt->colorspace = V4L2_COLORSPACE_RAW;
> + mbus_fmt->field = V4L2_FIELD_NONE;
> + mbus_fmt->ycbcr_enc = V4L2_YCBCR_ENC_DEFAULT;
> + mbus_fmt->quantization = V4L2_QUANTIZATION_FULL_RANGE;
> + mbus_fmt->xfer_func = V4L2_XFER_FUNC_NONE;
> +}
> +
> +static int vd56g3_set_pad_fmt(struct v4l2_subdev *sd,
> + struct v4l2_subdev_state *sd_state,
> + struct v4l2_subdev_format *sd_fmt)
> +{
> + struct vd56g3 *sensor = to_vd56g3(sd);
> + const struct vd56g3_mode *new_mode;
> + struct v4l2_rect pad_crop;
> + unsigned int binning;
> +
> + if (sensor->streaming)
> + return -EBUSY;
> +
> + new_mode = v4l2_find_nearest_size(vd56g3_supported_modes,
> + ARRAY_SIZE(vd56g3_supported_modes),
> + width, height, sd_fmt->format.width,
> + sd_fmt->format.height);
> +
> + vd56g3_update_img_pad_format(sensor, new_mode, sd_fmt->format.code,
> + &sd_fmt->format);
> +
> + /* Compute crop rectangle (maximized via binning) */
> + binning = min(VD56G3_NATIVE_WIDTH / sd_fmt->format.width,
> + VD56G3_NATIVE_HEIGHT / sd_fmt->format.height);
> + binning = min(binning, 2U);
> + pad_crop.width = sd_fmt->format.width * binning;
> + pad_crop.height = sd_fmt->format.height * binning;
> + pad_crop.left = (VD56G3_NATIVE_WIDTH - pad_crop.width) / 2;
> + pad_crop.top = (VD56G3_NATIVE_HEIGHT - pad_crop.height) / 2;
> +
> + /* Update active state's format and crop */
> + *v4l2_subdev_state_get_format(sd_state, sd_fmt->pad) = sd_fmt->format;
> + *v4l2_subdev_state_get_crop(sd_state, sd_fmt->pad) = pad_crop;
> +
> + if (sd_fmt->which == V4L2_SUBDEV_FORMAT_ACTIVE)
> + vd56g3_update_controls(sensor);
> +
> + return 0;
> +}
> +
> +static int vd56g3_get_selection(struct v4l2_subdev *sd,
> + struct v4l2_subdev_state *sd_state,
> + struct v4l2_subdev_selection *sel)
> +{
> + switch (sel->target) {
> + case V4L2_SEL_TGT_CROP:
> + sel->r = *v4l2_subdev_state_get_crop(sd_state, 0);
> + break;
> + case V4L2_SEL_TGT_NATIVE_SIZE:
> + case V4L2_SEL_TGT_CROP_DEFAULT:
> + case V4L2_SEL_TGT_CROP_BOUNDS:
> + sel->r.top = 0;
> + sel->r.left = 0;
> + sel->r.width = VD56G3_NATIVE_WIDTH;
> + sel->r.height = VD56G3_NATIVE_HEIGHT;
> + break;
> + default:
> + return -EINVAL;
> + }
> +
> + return 0;
> +}
> +
> +static int vd56g3_init_state(struct v4l2_subdev *sd,
> + struct v4l2_subdev_state *sd_state)
> +{
> + unsigned int def_mode = VD56G3_DEFAULT_MODE;
> + struct v4l2_subdev_format fmt = {
> + .which = V4L2_SUBDEV_FORMAT_TRY,
> + .pad = 0,
> + .format = {
> + .code = vd56g3_mbus_codes[0][0],
> + .width = vd56g3_supported_modes[def_mode].width,
> + .height = vd56g3_supported_modes[def_mode].height,
> + },
> + };
> +
> + vd56g3_set_pad_fmt(sd, sd_state, &fmt);
> + return 0;
> +}
> +
> +static const struct v4l2_subdev_core_ops vd56g3_core_ops = {
> + .subscribe_event = v4l2_ctrl_subdev_subscribe_event,
> + .unsubscribe_event = v4l2_event_subdev_unsubscribe,
> +};
> +
> +static const struct v4l2_subdev_pad_ops vd56g3_pad_ops = {
> + .enum_mbus_code = vd56g3_enum_mbus_code,
> + .enum_frame_size = vd56g3_enum_frame_size,
> + .get_fmt = v4l2_subdev_get_fmt,
> + .set_fmt = vd56g3_set_pad_fmt,
> + .get_selection = vd56g3_get_selection,
> +};
> +
> +static const struct v4l2_subdev_ops vd56g3_subdev_ops = {
> + .core = &vd56g3_core_ops,
> + .video = &vd56g3_video_ops,
> + .pad = &vd56g3_pad_ops,
> +};
> +
> +static const struct media_entity_operations vd56g3_subdev_entity_ops = {
> + .link_validate = v4l2_subdev_link_validate,
> +};
> +
> +static const struct v4l2_subdev_internal_ops vd56g3_internal_ops = {
> + .init_state = vd56g3_init_state,
> +};
> +
> +/* -----------------------------------------------------------------------------
> + * Power management
> + */
> +
> +static int vd56g3_boot(struct vd56g3 *sensor)
> +{
> + int ret = 0;
> +
> + cci_write(sensor->regmap, VD56G3_REG_BOOT, VD56G3_CMD_BOOT, &ret);
> + vd56g3_poll_reg(sensor, VD56G3_REG_BOOT, VD56G3_CMD_ACK, &ret);
> + vd56g3_wait_state(sensor, VD56G3_SYSTEM_FSM_SW_STBY, &ret);
> +
> + return ret;
> +}
> +
> +static int vd56g3_power_on(struct vd56g3 *sensor)
> +{
> + struct i2c_client *client = sensor->i2c_client;
> + int ret;
> +
> + ret = regulator_bulk_enable(VD56G3_NUM_SUPPLIES, sensor->supplies);
> + if (ret) {
> + dev_err(&client->dev, "Failed to enable regulators %d", ret);
> + return ret;
> + }
> +
> + ret = clk_prepare_enable(sensor->xclk);
> + if (ret) {
> + dev_err(&client->dev, "Failed to enable clock %d", ret);
> + goto disable_reg;
> + }
> +
> + gpiod_set_value_cansleep(sensor->reset_gpio, 0);
> + ret = vd56g3_wait_state(sensor, VD56G3_SYSTEM_FSM_READY_TO_BOOT, NULL);
> + if (ret) {
> + dev_err(&client->dev, "Sensor reset failed %d\n", ret);
> + goto disable_clock;
> + }
> +
> + return 0;
> +
> +disable_clock:
> + clk_disable_unprepare(sensor->xclk);
> + gpiod_set_value_cansleep(sensor->reset_gpio, 1);
> +disable_reg:
> + regulator_bulk_disable(VD56G3_NUM_SUPPLIES, sensor->supplies);
> +
> + return ret;
> +}
> +
> +static int vd56g3_power_off(struct vd56g3 *sensor)
> +{
> + clk_disable_unprepare(sensor->xclk);
> + gpiod_set_value_cansleep(sensor->reset_gpio, 1);
> + regulator_bulk_disable(VD56G3_NUM_SUPPLIES, sensor->supplies);
> + return 0;
> +}
> +
> +static int vd56g3_runtime_resume(struct device *dev)
> +{
> + struct v4l2_subdev *sd = dev_get_drvdata(dev);
> + struct vd56g3 *sensor = to_vd56g3(sd);
> + struct i2c_client *client = sensor->i2c_client;
> + int ret;
> +
> + ret = vd56g3_power_on(sensor);
> + if (ret) {
> + dev_err(&client->dev, "Failed to power on %d", ret);
> + return ret;
> + }
> +
> + ret = vd56g3_boot(sensor);
> + if (ret) {
> + dev_err(&client->dev, "sensor boot failed %d", ret);
> + return ret;
> + }
> +
> + return ret;
> +}
> +
> +static int vd56g3_runtime_suspend(struct device *dev)
> +{
> + struct v4l2_subdev *sd = dev_get_drvdata(dev);
> + struct vd56g3 *sensor = to_vd56g3(sd);
> +
> + return vd56g3_power_off(sensor);
> +}
> +
> +static const struct dev_pm_ops vd56g3_pm_ops = {
> + SET_RUNTIME_PM_OPS(vd56g3_runtime_suspend, vd56g3_runtime_resume, NULL)
> +};
> +
> +/* -----------------------------------------------------------------------------
> + * Probe and initialization
> + */
> +
> +static int vd56g3_check_csi_conf(struct vd56g3 *sensor,
> + struct fwnode_handle *endpoint)
> +{
> + struct i2c_client *client = sensor->i2c_client;
> + struct v4l2_fwnode_endpoint ep = { .bus_type = V4L2_MBUS_CSI2_DPHY };
> + u32 phy_data_lanes[VD56G3_MAX_CSI_DATA_LANES] = { ~0, ~0 };
> + int n_lanes;

use u8 for n_lanes

> + int frequency;

use u64

> + int p, l;
> + int ret = 0;
> +
> + ret = v4l2_fwnode_endpoint_alloc_parse(endpoint, &ep);
> + if (ret)
> + return -EINVAL;
> +
> + /* Check lanes number */
> + n_lanes = ep.bus.mipi_csi2.num_data_lanes;
> + if (n_lanes != 1 && n_lanes != 2) {
> + dev_err(&client->dev, "Invalid data lane number %d\n", n_lanes);
> + ret = -EINVAL;
> + goto done;
> + }
> + sensor->nb_of_lane = n_lanes;
> +
> + /* Clock lane must be first */
> + if (ep.bus.mipi_csi2.clock_lane != 0) {
> + dev_err(&client->dev, "Clk lane must be mapped to lane 0\n");
> + ret = -EINVAL;
> + goto done;
> + }
> +
> + /* Prepare Output Interface conf based on lane settings
> + * logical to physical lane conversion (+ pad remaining slots)
> + */
> + for (l = 0; l < n_lanes; l++)
> + phy_data_lanes[ep.bus.mipi_csi2.data_lanes[l] - 1] = l;
> + for (p = 0; p < VD56G3_MAX_CSI_DATA_LANES; p++) {
> + if (phy_data_lanes[p] != ~0)
> + continue;
> + phy_data_lanes[p] = l;
> + l++;
> + }
> + sensor->oif_ctrl = n_lanes |
> + (ep.bus.mipi_csi2.lane_polarities[0] << 3) |
> + ((phy_data_lanes[0]) << 4) |
> + (ep.bus.mipi_csi2.lane_polarities[1] << 6) |
> + ((phy_data_lanes[1]) << 7) |
> + (ep.bus.mipi_csi2.lane_polarities[2] << 9);
> +
> + /* Check link frequency */
> + if (!ep.nr_of_link_frequencies) {
> + dev_err(&client->dev, "link-frequency not found in DT\n");
> + ret = -EINVAL;
> + goto done;
> + }
> + frequency = (n_lanes == 2) ? VD56G3_LINK_FREQ_DEF_2LANES :
> + VD56G3_LINK_FREQ_DEF_1LANE;
> + if (ep.nr_of_link_frequencies != 1 ||
> + ep.link_frequencies[0] != frequency) {
> + dev_err(&client->dev, "Link frequency not supported: %lld\n",
> + ep.link_frequencies[0]);
> + ret = -EINVAL;
> + goto done;
> + }
> +
> +done:
> + v4l2_fwnode_endpoint_free(&ep);
> + return ret;
> +}
> +
> +static int vd56g3_parse_dt_gpios_array(struct vd56g3 *sensor, char *prop_name,
> + u32 *array, int *nb)
> +{
> + struct i2c_client *client = sensor->i2c_client;
> + struct device_node *np = client->dev.of_node;
> + unsigned int i;
> +
> + *nb = of_property_read_variable_u32_array(np, prop_name, array, 0,
> + VD56G3_NB_GPIOS);
> +
> + if (*nb == -EINVAL) {
> + *nb = 0;
> + return *nb;
> + } else if (*nb < 0) {
> + dev_err(&client->dev, "Failed to read %s prop\n", prop_name);
> + return *nb;
> + }
> +
> + for (i = 0; i < *nb; i++) {
> + if (array[i] >= VD56G3_NB_GPIOS) {
> + dev_err(&client->dev, "Invalid GPIO : %d\n", array[i]);
> + return -EINVAL;
> + }
> + }
> +
> + return 0;
> +}
> +
> +static int vd56g3_parse_dt_gpios(struct vd56g3 *sensor)
> +{
> + u32 led_gpios[VD56G3_NB_GPIOS];
> + int nb_gpios_leds;
> + int ret;
> + unsigned int i;
> +
> + /* Initialize GPIOs to default */
> + for (i = 0; i < VD56G3_NB_GPIOS; i++)
> + sensor->gpios[i] = VD56G3_GPIOX_GPIO_IN;
> + sensor->ext_leds_mask = 0;
> +
> + /* Take into account optional 'st,leds' output for GPIOs */
> + ret = vd56g3_parse_dt_gpios_array(sensor, "st,leds", led_gpios,
> + &nb_gpios_leds);
> + if (ret)
> + return ret;
> + for (i = 0; i < nb_gpios_leds; i++) {
> + sensor->gpios[led_gpios[i]] = VD56G3_GPIOX_STROBE_MODE;
> + set_bit(led_gpios[i], &sensor->ext_leds_mask);
> + }
> +
> + return 0;
> +}
> +
> +static int vd56g3_parse_dt(struct vd56g3 *sensor)
> +{
> + struct i2c_client *client = sensor->i2c_client;
> + struct device *dev = &client->dev;
> + struct fwnode_handle *endpoint;
> + int ret;
> +
> + endpoint = fwnode_graph_get_endpoint_by_id(dev_fwnode(dev), 0, 0, 0);
> + if (!endpoint) {
> + dev_err(dev, "endpoint node not found\n");
> + return -EINVAL;
> + }
> +
> + ret = vd56g3_check_csi_conf(sensor, endpoint);
> + fwnode_handle_put(endpoint);
> + if (ret)
> + return ret;
> +
> + ret = vd56g3_parse_dt_gpios(sensor);
> + if (ret)
> + return ret;
> +
> + return 0;
> +}
> +
> +static int vd56g3_get_regulators(struct vd56g3 *sensor)
> +{
> + int i;
> +
> + for (i = 0; i < VD56G3_NUM_SUPPLIES; i++)
> + sensor->supplies[i].supply = vd56g3_supply_names[i];
> +
> + return devm_regulator_bulk_get(&sensor->i2c_client->dev,
> + VD56G3_NUM_SUPPLIES, sensor->supplies);
> +}
> +
> +static int vd56g3_prepare_clock_tree(struct vd56g3 *sensor)
> +{
> + struct i2c_client *client = sensor->i2c_client;
> + const unsigned int predivs[] = { 1, 2, 4 };
> + u32 pll_out;
> + int i;
> +
> + /* External clock must be in [6Mhz-27Mhz] */
> + if (sensor->ext_clock < 6 * HZ_PER_MHZ ||
> + sensor->ext_clock > 27 * HZ_PER_MHZ) {
> + dev_err(&client->dev,
> + "Only 6Mhz-27Mhz clock range supported. Provided %lu MHz\n",
> + sensor->ext_clock / HZ_PER_MHZ);
> + return -EINVAL;
> + }
> +
> + /* PLL input should be in [6Mhz-12Mhz[ */
> + for (i = 0; i < ARRAY_SIZE(predivs); i++) {
> + sensor->pll_prediv = predivs[i];
> + if (sensor->ext_clock / sensor->pll_prediv < 12 * HZ_PER_MHZ)
> + break;
> + }
> +
> + /* PLL output clock must be as close as possible to 804Mhz */
> + sensor->pll_mult = (VD56G3_TARGET_PLL * sensor->pll_prediv +
> + sensor->ext_clock / 2) /
> + sensor->ext_clock;
> + pll_out = sensor->ext_clock * sensor->pll_mult / sensor->pll_prediv;
> +
> + /* Target Pixel Clock for standard 10bit ADC mode : 160.8Mhz */
> + sensor->pixel_clock = pll_out / VD56G3_VT_CLOCK_DIV;
> +
> + return 0;
> +}
> +
> +static int vd56g3_detect(struct vd56g3 *sensor)
> +{
> + struct i2c_client *client = sensor->i2c_client;
> + struct device *dev = &client->dev;
> + unsigned int model;
> + u64 model_id = 0;
> + u64 device_revision = 0;
> + u64 optical_revision = 0;
> + int ret = 0;
> +
> + model = (uintptr_t)device_get_match_data(dev);
> +
> + cci_read(sensor->regmap, VD56G3_REG_MODEL_ID, &model_id, &ret);
> + if (ret)
> + return ret;
> +
> + if (model_id != VD56G3_MODEL_ID) {
> + dev_warn(&client->dev, "Unsupported sensor id %x",
> + (u16)model_id);
> + return -ENODEV;
> + }
> +
> + cci_read(sensor->regmap, VD56G3_REG_REVISION, &device_revision, &ret);
> + if (ret)
> + return ret;
> +
> + if ((device_revision >> 8) != 0x31) {

What about create a define that explain 0x31 number to avoid magic
number?

#define VD56G3_DEV_CUTV = 0x31?

> + dev_warn(&client->dev, "Unsupported Cut version %x",
> + (u16)device_revision);
> + return -ENODEV;
> + }
> +
> + cci_read(sensor->regmap, VD56G3_REG_OPTICAL_REVISION, &optical_revision,
> + &ret);
> + if (ret)
> + return ret;
> +
> + sensor->is_mono =
> + ((optical_revision & 1) == VD56G3_OPTICAL_REVISION_MONO);
> + if ((sensor->is_mono && model == VD56G3_MODEL_VD66GY) ||
> + (!sensor->is_mono && model == VD56G3_MODEL_VD56G3)) {
> + dev_warn(&client->dev,
> + "Found %s sensor, while %s model is defined in DT",
> + (sensor->is_mono) ? "Mono" : "Bayer",
> + (model == VD56G3_MODEL_VD56G3) ? "vd56g3" : "vd66gy");
> + return -ENODEV;
> + }
> +
> + return 0;
> +}
> +
> +static int vd56g3_subdev_init(struct vd56g3 *sensor)
> +{
> + struct i2c_client *client = sensor->i2c_client;
> + int ret;
> +
> + /* Init sub device */
> + v4l2_i2c_subdev_init(&sensor->sd, client, &vd56g3_subdev_ops);
> + sensor->sd.internal_ops = &vd56g3_internal_ops;
> + sensor->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE |
> + V4L2_SUBDEV_FL_HAS_EVENTS;
> + sensor->sd.entity.ops = &vd56g3_subdev_entity_ops;
> +
> + /* Init source pad */
> + sensor->pad.flags = MEDIA_PAD_FL_SOURCE;
> + sensor->sd.entity.function = MEDIA_ENT_F_CAM_SENSOR;
> + ret = media_entity_pads_init(&sensor->sd.entity, 1, &sensor->pad);
> + if (ret) {
> + dev_err(&client->dev, "Failed to init media entity : %d", ret);
> + return ret;
> + }
> +
> + /* Init controls */
> + ret = vd56g3_init_controls(sensor);
> + if (ret) {
> + dev_err(&client->dev, "Controls initialization failed %d", ret);
> + goto err_media;
> + }
> +
> + /* Init vd56g3 struct : default resolution + raw8 */
> + sensor->streaming = false;
> + sensor->sd.state_lock = sensor->ctrl_handler.lock;
> + ret = v4l2_subdev_init_finalize(&sensor->sd);
> + if (ret) {
> + dev_err(&client->dev, "subdev init error: %d", ret);
> + goto err_ctrls;
> + }
> +
> + vd56g3_update_controls(sensor);
> +
> + return 0;
> +
> +err_ctrls:
> + v4l2_ctrl_handler_free(sensor->sd.ctrl_handler);
> +
> +err_media:
> + media_entity_cleanup(&sensor->sd.entity);
> + return ret;
> +}
> +
> +static void vd56g3_subdev_cleanup(struct vd56g3 *sensor)
> +{
> + v4l2_async_unregister_subdev(&sensor->sd);
> + v4l2_subdev_cleanup(&sensor->sd);
> + media_entity_cleanup(&sensor->sd.entity);
> + v4l2_ctrl_handler_free(sensor->sd.ctrl_handler);
> +}
> +
> +static int vd56g3_probe(struct i2c_client *client)
> +{
> + struct device *dev = &client->dev;
> + struct vd56g3 *sensor;
> + int ret;
> +
> + sensor = devm_kzalloc(dev, sizeof(*sensor), GFP_KERNEL);
> + if (!sensor)
> + return -ENOMEM;
> +
> + sensor->i2c_client = client;
> +
> + ret = vd56g3_parse_dt(sensor);
> + if (ret) {
> + dev_err(&client->dev, "Failed to parse Device Tree : %d", ret);

Why not dev_err_probe here?

> + return ret;
> + }
> +
> + /* Get (and check) resources : power regs, ext clock, reset gpio */
> + ret = vd56g3_get_regulators(sensor);
> + if (ret)
> + return dev_err_probe(dev, ret, "Failed to get regulators.");
> +
> + sensor->xclk = devm_clk_get(dev, NULL);
> + if (IS_ERR(sensor->xclk))
> + return dev_err_probe(dev, PTR_ERR(sensor->xclk),
> + "Failed to get xclk.");
> + sensor->ext_clock = clk_get_rate(sensor->xclk);

What about use of xclk_freq?
I think this is more understandable

sensor->xclk
sensor->xclk_freq

better I think :)

> + ret = vd56g3_prepare_clock_tree(sensor);
> + if (ret)
> + return ret;
> +
> + sensor->reset_gpio =
> + devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
> + if (IS_ERR(sensor->reset_gpio))
> + return dev_err_probe(dev, PTR_ERR(sensor->reset_gpio),
> + "Failed to get reset gpio.");
> +
> + sensor->regmap = devm_cci_regmap_init_i2c(client, 16);
> + if (IS_ERR(sensor->regmap))
> + return dev_err_probe(dev, PTR_ERR(sensor->regmap),
> + "Failed to init regmap.");
> +
> + /* Power ON */
> + ret = vd56g3_power_on(sensor);
> + if (ret) {
> + dev_err(&client->dev, "Sensor power on failed : %d", ret);

dev_err_probe?

> + return ret;
> + }
> +
> + /* Enable PM runtime with autosuspend (sensor being ON, set active) */
> + pm_runtime_set_active(dev);
> + pm_runtime_get_noresume(dev);
> + pm_runtime_enable(dev);
> + pm_runtime_set_autosuspend_delay(dev, 1000);
> + pm_runtime_use_autosuspend(dev);
> +
> + /* Check HW model/version */
> + ret = vd56g3_boot(sensor);
> + if (ret) {
> + dev_err(&client->dev, "Sensor boot failed : %d", ret);
> + goto err_power_off;
> + }
> +
> + ret = vd56g3_detect(sensor);
> + if (ret) {
> + dev_err(&client->dev, "Sensor detect failed : %d", ret);
> + goto err_power_off;
> + }
> +
> + /* Initialize, then register V4L2 subdev */
> + ret = vd56g3_subdev_init(sensor);
> + if (ret) {
> + dev_err(&client->dev, "V4l2 init failed : %d", ret);
> + goto err_power_off;
> + }
> +
> + ret = v4l2_async_register_subdev(&sensor->sd);
> + if (ret) {
> + dev_err(&client->dev, "async subdev register failed %d", ret);
> + goto err_subdev;
> + }
> +
> + /* Sensor could now be powered off (after the autosuspend delay) */
> + pm_runtime_mark_last_busy(dev);
> + pm_runtime_put_autosuspend(dev);
> +
> + dev_dbg(&client->dev, "Successfully probe %s sensor",
> + (sensor->is_mono) ? "vd56g3" : "vd66gy");
> +
> + return 0;
> +
> +err_subdev:
> + vd56g3_subdev_cleanup(sensor);
> +err_power_off:
> + pm_runtime_disable(dev);
> + pm_runtime_put_noidle(dev);
> + vd56g3_power_off(sensor);
> + return ret;
> +}
> +
> +static void vd56g3_remove(struct i2c_client *client)
> +{
> + struct v4l2_subdev *sd = i2c_get_clientdata(client);
> + struct vd56g3 *sensor = to_vd56g3(sd);
> +
> + vd56g3_subdev_cleanup(sensor);
> +
> + pm_runtime_disable(&client->dev);
> + if (!pm_runtime_status_suspended(&client->dev))
> + vd56g3_power_off(sensor);
> + pm_runtime_set_suspended(&client->dev);
> +}
> +
> +static const struct of_device_id vd56g3_dt_ids[] = {
> + { .compatible = "st,st-vd56g3", .data = (void *)VD56G3_MODEL_VD56G3 },
> + { .compatible = "st,st-vd66gy", .data = (void *)VD56G3_MODEL_VD66GY },
> + { /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, vd56g3_dt_ids);
> +
> +static struct i2c_driver vd56g3_i2c_driver = {
> + .driver = {
> + .name = "st-vd56g3",
> + .of_match_table = vd56g3_dt_ids,
> + .pm = &vd56g3_pm_ops,
> + },
> + .probe = vd56g3_probe,
> + .remove = vd56g3_remove,
> +};
> +
> +module_i2c_driver(vd56g3_i2c_driver);
> +
> +MODULE_AUTHOR("Benjamin Mugnier <benjamin.mugnier@xxxxxxxxxxx>");
> +MODULE_AUTHOR("Mickael Guene <mickael.guene@xxxxxx>");
> +MODULE_AUTHOR("Sylvain Petinot <sylvain.petinot@xxxxxxxxxxx>");
> +MODULE_DESCRIPTION("ST VD56G3 sensor driver");
> +MODULE_LICENSE("GPL");
> --
> 2.17.1
>
>

Hope this help :)

Thanks & Regards,
Tommaso

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