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Date:   Mon, 11 Dec 2023 20:08:24 +0200
From:   Laurent Pinchart <laurent.pinchart@ideasonboard.com>
To:     Mikhail Rudenko <mike.rudenko@gmail.com>
Cc:     linux-media@vger.kernel.org, linux-kernel@vger.kernel.org,
        Sakari Ailus <sakari.ailus@linux.intel.com>,
        Jacopo Mondi <jacopo@jmondi.org>,
        Tommaso Merciai <tommaso.merciai@amarulasolutions.com>,
        Christophe JAILLET <christophe.jaillet@wanadoo.fr>,
        Dave Stevenson <dave.stevenson@raspberrypi.com>,
        Mauro Carvalho Chehab <mchehab@kernel.org>
Subject: Re: [PATCH 03/19] media: i2c: ov4689: CCI conversion
Message-ID: <20231211180824.GB27535@pendragon.ideasonboard.com>
References: <20231211175023.1680247-1-mike.rudenko@gmail.com>
 <20231211175023.1680247-4-mike.rudenko@gmail.com>
MIME-Version: 1.0
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In-Reply-To: <20231211175023.1680247-4-mike.rudenko@gmail.com>
Precedence: bulk

Hi Mikhail,

Thank you for the patch.

On Mon, Dec 11, 2023 at 08:50:06PM +0300, Mikhail Rudenko wrote:
> Convert the i2c register accesses to utilize the CCI helper library
> rather than relying on driver-specific functions. There are no
> intended functional changes.
> 
> Signed-off-by: Mikhail Rudenko <mike.rudenko@gmail.com>
> ---
>  drivers/media/i2c/Kconfig  |   1 +
>  drivers/media/i2c/ov4689.c | 361 ++++++++++++++-----------------------
>  2 files changed, 140 insertions(+), 222 deletions(-)
> 
> diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
> index 59ee0ca2c978..adf71d2b3b03 100644
> --- a/drivers/media/i2c/Kconfig
> +++ b/drivers/media/i2c/Kconfig
> @@ -374,6 +374,7 @@ config VIDEO_OV2740
>  config VIDEO_OV4689
>  	tristate "OmniVision OV4689 sensor support"
>  	depends on GPIOLIB
> +	select V4L2_CCI_I2C
>  	help
>  	  This is a Video4Linux2 sensor-level driver for the OmniVision
>  	  OV4689 camera.
> diff --git a/drivers/media/i2c/ov4689.c b/drivers/media/i2c/ov4689.c
> index 53dcfc8685d4..51a15810cb1d 100644
> --- a/drivers/media/i2c/ov4689.c
> +++ b/drivers/media/i2c/ov4689.c
> @@ -15,45 +15,39 @@
>  #include <linux/regulator/consumer.h>
>  #include <media/media-entity.h>
>  #include <media/v4l2-async.h>
> +#include <media/v4l2-cci.h>
>  #include <media/v4l2-ctrls.h>
>  #include <media/v4l2-subdev.h>
>  #include <media/v4l2-fwnode.h>
>  
> +#define OV4689_REG_CHIP_ID		CCI_REG16(0x300a)
>  #define CHIP_ID				0x004688
> -#define OV4689_REG_CHIP_ID		0x300a
>  
> -#define OV4689_XVCLK_FREQ		24000000
> -
> -#define OV4689_REG_CTRL_MODE		0x0100
> +#define OV4689_REG_CTRL_MODE		CCI_REG8(0x0100)
>  #define OV4689_MODE_SW_STANDBY		0x0
>  #define OV4689_MODE_STREAMING		BIT(0)
>  
> -#define OV4689_REG_EXPOSURE		0x3500
> +#define OV4689_REG_EXPOSURE		CCI_REG24(0x3500)
>  #define OV4689_EXPOSURE_MIN		4
>  #define OV4689_EXPOSURE_STEP		1
>  #define OV4689_VTS_MAX			0x7fff
>  
> -#define OV4689_REG_GAIN_H		0x3508
> -#define OV4689_REG_GAIN_L		0x3509
> +#define OV4689_REG_GAIN_H		CCI_REG8(0x3508)
> +#define OV4689_REG_GAIN_L		CCI_REG8(0x3509)
>  #define OV4689_GAIN_H_MASK		0x07
>  #define OV4689_GAIN_H_SHIFT		8
>  #define OV4689_GAIN_L_MASK		0xff

You can replace all this with

#define OV4689_REG_GAIN			CCI_REG16(0x3508)

With this addressed,

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

>  #define OV4689_GAIN_STEP		1
>  #define OV4689_GAIN_DEFAULT		0x80
>  
> -#define OV4689_REG_TEST_PATTERN		0x5040
> +#define OV4689_REG_TEST_PATTERN		CCI_REG8(0x5040)
>  #define OV4689_TEST_PATTERN_ENABLE	0x80
>  #define OV4689_TEST_PATTERN_DISABLE	0x0
>  
> -#define OV4689_REG_VTS			0x380e
> -
> -#define REG_NULL			0xFFFF
> -
> -#define OV4689_REG_VALUE_08BIT		1
> -#define OV4689_REG_VALUE_16BIT		2
> -#define OV4689_REG_VALUE_24BIT		3
> +#define OV4689_REG_VTS			CCI_REG16(0x380e)
>  
>  #define OV4689_LANES			4
> +#define OV4689_XVCLK_FREQ		24000000
>  
>  static const char *const ov4689_supply_names[] = {
>  	"avdd", /* Analog power */
> @@ -61,11 +55,6 @@ static const char *const ov4689_supply_names[] = {
>  	"dvdd", /* Digital core power */
>  };
>  
> -struct regval {
> -	u16 addr;
> -	u8 val;
> -};
> -
>  enum ov4689_mode_id {
>  	OV4689_MODE_2688_1520 = 0,
>  	OV4689_NUM_MODES,
> @@ -84,11 +73,13 @@ struct ov4689_mode {
>  	u32 sensor_height;
>  	u32 crop_top;
>  	u32 crop_left;
> -	const struct regval *reg_list;
> +	const struct cci_reg_sequence *reg_list;
> +	unsigned int num_regs;
>  };
>  
>  struct ov4689 {
>  	struct i2c_client *client;
> +	struct regmap *regmap;
>  	struct clk *xvclk;
>  	struct gpio_desc *reset_gpio;
>  	struct gpio_desc *pwdn_gpio;
> @@ -122,125 +113,124 @@ struct ov4689_gain_range {
>   * max_framerate 30fps
>   * mipi_datarate per lane 1008Mbps
>   */
> -static const struct regval ov4689_2688x1520_regs[] = {
> +static const struct cci_reg_sequence ov4689_2688x1520_regs[] = {
>  	/* System control*/
> -	{0x0103, 0x01}, /* SC_CTRL0103 software_reset = 1 */
> -	{0x3000, 0x20}, /* SC_CMMN_PAD_OEN0 FSIN_output_enable = 1 */
> -	{0x3021, 0x03}, /*
> -			 * SC_CMMN_MISC_CTRL fst_stby_ctr = 0,
> -			 * sleep_no_latch_enable = 0
> -			 */
> +	{CCI_REG8(0x0103), 0x01}, /* SC_CTRL0103 software_reset = 1 */
> +	{CCI_REG8(0x3000), 0x20}, /* SC_CMMN_PAD_OEN0 FSIN_output_enable = 1 */
> +	{CCI_REG8(0x3021), 0x03}, /*
> +				   * SC_CMMN_MISC_CTRL fst_stby_ctr = 0,
> +				   * sleep_no_latch_enable = 0
> +				   */
>  
>  	/* AEC PK */
> -	{0x3503, 0x04}, /* AEC_MANUAL gain_input_as_sensor_gain_format = 1 */
> -	{0x352a, 0x08}, /* DIG_GAIN_FRAC_LONG dig_gain_long[14:8] = 0x08 (2x) */
> +	{CCI_REG8(0x3503), 0x04}, /* AEC_MANUAL gain_input_as_sensor_gain_format = 1 */
> +	{CCI_REG8(0x352a), 0x08}, /* DIG_GAIN_FRAC_LONG dig_gain_long[14:8] = 0x08 (2x) */
>  
>  	/* ADC and analog control*/
> -	{0x3603, 0x40},
> -	{0x3604, 0x02},
> -	{0x3609, 0x12},
> -	{0x360c, 0x08},
> -	{0x360f, 0xe5},
> -	{0x3608, 0x8f},
> -	{0x3611, 0x00},
> -	{0x3613, 0xf7},
> -	{0x3616, 0x58},
> -	{0x3619, 0x99},
> -	{0x361b, 0x60},
> -	{0x361e, 0x79},
> -	{0x3634, 0x10},
> -	{0x3635, 0x10},
> -	{0x3636, 0x15},
> -	{0x3646, 0x86},
> -	{0x364a, 0x0b},
> +	{CCI_REG8(0x3603), 0x40},
> +	{CCI_REG8(0x3604), 0x02},
> +	{CCI_REG8(0x3609), 0x12},
> +	{CCI_REG8(0x360c), 0x08},
> +	{CCI_REG8(0x360f), 0xe5},
> +	{CCI_REG8(0x3608), 0x8f},
> +	{CCI_REG8(0x3611), 0x00},
> +	{CCI_REG8(0x3613), 0xf7},
> +	{CCI_REG8(0x3616), 0x58},
> +	{CCI_REG8(0x3619), 0x99},
> +	{CCI_REG8(0x361b), 0x60},
> +	{CCI_REG8(0x361e), 0x79},
> +	{CCI_REG8(0x3634), 0x10},
> +	{CCI_REG8(0x3635), 0x10},
> +	{CCI_REG8(0x3636), 0x15},
> +	{CCI_REG8(0x3646), 0x86},
> +	{CCI_REG8(0x364a), 0x0b},
>  
>  	/* Sensor control */
> -	{0x3700, 0x17},
> -	{0x3701, 0x22},
> -	{0x3703, 0x10},
> -	{0x370a, 0x37},
> -	{0x3706, 0x63},
> -	{0x3709, 0x3c},
> -	{0x370c, 0x30},
> -	{0x3710, 0x24},
> -	{0x3720, 0x28},
> -	{0x3729, 0x7b},
> -	{0x372b, 0xbd},
> -	{0x372c, 0xbc},
> -	{0x372e, 0x52},
> -	{0x373c, 0x0e},
> -	{0x373e, 0x33},
> -	{0x3743, 0x10},
> -	{0x3744, 0x88},
> -	{0x3745, 0xc0},
> -	{0x374c, 0x00},
> -	{0x374e, 0x23},
> -	{0x3751, 0x7b},
> -	{0x3753, 0xbd},
> -	{0x3754, 0xbc},
> -	{0x3756, 0x52},
> -	{0x376b, 0x20},
> -	{0x3774, 0x51},
> -	{0x3776, 0xbd},
> -	{0x3777, 0xbd},
> -	{0x3781, 0x18},
> -	{0x3783, 0x25},
> -	{0x3798, 0x1b},
> +	{CCI_REG8(0x3700), 0x17},
> +	{CCI_REG8(0x3701), 0x22},
> +	{CCI_REG8(0x3703), 0x10},
> +	{CCI_REG8(0x370a), 0x37},
> +	{CCI_REG8(0x3706), 0x63},
> +	{CCI_REG8(0x3709), 0x3c},
> +	{CCI_REG8(0x370c), 0x30},
> +	{CCI_REG8(0x3710), 0x24},
> +	{CCI_REG8(0x3720), 0x28},
> +	{CCI_REG8(0x3729), 0x7b},
> +	{CCI_REG8(0x372b), 0xbd},
> +	{CCI_REG8(0x372c), 0xbc},
> +	{CCI_REG8(0x372e), 0x52},
> +	{CCI_REG8(0x373c), 0x0e},
> +	{CCI_REG8(0x373e), 0x33},
> +	{CCI_REG8(0x3743), 0x10},
> +	{CCI_REG8(0x3744), 0x88},
> +	{CCI_REG8(0x3745), 0xc0},
> +	{CCI_REG8(0x374c), 0x00},
> +	{CCI_REG8(0x374e), 0x23},
> +	{CCI_REG8(0x3751), 0x7b},
> +	{CCI_REG8(0x3753), 0xbd},
> +	{CCI_REG8(0x3754), 0xbc},
> +	{CCI_REG8(0x3756), 0x52},
> +	{CCI_REG8(0x376b), 0x20},
> +	{CCI_REG8(0x3774), 0x51},
> +	{CCI_REG8(0x3776), 0xbd},
> +	{CCI_REG8(0x3777), 0xbd},
> +	{CCI_REG8(0x3781), 0x18},
> +	{CCI_REG8(0x3783), 0x25},
> +	{CCI_REG8(0x3798), 0x1b},
>  
>  	/* Timing control */
> -	{0x3801, 0x08}, /* H_CROP_START_L h_crop_start[7:0] = 0x08 */
> -	{0x3805, 0x97}, /* H_CROP_END_L h_crop_end[7:0] = 0x97 */
> -	{0x380c, 0x0a}, /* TIMING_HTS_H hts[14:8] = 0x0a */
> -	{0x380d, 0x0e}, /* TIMING_HTS_L hts[7:0] = 0x0e */
> -	{0x3811, 0x08}, /* H_WIN_OFF_L h_win_off[7:0] = 0x08*/
> -	{0x3813, 0x04}, /* V_WIN_OFF_L v_win_off[7:0] = 0x04 */
> -	{0x3819, 0x01}, /* VSYNC_END_L vsync_end_point[7:0] = 0x01 */
> -	{0x3821, 0x06}, /* TIMING_FORMAT2 array_h_mirror = 1, digital_h_mirror = 1 */
> +	{CCI_REG8(0x3801), 0x08}, /* H_CROP_START_L h_crop_start[7:0] = 0x08 */
> +	{CCI_REG8(0x3805), 0x97}, /* H_CROP_END_L h_crop_end[7:0] = 0x97 */
> +	{CCI_REG8(0x380c), 0x0a}, /* TIMING_HTS_H hts[14:8] = 0x0a */
> +	{CCI_REG8(0x380d), 0x0e}, /* TIMING_HTS_L hts[7:0] = 0x0e */
> +	{CCI_REG8(0x3811), 0x08}, /* H_WIN_OFF_L h_win_off[7:0] = 0x08*/
> +	{CCI_REG8(0x3813), 0x04}, /* V_WIN_OFF_L v_win_off[7:0] = 0x04 */
> +	{CCI_REG8(0x3819), 0x01}, /* VSYNC_END_L vsync_end_point[7:0] = 0x01 */
> +	{CCI_REG8(0x3821), 0x06}, /* TIMING_FORMAT2 array_h_mirror = 1, digital_h_mirror = 1 */
>  
>  	/* OTP control */
> -	{0x3d85, 0x36}, /* OTP_REG85 OTP_power_up_load_setting_enable = 1,
> -			 * OTP_power_up_load_data_enable = 1,
> -			 * OTP_bist_select = 1 (compare with zero)
> -			 */
> -	{0x3d8c, 0x71}, /* OTP_SETTING_STT_ADDRESS_H */
> -	{0x3d8d, 0xcb}, /* OTP_SETTING_STT_ADDRESS_L */
> +	{CCI_REG8(0x3d85), 0x36}, /* OTP_REG85 OTP_power_up_load_setting_enable = 1,
> +				   * OTP_power_up_load_data_enable = 1,
> +				   * OTP_bist_select = 1 (compare with zero)
> +				   */
> +	{CCI_REG8(0x3d8c), 0x71}, /* OTP_SETTING_STT_ADDRESS_H */
> +	{CCI_REG8(0x3d8d), 0xcb}, /* OTP_SETTING_STT_ADDRESS_L */
>  
>  	/* BLC registers*/
> -	{0x4001, 0x40}, /* DEBUG_MODE */
> -	{0x401b, 0x00}, /* DEBUG_MODE */
> -	{0x401d, 0x00}, /* DEBUG_MODE */
> -	{0x401f, 0x00}, /* DEBUG_MODE */
> -	{0x4020, 0x00}, /* ANCHOR_LEFT_START_H anchor_left_start[11:8] = 0 */
> -	{0x4021, 0x10}, /* ANCHOR_LEFT_START_L anchor_left_start[7:0] = 0x10 */
> -	{0x4022, 0x07}, /* ANCHOR_LEFT_END_H anchor_left_end[11:8] = 0x07 */
> -	{0x4023, 0xcf}, /* ANCHOR_LEFT_END_L anchor_left_end[7:0] = 0xcf */
> -	{0x4024, 0x09}, /* ANCHOR_RIGHT_START_H anchor_right_start[11:8] = 0x09 */
> -	{0x4025, 0x60}, /* ANCHOR_RIGHT_START_L anchor_right_start[7:0] = 0x60 */
> -	{0x4026, 0x09}, /* ANCHOR_RIGHT_END_H anchor_right_end[11:8] = 0x09 */
> -	{0x4027, 0x6f}, /* ANCHOR_RIGHT_END_L anchor_right_end[7:0] = 0x6f */
> +	{CCI_REG8(0x4001), 0x40}, /* DEBUG_MODE */
> +	{CCI_REG8(0x401b), 0x00}, /* DEBUG_MODE */
> +	{CCI_REG8(0x401d), 0x00}, /* DEBUG_MODE */
> +	{CCI_REG8(0x401f), 0x00}, /* DEBUG_MODE */
> +	{CCI_REG8(0x4020), 0x00}, /* ANCHOR_LEFT_START_H anchor_left_start[11:8] = 0 */
> +	{CCI_REG8(0x4021), 0x10}, /* ANCHOR_LEFT_START_L anchor_left_start[7:0] = 0x10 */
> +	{CCI_REG8(0x4022), 0x07}, /* ANCHOR_LEFT_END_H anchor_left_end[11:8] = 0x07 */
> +	{CCI_REG8(0x4023), 0xcf}, /* ANCHOR_LEFT_END_L anchor_left_end[7:0] = 0xcf */
> +	{CCI_REG8(0x4024), 0x09}, /* ANCHOR_RIGHT_START_H anchor_right_start[11:8] = 0x09 */
> +	{CCI_REG8(0x4025), 0x60}, /* ANCHOR_RIGHT_START_L anchor_right_start[7:0] = 0x60 */
> +	{CCI_REG8(0x4026), 0x09}, /* ANCHOR_RIGHT_END_H anchor_right_end[11:8] = 0x09 */
> +	{CCI_REG8(0x4027), 0x6f}, /* ANCHOR_RIGHT_END_L anchor_right_end[7:0] = 0x6f */
>  
>  	/* ADC sync control */
> -	{0x4500, 0x6c}, /* ADC_SYNC_CTRL */
> -	{0x4503, 0x01}, /* ADC_SYNC_CTRL */
> +	{CCI_REG8(0x4500), 0x6c}, /* ADC_SYNC_CTRL */
> +	{CCI_REG8(0x4503), 0x01}, /* ADC_SYNC_CTRL */
>  
>  	/* VFIFO */
> -	{0x4601, 0xa7}, /* VFIFO_CTRL_01 r_vfifo_read_start[7:0] = 0xa7 */
> +	{CCI_REG8(0x4601), 0xa7}, /* VFIFO_CTRL_01 r_vfifo_read_start[7:0] = 0xa7 */
>  
>  	/* Temperature monitor */
> -	{0x4d00, 0x04}, /* TPM_CTRL_00 tmp_slope[15:8] = 0x04 */
> -	{0x4d01, 0x42}, /* TPM_CTRL_01 tmp_slope[7:0] = 0x42 */
> -	{0x4d02, 0xd1}, /* TPM_CTRL_02 tpm_offset[31:24] = 0xd1 */
> -	{0x4d03, 0x93}, /* TPM_CTRL_03 tpm_offset[23:16] = 0x93 */
> -	{0x4d04, 0xf5}, /* TPM_CTRL_04 tpm_offset[15:8]  = 0xf5 */
> -	{0x4d05, 0xc1}, /* TPM_CTRL_05 tpm_offset[7:0]   = 0xc1 */
> +	{CCI_REG8(0x4d00), 0x04}, /* TPM_CTRL_00 tmp_slope[15:8] = 0x04 */
> +	{CCI_REG8(0x4d01), 0x42}, /* TPM_CTRL_01 tmp_slope[7:0] = 0x42 */
> +	{CCI_REG8(0x4d02), 0xd1}, /* TPM_CTRL_02 tpm_offset[31:24] = 0xd1 */
> +	{CCI_REG8(0x4d03), 0x93}, /* TPM_CTRL_03 tpm_offset[23:16] = 0x93 */
> +	{CCI_REG8(0x4d04), 0xf5}, /* TPM_CTRL_04 tpm_offset[15:8]  = 0xf5 */
> +	{CCI_REG8(0x4d05), 0xc1}, /* TPM_CTRL_05 tpm_offset[7:0]   = 0xc1 */
>  
>  	/* pre-ISP control */
> -	{0x5050, 0x0c}, /* DEBUG_MODE */
> +	{CCI_REG8(0x5050), 0x0c}, /* DEBUG_MODE */
>  
>  	/* OTP-DPC control */
> -	{0x5501, 0x10}, /* OTP_DPC_START_L otp_start_address[7:0] = 0x10 */
> -	{0x5503, 0x0f}, /* OTP_DPC_END_L otp_end_address[7:0] = 0x0f */
> -	{REG_NULL, 0x00},
> +	{CCI_REG8(0x5501), 0x10}, /* OTP_DPC_START_L otp_start_address[7:0] = 0x10 */
> +	{CCI_REG8(0x5503), 0x0f}, /* OTP_DPC_END_L otp_end_address[7:0] = 0x0f */
>  };
>  
>  static const struct ov4689_mode supported_modes[] = {
> @@ -258,6 +248,7 @@ static const struct ov4689_mode supported_modes[] = {
>  		.vts_def = 1554,
>  		.pixel_rate = 480000000,
>  		.reg_list = ov4689_2688x1520_regs,
> +		.num_regs = ARRAY_SIZE(ov4689_2688x1520_regs),
>  	},
>  };
>  
> @@ -310,83 +301,6 @@ static const struct ov4689_gain_range ov4689_gain_ranges[] = {
>  	},
>  };
>  
> -/* Write registers up to 4 at a time */
> -static int ov4689_write_reg(struct i2c_client *client, u16 reg, u32 len,
> -			    u32 val)
> -{
> -	u32 buf_i, val_i;
> -	__be32 val_be;
> -	u8 *val_p;
> -	u8 buf[6];
> -
> -	if (len > 4)
> -		return -EINVAL;
> -
> -	buf[0] = reg >> 8;
> -	buf[1] = reg & 0xff;
> -
> -	val_be = cpu_to_be32(val);
> -	val_p = (u8 *)&val_be;
> -	buf_i = 2;
> -	val_i = 4 - len;
> -
> -	while (val_i < 4)
> -		buf[buf_i++] = val_p[val_i++];
> -
> -	if (i2c_master_send(client, buf, len + 2) != len + 2)
> -		return -EIO;
> -
> -	return 0;
> -}
> -
> -static int ov4689_write_array(struct i2c_client *client,
> -			      const struct regval *regs)
> -{
> -	int ret = 0;
> -	u32 i;
> -
> -	for (i = 0; ret == 0 && regs[i].addr != REG_NULL; i++)
> -		ret = ov4689_write_reg(client, regs[i].addr,
> -				       OV4689_REG_VALUE_08BIT, regs[i].val);
> -
> -	return ret;
> -}
> -
> -/* Read registers up to 4 at a time */
> -static int ov4689_read_reg(struct i2c_client *client, u16 reg, unsigned int len,
> -			   u32 *val)
> -{
> -	__be16 reg_addr_be = cpu_to_be16(reg);
> -	struct i2c_msg msgs[2];
> -	__be32 data_be = 0;
> -	u8 *data_be_p;
> -	int ret;
> -
> -	if (len > 4 || !len)
> -		return -EINVAL;
> -
> -	data_be_p = (u8 *)&data_be;
> -	/* Write register address */
> -	msgs[0].addr = client->addr;
> -	msgs[0].flags = 0;
> -	msgs[0].len = 2;
> -	msgs[0].buf = (u8 *)&reg_addr_be;
> -
> -	/* Read data from register */
> -	msgs[1].addr = client->addr;
> -	msgs[1].flags = I2C_M_RD;
> -	msgs[1].len = len;
> -	msgs[1].buf = &data_be_p[4 - len];
> -
> -	ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
> -	if (ret != ARRAY_SIZE(msgs))
> -		return -EIO;
> -
> -	*val = be32_to_cpu(data_be);
> -
> -	return 0;
> -}
> -
>  static void ov4689_fill_fmt(const struct ov4689_mode *mode,
>  			    struct v4l2_mbus_framefmt *fmt)
>  {
> @@ -460,8 +374,8 @@ static int ov4689_enable_test_pattern(struct ov4689 *ov4689, u32 pattern)
>  	else
>  		val = OV4689_TEST_PATTERN_DISABLE;
>  
> -	return ov4689_write_reg(ov4689->client, OV4689_REG_TEST_PATTERN,
> -				OV4689_REG_VALUE_08BIT, val);
> +	return cci_write(ov4689->regmap, OV4689_REG_TEST_PATTERN,
> +			 val, NULL);
>  }
>  
>  static int ov4689_get_selection(struct v4l2_subdev *sd,
> @@ -505,8 +419,10 @@ static int ov4689_s_stream(struct v4l2_subdev *sd, int on)
>  		if (ret < 0)
>  			goto unlock_and_return;
>  
> -		ret = ov4689_write_array(ov4689->client,
> -					 ov4689->cur_mode->reg_list);
> +		ret = cci_multi_reg_write(ov4689->regmap,
> +					  ov4689->cur_mode->reg_list,
> +					  ov4689->cur_mode->num_regs,
> +					  NULL);
>  		if (ret) {
>  			pm_runtime_put(&client->dev);
>  			goto unlock_and_return;
> @@ -518,17 +434,15 @@ static int ov4689_s_stream(struct v4l2_subdev *sd, int on)
>  			goto unlock_and_return;
>  		}
>  
> -		ret = ov4689_write_reg(ov4689->client, OV4689_REG_CTRL_MODE,
> -				       OV4689_REG_VALUE_08BIT,
> -				       OV4689_MODE_STREAMING);
> +		ret = cci_write(ov4689->regmap, OV4689_REG_CTRL_MODE,
> +				OV4689_MODE_STREAMING, NULL);
>  		if (ret) {
>  			pm_runtime_put(&client->dev);
>  			goto unlock_and_return;
>  		}
>  	} else {
> -		ov4689_write_reg(ov4689->client, OV4689_REG_CTRL_MODE,
> -				 OV4689_REG_VALUE_08BIT,
> -				 OV4689_MODE_SW_STANDBY);
> +		cci_write(ov4689->regmap, OV4689_REG_CTRL_MODE,
> +			  OV4689_MODE_SW_STANDBY, NULL);
>  		pm_runtime_put(&client->dev);
>  	}
>  
> @@ -693,26 +607,23 @@ static int ov4689_set_ctrl(struct v4l2_ctrl *ctrl)
>  	switch (ctrl->id) {
>  	case V4L2_CID_EXPOSURE:
>  		/* 4 least significant bits of exposure are fractional part */
> -		ret = ov4689_write_reg(ov4689->client, OV4689_REG_EXPOSURE,
> -				       OV4689_REG_VALUE_24BIT, ctrl->val << 4);
> +		ret = cci_write(ov4689->regmap, OV4689_REG_EXPOSURE,
> +				ctrl->val << 4, NULL);
>  		break;
>  	case V4L2_CID_ANALOGUE_GAIN:
>  		ret = ov4689_map_gain(ov4689, ctrl->val, &sensor_gain);
>  
> -		ret = ret ?:
> -			ov4689_write_reg(ov4689->client, OV4689_REG_GAIN_H,
> -					 OV4689_REG_VALUE_08BIT,
> -					 (sensor_gain >> OV4689_GAIN_H_SHIFT) &
> -					 OV4689_GAIN_H_MASK);
> -		ret = ret ?:
> -			ov4689_write_reg(ov4689->client, OV4689_REG_GAIN_L,
> -					 OV4689_REG_VALUE_08BIT,
> -					 sensor_gain & OV4689_GAIN_L_MASK);
> +		cci_write(ov4689->regmap, OV4689_REG_GAIN_H,
> +			  (sensor_gain >> OV4689_GAIN_H_SHIFT) &
> +			  OV4689_GAIN_H_MASK, &ret);
> +
> +		cci_write(ov4689->regmap, OV4689_REG_GAIN_L,
> +			  sensor_gain & OV4689_GAIN_L_MASK,
> +			  &ret);
>  		break;
>  	case V4L2_CID_VBLANK:
> -		ret = ov4689_write_reg(ov4689->client, OV4689_REG_VTS,
> -				       OV4689_REG_VALUE_16BIT,
> -				       ctrl->val + ov4689->cur_mode->height);
> +		ret = cci_write(ov4689->regmap, OV4689_REG_VTS,
> +				ctrl->val + ov4689->cur_mode->height, NULL);
>  		break;
>  	case V4L2_CID_TEST_PATTERN:
>  		ret = ov4689_enable_test_pattern(ov4689, ctrl->val);
> @@ -817,18 +728,17 @@ static int ov4689_check_sensor_id(struct ov4689 *ov4689,
>  				  struct i2c_client *client)
>  {
>  	struct device *dev = &ov4689->client->dev;
> -	u32 id = 0;
> +	u64 id = 0;
>  	int ret;
>  
> -	ret = ov4689_read_reg(client, OV4689_REG_CHIP_ID,
> -			      OV4689_REG_VALUE_16BIT, &id);
> +	ret = cci_read(ov4689->regmap, OV4689_REG_CHIP_ID, &id, NULL);
>  	if (ret) {
>  		dev_err(dev, "Cannot read sensor ID\n");
>  		return ret;
>  	}
>  
>  	if (id != CHIP_ID) {
> -		dev_err(dev, "Unexpected sensor ID %06x, expected %06x\n",
> +		dev_err(dev, "Unexpected sensor ID %06llx, expected %06x\n",
>  			id, CHIP_ID);
>  		return -ENODEV;
>  	}
> @@ -938,6 +848,13 @@ static int ov4689_probe(struct i2c_client *client)
>  		return -EINVAL;
>  	}
>  
> +	ov4689->regmap = devm_cci_regmap_init_i2c(client, 16);
> +	if (IS_ERR(ov4689->regmap)) {
> +		ret = PTR_ERR(ov4689->regmap);
> +		dev_err(dev, "failed to initialize CCI: %d\n", ret);
> +		return ret;
> +	}
> +
>  	ov4689->reset_gpio = devm_gpiod_get_optional(dev, "reset",
>  						     GPIOD_OUT_LOW);
>  	if (IS_ERR(ov4689->reset_gpio)) {

-- 
Regards,

Laurent Pinchart