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Date: Tue, 9 Jan 2024 10:18:25 +0000
From: Sakari Ailus <sakari.ailus@linux.intel.com>
To: Zhi Mao <zhi.mao@mediatek.com>
Cc: mchehab@kernel.org, robh+dt@kernel.org,
	krzysztof.kozlowski+dt@linaro.org,
	laurent.pinchart@ideasonboard.com, shengnan.wang@mediatek.com,
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Subject: Re: [PATCH v3 2/2] media: i2c: Add GC08A3 image sensor driver
Message-ID: <ZZ0dcTEqxjYCohac@kekkonen.localdomain>
References: <20240109022715.30278-1-zhi.mao@mediatek.com>
 <20240109022715.30278-3-zhi.mao@mediatek.com>
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In-Reply-To: <20240109022715.30278-3-zhi.mao@mediatek.com>

Hi Zhi,

Thanks for the update.

On Tue, Jan 09, 2024 at 10:27:15AM +0800, Zhi Mao wrote:
> Add a V4L2 sub-device driver for Galaxycore GC08A3 image sensor.
> 
> Signed-off-by: Zhi Mao <zhi.mao@mediatek.com>
> ---
>  drivers/media/i2c/Kconfig  |   10 +
>  drivers/media/i2c/Makefile |    1 +
>  drivers/media/i2c/gc08a3.c | 1467 ++++++++++++++++++++++++++++++++++++
>  3 files changed, 1478 insertions(+)
>  create mode 100644 drivers/media/i2c/gc08a3.c
> 
> diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
> index 78a87331686e..2e5bd751534b 100644
> --- a/drivers/media/i2c/Kconfig
> +++ b/drivers/media/i2c/Kconfig
> @@ -70,6 +70,16 @@ config VIDEO_GC0308
>  	  To compile this driver as a module, choose M here: the
>  	  module will be called gc0308.
>  
> +config VIDEO_GC08A3
> +	tristate "GalaxyCore gc08a3 sensor support"
> +	select V4L2_CCI_I2C
> +	help
> +	  This is a Video4Linux2 sensor driver for the GalaxyCore gc08a3
> +	  camera.
> +
> +	  To compile this driver as a module, choose M here: the
> +	  module will be called gc08a3.
> +
>  config VIDEO_GC2145
>  	select V4L2_CCI_I2C
>  	tristate "GalaxyCore GC2145 sensor support"
> diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
> index dfbe6448b549..b82e99ca7578 100644
> --- a/drivers/media/i2c/Makefile
> +++ b/drivers/media/i2c/Makefile
> @@ -38,6 +38,7 @@ obj-$(CONFIG_VIDEO_DW9768) += dw9768.o
>  obj-$(CONFIG_VIDEO_DW9807_VCM) += dw9807-vcm.o
>  obj-$(CONFIG_VIDEO_ET8EK8) += et8ek8/
>  obj-$(CONFIG_VIDEO_GC0308) += gc0308.o
> +obj-$(CONFIG_VIDEO_GC08A3) += gc08a3.o
>  obj-$(CONFIG_VIDEO_GC2145) += gc2145.o
>  obj-$(CONFIG_VIDEO_HI556) += hi556.o
>  obj-$(CONFIG_VIDEO_HI846) += hi846.o
> diff --git a/drivers/media/i2c/gc08a3.c b/drivers/media/i2c/gc08a3.c
> new file mode 100644
> index 000000000000..eea304f0f84d
> --- /dev/null
> +++ b/drivers/media/i2c/gc08a3.c
> @@ -0,0 +1,1467 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * gc08a3.c - gc08a3 sensor driver
> + *
> + * Copyright 2023 MediaTek
> + *
> + * Zhi Mao <zhi.mao@mediatek.com>
> + */
> +
> +#include <asm/unaligned.h>
> +#include <linux/clk.h>
> +#include <linux/delay.h>
> +#include <linux/gpio/consumer.h>
> +#include <linux/i2c.h>
> +#include <linux/module.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/regulator/consumer.h>
> +#include <media/media-entity.h>
> +#include <media/v4l2-ctrls.h>
> +#include <media/v4l2-fwnode.h>
> +#include <media/v4l2-subdev.h>
> +#include <media/v4l2-cci.h>
> +#include <media/v4l2-event.h>
> +
> +#define GC08A3_REG_CHIP_ID CCI_REG16(0x03f0)
> +#define GC08A3_CHIP_ID 0x08a3
> +
> +#define GC08A3_NATIVE_WIDTH 3264
> +#define GC08A3_NATIVE_HEIGHT 2448
> +
> +#define GC08A3_REG_TEST_PATTERN_EN CCI_REG8(0x008c)
> +#define GC08A3_REG_TEST_PATTERN_IDX CCI_REG8(0x008d)
> +#define GC08A3_TEST_PATTERN_EN 0x01
> +
> +#define GC08A3_STRAEMING_REG CCI_REG8(0x0100)
> +
> +#define GC08A3_DEFAULT_CLK_FREQ 24000000
> +#define GC08A3_MBUS_CODE MEDIA_BUS_FMT_SRGGB10_1X10
> +#define GC08A3_DATA_LANES 4
> +
> +/* for 1920*1080 */
> +#define GC08A3_LINK_FREQ_207MHZ 207000000ULL
> +/* for 3264*2448 */
> +#define GC08A3_LINK_FREQ_336MHZ 336000000ULL
> +
> +#define GC08A3_RGB_DEPTH 10
> +
> +#define GC08A3_FRAME_LENGTH_REG CCI_REG16(0x0340)
> +#define GC08A3_VTS_30FPS 2548
> +#define GC08A3_VTS_30FPS_MIN 2548
> +#define GC08A3_VTS_60FPS 1276
> +#define GC08A3_VTS_60FPS_MIN 1276
> +#define GC08A3_VTS_MAX 0xfff0
> +
> +#define GC08A3_HTS_30FPS 3640
> +#define GC08A3_HTS_60FPS 3640
> +
> +#define GC08A3_EXP_REG CCI_REG16(0x0202)
> +#define GC08A3_EXP_MARGIN 16
> +#define GC08A3_EXP_MIN 4
> +#define GC08A3_EXP_STEP 1
> +
> +#define GC08A3_FLIP_REG CCI_REG8(0x0101)
> +#define GC08A3_FLIP_H_MASK 0x1
> +#define GC08A3_FLIP_V_MASK 0x2
> +
> +#define GC08A3_AGAIN_REG CCI_REG16(0x0204)
> +#define GC08A3_AGAIN_MIN 1024
> +#define GC08A3_AGAIN_MAX (1024 * 16)
> +#define GC08A3_AGAIN_STEP 1
> +
> +#define GC08A3_MIN_SLEEP_US  2000
> +#define GC08A3_MAX_SLEEP_US  3000
> +
> +static const char *const gc08a3_test_pattern_menu[] = {
> +	"No Pattern", "Solid Black", "Colour Bar", "Solid White",
> +	"Solid Red", "Solid Green", "Solid Blue", "Solid Yellow",
> +};
> +
> +enum {
> +	GC08A3_LINK_FREQ_336MHZ_INDEX,
> +	GC08A3_LINK_FREQ_207MHZ_INDEX,
> +};
> +
> +static const s64 link_freq_menu_items[] = {
> +	GC08A3_LINK_FREQ_336MHZ,
> +	GC08A3_LINK_FREQ_207MHZ,
> +};
> +
> +static const char *const gc08a3_supply_name[] = {
> +	"avdd",
> +	"dvdd",
> +	"dovdd",
> +};
> +
> +#define GC08A3_NUM_SUPPLIES ARRAY_SIZE(gc08a3_supply_name)

Please don't add such macros, use ARRAY_SIZE(...) directly.

> +
> +struct gc08a3 {
> +	struct device *dev;
> +	struct v4l2_subdev sd;
> +	struct media_pad pad;
> +	struct i2c_client *client;
> +
> +	struct clk *xclk;
> +	struct regulator_bulk_data supplies[GC08A3_NUM_SUPPLIES];
> +	struct gpio_desc *reset_gpio;
> +
> +	struct v4l2_ctrl_handler ctrls;
> +	struct v4l2_ctrl *pixel_rate;
> +	struct v4l2_ctrl *link_freq;
> +	struct v4l2_ctrl *exposure;
> +	struct v4l2_ctrl *vblank;
> +	struct v4l2_ctrl *hblank;
> +
> +	struct regmap *regmap;
> +
> +	bool streaming;
> +
> +	/* Current mode */
> +	const struct gc08a3_mode *cur_mode;
> +};
> +
> +struct gc08a3_reg_list {
> +	u32 num_of_regs;
> +	const struct cci_reg_sequence *regs;
> +};
> +
> +struct gc08a3_link_freq_config {
> +	const struct gc08a3_reg_list reg_list;
> +};
> +
> +static const struct cci_reg_sequence mode_3264x2448[] = {
> +	/* system */
> +	{ CCI_REG8(0x0336), 0x70 },
> +	{ CCI_REG8(0x0383), 0xbb },
> +	{ CCI_REG8(0x0344), 0x00 },
> +	{ CCI_REG8(0x0345), 0x06 },
> +	{ CCI_REG8(0x0346), 0x00 },
> +	{ CCI_REG8(0x0347), 0x04 },
> +	{ CCI_REG8(0x0348), 0x0c },
> +	{ CCI_REG8(0x0349), 0xd0 },
> +	{ CCI_REG8(0x034a), 0x09 },
> +	{ CCI_REG8(0x034b), 0x9c },
> +	{ CCI_REG8(0x0202), 0x09 },
> +	{ CCI_REG8(0x0203), 0x04 },
> +	{ CCI_REG8(0x0340), 0x09 },
> +	{ CCI_REG8(0x0341), 0xf4 },
> +	{ CCI_REG8(0x0342), 0x07 },
> +	{ CCI_REG8(0x0343), 0x1c },
> +
> +	{ CCI_REG8(0x0226), 0x00 },
> +	{ CCI_REG8(0x0227), 0x28 },
> +	{ CCI_REG8(0x0e38), 0x49 },
> +	{ CCI_REG8(0x0210), 0x13 },
> +	{ CCI_REG8(0x0218), 0x00 },
> +	{ CCI_REG8(0x0241), 0x88 },
> +	{ CCI_REG8(0x0392), 0x60 },
> +
> +	/* ISP */
> +	{ CCI_REG8(0x00a2), 0x00 },
> +	{ CCI_REG8(0x00a3), 0x00 },
> +	{ CCI_REG8(0x00ab), 0x00 },
> +	{ CCI_REG8(0x00ac), 0x00 },
> +
> +	/* GAIN */
> +	{ CCI_REG8(0x0204), 0x04 },
> +	{ CCI_REG8(0x0205), 0x00 },
> +	{ CCI_REG8(0x0050), 0x5c },
> +	{ CCI_REG8(0x0051), 0x44 },
> +
> +	/* out window */
> +	{ CCI_REG8(0x009a), 0x66 },
> +	{ CCI_REG8(0x0351), 0x00 },
> +	{ CCI_REG8(0x0352), 0x06 },
> +	{ CCI_REG8(0x0353), 0x00 },
> +	{ CCI_REG8(0x0354), 0x08 },
> +	{ CCI_REG8(0x034c), 0x0c },
> +	{ CCI_REG8(0x034d), 0xc0 },
> +	{ CCI_REG8(0x034e), 0x09 },
> +	{ CCI_REG8(0x034f), 0x90 },
> +
> +	/* MIPI */
> +	{ CCI_REG8(0x0114), 0x03 },
> +	{ CCI_REG8(0x0180), 0x65 },
> +	{ CCI_REG8(0x0181), 0xf0 },
> +	{ CCI_REG8(0x0185), 0x01 },
> +	{ CCI_REG8(0x0115), 0x30 },
> +	{ CCI_REG8(0x011b), 0x12 },
> +	{ CCI_REG8(0x011c), 0x12 },
> +	{ CCI_REG8(0x0121), 0x06 },
> +	{ CCI_REG8(0x0122), 0x06 },
> +	{ CCI_REG8(0x0123), 0x15 },
> +	{ CCI_REG8(0x0124), 0x01 },
> +	{ CCI_REG8(0x0125), 0x0b },
> +	{ CCI_REG8(0x0126), 0x08 },
> +	{ CCI_REG8(0x0129), 0x06 },
> +	{ CCI_REG8(0x012a), 0x08 },
> +	{ CCI_REG8(0x012b), 0x08 },
> +
> +	{ CCI_REG8(0x0a73), 0x60 },
> +	{ CCI_REG8(0x0a70), 0x11 },
> +	{ CCI_REG8(0x0313), 0x80 },
> +	{ CCI_REG8(0x0aff), 0x00 },
> +	{ CCI_REG8(0x0aff), 0x00 },
> +	{ CCI_REG8(0x0aff), 0x00 },
> +	{ CCI_REG8(0x0aff), 0x00 },
> +	{ CCI_REG8(0x0aff), 0x00 },
> +	{ CCI_REG8(0x0aff), 0x00 },
> +	{ CCI_REG8(0x0aff), 0x00 },
> +	{ CCI_REG8(0x0aff), 0x00 },
> +	{ CCI_REG8(0x0a70), 0x00 },
> +	{ CCI_REG8(0x00a4), 0x80 },
> +	{ CCI_REG8(0x0316), 0x01 },
> +	{ CCI_REG8(0x0a67), 0x00 },
> +	{ CCI_REG8(0x0084), 0x10 },
> +	{ CCI_REG8(0x0102), 0x09 },
> +};
> +
> +static const struct cci_reg_sequence mode_1920x1080[] = {
> +	/* system */
> +	{ CCI_REG8(0x0336), 0x45 },
> +	{ CCI_REG8(0x0383), 0x8b },
> +	{ CCI_REG8(0x0344), 0x02 },
> +	{ CCI_REG8(0x0345), 0xa6 },
> +	{ CCI_REG8(0x0346), 0x02 },
> +	{ CCI_REG8(0x0347), 0xb0 },
> +	{ CCI_REG8(0x0348), 0x07 },
> +	{ CCI_REG8(0x0349), 0x90 },
> +	{ CCI_REG8(0x034a), 0x04 },
> +	{ CCI_REG8(0x034b), 0x44 },
> +	{ CCI_REG8(0x0202), 0x03 },
> +	{ CCI_REG8(0x0203), 0x00 },
> +	{ CCI_REG8(0x0340), 0x04 },
> +	{ CCI_REG8(0x0341), 0xfc },
> +	{ CCI_REG8(0x0342), 0x07 },
> +	{ CCI_REG8(0x0343), 0x1c },
> +	{ CCI_REG8(0x0226), 0x00 },
> +	{ CCI_REG8(0x0227), 0x88 },
> +	{ CCI_REG8(0x0e38), 0x49 },
> +	{ CCI_REG8(0x0210), 0x13 },
> +	{ CCI_REG8(0x0218), 0x00 },
> +	{ CCI_REG8(0x0241), 0x88 },
> +	{ CCI_REG8(0x0392), 0x60 },
> +
> +	/* ISP */
> +	{ CCI_REG8(0x00a2), 0xac },
> +	{ CCI_REG8(0x00a3), 0x02 },
> +	{ CCI_REG8(0x00ab), 0xa0 },
> +	{ CCI_REG8(0x00ac), 0x02 },
> +
> +	/* GAIN */
> +	{ CCI_REG8(0x0204), 0x04 },
> +	{ CCI_REG8(0x0205), 0x00 },
> +	{ CCI_REG8(0x0050), 0x38 },
> +	{ CCI_REG8(0x0051), 0x20 },
> +
> +	/* out window */
> +	{ CCI_REG8(0x009a), 0x66 },
> +	{ CCI_REG8(0x0351), 0x00 },
> +	{ CCI_REG8(0x0352), 0x06 },
> +	{ CCI_REG8(0x0353), 0x00 },
> +	{ CCI_REG8(0x0354), 0x08 },
> +	{ CCI_REG8(0x034c), 0x07 },
> +	{ CCI_REG8(0x034d), 0x80 },
> +	{ CCI_REG8(0x034e), 0x04 },
> +	{ CCI_REG8(0x034f), 0x38 },
> +
> +	/* MIPI */
> +	{ CCI_REG8(0x0114), 0x03 },
> +	{ CCI_REG8(0x0180), 0x65 },
> +	{ CCI_REG8(0x0181), 0xf0 },
> +	{ CCI_REG8(0x0185), 0x01 },
> +	{ CCI_REG8(0x0115), 0x30 },
> +	{ CCI_REG8(0x011b), 0x12 },
> +	{ CCI_REG8(0x011c), 0x12 },
> +	{ CCI_REG8(0x0121), 0x02 },
> +	{ CCI_REG8(0x0122), 0x03 },
> +	{ CCI_REG8(0x0123), 0x0c },
> +	{ CCI_REG8(0x0124), 0x00 },
> +	{ CCI_REG8(0x0125), 0x09 },
> +	{ CCI_REG8(0x0126), 0x06 },
> +	{ CCI_REG8(0x0129), 0x04 },
> +	{ CCI_REG8(0x012a), 0x03 },
> +	{ CCI_REG8(0x012b), 0x06 },
> +
> +	{ CCI_REG8(0x0a73), 0x60 },
> +	{ CCI_REG8(0x0a70), 0x11 },
> +	{ CCI_REG8(0x0313), 0x80 },
> +	{ CCI_REG8(0x0aff), 0x00 },
> +	{ CCI_REG8(0x0aff), 0x00 },
> +	{ CCI_REG8(0x0aff), 0x00 },
> +	{ CCI_REG8(0x0aff), 0x00 },
> +	{ CCI_REG8(0x0aff), 0x00 },
> +	{ CCI_REG8(0x0aff), 0x00 },
> +	{ CCI_REG8(0x0aff), 0x00 },
> +	{ CCI_REG8(0x0aff), 0x00 },
> +	{ CCI_REG8(0x0a70), 0x00 },
> +	{ CCI_REG8(0x00a4), 0x80 },
> +	{ CCI_REG8(0x0316), 0x01 },
> +	{ CCI_REG8(0x0a67), 0x00 },
> +	{ CCI_REG8(0x0084), 0x10 },
> +	{ CCI_REG8(0x0102), 0x09 },
> +};
> +
> +static const struct cci_reg_sequence mode_table_common[] = {
> +	{ GC08A3_STRAEMING_REG, 0x00 },
> +	/* system */
> +	{ CCI_REG8(0x031c), 0x60 },
> +	{ CCI_REG8(0x0337), 0x04 },
> +	{ CCI_REG8(0x0335), 0x51 },
> +	{ CCI_REG8(0x0336), 0x70 },
> +	{ CCI_REG8(0x0383), 0xbb },
> +	{ CCI_REG8(0x031a), 0x00 },
> +	{ CCI_REG8(0x0321), 0x10 },
> +	{ CCI_REG8(0x0327), 0x03 },
> +	{ CCI_REG8(0x0325), 0x40 },
> +	{ CCI_REG8(0x0326), 0x23 },
> +	{ CCI_REG8(0x0314), 0x11 },
> +	{ CCI_REG8(0x0315), 0xd6 },
> +	{ CCI_REG8(0x0316), 0x01 },
> +	{ CCI_REG8(0x0334), 0x40 },
> +	{ CCI_REG8(0x0324), 0x42 },
> +	{ CCI_REG8(0x031c), 0x00 },
> +	{ CCI_REG8(0x031c), 0x9f },
> +	{ CCI_REG8(0x039a), 0x13 },
> +	{ CCI_REG8(0x0084), 0x30 },
> +	{ CCI_REG8(0x02b3), 0x08 },
> +	{ CCI_REG8(0x0057), 0x0c },
> +	{ CCI_REG8(0x05c3), 0x50 },
> +	{ CCI_REG8(0x0311), 0x90 },
> +	{ CCI_REG8(0x05a0), 0x02 },
> +	{ CCI_REG8(0x0074), 0x0a },
> +	{ CCI_REG8(0x0059), 0x11 },
> +	{ CCI_REG8(0x0070), 0x05 },
> +	{ CCI_REG8(0x0101), 0x00 },
> +
> +	/* analog */
> +	{ CCI_REG8(0x0344), 0x00 },
> +	{ CCI_REG8(0x0345), 0x06 },
> +	{ CCI_REG8(0x0346), 0x00 },
> +	{ CCI_REG8(0x0347), 0x04 },
> +	{ CCI_REG8(0x0348), 0x0c },
> +	{ CCI_REG8(0x0349), 0xd0 },
> +	{ CCI_REG8(0x034a), 0x09 },
> +	{ CCI_REG8(0x034b), 0x9c },
> +	{ CCI_REG8(0x0202), 0x09 },
> +	{ CCI_REG8(0x0203), 0x04 },
> +
> +	{ CCI_REG8(0x0219), 0x05 },
> +	{ CCI_REG8(0x0226), 0x00 },
> +	{ CCI_REG8(0x0227), 0x28 },
> +	{ CCI_REG8(0x0e0a), 0x00 },
> +	{ CCI_REG8(0x0e0b), 0x00 },
> +	{ CCI_REG8(0x0e24), 0x04 },
> +	{ CCI_REG8(0x0e25), 0x04 },
> +	{ CCI_REG8(0x0e26), 0x00 },
> +	{ CCI_REG8(0x0e27), 0x10 },
> +	{ CCI_REG8(0x0e01), 0x74 },
> +	{ CCI_REG8(0x0e03), 0x47 },
> +	{ CCI_REG8(0x0e04), 0x33 },
> +	{ CCI_REG8(0x0e05), 0x44 },
> +	{ CCI_REG8(0x0e06), 0x44 },
> +	{ CCI_REG8(0x0e0c), 0x1e },
> +	{ CCI_REG8(0x0e17), 0x3a },
> +	{ CCI_REG8(0x0e18), 0x3c },
> +	{ CCI_REG8(0x0e19), 0x40 },
> +	{ CCI_REG8(0x0e1a), 0x42 },
> +	{ CCI_REG8(0x0e28), 0x21 },
> +	{ CCI_REG8(0x0e2b), 0x68 },
> +	{ CCI_REG8(0x0e2c), 0x0d },
> +	{ CCI_REG8(0x0e2d), 0x08 },
> +	{ CCI_REG8(0x0e34), 0xf4 },
> +	{ CCI_REG8(0x0e35), 0x44 },
> +	{ CCI_REG8(0x0e36), 0x07 },
> +	{ CCI_REG8(0x0e38), 0x49 },
> +	{ CCI_REG8(0x0210), 0x13 },
> +	{ CCI_REG8(0x0218), 0x00 },
> +	{ CCI_REG8(0x0241), 0x88 },
> +	{ CCI_REG8(0x0e32), 0x00 },
> +	{ CCI_REG8(0x0e33), 0x18 },
> +	{ CCI_REG8(0x0e42), 0x03 },
> +	{ CCI_REG8(0x0e43), 0x80 },
> +	{ CCI_REG8(0x0e44), 0x04 },
> +	{ CCI_REG8(0x0e45), 0x00 },
> +	{ CCI_REG8(0x0e4f), 0x04 },
> +	{ CCI_REG8(0x057a), 0x20 },
> +	{ CCI_REG8(0x0381), 0x7c },
> +	{ CCI_REG8(0x0382), 0x9b },
> +	{ CCI_REG8(0x0384), 0xfb },
> +	{ CCI_REG8(0x0389), 0x38 },
> +	{ CCI_REG8(0x038a), 0x03 },
> +	{ CCI_REG8(0x0390), 0x6a },
> +	{ CCI_REG8(0x0391), 0x0b },
> +	{ CCI_REG8(0x0392), 0x60 },
> +	{ CCI_REG8(0x0393), 0xc1 },
> +	{ CCI_REG8(0x0396), 0xff },
> +	{ CCI_REG8(0x0398), 0x62 },
> +
> +	/* cisctl reset */
> +	{ CCI_REG8(0x031c), 0x80 },
> +	{ CCI_REG8(0x03fe), 0x10 },
> +	{ CCI_REG8(0x03fe), 0x00 },
> +	{ CCI_REG8(0x031c), 0x9f },
> +	{ CCI_REG8(0x03fe), 0x00 },
> +	{ CCI_REG8(0x03fe), 0x00 },
> +	{ CCI_REG8(0x03fe), 0x00 },
> +	{ CCI_REG8(0x03fe), 0x00 },
> +	{ CCI_REG8(0x031c), 0x80 },
> +	{ CCI_REG8(0x03fe), 0x10 },
> +	{ CCI_REG8(0x03fe), 0x00 },
> +	{ CCI_REG8(0x031c), 0x9f },
> +	{ CCI_REG8(0x0360), 0x01 },
> +	{ CCI_REG8(0x0360), 0x00 },
> +	{ CCI_REG8(0x0316), 0x09 },
> +	{ CCI_REG8(0x0a67), 0x80 },
> +	{ CCI_REG8(0x0313), 0x00 },
> +	{ CCI_REG8(0x0a53), 0x0e },
> +	{ CCI_REG8(0x0a65), 0x17 },
> +	{ CCI_REG8(0x0a68), 0xa1 },
> +	{ CCI_REG8(0x0a58), 0x00 },
> +	{ CCI_REG8(0x0ace), 0x0c },
> +	{ CCI_REG8(0x00a4), 0x00 },
> +	{ CCI_REG8(0x00a5), 0x01 },
> +	{ CCI_REG8(0x00a7), 0x09 },
> +	{ CCI_REG8(0x00a8), 0x9c },
> +	{ CCI_REG8(0x00a9), 0x0c },
> +	{ CCI_REG8(0x00aa), 0xd0 },
> +	{ CCI_REG8(0x0a8a), 0x00 },
> +	{ CCI_REG8(0x0a8b), 0xe0 },
> +	{ CCI_REG8(0x0a8c), 0x13 },
> +	{ CCI_REG8(0x0a8d), 0xe8 },
> +	{ CCI_REG8(0x0a90), 0x0a },
> +	{ CCI_REG8(0x0a91), 0x10 },
> +	{ CCI_REG8(0x0a92), 0xf8 },
> +	{ CCI_REG8(0x0a71), 0xf2 },
> +	{ CCI_REG8(0x0a72), 0x12 },
> +	{ CCI_REG8(0x0a73), 0x64 },
> +	{ CCI_REG8(0x0a75), 0x41 },
> +	{ CCI_REG8(0x0a70), 0x07 },
> +	{ CCI_REG8(0x0313), 0x80 },
> +
> +	/* ISP */
> +	{ CCI_REG8(0x00a0), 0x01 },
> +	{ CCI_REG8(0x0080), 0xd2 },
> +	{ CCI_REG8(0x0081), 0x3f },
> +	{ CCI_REG8(0x0087), 0x51 },
> +	{ CCI_REG8(0x0089), 0x03 },
> +	{ CCI_REG8(0x009b), 0x40 },
> +	{ CCI_REG8(0x05a0), 0x82 },
> +	{ CCI_REG8(0x05ac), 0x00 },
> +	{ CCI_REG8(0x05ad), 0x01 },
> +	{ CCI_REG8(0x05ae), 0x00 },
> +	{ CCI_REG8(0x0800), 0x0a },
> +	{ CCI_REG8(0x0801), 0x14 },
> +	{ CCI_REG8(0x0802), 0x28 },
> +	{ CCI_REG8(0x0803), 0x34 },
> +	{ CCI_REG8(0x0804), 0x0e },
> +	{ CCI_REG8(0x0805), 0x33 },
> +	{ CCI_REG8(0x0806), 0x03 },
> +	{ CCI_REG8(0x0807), 0x8a },
> +	{ CCI_REG8(0x0808), 0x50 },
> +	{ CCI_REG8(0x0809), 0x00 },
> +	{ CCI_REG8(0x080a), 0x34 },
> +	{ CCI_REG8(0x080b), 0x03 },
> +	{ CCI_REG8(0x080c), 0x26 },
> +	{ CCI_REG8(0x080d), 0x03 },
> +	{ CCI_REG8(0x080e), 0x18 },
> +	{ CCI_REG8(0x080f), 0x03 },
> +	{ CCI_REG8(0x0810), 0x10 },
> +	{ CCI_REG8(0x0811), 0x03 },
> +	{ CCI_REG8(0x0812), 0x00 },
> +	{ CCI_REG8(0x0813), 0x00 },
> +	{ CCI_REG8(0x0814), 0x01 },
> +	{ CCI_REG8(0x0815), 0x00 },
> +	{ CCI_REG8(0x0816), 0x01 },
> +	{ CCI_REG8(0x0817), 0x00 },
> +	{ CCI_REG8(0x0818), 0x00 },
> +	{ CCI_REG8(0x0819), 0x0a },
> +	{ CCI_REG8(0x081a), 0x01 },
> +	{ CCI_REG8(0x081b), 0x6c },
> +	{ CCI_REG8(0x081c), 0x00 },
> +	{ CCI_REG8(0x081d), 0x0b },
> +	{ CCI_REG8(0x081e), 0x02 },
> +	{ CCI_REG8(0x081f), 0x00 },
> +	{ CCI_REG8(0x0820), 0x00 },
> +	{ CCI_REG8(0x0821), 0x0c },
> +	{ CCI_REG8(0x0822), 0x02 },
> +	{ CCI_REG8(0x0823), 0xd9 },
> +	{ CCI_REG8(0x0824), 0x00 },
> +	{ CCI_REG8(0x0825), 0x0d },
> +	{ CCI_REG8(0x0826), 0x03 },
> +	{ CCI_REG8(0x0827), 0xf0 },
> +	{ CCI_REG8(0x0828), 0x00 },
> +	{ CCI_REG8(0x0829), 0x0e },
> +	{ CCI_REG8(0x082a), 0x05 },
> +	{ CCI_REG8(0x082b), 0x94 },
> +	{ CCI_REG8(0x082c), 0x09 },
> +	{ CCI_REG8(0x082d), 0x6e },
> +	{ CCI_REG8(0x082e), 0x07 },
> +	{ CCI_REG8(0x082f), 0xe6 },
> +	{ CCI_REG8(0x0830), 0x10 },
> +	{ CCI_REG8(0x0831), 0x0e },
> +	{ CCI_REG8(0x0832), 0x0b },
> +	{ CCI_REG8(0x0833), 0x2c },
> +	{ CCI_REG8(0x0834), 0x14 },
> +	{ CCI_REG8(0x0835), 0xae },
> +	{ CCI_REG8(0x0836), 0x0f },
> +	{ CCI_REG8(0x0837), 0xc4 },
> +	{ CCI_REG8(0x0838), 0x18 },
> +	{ CCI_REG8(0x0839), 0x0e },
> +	{ CCI_REG8(0x05ac), 0x01 },
> +	{ CCI_REG8(0x059a), 0x00 },
> +	{ CCI_REG8(0x059b), 0x00 },
> +	{ CCI_REG8(0x059c), 0x01 },
> +	{ CCI_REG8(0x0598), 0x00 },
> +	{ CCI_REG8(0x0597), 0x14 },
> +	{ CCI_REG8(0x05ab), 0x09 },
> +	{ CCI_REG8(0x05a4), 0x02 },
> +	{ CCI_REG8(0x05a3), 0x05 },
> +	{ CCI_REG8(0x05a0), 0xc2 },
> +	{ CCI_REG8(0x0207), 0xc4 },
> +
> +	/* GAIN */
> +	{ CCI_REG8(0x0208), 0x01 },
> +	{ CCI_REG8(0x0209), 0x72 },
> +	{ CCI_REG8(0x0204), 0x04 },
> +	{ CCI_REG8(0x0205), 0x00 },
> +
> +	{ CCI_REG8(0x0040), 0x22 },
> +	{ CCI_REG8(0x0041), 0x20 },
> +	{ CCI_REG8(0x0043), 0x10 },
> +	{ CCI_REG8(0x0044), 0x00 },
> +	{ CCI_REG8(0x0046), 0x08 },
> +	{ CCI_REG8(0x0047), 0xf0 },
> +	{ CCI_REG8(0x0048), 0x0f },
> +	{ CCI_REG8(0x004b), 0x0f },
> +	{ CCI_REG8(0x004c), 0x00 },
> +	{ CCI_REG8(0x0050), 0x5c },
> +	{ CCI_REG8(0x0051), 0x44 },
> +	{ CCI_REG8(0x005b), 0x03 },
> +	{ CCI_REG8(0x00c0), 0x00 },
> +	{ CCI_REG8(0x00c1), 0x80 },
> +	{ CCI_REG8(0x00c2), 0x31 },
> +	{ CCI_REG8(0x00c3), 0x00 },
> +	{ CCI_REG8(0x0460), 0x04 },
> +	{ CCI_REG8(0x0462), 0x08 },
> +	{ CCI_REG8(0x0464), 0x0e },
> +	{ CCI_REG8(0x0466), 0x0a },
> +	{ CCI_REG8(0x0468), 0x12 },
> +	{ CCI_REG8(0x046a), 0x12 },
> +	{ CCI_REG8(0x046c), 0x10 },
> +	{ CCI_REG8(0x046e), 0x0c },
> +	{ CCI_REG8(0x0461), 0x03 },
> +	{ CCI_REG8(0x0463), 0x03 },
> +	{ CCI_REG8(0x0465), 0x03 },
> +	{ CCI_REG8(0x0467), 0x03 },
> +	{ CCI_REG8(0x0469), 0x04 },
> +	{ CCI_REG8(0x046b), 0x04 },
> +	{ CCI_REG8(0x046d), 0x04 },
> +	{ CCI_REG8(0x046f), 0x04 },
> +	{ CCI_REG8(0x0470), 0x04 },
> +	{ CCI_REG8(0x0472), 0x10 },
> +	{ CCI_REG8(0x0474), 0x26 },
> +	{ CCI_REG8(0x0476), 0x38 },
> +	{ CCI_REG8(0x0478), 0x20 },
> +	{ CCI_REG8(0x047a), 0x30 },
> +	{ CCI_REG8(0x047c), 0x38 },
> +	{ CCI_REG8(0x047e), 0x60 },
> +	{ CCI_REG8(0x0471), 0x05 },
> +	{ CCI_REG8(0x0473), 0x05 },
> +	{ CCI_REG8(0x0475), 0x05 },
> +	{ CCI_REG8(0x0477), 0x05 },
> +	{ CCI_REG8(0x0479), 0x04 },
> +	{ CCI_REG8(0x047b), 0x04 },
> +	{ CCI_REG8(0x047d), 0x04 },
> +	{ CCI_REG8(0x047f), 0x04 },
> +};
> +
> +static const struct gc08a3_link_freq_config link_freq_configs[] = {

Instead of adding such arrays and indices to them, please instead use a
pointer to what corresponds an array entry here. It's easier and less
error-prone.

> +	[GC08A3_LINK_FREQ_336MHZ_INDEX] = {
> +		.reg_list = {
> +			.num_of_regs = ARRAY_SIZE(mode_table_common),
> +			.regs = mode_table_common,
> +		}
> +	},
> +	[GC08A3_LINK_FREQ_207MHZ_INDEX] = {
> +		.reg_list = {
> +			.num_of_regs = ARRAY_SIZE(mode_table_common),
> +			.regs = mode_table_common,
> +		}
> +	},
> +};
> +
> +struct gc08a3_mode {
> +	u32 width;
> +	u32 height;
> +	const struct gc08a3_reg_list reg_list;
> +
> +	u32 hts; /* Horizontal timining size */
> +	u32 vts_def; /* Default vertical timining size */
> +	u32 vts_min; /* Min vertical timining size */
> +	u32 link_freq_index; /* Link frequency needed for this resolution */
> +	u32 max_framerate;
> +};
> +
> +/*
> + * Declare modes in order, from biggest
> + * to smallest height.
> + */
> +static const struct gc08a3_mode gc08a3_modes[] = {
> +	{
> +		.width = GC08A3_NATIVE_WIDTH,
> +		.height = GC08A3_NATIVE_HEIGHT,
> +		.reg_list = {
> +			.num_of_regs = ARRAY_SIZE(mode_3264x2448),
> +			.regs = mode_3264x2448,
> +		},
> +		.link_freq_index = GC08A3_LINK_FREQ_336MHZ_INDEX,

This should be a reference to a data structure specific to 366 MHz link
frequency.

> +
> +		.hts = GC08A3_HTS_30FPS,
> +		.vts_def = GC08A3_VTS_30FPS,
> +		.vts_min = GC08A3_VTS_30FPS_MIN,
> +		.max_framerate = 300,
> +	},
> +	{
> +		.width = 1920,
> +		.height = 1080,
> +		.reg_list = {
> +			.num_of_regs = ARRAY_SIZE(mode_1920x1080),
> +			.regs = mode_1920x1080,
> +		},
> +		.link_freq_index = GC08A3_LINK_FREQ_207MHZ_INDEX,
> +
> +		.hts = GC08A3_HTS_60FPS,
> +		.vts_def = GC08A3_VTS_60FPS,
> +		.vts_min = GC08A3_VTS_60FPS_MIN,
> +		.max_framerate = 600,
> +	},
> +};
> +
> +static u64 to_pixel_rate(u32 f_index)
> +{
> +	u64 pixel_rate = link_freq_menu_items[f_index] * 2 * GC08A3_DATA_LANES;
> +
> +	do_div(pixel_rate, GC08A3_RGB_DEPTH);
> +
> +	return pixel_rate;
> +}
> +
> +static int gc08a3_identify_module(struct gc08a3 *gc08a3)
> +{
> +	struct i2c_client *client = v4l2_get_subdevdata(&gc08a3->sd);
> +	u64 val = 0;
> +	int ret;
> +
> +	ret = cci_read(gc08a3->regmap, GC08A3_REG_CHIP_ID, &val, NULL);
> +	if (ret) {
> +		dev_err(&client->dev, "failed to read chip id: 0x%x", GC08A3_CHIP_ID);
> +		return ret;
> +	}
> +
> +	if (val != GC08A3_CHIP_ID) {
> +		dev_err(&client->dev, "chip id mismatch: 0x%x!=0x%llx",
> +			GC08A3_CHIP_ID, val);
> +		return -ENXIO;
> +	}
> +
> +	return 0;
> +}
> +
> +static inline struct gc08a3 *to_gc08a3(struct v4l2_subdev *sd)
> +{
> +	return container_of(sd, struct gc08a3, sd);
> +}
> +
> +static int gc08a3_power_on(struct device *dev)
> +{
> +	struct i2c_client *client = to_i2c_client(dev);
> +	struct v4l2_subdev *sd = i2c_get_clientdata(client);
> +	struct gc08a3 *gc08a3 = to_gc08a3(sd);
> +	int ret;
> +
> +	ret = regulator_bulk_enable(GC08A3_NUM_SUPPLIES, gc08a3->supplies);
> +	if (ret < 0) {
> +		dev_err(gc08a3->dev, "failed to enable regulators: %d\n", ret);
> +		return ret;
> +	}
> +
> +	ret = clk_prepare_enable(gc08a3->xclk);
> +	if (ret < 0) {
> +		regulator_bulk_disable(GC08A3_NUM_SUPPLIES, gc08a3->supplies);
> +		dev_err(gc08a3->dev, "clk prepare enable failed\n");
> +		return ret;
> +	}
> +
> +	usleep_range(GC08A3_MIN_SLEEP_US, GC08A3_MAX_SLEEP_US);
> +
> +	gpiod_set_value_cansleep(gc08a3->reset_gpio, 1);
> +	usleep_range(GC08A3_MIN_SLEEP_US, GC08A3_MAX_SLEEP_US);
> +
> +	return 0;
> +}
> +
> +static int gc08a3_power_off(struct device *dev)
> +{
> +	struct i2c_client *client = to_i2c_client(dev);
> +	struct v4l2_subdev *sd = i2c_get_clientdata(client);
> +	struct gc08a3 *gc08a3 = to_gc08a3(sd);
> +
> +	clk_disable_unprepare(gc08a3->xclk);
> +
> +	usleep_range(GC08A3_MIN_SLEEP_US, GC08A3_MAX_SLEEP_US);
> +
> +	gpiod_set_value_cansleep(gc08a3->reset_gpio, 0);
> +	usleep_range(GC08A3_MIN_SLEEP_US, GC08A3_MAX_SLEEP_US);
> +
> +	regulator_bulk_disable(GC08A3_NUM_SUPPLIES, gc08a3->supplies);
> +	usleep_range(GC08A3_MIN_SLEEP_US, GC08A3_MAX_SLEEP_US);
> +
> +	return 0;
> +}
> +
> +static int gc08a3_enum_mbus_code(struct v4l2_subdev *sd,
> +				 struct v4l2_subdev_state *sd_state,
> +				 struct v4l2_subdev_mbus_code_enum *code)
> +{
> +	if (code->index > 0)
> +		return -EINVAL;
> +
> +	code->code = GC08A3_MBUS_CODE;
> +
> +	return 0;
> +}
> +
> +static int gc08a3_enum_frame_size(struct v4l2_subdev *subdev,
> +				  struct v4l2_subdev_state *sd_state,
> +				  struct v4l2_subdev_frame_size_enum *fse)
> +{
> +	if (fse->code != GC08A3_MBUS_CODE)
> +		return -EINVAL;
> +
> +	if (fse->index >= ARRAY_SIZE(gc08a3_modes))
> +		return -EINVAL;
> +
> +	fse->min_width = gc08a3_modes[fse->index].width;
> +	fse->max_width = gc08a3_modes[fse->index].width;
> +	fse->min_height = gc08a3_modes[fse->index].height;
> +	fse->max_height = gc08a3_modes[fse->index].height;
> +
> +	return 0;
> +}
> +
> +static int gc08a3_update_cur_mode_controls(struct gc08a3 *gc08a3, const struct gc08a3_mode *mode)
> +{
> +	s64 exposure_max, h_blank;
> +	int ret = 0;
> +
> +	ret = __v4l2_ctrl_modify_range(gc08a3->vblank,
> +				       mode->vts_min - mode->height,
> +				       GC08A3_VTS_MAX - mode->height, 1,
> +				       mode->vts_def - mode->height);
> +	if (ret)
> +		dev_err(gc08a3->dev, "VB ctrl range update failed\n");
> +
> +	h_blank = mode->hts - mode->width;
> +	ret = __v4l2_ctrl_modify_range(gc08a3->hblank, h_blank, h_blank, 1,
> +				       h_blank);
> +	if (ret)
> +		dev_err(gc08a3->dev, "HB ctrl range update failed\n");
> +
> +	exposure_max = mode->vts_def - GC08A3_EXP_MARGIN;
> +	ret = __v4l2_ctrl_modify_range(gc08a3->exposure, GC08A3_EXP_MIN,
> +				       exposure_max, GC08A3_EXP_STEP,
> +				       exposure_max);
> +	if (ret)
> +		dev_err(gc08a3->dev, "exposure ctrl range update failed\n");
> +
> +	return ret;
> +}
> +
> +static void gc08a3_update_pad_format(struct gc08a3 *gc08a3,
> +				     const struct gc08a3_mode *mode,
> +				     struct v4l2_mbus_framefmt *fmt)
> +{
> +	fmt->width = mode->width;
> +	fmt->height = mode->height;
> +	fmt->code = GC08A3_MBUS_CODE;
> +	fmt->field = V4L2_FIELD_NONE;
> +	fmt->colorspace = V4L2_COLORSPACE_SRGB;
> +	fmt->ycbcr_enc = V4L2_MAP_YCBCR_ENC_DEFAULT(fmt->colorspace);
> +	fmt->quantization =
> +		V4L2_MAP_QUANTIZATION_DEFAULT(true, fmt->colorspace, fmt->ycbcr_enc);
> +	fmt->xfer_func = V4L2_MAP_XFER_FUNC_DEFAULT(fmt->colorspace);
> +}
> +
> +static int gc08a3_set_format(struct v4l2_subdev *sd,
> +			     struct v4l2_subdev_state *state,
> +			     struct v4l2_subdev_format *fmt)
> +{
> +	struct gc08a3 *gc08a3 = to_gc08a3(sd);
> +	struct v4l2_mbus_framefmt *mbus_fmt;
> +	struct v4l2_rect *crop;
> +	const struct gc08a3_mode *mode;
> +
> +	mode = v4l2_find_nearest_size(gc08a3_modes, ARRAY_SIZE(gc08a3_modes),
> +				      width, height, fmt->format.width,
> +				      fmt->format.height);
> +
> +	/*update crop info to subdev state*/
> +	crop = v4l2_subdev_state_get_crop(state, 0);
> +	crop->width = mode->width;
> +	crop->height = mode->height;
> +
> +	/*update fmt info to subdev state*/
> +	gc08a3_update_pad_format(gc08a3, mode, &fmt->format);
> +	mbus_fmt = v4l2_subdev_state_get_format(state, 0);
> +	*mbus_fmt = fmt->format;
> +
> +	if (fmt->which == V4L2_SUBDEV_FORMAT_TRY)
> +		return 0;
> +
> +	gc08a3->cur_mode = mode;
> +	gc08a3_update_cur_mode_controls(gc08a3, mode);
> +
> +	return 0;
> +}
> +
> +static int gc08a3_get_selection(struct v4l2_subdev *sd,
> +				struct v4l2_subdev_state *state,
> +				struct v4l2_subdev_selection *sel)
> +{
> +	struct gc08a3 *gc08a3 = to_gc08a3(sd);
> +
> +	switch (sel->target) {
> +	case V4L2_SEL_TGT_CROP:
> +		sel->r = *v4l2_subdev_state_get_crop(state, 0);
> +		break;
> +	case V4L2_SEL_TGT_CROP_BOUNDS:
> +		sel->r.top = 0;
> +		sel->r.left = 0;
> +		sel->r.width = GC08A3_NATIVE_WIDTH;
> +		sel->r.height = GC08A3_NATIVE_HEIGHT;
> +		break;
> +	case V4L2_SEL_TGT_CROP_DEFAULT:
> +		if (gc08a3->cur_mode->width == GC08A3_NATIVE_WIDTH) {
> +			sel->r.top = 0;
> +			sel->r.left = 0;
> +			sel->r.width = GC08A3_NATIVE_WIDTH;
> +			sel->r.height = GC08A3_NATIVE_HEIGHT;

Couuld you obtain these from the mode?

> +		} else {
> +			sel->r.top = 0;
> +			sel->r.left = 0;
> +			sel->r.width = 1920;
> +			sel->r.height = 1080;

This, too?

> +		}
> +		break;
> +	default:
> +		return -EINVAL;
> +	}
> +
> +	return 0;
> +}
> +
> +static int gc08a3_init_state(struct v4l2_subdev *sd,
> +			     struct v4l2_subdev_state *state)
> +{
> +	struct v4l2_subdev_format fmt = {
> +		.which = V4L2_SUBDEV_FORMAT_TRY,
> +		.pad = 0,
> +		.format = {
> +			.code = GC08A3_MBUS_CODE,
> +			.width = gc08a3_modes[0].width,
> +			.height = gc08a3_modes[0].height,
> +		},
> +	};
> +
> +	gc08a3_set_format(sd, state, &fmt);
> +
> +	return 0;
> +}
> +
> +static int gc08a3_set_ctrl_hflip(struct gc08a3 *gc08a3, u32 ctrl_val)
> +{
> +	int ret;
> +	u64 val;
> +
> +	ret = cci_read(gc08a3->regmap, GC08A3_FLIP_REG, &val, NULL);
> +	if (ret) {
> +		dev_err(gc08a3->dev, "read hflip register failed: %d\n", ret);
> +		return ret;
> +	}
> +
> +	val = ctrl_val ? (val | GC08A3_FLIP_H_MASK) :
> +			   (val & ~GC08A3_FLIP_H_MASK);
> +	ret = cci_write(gc08a3->regmap, GC08A3_FLIP_REG, val, NULL);
> +	if (ret < 0)
> +		dev_err(gc08a3->dev, "Error %d\n", ret);
> +
> +	return ret;
> +}
> +
> +static int gc08a3_set_ctrl_vflip(struct gc08a3 *gc08a3, u32 ctrl_val)
> +{
> +	int ret;
> +	u64 val;
> +
> +	ret = cci_read(gc08a3->regmap, GC08A3_FLIP_REG, &val, NULL);
> +	if (ret) {
> +		dev_err(gc08a3->dev, "read vflip register failed: %d\n", ret);
> +		return ret;
> +	}
> +
> +	val = ctrl_val ? (val | GC08A3_FLIP_V_MASK) :
> +			   (val & ~GC08A3_FLIP_V_MASK);
> +	ret = cci_write(gc08a3->regmap, GC08A3_FLIP_REG, val, NULL);
> +	if (ret < 0)
> +		dev_err(gc08a3->dev, "Error %d\n", ret);
> +
> +	return ret;
> +}
> +
> +static int gc08a3_test_pattern(struct gc08a3 *gc08a3, u32 pattern_menu)
> +{
> +	int ret = 0;

Please declare ret as last. Elsewhere, too.

> +	u32 pattern = 0;
> +
> +	if (pattern_menu) {
> +		switch (pattern_menu) {
> +		case 1:
> +			pattern = 0x00;
> +			break;
> +		case 2:
> +			pattern = 0x10;
> +			break;
> +		case 3:
> +		case 4:
> +		case 5:
> +		case 6:
> +		case 7:
> +			pattern = pattern_menu + 1;
> +			break;
> +		}
> +
> +		ret = cci_write(gc08a3->regmap, GC08A3_REG_TEST_PATTERN_EN,
> +				GC08A3_TEST_PATTERN_EN, NULL);
> +		if (ret) {
> +			dev_err(gc08a3->dev, "test pattern enable failed: %d\n", ret);

I'm not sure how useful these separate debug prints are. Error handling
could be simplified without them nonetheless.

> +			return ret;
> +		}
> +
> +		ret = cci_write(gc08a3->regmap, GC08A3_REG_TEST_PATTERN_IDX,
> +				pattern, NULL);
> +		if (ret < 0)
> +			dev_err(gc08a3->dev, "Error %d\n", ret);
> +
> +	} else {
> +		ret = cci_write(gc08a3->regmap, GC08A3_REG_TEST_PATTERN_EN,
> +				0x00, NULL);
> +		if (ret < 0)
> +			dev_err(gc08a3->dev, "test pattern disable failed: %d\n", ret);
> +	}
> +
> +	return ret;
> +}
> +
> +static int gc08a3_set_ctrl(struct v4l2_ctrl *ctrl)
> +{
> +	struct gc08a3 *gc08a3 =
> +		container_of(ctrl->handler, struct gc08a3, ctrls);
> +	int ret = 0;
> +	s64 exposure_max;
> +
> +	if (ctrl->id == V4L2_CID_VBLANK) {
> +		/* Update max exposure while meeting expected vblanking */
> +		exposure_max = gc08a3->cur_mode->height + ctrl->val -
> +			       GC08A3_EXP_MARGIN;
> +		__v4l2_ctrl_modify_range(gc08a3->exposure,
> +					 gc08a3->exposure->minimum,
> +					 exposure_max, gc08a3->exposure->step,
> +					 exposure_max);
> +	}
> +
> +	/*
> +	 * Applying V4L2 control value only happens
> +	 * when power is on for streaming
> +	 */
> +	if (!pm_runtime_get_if_in_use(gc08a3->dev))
> +		return 0;
> +
> +	switch (ctrl->id) {
> +	case V4L2_CID_EXPOSURE:
> +		ret = cci_write(gc08a3->regmap, GC08A3_EXP_REG, ctrl->val, NULL);
> +		break;
> +
> +	case V4L2_CID_ANALOGUE_GAIN:
> +		ret = cci_write(gc08a3->regmap, GC08A3_AGAIN_REG, ctrl->val, NULL);

Please run:

	./scripts/checkpatch.pl --strict --max-line-length=80

> +		break;
> +
> +	case V4L2_CID_VBLANK:
> +		ret = cci_write(gc08a3->regmap, GC08A3_FRAME_LENGTH_REG,
> +				gc08a3->cur_mode->height + ctrl->val, NULL);
> +		break;
> +
> +	case V4L2_CID_HFLIP:
> +		ret = gc08a3_set_ctrl_hflip(gc08a3, ctrl->val);
> +		break;
> +
> +	case V4L2_CID_VFLIP:
> +		ret = gc08a3_set_ctrl_vflip(gc08a3, ctrl->val);
> +		break;
> +
> +	case V4L2_CID_TEST_PATTERN:
> +		ret = gc08a3_test_pattern(gc08a3, ctrl->val);
> +		break;
> +
> +	default:
> +		break;
> +	}
> +
> +	pm_runtime_put(gc08a3->dev);
> +
> +	return ret;
> +}
> +
> +static const struct v4l2_ctrl_ops gc08a3_ctrl_ops = {
> +	.s_ctrl = gc08a3_set_ctrl,
> +};
> +
> +static int gc08a3_start_streaming(struct gc08a3 *gc08a3)
> +{
> +	const struct gc08a3_mode *mode;
> +	const struct gc08a3_reg_list *reg_list;
> +	int link_freq_index;
> +	int ret;
> +
> +	ret = pm_runtime_resume_and_get(gc08a3->dev);
> +	if (ret < 0)
> +		return ret;
> +
> +	link_freq_index = gc08a3->cur_mode->link_freq_index;
> +
> +	reg_list = &link_freq_configs[link_freq_index].reg_list;
> +	ret = cci_multi_reg_write(gc08a3->regmap,
> +				  reg_list->regs, reg_list->num_of_regs, NULL);
> +	if (ret) {
> +		dev_err(gc08a3->dev, "could not sent common table %d\n", ret);
> +		goto err_rpm_put;
> +	}
> +
> +	mode = gc08a3->cur_mode;
> +	reg_list = &mode->reg_list;
> +	ret = cci_multi_reg_write(gc08a3->regmap,
> +				  reg_list->regs, reg_list->num_of_regs, NULL);
> +	if (ret < 0) {
> +		dev_err(gc08a3->dev, "could not sent mode table %d\n", ret);
> +		goto err_rpm_put;
> +	}
> +
> +	ret = __v4l2_ctrl_handler_setup(&gc08a3->ctrls);
> +	if (ret < 0) {
> +		dev_err(gc08a3->dev, "could not sync v4l2 controls\n");
> +		goto err_rpm_put;
> +	}
> +
> +	ret = cci_write(gc08a3->regmap, GC08A3_STRAEMING_REG, 1, NULL);
> +	if (ret < 0) {
> +		dev_err(gc08a3->dev, "write STRAEMING_REG failed: %d\n", ret);
> +		goto err_rpm_put;
> +	}
> +
> +	return 0;
> +
> +err_rpm_put:
> +	pm_runtime_put(gc08a3->dev);
> +	return ret;
> +}
> +
> +static int gc08a3_stop_streaming(struct gc08a3 *gc08a3)
> +{
> +	int ret;
> +
> +	ret = cci_write(gc08a3->regmap, GC08A3_STRAEMING_REG, 0, NULL);
> +	if (ret < 0)
> +		dev_err(gc08a3->dev, "could not sent stop streaming %d\n", ret);
> +
> +	pm_runtime_put(gc08a3->dev);
> +	return ret;
> +}
> +
> +static int gc08a3_s_stream(struct v4l2_subdev *subdev, int enable)
> +{
> +	struct gc08a3 *gc08a3 = to_gc08a3(subdev);
> +	struct v4l2_subdev_state *state;
> +	int ret;
> +
> +	state = v4l2_subdev_lock_and_get_active_state(subdev);
> +
> +	if (enable)
> +		ret = gc08a3_start_streaming(gc08a3);
> +	else
> +		ret = gc08a3_stop_streaming(gc08a3);
> +
> +	gc08a3->streaming = enable;
> +	v4l2_subdev_unlock_state(state);
> +
> +	return ret;
> +}
> +
> +static int gc08a3_g_mbus_config(struct v4l2_subdev *sd, unsigned int pad,
> +				struct v4l2_mbus_config *config)
> +{
> +	config->type = V4L2_MBUS_CSI2_DPHY;
> +	config->bus.mipi_csi2.num_data_lanes = 4;
> +	config->bus.mipi_csi2.flags = 0;
> +	return 0;

Please drop this, the downstream sub-device can obtain the configuration
from the endpoint.

> +}
> +
> +static int gc08a3_enum_frame_interval(struct v4l2_subdev *subdev,
> +				      struct v4l2_subdev_state *sd_state,
> +				      struct v4l2_subdev_frame_interval_enum *fie)
> +{
> +	unsigned int index = fie->index;
> +	unsigned int i;
> +
> +	for (i = 0; i < ARRAY_SIZE(gc08a3_modes); i++) {
> +		if (fie->width != gc08a3_modes[i].width ||
> +		    fie->height != gc08a3_modes[i].height)
> +			continue;
> +
> +		if (index-- == 0) {
> +			fie->interval.numerator = 1;
> +			fie->interval.denominator = gc08a3_modes[i].max_framerate / 10;
> +			return 0;
> +		}
> +	}
> +
> +	return -EINVAL;
> +}
> +
> +static const struct v4l2_subdev_video_ops gc08a3_video_ops = {
> +	.s_stream = gc08a3_s_stream,
> +};
> +
> +static const struct v4l2_subdev_pad_ops gc08a3_subdev_pad_ops = {
> +	.enum_mbus_code = gc08a3_enum_mbus_code,
> +	.enum_frame_size = gc08a3_enum_frame_size,
> +	.enum_frame_interval = gc08a3_enum_frame_interval,
> +	.get_fmt = v4l2_subdev_get_fmt,
> +	.set_fmt = gc08a3_set_format,
> +	.get_selection = gc08a3_get_selection,
> +	.get_mbus_config = gc08a3_g_mbus_config,
> +};
> +
> +static const struct v4l2_subdev_core_ops gc08a3_core_ops = {
> +	.subscribe_event = v4l2_ctrl_subdev_subscribe_event,
> +	.unsubscribe_event = v4l2_event_subdev_unsubscribe,
> +};
> +
> +static const struct v4l2_subdev_ops gc08a3_subdev_ops = {
> +	.core = &gc08a3_core_ops,
> +	.video = &gc08a3_video_ops,
> +	.pad = &gc08a3_subdev_pad_ops,
> +};
> +
> +static const struct v4l2_subdev_internal_ops gc08a3_internal_ops = {
> +	.init_state = gc08a3_init_state,
> +};
> +
> +static int gc08a3_get_regulators(struct device *dev, struct gc08a3 *gc08a3)
> +{
> +	unsigned int i;
> +
> +	for (i = 0; i < GC08A3_NUM_SUPPLIES; i++)
> +		gc08a3->supplies[i].supply = gc08a3_supply_name[i];
> +
> +	return devm_regulator_bulk_get(dev, GC08A3_NUM_SUPPLIES,
> +				       gc08a3->supplies);
> +}
> +
> +static int gc08a3_parse_fwnode(struct device *dev)
> +{
> +	struct fwnode_handle *endpoint;
> +	struct v4l2_fwnode_endpoint bus_cfg = {
> +		.bus_type = V4L2_MBUS_CSI2_DPHY,
> +	};
> +	unsigned int i, j;
> +	int ret;
> +
> +	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_alloc_parse(endpoint, &bus_cfg);
> +	if (ret) {
> +		dev_err(dev, "parsing endpoint node failed\n");
> +		goto done;
> +	}
> +
> +	if (!bus_cfg.nr_of_link_frequencies) {
> +		dev_err(dev, "no link frequencies defined");
> +		ret = -EINVAL;
> +		goto done;
> +	}
> +
> +	for (i = 0; i < ARRAY_SIZE(link_freq_menu_items); i++) {
> +		for (j = 0; j < bus_cfg.nr_of_link_frequencies; j++) {
> +			if (link_freq_menu_items[i] ==
> +			    bus_cfg.link_frequencies[j])
> +				break;
> +		}
> +
> +		if (j == bus_cfg.nr_of_link_frequencies) {
> +			dev_err(dev,
> +				"no link frequency %lld supported, please check DT",
> +				link_freq_menu_items[i]);
> +			ret = -EINVAL;
> +			goto done;
> +		}
> +	}

Please use v4l2_link_freq_to_bitmap() available here
<URL:https://lore.kernel.org/linux-media/20240108151805.55584-2-sakari.ailus@linux.intel.com/T/#u>.
We'll then merge both at the same time.

> +
> +done:
> +	v4l2_fwnode_endpoint_free(&bus_cfg);
> +	fwnode_handle_put(endpoint);
> +	return ret;
> +}
> +
> +static int gc08a3_init_controls(struct gc08a3 *gc08a3)
> +{
> +	struct i2c_client *client = v4l2_get_subdevdata(&gc08a3->sd);
> +	const struct gc08a3_mode *mode = &gc08a3_modes[0];
> +	const struct v4l2_ctrl_ops *ops = &gc08a3_ctrl_ops;
> +	struct v4l2_fwnode_device_properties props;
> +	struct v4l2_ctrl_handler *ctrl_hdlr;
> +	s64 exposure_max, h_blank;
> +	int ret;
> +
> +	ctrl_hdlr = &gc08a3->ctrls;
> +	ret = v4l2_ctrl_handler_init(ctrl_hdlr, 10);
> +	if (ret)
> +		return ret;
> +
> +	gc08a3->link_freq =
> +		v4l2_ctrl_new_int_menu(ctrl_hdlr,
> +				       &gc08a3_ctrl_ops,
> +				       V4L2_CID_LINK_FREQ,
> +				       ARRAY_SIZE(link_freq_menu_items) - 1,
> +				       0, link_freq_menu_items);
> +	if (gc08a3->link_freq)
> +		gc08a3->link_freq->flags |= V4L2_CTRL_FLAG_READ_ONLY;
> +
> +	gc08a3->pixel_rate =
> +		v4l2_ctrl_new_std(ctrl_hdlr,
> +				  &gc08a3_ctrl_ops,
> +				  V4L2_CID_PIXEL_RATE, 0,
> +				  to_pixel_rate(GC08A3_LINK_FREQ_336MHZ_INDEX), 1,
> +				  to_pixel_rate(GC08A3_LINK_FREQ_336MHZ_INDEX));
> +
> +	gc08a3->vblank =
> +		v4l2_ctrl_new_std(ctrl_hdlr,
> +				  &gc08a3_ctrl_ops, V4L2_CID_VBLANK,
> +				  mode->vts_min - mode->height,
> +				  GC08A3_VTS_MAX - mode->height, 1,
> +				  mode->vts_def - mode->height);
> +
> +	h_blank = mode->hts - mode->width;
> +	gc08a3->hblank = v4l2_ctrl_new_std(ctrl_hdlr, &gc08a3_ctrl_ops,
> +					   V4L2_CID_HBLANK, h_blank, h_blank, 1,
> +					   h_blank);
> +	if (gc08a3->hblank)
> +		gc08a3->hblank->flags |= V4L2_CTRL_FLAG_READ_ONLY;
> +
> +	v4l2_ctrl_new_std(ctrl_hdlr, &gc08a3_ctrl_ops,
> +			  V4L2_CID_ANALOGUE_GAIN, GC08A3_AGAIN_MIN,
> +			  GC08A3_AGAIN_MAX, GC08A3_AGAIN_STEP,
> +			  GC08A3_AGAIN_MIN);
> +
> +	exposure_max = mode->vts_def - GC08A3_EXP_MARGIN;
> +	gc08a3->exposure = v4l2_ctrl_new_std(ctrl_hdlr, &gc08a3_ctrl_ops,
> +					     V4L2_CID_EXPOSURE, GC08A3_EXP_MIN,
> +					     exposure_max, GC08A3_EXP_STEP,
> +					     exposure_max);
> +
> +	v4l2_ctrl_new_std_menu_items(ctrl_hdlr, &gc08a3_ctrl_ops,
> +				     V4L2_CID_TEST_PATTERN,
> +				     ARRAY_SIZE(gc08a3_test_pattern_menu) - 1,
> +				     0, 0, gc08a3_test_pattern_menu);
> +
> +	v4l2_ctrl_new_std(ctrl_hdlr, &gc08a3_ctrl_ops, V4L2_CID_HFLIP, 0,
> +			  1, 1, 0);
> +
> +	v4l2_ctrl_new_std(ctrl_hdlr, &gc08a3_ctrl_ops, V4L2_CID_VFLIP, 0,
> +			  1, 1, 0);
> +
> +	/* register properties to fwnode (e.g. rotation, orientation) */
> +	ret = v4l2_fwnode_device_parse(&client->dev, &props);
> +	if (ret)
> +		goto error_ctrls;
> +
> +	ret = v4l2_ctrl_new_fwnode_properties(ctrl_hdlr, ops, &props);
> +	if (ret)
> +		goto error_ctrls;
> +
> +	if (ctrl_hdlr->error) {
> +		ret = ctrl_hdlr->error;
> +		goto error_ctrls;
> +	}
> +
> +	gc08a3->sd.ctrl_handler = ctrl_hdlr;
> +
> +	return 0;
> +
> +error_ctrls:
> +	v4l2_ctrl_handler_free(ctrl_hdlr);
> +
> +	return ret;
> +}
> +
> +static int gc08a3_probe(struct i2c_client *client)
> +{
> +	struct device *dev = &client->dev;
> +	struct gc08a3 *gc08a3;
> +	int ret;
> +
> +	ret = gc08a3_parse_fwnode(dev);
> +	if (ret)
> +		return ret;
> +
> +	gc08a3 = devm_kzalloc(dev, sizeof(*gc08a3), GFP_KERNEL);
> +	if (!gc08a3)
> +		return -ENOMEM;
> +
> +	gc08a3->dev = dev;
> +
> +	gc08a3->regmap = devm_cci_regmap_init_i2c(client, 16);
> +	if (IS_ERR(gc08a3->regmap))
> +		return dev_err_probe(dev, PTR_ERR(gc08a3->regmap),
> +				     "failed to init CCI\n");
> +
> +	gc08a3->xclk = devm_clk_get(dev, NULL);
> +	if (IS_ERR(gc08a3->xclk))
> +		return dev_err_probe(dev, PTR_ERR(gc08a3->xclk),
> +				     "failed to get xclk\n");
> +
> +	ret = clk_set_rate(gc08a3->xclk, GC08A3_DEFAULT_CLK_FREQ);
> +	if (ret)
> +		return dev_err_probe(dev, ret,
> +				     "failed to set xclk frequency\n");
> +
> +	ret = gc08a3_get_regulators(dev, gc08a3);
> +	if (ret < 0)
> +		return dev_err_probe(dev, ret,
> +				     "failed to get regulators\n");
> +
> +	gc08a3->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
> +	if (IS_ERR(gc08a3->reset_gpio))
> +		return dev_err_probe(dev, PTR_ERR(gc08a3->reset_gpio),
> +				     "failed to get gpio\n");
> +
> +	v4l2_i2c_subdev_init(&gc08a3->sd, client, &gc08a3_subdev_ops);
> +	gc08a3->sd.internal_ops = &gc08a3_internal_ops;
> +	gc08a3->cur_mode = &gc08a3_modes[0];
> +
> +	ret = gc08a3_power_on(gc08a3->dev);
> +	if (ret)
> +		return dev_err_probe(dev, ret,
> +				     "failed to sensor power on\n");
> +
> +	ret = gc08a3_identify_module(gc08a3);
> +	if (ret) {
> +		dev_err(&client->dev, "failed to find sensor: %d\n", ret);
> +		goto err_power_off;
> +	}
> +
> +	ret = gc08a3_init_controls(gc08a3);
> +	if (ret) {
> +		dev_err(&client->dev, "failed to init controls: %d", ret);
> +		goto err_power_off;
> +	}
> +
> +	gc08a3->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE | V4L2_SUBDEV_FL_HAS_EVENTS;
> +	gc08a3->pad.flags = MEDIA_PAD_FL_SOURCE;
> +	gc08a3->sd.dev = &client->dev;
> +	gc08a3->sd.entity.function = MEDIA_ENT_F_CAM_SENSOR;
> +
> +	ret = media_entity_pads_init(&gc08a3->sd.entity, 1, &gc08a3->pad);
> +	if (ret < 0) {
> +		dev_err(dev, "could not register media entity\n");
> +		goto err_v4l2_ctrl_handler_free;
> +	}
> +
> +	gc08a3->sd.state_lock = gc08a3->ctrls.lock;
> +	ret = v4l2_subdev_init_finalize(&gc08a3->sd);
> +	if (ret < 0) {
> +		dev_err(dev, "v4l2 subdev init error: %d\n", ret);
> +		goto err_media_entity_cleanup;
> +	}
> +
> +	ret = v4l2_async_register_subdev_sensor(&gc08a3->sd);
> +	if (ret < 0) {
> +		dev_err(dev, "could not register v4l2 device\n");
> +		goto err_subdev_cleanup;
> +	}
> +
> +	pm_runtime_set_active(gc08a3->dev);
> +	pm_runtime_enable(gc08a3->dev);
> +	pm_runtime_idle(gc08a3->dev);

You'll need to enable runtime PM before registering the sub-device, please
move all these calls before v4l2_async_register_subdev_sensor().

> +
> +	return 0;
> +
> +err_subdev_cleanup:
> +	v4l2_subdev_cleanup(&gc08a3->sd);
> +
> +err_media_entity_cleanup:
> +	media_entity_cleanup(&gc08a3->sd.entity);
> +
> +err_v4l2_ctrl_handler_free:
> +	v4l2_ctrl_handler_free(gc08a3->sd.ctrl_handler);
> +
> +err_power_off:
> +	gc08a3_power_off(gc08a3->dev);
> +
> +	return ret;
> +}
> +
> +static void gc08a3_remove(struct i2c_client *client)
> +{
> +	struct v4l2_subdev *sd = i2c_get_clientdata(client);
> +	struct gc08a3 *gc08a3 = to_gc08a3(sd);
> +
> +	v4l2_async_unregister_subdev(&gc08a3->sd);
> +	v4l2_subdev_cleanup(sd);
> +	media_entity_cleanup(&gc08a3->sd.entity);
> +	v4l2_ctrl_handler_free(&gc08a3->ctrls);
> +
> +	pm_runtime_disable(&client->dev);
> +	if (!pm_runtime_status_suspended(&client->dev))
> +		gc08a3_power_off(gc08a3->dev);
> +	pm_runtime_set_suspended(&client->dev);
> +}
> +
> +static const struct of_device_id gc08a3_of_match[] = {
> +	{ .compatible = "galaxycore,gc08a3" },
> +	{}
> +};
> +MODULE_DEVICE_TABLE(of, gc08a3_of_match);
> +
> +static const struct dev_pm_ops gc08a3_pm_ops = {
> +	SET_RUNTIME_PM_OPS(gc08a3_power_off, gc08a3_power_on, NULL)
> +};
> +
> +static struct i2c_driver gc08a3_i2c_driver = {
> +	.driver = {
> +		.of_match_table = gc08a3_of_match,
> +		.pm = &gc08a3_pm_ops,
> +		.name  = "gc08a3",
> +	},
> +	.probe  = gc08a3_probe,
> +	.remove = gc08a3_remove,
> +};
> +
> +module_i2c_driver(gc08a3_i2c_driver);
> +
> +MODULE_DESCRIPTION("GalaxyCore gc08a3 Camera driver");
> +MODULE_AUTHOR("Zhi Mao <zhi.mao@mediatek.com>");
> +MODULE_LICENSE("GPL");

-- 
Regards,

Sakari Ailus