Re: [PATCH 2/2] media: i2c: imx519: Support for the Sony IMX519 sensor

[Sakari Ailus]

Hi Umang,

Thank you for the patchset. Please see my comments below.

On Thu, Jul 27, 2023 at 09:11:08PM +0530, Umang Jain wrote:
> From: Lee Jackson <lee.jackson@xxxxxxxxxxx>
> 
> Adds a driver for the 16MPix IMX519 CSI2 sensor.
> Whilst the sensor supports 2 or 4 CSI2 data lanes, this driver
> currently only supports 2 lanes. The driver also supports
> Phase Detection Auto Focus (PDAF).
> 
> The following Bayer modes are currently available:
> 
> 4656x3496 10-bit @ 10fps
> 3840x2160 10-bit (cropped) @ 21fps
> 2328x1748 10-bit (binned) @ 30fps
> 1920x1080 10-bit (cropped/binned) @ 60fps
> 1280x720 10-bit (cropped/binned) @ 120fps
> 
> The imx519 driver to adverise support for embedded data streams.
> The imx519 sensor subdevice overloads the media pad to differentiate
> between image stream (pad 0) and embedded data stream (pad 1) when
> performing the v4l2_subdev_pad_ops functions.
> 
> Signed-off-by: Umang Jain <umang.jain@xxxxxxxxxxxxxxxx>
> Tested-by: Umang Jain <umang.jain@xxxxxxxxxxxxxxxx>
> ---
>  MAINTAINERS                |    8 +
>  drivers/media/i2c/Kconfig  |   11 +
>  drivers/media/i2c/Makefile |    1 +
>  drivers/media/i2c/imx519.c | 2134 ++++++++++++++++++++++++++++++++++++
>  4 files changed, 2154 insertions(+)
>  create mode 100644 drivers/media/i2c/imx519.c
> 
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 63c7ce10a4ba..e5a33733f928 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -19747,6 +19747,14 @@ T:	git git://linuxtv.org/media_tree.git
>  F:	Documentation/devicetree/bindings/media/i2c/sony,imx415.yaml
>  F:	drivers/media/i2c/imx415.c
>  
> +SONY IMX519 SENSOR DRIVER
> +M:	Lee Jackson <lee.jackson@xxxxxxxxxxx>
> +L:	linux-media@xxxxxxxxxxxxxxx
> +S:	Maintained
> +T:	git git://linuxtv.org/media_tree.git
> +F:	Documentation/devicetree/bindings/media/i2c/sony,imx519.yaml
> +F:	drivers/media/i2c/imx519.c
> +
>  SONY MEMORYSTICK SUBSYSTEM
>  M:	Maxim Levitsky <maximlevitsky@xxxxxxxxx>
>  M:	Alex Dubov <oakad@xxxxxxxxx>
> diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
> index 256d55bb2b1d..ebc2c7c42c53 100644
> --- a/drivers/media/i2c/Kconfig
> +++ b/drivers/media/i2c/Kconfig
> @@ -255,6 +255,17 @@ config VIDEO_IMX415
>  	  To compile this driver as a module, choose M here: the
>  	  module will be called imx415.
>  
> +config VIDEO_IMX519
> +	tristate "Arducam IMX519 sensor support"
> +	depends on I2C && VIDEO_DEV
> +	select VIDEO_V4L2_SUBDEV_API
> +	help
> +	  This is a Video4Linux2 sensor driver for the Arducam
> +	  IMX519 camera.
> +
> +	  To compile this driver as a module, choose M here: the
> +	  module will be called IMX519.
> +
>  config VIDEO_MAX9271_LIB
>  	tristate
>  
> diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
> index b44dacf935f4..872b98e5443f 100644
> --- a/drivers/media/i2c/Makefile
> +++ b/drivers/media/i2c/Makefile
> @@ -49,6 +49,7 @@ obj-$(CONFIG_VIDEO_IMX335) += imx335.o
>  obj-$(CONFIG_VIDEO_IMX355) += imx355.o
>  obj-$(CONFIG_VIDEO_IMX412) += imx412.o
>  obj-$(CONFIG_VIDEO_IMX415) += imx415.o
> +obj-$(CONFIG_VIDEO_IMX519) += imx519.o
>  obj-$(CONFIG_VIDEO_IR_I2C) += ir-kbd-i2c.o
>  obj-$(CONFIG_VIDEO_ISL7998X) += isl7998x.o
>  obj-$(CONFIG_VIDEO_KS0127) += ks0127.o
> diff --git a/drivers/media/i2c/imx519.c b/drivers/media/i2c/imx519.c
> new file mode 100644
> index 000000000000..54420b7738f1
> --- /dev/null
> +++ b/drivers/media/i2c/imx519.c
> @@ -0,0 +1,2134 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * A V4L2 driver for Sony IMX519 cameras.
> + * Copyright (C) 2023 Arducam Technology co., Ltd.
> + *
> + */
> +#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/of_device.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/regulator/consumer.h>
> +#include <media/v4l2-ctrls.h>
> +#include <media/v4l2-device.h>
> +#include <media/v4l2-event.h>
> +#include <media/v4l2-fwnode.h>
> +#include <media/v4l2-mediabus.h>
> +
> +#define IMX519_REG_VALUE_08BIT		1
> +#define IMX519_REG_VALUE_16BIT		2
> +
> +/* Chip ID */
> +#define IMX519_REG_CHIP_ID		0x0016
> +#define IMX519_CHIP_ID			0x0519
> +
> +#define IMX519_REG_MODE_SELECT		0x0100
> +#define IMX519_MODE_STANDBY		0x00
> +#define IMX519_MODE_STREAMING		0x01
> +
> +#define IMX519_REG_ORIENTATION		0x101
> +
> +#define IMX519_XCLK_FREQ		24000000
> +
> +#define IMX519_DEFAULT_LINK_FREQ	408000000
> +
> +/* Pixel rate is fixed at 426MHz for all the modes */
> +#define IMX519_PIXEL_RATE		426666667
> +
> +/* V_TIMING internal */
> +#define IMX519_REG_FRAME_LENGTH		0x0340
> +#define IMX519_FRAME_LENGTH_MAX		0xffdc
> +
> +/* Long exposure multiplier */
> +#define IMX519_LONG_EXP_SHIFT_MAX	7
> +#define IMX519_LONG_EXP_SHIFT_REG	0x3100
> +
> +/* Exposure control */
> +#define IMX519_REG_EXPOSURE		0x0202
> +#define IMX519_EXPOSURE_OFFSET		32
> +#define IMX519_EXPOSURE_MIN		20
> +#define IMX519_EXPOSURE_STEP		1
> +#define IMX519_EXPOSURE_DEFAULT		0x3e8
> +#define IMX519_EXPOSURE_MAX		(IMX519_FRAME_LENGTH_MAX - \
> +					 IMX519_EXPOSURE_OFFSET)
> +
> +/* Analog gain control */
> +#define IMX519_REG_ANALOG_GAIN		0x0204
> +#define IMX519_ANA_GAIN_MIN		0
> +#define IMX519_ANA_GAIN_MAX		960
> +#define IMX519_ANA_GAIN_STEP		1
> +#define IMX519_ANA_GAIN_DEFAULT		0x0
> +
> +/* Digital gain control */
> +#define IMX519_REG_DIGITAL_GAIN		0x020e
> +#define IMX519_DGTL_GAIN_MIN		0x0100
> +#define IMX519_DGTL_GAIN_MAX		0xffff
> +#define IMX519_DGTL_GAIN_DEFAULT	0x0100
> +#define IMX519_DGTL_GAIN_STEP		1
> +
> +/* Test Pattern Control */
> +#define IMX519_REG_TEST_PATTERN		0x0600
> +#define IMX519_TEST_PATTERN_DISABLE	0
> +#define IMX519_TEST_PATTERN_SOLID_COLOR	1
> +#define IMX519_TEST_PATTERN_COLOR_BARS	2
> +#define IMX519_TEST_PATTERN_GREY_COLOR	3
> +#define IMX519_TEST_PATTERN_PN9		4
> +
> +/* Test pattern colour components */
> +#define IMX519_REG_TEST_PATTERN_R	0x0602
> +#define IMX519_REG_TEST_PATTERN_GR	0x0604
> +#define IMX519_REG_TEST_PATTERN_B	0x0606
> +#define IMX519_REG_TEST_PATTERN_GB	0x0608
> +#define IMX519_TEST_PATTERN_COLOUR_MIN	0
> +#define IMX519_TEST_PATTERN_COLOUR_MAX	0x0fff
> +#define IMX519_TEST_PATTERN_COLOUR_STEP	1
> +#define IMX519_TEST_PATTERN_R_DEFAULT	IMX519_TEST_PATTERN_COLOUR_MAX
> +#define IMX519_TEST_PATTERN_GR_DEFAULT	0
> +#define IMX519_TEST_PATTERN_B_DEFAULT	0
> +#define IMX519_TEST_PATTERN_GB_DEFAULT	0
> +
> +/* Embedded metadata stream structure */
> +#define IMX519_EMBEDDED_LINE_WIDTH	(5820 * 3)
> +#define IMX519_NUM_EMBEDDED_LINES	1
> +
> +/* IMX519 native and active pixel array size. */
> +#define IMX519_NATIVE_WIDTH		4672U
> +#define IMX519_NATIVE_HEIGHT		3648U
> +#define IMX519_PIXEL_ARRAY_LEFT		8U
> +#define IMX519_PIXEL_ARRAY_TOP		48U
> +#define IMX519_PIXEL_ARRAY_WIDTH	4656U
> +#define IMX519_PIXEL_ARRAY_HEIGHT	3496U
> +
> +enum pad_types {
> +	IMAGE_PAD,
> +	METADATA_PAD,

With streams, you only need one pad. (See that imx390 driver for an
example (below).)

> +	NUM_PADS
> +};
> +
> +struct imx519_reg {
> +	u16 address;
> +	u8 val;
> +};
> +
> +struct imx519_reg_list {
> +	unsigned int num_of_regs;
> +	const struct imx519_reg *regs;
> +};
> +
> +/* Mode : resolution and related config&values */
> +struct imx519_mode {
> +	/* Frame width */
> +	unsigned int width;
> +
> +	/* Frame height */
> +	unsigned int height;
> +
> +	/* H-timing in pixels */
> +	unsigned int line_length_pix;
> +
> +	/* Analog crop rectangle. */
> +	struct v4l2_rect crop;
> +
> +	/* Highest possible framerate. */
> +	struct v4l2_fract timeperframe_min;
> +
> +	/* Default framerate. */
> +	struct v4l2_fract timeperframe_default;
> +
> +	/* Default register values */
> +	struct imx519_reg_list reg_list;
> +};
> +
> +static const struct imx519_reg mode_common_regs[] = {
> +	{0x0100, 0x00},
> +	{0x0136, 0x18},
> +	{0x0137, 0x00},
> +	{0x3c7e, 0x01},
> +	{0x3c7f, 0x07},
> +	{0x3020, 0x00},
> +	{0x3e35, 0x01},
> +	{0x3f7f, 0x01},
> +	{0x5609, 0x57},
> +	{0x5613, 0x51},
> +	{0x561f, 0x5e},
> +	{0x5623, 0xd2},
> +	{0x5637, 0x11},
> +	{0x5657, 0x11},
> +	{0x5659, 0x12},
> +	{0x5733, 0x60},
> +	{0x5905, 0x57},
> +	{0x590f, 0x51},
> +	{0x591b, 0x5e},
> +	{0x591f, 0xd2},
> +	{0x5933, 0x11},
> +	{0x5953, 0x11},
> +	{0x5955, 0x12},
> +	{0x5a2f, 0x60},
> +	{0x5a85, 0x57},
> +	{0x5a8f, 0x51},
> +	{0x5a9b, 0x5e},
> +	{0x5a9f, 0xd2},
> +	{0x5ab3, 0x11},
> +	{0x5ad3, 0x11},
> +	{0x5ad5, 0x12},
> +	{0x5baf, 0x60},
> +	{0x5c15, 0x2a},
> +	{0x5c17, 0x80},
> +	{0x5c19, 0x31},
> +	{0x5c1b, 0x87},
> +	{0x5c25, 0x25},
> +	{0x5c27, 0x7b},
> +	{0x5c29, 0x2a},
> +	{0x5c2b, 0x80},
> +	{0x5c2d, 0x31},
> +	{0x5c2f, 0x87},
> +	{0x5c35, 0x2b},
> +	{0x5c37, 0x81},
> +	{0x5c39, 0x31},
> +	{0x5c3b, 0x87},
> +	{0x5c45, 0x25},
> +	{0x5c47, 0x7b},
> +	{0x5c49, 0x2a},
> +	{0x5c4b, 0x80},
> +	{0x5c4d, 0x31},
> +	{0x5c4f, 0x87},
> +	{0x5c55, 0x2d},
> +	{0x5c57, 0x83},
> +	{0x5c59, 0x32},
> +	{0x5c5b, 0x88},
> +	{0x5c65, 0x29},
> +	{0x5c67, 0x7f},
> +	{0x5c69, 0x2e},
> +	{0x5c6b, 0x84},
> +	{0x5c6d, 0x32},
> +	{0x5c6f, 0x88},
> +	{0x5e69, 0x04},
> +	{0x5e9d, 0x00},
> +	{0x5f18, 0x10},
> +	{0x5f1a, 0x0e},
> +	{0x5f20, 0x12},
> +	{0x5f22, 0x10},
> +	{0x5f24, 0x0e},
> +	{0x5f28, 0x10},
> +	{0x5f2a, 0x0e},
> +	{0x5f30, 0x12},
> +	{0x5f32, 0x10},
> +	{0x5f34, 0x0e},
> +	{0x5f38, 0x0f},
> +	{0x5f39, 0x0d},
> +	{0x5f3c, 0x11},
> +	{0x5f3d, 0x0f},
> +	{0x5f3e, 0x0d},
> +	{0x5f61, 0x07},
> +	{0x5f64, 0x05},
> +	{0x5f67, 0x03},
> +	{0x5f6a, 0x03},
> +	{0x5f6d, 0x07},
> +	{0x5f70, 0x07},
> +	{0x5f73, 0x05},
> +	{0x5f76, 0x02},
> +	{0x5f79, 0x07},
> +	{0x5f7c, 0x07},
> +	{0x5f7f, 0x07},
> +	{0x5f82, 0x07},
> +	{0x5f85, 0x03},
> +	{0x5f88, 0x02},
> +	{0x5f8b, 0x01},
> +	{0x5f8e, 0x01},
> +	{0x5f91, 0x04},
> +	{0x5f94, 0x05},
> +	{0x5f97, 0x02},
> +	{0x5f9d, 0x07},
> +	{0x5fa0, 0x07},
> +	{0x5fa3, 0x07},
> +	{0x5fa6, 0x07},
> +	{0x5fa9, 0x03},
> +	{0x5fac, 0x01},
> +	{0x5faf, 0x01},
> +	{0x5fb5, 0x03},
> +	{0x5fb8, 0x02},
> +	{0x5fbb, 0x01},
> +	{0x5fc1, 0x07},
> +	{0x5fc4, 0x07},
> +	{0x5fc7, 0x07},
> +	{0x5fd1, 0x00},
> +	{0x6302, 0x79},
> +	{0x6305, 0x78},
> +	{0x6306, 0xa5},
> +	{0x6308, 0x03},
> +	{0x6309, 0x20},
> +	{0x630b, 0x0a},
> +	{0x630d, 0x48},
> +	{0x630f, 0x06},
> +	{0x6311, 0xa4},
> +	{0x6313, 0x03},
> +	{0x6314, 0x20},
> +	{0x6316, 0x0a},
> +	{0x6317, 0x31},
> +	{0x6318, 0x4a},
> +	{0x631a, 0x06},
> +	{0x631b, 0x40},
> +	{0x631c, 0xa4},
> +	{0x631e, 0x03},
> +	{0x631f, 0x20},
> +	{0x6321, 0x0a},
> +	{0x6323, 0x4a},
> +	{0x6328, 0x80},
> +	{0x6329, 0x01},
> +	{0x632a, 0x30},
> +	{0x632b, 0x02},
> +	{0x632c, 0x20},
> +	{0x632d, 0x02},
> +	{0x632e, 0x30},
> +	{0x6330, 0x60},
> +	{0x6332, 0x90},
> +	{0x6333, 0x01},
> +	{0x6334, 0x30},
> +	{0x6335, 0x02},
> +	{0x6336, 0x20},
> +	{0x6338, 0x80},
> +	{0x633a, 0xa0},
> +	{0x633b, 0x01},
> +	{0x633c, 0x60},
> +	{0x633d, 0x02},
> +	{0x633e, 0x60},
> +	{0x633f, 0x01},
> +	{0x6340, 0x30},
> +	{0x6341, 0x02},
> +	{0x6342, 0x20},
> +	{0x6343, 0x03},
> +	{0x6344, 0x80},
> +	{0x6345, 0x03},
> +	{0x6346, 0x90},
> +	{0x6348, 0xf0},
> +	{0x6349, 0x01},
> +	{0x634a, 0x20},
> +	{0x634b, 0x02},
> +	{0x634c, 0x10},
> +	{0x634d, 0x03},
> +	{0x634e, 0x60},
> +	{0x6350, 0xa0},
> +	{0x6351, 0x01},
> +	{0x6352, 0x60},
> +	{0x6353, 0x02},
> +	{0x6354, 0x50},
> +	{0x6355, 0x02},
> +	{0x6356, 0x60},
> +	{0x6357, 0x01},
> +	{0x6358, 0x30},
> +	{0x6359, 0x02},
> +	{0x635a, 0x30},
> +	{0x635b, 0x03},
> +	{0x635c, 0x90},
> +	{0x635f, 0x01},
> +	{0x6360, 0x10},
> +	{0x6361, 0x01},
> +	{0x6362, 0x40},
> +	{0x6363, 0x02},
> +	{0x6364, 0x50},
> +	{0x6368, 0x70},
> +	{0x636a, 0xa0},
> +	{0x636b, 0x01},
> +	{0x636c, 0x50},
> +	{0x637d, 0xe4},
> +	{0x637e, 0xb4},
> +	{0x638c, 0x8e},
> +	{0x638d, 0x38},
> +	{0x638e, 0xe3},
> +	{0x638f, 0x4c},
> +	{0x6390, 0x30},
> +	{0x6391, 0xc3},
> +	{0x6392, 0xae},
> +	{0x6393, 0xba},
> +	{0x6394, 0xeb},
> +	{0x6395, 0x6e},
> +	{0x6396, 0x34},
> +	{0x6397, 0xe3},
> +	{0x6398, 0xcf},
> +	{0x6399, 0x3c},
> +	{0x639a, 0xf3},
> +	{0x639b, 0x0c},
> +	{0x639c, 0x30},
> +	{0x639d, 0xc1},
> +	{0x63b9, 0xa3},
> +	{0x63ba, 0xfe},
> +	{0x7600, 0x01},
> +	{0x79a0, 0x01},
> +	{0x79a1, 0x01},
> +	{0x79a2, 0x01},
> +	{0x79a3, 0x01},
> +	{0x79a4, 0x01},
> +	{0x79a5, 0x20},
> +	{0x79a9, 0x00},
> +	{0x79aa, 0x01},
> +	{0x79ad, 0x00},
> +	{0x79af, 0x00},
> +	{0x8173, 0x01},
> +	{0x835c, 0x01},
> +	{0x8a74, 0x01},
> +	{0x8c1f, 0x00},
> +	{0x8c27, 0x00},
> +	{0x8c3b, 0x03},
> +	{0x9004, 0x0b},
> +	{0x920c, 0x6a},
> +	{0x920d, 0x22},
> +	{0x920e, 0x6a},
> +	{0x920f, 0x23},
> +	{0x9214, 0x6a},
> +	{0x9215, 0x20},
> +	{0x9216, 0x6a},
> +	{0x9217, 0x21},
> +	{0x9385, 0x3e},
> +	{0x9387, 0x1b},
> +	{0x938d, 0x4d},
> +	{0x938f, 0x43},
> +	{0x9391, 0x1b},
> +	{0x9395, 0x4d},
> +	{0x9397, 0x43},
> +	{0x9399, 0x1b},
> +	{0x939d, 0x3e},
> +	{0x939f, 0x2f},
> +	{0x93a5, 0x43},
> +	{0x93a7, 0x2f},
> +	{0x93a9, 0x2f},
> +	{0x93ad, 0x34},
> +	{0x93af, 0x2f},
> +	{0x93b5, 0x3e},
> +	{0x93b7, 0x2f},
> +	{0x93bd, 0x4d},
> +	{0x93bf, 0x43},
> +	{0x93c1, 0x2f},
> +	{0x93c5, 0x4d},
> +	{0x93c7, 0x43},
> +	{0x93c9, 0x2f},
> +	{0x974b, 0x02},
> +	{0x995c, 0x8c},
> +	{0x995d, 0x00},
> +	{0x995e, 0x00},
> +	{0x9963, 0x64},
> +	{0x9964, 0x50},
> +	{0xaa0a, 0x26},
> +	{0xae03, 0x04},
> +	{0xae04, 0x03},
> +	{0xae05, 0x03},
> +	{0xbc1c, 0x08},
> +	{0xbcf1, 0x02},
> +	{0x38a3, 0x00},
> +};
> +
> +/* 16 mpix 10fps */
> +static const struct imx519_reg mode_4656x3496_regs[] = {
> +	{0x0111, 0x02},
> +	{0x0112, 0x0a},
> +	{0x0113, 0x0a},
> +	{0x0114, 0x01},
> +	{0x0342, 0x31},
> +	{0x0343, 0x6a},
> +	{0x0340, 0x0d},
> +	{0x0341, 0xf4},
> +	{0x0344, 0x00},
> +	{0x0345, 0x00},
> +	{0x0346, 0x00},
> +	{0x0347, 0x00},
> +	{0x0348, 0x12},
> +	{0x0349, 0x2f},
> +	{0x034a, 0x0d},
> +	{0x034b, 0xa7},
> +	{0x0220, 0x00},
> +	{0x0221, 0x11},
> +	{0x0222, 0x01},
> +	{0x0900, 0x00},
> +	{0x0901, 0x11},
> +	{0x0902, 0x0a},
> +	{0x3f4c, 0x01},
> +	{0x3f4d, 0x01},
> +	{0x4254, 0x7f},
> +	{0x0401, 0x00},
> +	{0x0404, 0x00},
> +	{0x0405, 0x10},
> +	{0x0408, 0x00},
> +	{0x0409, 0x00},
> +	{0x040a, 0x00},
> +	{0x040b, 0x00},
> +	{0x040c, 0x12},
> +	{0x040d, 0x30},
> +	{0x040e, 0x0d},
> +	{0x040f, 0xa8},
> +	{0x034c, 0x12},
> +	{0x034d, 0x30},
> +	{0x034e, 0x0d},
> +	{0x034f, 0xa8},
> +	{0x0301, 0x06},
> +	{0x0303, 0x04},
> +	{0x0305, 0x06},
> +	{0x0306, 0x01},
> +	{0x0307, 0x40},
> +	{0x0309, 0x0a},
> +	{0x030b, 0x02},
> +	{0x030d, 0x04},
> +	{0x030e, 0x01},
> +	{0x030f, 0x10},
> +	{0x0310, 0x01},
> +	{0x0820, 0x0a},
> +	{0x0821, 0x20},
> +	{0x0822, 0x00},
> +	{0x0823, 0x00},
> +	{0x3e20, 0x01},
> +	{0x3e37, 0x01},
> +	{0x3e3b, 0x00},
> +	{0x38a4, 0x00},
> +	{0x38a5, 0x00},
> +	{0x38a6, 0x00},
> +	{0x38a7, 0x00},
> +	{0x38a8, 0x01},
> +	{0x38a9, 0x23},
> +	{0x38aa, 0x01},
> +	{0x38ab, 0x23},
> +	{0x0106, 0x00},
> +	{0x0b00, 0x00},
> +	{0x3230, 0x00},
> +	{0x3f14, 0x01},
> +	{0x3f3c, 0x01},
> +	{0x3f0d, 0x0a},
> +	{0x3fbc, 0x00},
> +	{0x3c06, 0x00},
> +	{0x3c07, 0x48},
> +	{0x3c0a, 0x00},
> +	{0x3c0b, 0x00},
> +	{0x3f78, 0x00},
> +	{0x3f79, 0x40},
> +	{0x3f7c, 0x00},
> +	{0x3f7d, 0x00},
> +};
> +
> +/* 4k 21fps mode */
> +static const struct imx519_reg mode_3840x2160_regs[] = {
> +	{0x0111, 0x02},
> +	{0x0112, 0x0a},
> +	{0x0113, 0x0a},
> +	{0x0114, 0x01},
> +	{0x0342, 0x28},
> +	{0x0343, 0xf6},
> +	{0x0340, 0x08},
> +	{0x0341, 0xd4},
> +	{0x0344, 0x01},
> +	{0x0345, 0x98},
> +	{0x0346, 0x02},
> +	{0x0347, 0xa0},
> +	{0x0348, 0x10},
> +	{0x0349, 0x97},
> +	{0x034a, 0x0b},
> +	{0x034b, 0x17},
> +	{0x0220, 0x00},
> +	{0x0221, 0x11},
> +	{0x0222, 0x01},
> +	{0x0900, 0x00},
> +	{0x0901, 0x11},
> +	{0x0902, 0x0a},
> +	{0x3f4c, 0x01},
> +	{0x3f4d, 0x01},
> +	{0x4254, 0x7f},
> +	{0x0401, 0x00},
> +	{0x0404, 0x00},
> +	{0x0405, 0x10},
> +	{0x0408, 0x00},
> +	{0x0409, 0x00},
> +	{0x040a, 0x00},
> +	{0x040b, 0x00},
> +	{0x040c, 0x0f},
> +	{0x040d, 0x00},
> +	{0x040e, 0x08},
> +	{0x040f, 0x70},
> +	{0x034c, 0x0f},
> +	{0x034d, 0x00},
> +	{0x034e, 0x08},
> +	{0x034f, 0x70},
> +	{0x0301, 0x06},
> +	{0x0303, 0x04},
> +	{0x0305, 0x06},
> +	{0x0306, 0x01},
> +	{0x0307, 0x40},
> +	{0x0309, 0x0a},
> +	{0x030b, 0x02},
> +	{0x030d, 0x04},
> +	{0x030e, 0x01},
> +	{0x030f, 0x10},
> +	{0x0310, 0x01},
> +	{0x0820, 0x0a},
> +	{0x0821, 0x20},
> +	{0x0822, 0x00},
> +	{0x0823, 0x00},
> +	{0x3e20, 0x01},
> +	{0x3e37, 0x01},
> +	{0x3e3b, 0x00},
> +	{0x38a4, 0x00},
> +	{0x38a5, 0x00},
> +	{0x38a6, 0x00},
> +	{0x38a7, 0x00},
> +	{0x38a8, 0x00},
> +	{0x38a9, 0xf0},
> +	{0x38aa, 0x00},
> +	{0x38ab, 0xb4},
> +	{0x0106, 0x00},
> +	{0x0b00, 0x00},
> +	{0x3230, 0x00},
> +	{0x3f14, 0x01},
> +	{0x3f3c, 0x01},
> +	{0x3f0d, 0x0a},
> +	{0x3fbc, 0x00},
> +	{0x3c06, 0x00},
> +	{0x3c07, 0x48},
> +	{0x3c0a, 0x00},
> +	{0x3c0b, 0x00},
> +	{0x3f78, 0x00},
> +	{0x3f79, 0x40},
> +	{0x3f7c, 0x00},
> +	{0x3f7d, 0x00},
> +};
> +
> +/* 2x2 binned 30fps mode */
> +static const struct imx519_reg mode_2328x1748_regs[] = {
> +	{0x0111, 0x02},
> +	{0x0112, 0x0a},
> +	{0x0113, 0x0a},
> +	{0x0114, 0x01},
> +	{0x0342, 0x19},
> +	{0x0343, 0x70},
> +	{0x0340, 0x08},
> +	{0x0341, 0x88},
> +	{0x0344, 0x00},
> +	{0x0345, 0x00},
> +	{0x0346, 0x00},
> +	{0x0347, 0x00},
> +	{0x0348, 0x12},
> +	{0x0349, 0x2f},
> +	{0x034a, 0x0d},
> +	{0x034b, 0xa7},
> +	{0x0220, 0x00},
> +	{0x0221, 0x11},
> +	{0x0222, 0x01},
> +	{0x0900, 0x01},
> +	{0x0901, 0x22},
> +	{0x0902, 0x0a},
> +	{0x3f4c, 0x05},
> +	{0x3f4d, 0x03},
> +	{0x4254, 0x7f},
> +	{0x0401, 0x00},
> +	{0x0404, 0x00},
> +	{0x0405, 0x10},
> +	{0x0408, 0x00},
> +	{0x0409, 0x00},
> +	{0x040a, 0x00},
> +	{0x040b, 0x00},
> +	{0x040c, 0x09},
> +	{0x040d, 0x18},
> +	{0x040e, 0x06},
> +	{0x040f, 0xd4},
> +	{0x034c, 0x09},
> +	{0x034d, 0x18},
> +	{0x034e, 0x06},
> +	{0x034f, 0xd4},
> +	{0x0301, 0x06},
> +	{0x0303, 0x04},
> +	{0x0305, 0x06},
> +	{0x0306, 0x01},
> +	{0x0307, 0x40},
> +	{0x0309, 0x0a},
> +	{0x030b, 0x02},
> +	{0x030d, 0x04},
> +	{0x030e, 0x01},
> +	{0x030f, 0x10},
> +	{0x0310, 0x01},
> +	{0x0820, 0x0a},
> +	{0x0821, 0x20},
> +	{0x0822, 0x00},
> +	{0x0823, 0x00},
> +	{0x3e20, 0x01},
> +	{0x3e37, 0x01},
> +	{0x3e3b, 0x00},
> +	{0x38a4, 0x00},
> +	{0x38a5, 0x00},
> +	{0x38a6, 0x00},
> +	{0x38a7, 0x00},
> +	{0x38a8, 0x00},
> +	{0x38a9, 0x91},
> +	{0x38aa, 0x00},
> +	{0x38ab, 0x91},
> +	{0x0106, 0x00},
> +	{0x0b00, 0x00},
> +	{0x3230, 0x00},
> +	{0x3f14, 0x01},
> +	{0x3f3c, 0x01},
> +	{0x3f0d, 0x0a},
> +	{0x3fbc, 0x00},
> +	{0x3c06, 0x00},
> +	{0x3c07, 0x48},
> +	{0x3c0a, 0x00},
> +	{0x3c0b, 0x00},
> +	{0x3f78, 0x00},
> +	{0x3f79, 0x40},
> +	{0x3f7c, 0x00},
> +	{0x3f7d, 0x00},
> +};
> +
> +/* 1080p 60fps mode */
> +static const struct imx519_reg mode_1920x1080_regs[] = {
> +	{0x0111, 0x02},
> +	{0x0112, 0x0a},
> +	{0x0113, 0x0a},
> +	{0x0114, 0x01},
> +	{0x0342, 0x17},
> +	{0x0343, 0x8b},
> +	{0x0340, 0x04},
> +	{0x0341, 0x9c},
> +	{0x0344, 0x01},
> +	{0x0345, 0x98},
> +	{0x0346, 0x02},
> +	{0x0347, 0xa2},
> +	{0x0348, 0x10},
> +	{0x0349, 0x97},
> +	{0x034a, 0x0b},
> +	{0x034b, 0x15},
> +	{0x0220, 0x00},
> +	{0x0221, 0x11},
> +	{0x0222, 0x01},
> +	{0x0900, 0x01},
> +	{0x0901, 0x22},
> +	{0x0902, 0x0a},
> +	{0x3f4c, 0x05},
> +	{0x3f4d, 0x03},
> +	{0x4254, 0x7f},
> +	{0x0401, 0x00},
> +	{0x0404, 0x00},
> +	{0x0405, 0x10},
> +	{0x0408, 0x00},
> +	{0x0409, 0x00},
> +	{0x040a, 0x00},
> +	{0x040b, 0x00},
> +	{0x040c, 0x07},
> +	{0x040d, 0x80},
> +	{0x040e, 0x04},
> +	{0x040f, 0x38},
> +	{0x034c, 0x07},
> +	{0x034d, 0x80},
> +	{0x034e, 0x04},
> +	{0x034f, 0x38},
> +	{0x0301, 0x06},
> +	{0x0303, 0x04},
> +	{0x0305, 0x06},
> +	{0x0306, 0x01},
> +	{0x0307, 0x40},
> +	{0x0309, 0x0a},
> +	{0x030b, 0x02},
> +	{0x030d, 0x04},
> +	{0x030e, 0x01},
> +	{0x030f, 0x10},
> +	{0x0310, 0x01},
> +	{0x0820, 0x0a},
> +	{0x0821, 0x20},
> +	{0x0822, 0x00},
> +	{0x0823, 0x00},
> +	{0x3e20, 0x01},
> +	{0x3e37, 0x01},
> +	{0x3e3b, 0x00},
> +	{0x38a4, 0x00},
> +	{0x38a5, 0x00},
> +	{0x38a6, 0x00},
> +	{0x38a7, 0x00},
> +	{0x38a8, 0x00},
> +	{0x38a9, 0x78},
> +	{0x38aa, 0x00},
> +	{0x38ab, 0x5a},
> +	{0x0106, 0x00},
> +	{0x0b00, 0x00},
> +	{0x3230, 0x00},
> +	{0x3f14, 0x01},
> +	{0x3f3c, 0x01},
> +	{0x3f0d, 0x0a},
> +	{0x3fbc, 0x00},
> +	{0x3c06, 0x00},
> +	{0x3c07, 0x48},
> +	{0x3c0a, 0x00},
> +	{0x3c0b, 0x00},
> +	{0x3f78, 0x00},
> +	{0x3f79, 0x40},
> +	{0x3f7c, 0x00},
> +	{0x3f7d, 0x00},
> +};
> +
> +/* 720p 120fps mode */
> +static const struct imx519_reg mode_1280x720_regs[] = {
> +	{0x0111, 0x02},
> +	{0x0112, 0x0a},
> +	{0x0113, 0x0a},
> +	{0x0114, 0x01},
> +	{0x0342, 0x18},
> +	{0x0343, 0x00},
> +	{0x0340, 0x03},
> +	{0x0341, 0x34},
> +	{0x0344, 0x04},
> +	{0x0345, 0x18},
> +	{0x0346, 0x04},
> +	{0x0347, 0x12},
> +	{0x0348, 0x0e},
> +	{0x0349, 0x17},
> +	{0x034a, 0x09},
> +	{0x034b, 0xb6},
> +	{0x0220, 0x00},
> +	{0x0221, 0x11},
> +	{0x0222, 0x01},
> +	{0x0900, 0x01},
> +	{0x0901, 0x22},
> +	{0x0902, 0x0a},
> +	{0x3f4c, 0x05},
> +	{0x3f4d, 0x03},
> +	{0x4254, 0x7f},
> +	{0x0401, 0x00},
> +	{0x0404, 0x00},
> +	{0x0405, 0x10},
> +	{0x0408, 0x00},
> +	{0x0409, 0x00},
> +	{0x040a, 0x00},
> +	{0x040b, 0x00},
> +	{0x040c, 0x05},
> +	{0x040d, 0x00},
> +	{0x040e, 0x02},
> +	{0x040f, 0xd0},
> +	{0x034c, 0x05},
> +	{0x034d, 0x00},
> +	{0x034e, 0x02},
> +	{0x034f, 0xd0},
> +	{0x0301, 0x06},
> +	{0x0303, 0x04},
> +	{0x0305, 0x06},
> +	{0x0306, 0x01},
> +	{0x0307, 0x40},
> +	{0x0309, 0x0a},
> +	{0x030b, 0x02},
> +	{0x030d, 0x04},
> +	{0x030e, 0x01},
> +	{0x030f, 0x10},
> +	{0x0310, 0x01},
> +	{0x0820, 0x0a},
> +	{0x0821, 0x20},
> +	{0x0822, 0x00},
> +	{0x0823, 0x00},
> +	{0x3e20, 0x01},
> +	{0x3e37, 0x01},
> +	{0x3e3b, 0x00},
> +	{0x38a4, 0x00},
> +	{0x38a5, 0x00},
> +	{0x38a6, 0x00},
> +	{0x38a7, 0x00},
> +	{0x38a8, 0x00},
> +	{0x38a9, 0x50},
> +	{0x38aa, 0x00},
> +	{0x38ab, 0x3c},
> +	{0x0106, 0x00},
> +	{0x0b00, 0x00},
> +	{0x3230, 0x00},
> +	{0x3f14, 0x01},
> +	{0x3f3c, 0x01},
> +	{0x3f0d, 0x0a},
> +	{0x3fbc, 0x00},
> +	{0x3c06, 0x00},
> +	{0x3c07, 0x48},
> +	{0x3c0a, 0x00},
> +	{0x3c0b, 0x00},
> +	{0x3f78, 0x00},
> +	{0x3f79, 0x40},
> +	{0x3f7c, 0x00},
> +	{0x3f7d, 0x00},
> +};
> +
> +/* Mode configs */
> +static const struct imx519_mode supported_modes_10bit[] = {
> +	{
> +		.width = 4656,
> +		.height = 3496,
> +		.line_length_pix = 0x316a,
> +		.crop = {
> +			.left = IMX519_PIXEL_ARRAY_LEFT,
> +			.top = IMX519_PIXEL_ARRAY_TOP,
> +			.width = 4656,
> +			.height = 3496,
> +		},
> +		.timeperframe_min = {
> +			.numerator = 100,
> +			.denominator = 900
> +		},
> +		.timeperframe_default = {
> +			.numerator = 100,
> +			.denominator = 900
> +		},
> +		.reg_list = {
> +			.num_of_regs = ARRAY_SIZE(mode_4656x3496_regs),
> +			.regs = mode_4656x3496_regs,
> +		}
> +	},
> +	{
> +		.width = 3840,
> +		.height = 2160,
> +		.line_length_pix = 0x28f6,
> +		.crop = {
> +			.left = IMX519_PIXEL_ARRAY_LEFT + 408,
> +			.top = IMX519_PIXEL_ARRAY_TOP + 672,
> +			.width = 3840,
> +			.height = 2160,
> +		},
> +		.timeperframe_min = {
> +			.numerator = 100,
> +			.denominator = 1800
> +		},
> +		.timeperframe_default = {
> +			.numerator = 100,
> +			.denominator = 1800
> +		},
> +		.reg_list = {
> +			.num_of_regs = ARRAY_SIZE(mode_3840x2160_regs),
> +			.regs = mode_3840x2160_regs,
> +		}
> +	},
> +	{
> +		.width = 2328,
> +		.height = 1748,
> +		.line_length_pix = 0x1970,
> +		.crop = {
> +			.left = IMX519_PIXEL_ARRAY_LEFT,
> +			.top = IMX519_PIXEL_ARRAY_TOP,
> +			.width = 4656,
> +			.height = 3496,
> +		},
> +		.timeperframe_min = {
> +			.numerator = 100,
> +			.denominator = 3000
> +		},
> +		.timeperframe_default = {
> +			.numerator = 100,
> +			.denominator = 3000
> +		},
> +		.reg_list = {
> +			.num_of_regs = ARRAY_SIZE(mode_2328x1748_regs),
> +			.regs = mode_2328x1748_regs,
> +		}
> +	},
> +	{
> +		.width = 1920,
> +		.height = 1080,
> +		.line_length_pix = 0x178b,
> +		.crop = {
> +			.left = IMX519_PIXEL_ARRAY_LEFT + 408,
> +			.top = IMX519_PIXEL_ARRAY_TOP + 674,
> +			.width = 3840,
> +			.height = 2160,
> +		},
> +		.timeperframe_min = {
> +			.numerator = 100,
> +			.denominator = 6000
> +		},
> +		.timeperframe_default = {
> +			.numerator = 100,
> +			.denominator = 6000
> +		},
> +		.reg_list = {
> +			.num_of_regs = ARRAY_SIZE(mode_1920x1080_regs),
> +			.regs = mode_1920x1080_regs,
> +		}
> +	},
> +	{
> +		.width = 1280,
> +		.height = 720,
> +		.line_length_pix = 0x1800,
> +		.crop = {
> +			.left = IMX519_PIXEL_ARRAY_LEFT + 1048,
> +			.top = IMX519_PIXEL_ARRAY_TOP + 1042,
> +			.width = 2560,
> +			.height = 1440,
> +		},
> +		.timeperframe_min = {
> +			.numerator = 100,
> +			.denominator = 8000
> +		},
> +		.timeperframe_default = {
> +			.numerator = 100,
> +			.denominator = 8000
> +		},
> +		.reg_list = {
> +			.num_of_regs = ARRAY_SIZE(mode_1280x720_regs),
> +			.regs = mode_1280x720_regs,
> +		}
> +	}
> +};
> +
> +/*
> + * The supported formats.
> + * This table MUST contain 4 entries per format, to cover the various flip
> + * combinations in the order
> + * - no flip
> + * - h flip
> + * - v flip
> + * - h&v flips
> + */
> +static const u32 codes[] = {
> +	/* 10-bit modes. */
> +	MEDIA_BUS_FMT_SRGGB10_1X10,
> +	MEDIA_BUS_FMT_SGRBG10_1X10,
> +	MEDIA_BUS_FMT_SGBRG10_1X10,
> +	MEDIA_BUS_FMT_SBGGR10_1X10,
> +};
> +
> +static const char * const imx519_test_pattern_menu[] = {
> +	"Disabled",
> +	"Color Bars",
> +	"Solid Color",
> +	"Grey Color Bars",
> +	"PN9"
> +};
> +
> +static const int imx519_test_pattern_val[] = {
> +	IMX519_TEST_PATTERN_DISABLE,
> +	IMX519_TEST_PATTERN_COLOR_BARS,
> +	IMX519_TEST_PATTERN_SOLID_COLOR,
> +	IMX519_TEST_PATTERN_GREY_COLOR,
> +	IMX519_TEST_PATTERN_PN9,
> +};
> +
> +/* regulator supplies */
> +static const char * const imx519_supply_name[] = {
> +	/* Supplies can be enabled in any order */
> +	"VANA",  /* Analog (2.8V) supply */
> +	"VDIG",  /* Digital Core (1.05V) supply */
> +	"VDDL",  /* IF (1.8V) supply */
> +};
> +
> +#define IMX519_NUM_SUPPLIES ARRAY_SIZE(imx519_supply_name)

Please use ARRAY_SIZE() directly instead.

> +
> +/*
> + * Initialisation delay between XCLR low->high and the moment when the sensor
> + * can start capture (i.e. can leave software standby), given by T7 in the
> + * datasheet is 8ms.  This does include I2C setup time as well.
> + *
> + * Note, that delay between XCLR low->high and reading the CCI ID register (T6
> + * in the datasheet) is much smaller - 600us.
> + */
> +#define IMX519_XCLR_MIN_DELAY_US	8000
> +#define IMX519_XCLR_DELAY_RANGE_US	1000
> +
> +struct imx519 {
> +	struct v4l2_subdev sd;
> +	struct media_pad pad[NUM_PADS];
> +
> +	unsigned int fmt_code;
> +
> +	struct clk *xclk;
> +
> +	struct gpio_desc *reset_gpio;
> +	struct regulator_bulk_data supplies[IMX519_NUM_SUPPLIES];
> +
> +	struct v4l2_ctrl_handler ctrl_handler;
> +	/* V4L2 Controls */
> +	struct v4l2_ctrl *pixel_rate;
> +	struct v4l2_ctrl *exposure;
> +	struct v4l2_ctrl *vflip;
> +	struct v4l2_ctrl *hflip;
> +	struct v4l2_ctrl *vblank;
> +	struct v4l2_ctrl *hblank;
> +
> +	/* Current mode */
> +	const struct imx519_mode *mode;
> +
> +	/*
> +	 * Mutex for serialized access:
> +	 * Protect sensor module set pad format and start/stop streaming safely.
> +	 */
> +	struct mutex mutex;
> +
> +	/* Streaming on/off */
> +	bool streaming;
> +
> +	/* Rewrite common registers on stream on? */
> +	bool common_regs_written;
> +
> +	/* Current long exposure factor in use. Set through V4L2_CID_VBLANK */
> +	unsigned int long_exp_shift;
> +};
> +
> +static inline struct imx519 *to_imx519(struct v4l2_subdev *_sd)

You could call the argument "sd" as well. Up to you.

> +{
> +	return container_of(_sd, struct imx519, sd);
> +}
> +
> +/* Read registers up to 2 at a time */
> +static int imx519_read_reg(struct imx519 *imx519, u16 reg, u32 len, u32 *val)
> +{
> +	struct i2c_client *client = v4l2_get_subdevdata(&imx519->sd);
> +	struct i2c_msg msgs[2];
> +	u8 addr_buf[2] = { reg >> 8, reg & 0xff };
> +	u8 data_buf[4] = { 0, };
> +	int ret;
> +
> +	if (len > 4)
> +		return -EINVAL;
> +
> +	/* Write register address */
> +	msgs[0].addr = client->addr;
> +	msgs[0].flags = 0;
> +	msgs[0].len = ARRAY_SIZE(addr_buf);
> +	msgs[0].buf = addr_buf;
> +
> +	/* Read data from register */
> +	msgs[1].addr = client->addr;
> +	msgs[1].flags = I2C_M_RD;
> +	msgs[1].len = len;
> +	msgs[1].buf = &data_buf[4 - len];
> +
> +	ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
> +	if (ret != ARRAY_SIZE(msgs))
> +		return -EIO;
> +
> +	*val = get_unaligned_be32(data_buf);
> +
> +	return 0;
> +}
> +
> +/* Write registers up to 2 at a time */
> +static int imx519_write_reg(struct imx519 *imx519, u16 reg, u32 len, u32 val)
> +{
> +	struct i2c_client *client = v4l2_get_subdevdata(&imx519->sd);
> +	u8 buf[6];
> +
> +	if (len > 4)
> +		return -EINVAL;
> +
> +	put_unaligned_be16(reg, buf);
> +	put_unaligned_be32(val << (8 * (4 - len)), buf + 2);
> +	if (i2c_master_send(client, buf, len + 2) != len + 2)
> +		return -EIO;
> +
> +	return 0;
> +}

We have V4L2 CCI helpers, please switch. (See
drivers/media/v4l2-core/v4l2-cci.c .)

> +
> +/* Write a list of registers */
> +static int imx519_write_regs(struct imx519 *imx519,
> +			     const struct imx519_reg *regs, u32 len)
> +{
> +	struct i2c_client *client = v4l2_get_subdevdata(&imx519->sd);
> +	unsigned int i;
> +	int ret;
> +
> +	for (i = 0; i < len; i++) {
> +		ret = imx519_write_reg(imx519, regs[i].address, 1, regs[i].val);
> +		if (ret) {
> +			dev_err_ratelimited(&client->dev,
> +					    "Failed to write reg 0x%4.4x. error = %d\n",
> +					    regs[i].address, ret);
> +
> +			return ret;
> +		}
> +	}
> +
> +	return 0;
> +}
> +
> +/* Get bayer order based on flip setting. */
> +static u32 imx519_get_format_code(struct imx519 *imx519)
> +{
> +	unsigned int i;
> +
> +	lockdep_assert_held(&imx519->mutex);
> +
> +	i = (imx519->vflip->val ? 2 : 0) |
> +	    (imx519->hflip->val ? 1 : 0);
> +
> +	return codes[i];
> +}
> +
> +static int imx519_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
> +{
> +	struct imx519 *imx519 = to_imx519(sd);
> +	struct v4l2_mbus_framefmt *try_fmt_img =
> +		v4l2_subdev_get_try_format(sd, fh->state, IMAGE_PAD);
> +	struct v4l2_mbus_framefmt *try_fmt_meta =
> +		v4l2_subdev_get_try_format(sd, fh->state, METADATA_PAD);
> +	struct v4l2_rect *try_crop;
> +
> +	mutex_lock(&imx519->mutex);
> +
> +	/* Initialize try_fmt for the image pad */
> +	try_fmt_img->width = supported_modes_10bit[0].width;
> +	try_fmt_img->height = supported_modes_10bit[0].height;
> +	try_fmt_img->code = imx519_get_format_code(imx519);
> +	try_fmt_img->field = V4L2_FIELD_NONE;
> +
> +	/* Initialize try_fmt for the embedded metadata pad */
> +	try_fmt_meta->width = IMX519_EMBEDDED_LINE_WIDTH;
> +	try_fmt_meta->height = IMX519_NUM_EMBEDDED_LINES;
> +	try_fmt_meta->code = MEDIA_BUS_FMT_SENSOR_DATA;
> +	try_fmt_meta->field = V4L2_FIELD_NONE;
> +
> +	/* Initialize try_crop */
> +	try_crop = v4l2_subdev_get_try_crop(sd, fh->state, IMAGE_PAD);
> +	try_crop->left = IMX519_PIXEL_ARRAY_LEFT;
> +	try_crop->top = IMX519_PIXEL_ARRAY_TOP;
> +	try_crop->width = IMX519_PIXEL_ARRAY_WIDTH;
> +	try_crop->height = IMX519_PIXEL_ARRAY_HEIGHT;
> +
> +	mutex_unlock(&imx519->mutex);

It'd be nicer to do this in the init_cfg callback.

In general, also switching to subdev state API would be nice. An example,
possibly somewhat unpolished, can be found here:
<URL:https://git.kernel.org/pub/scm/linux/kernel/git/tomba/linux.git/commit/?h=streams/work&id=d865071782564f1f118d7ad5d4b6813f47d908b5>.

> +
> +	return 0;
> +}
> +
> +static void imx519_adjust_exposure_range(struct imx519 *imx519)
> +{
> +	int exposure_max, exposure_def;
> +
> +	/* Honour the VBLANK limits when setting exposure. */
> +	exposure_max = imx519->mode->height + imx519->vblank->val -
> +		       IMX519_EXPOSURE_OFFSET;
> +	exposure_def = min(exposure_max, imx519->exposure->val);
> +	__v4l2_ctrl_modify_range(imx519->exposure, imx519->exposure->minimum,
> +				 exposure_max, imx519->exposure->step,
> +				 exposure_def);
> +}
> +
> +static int imx519_set_frame_length(struct imx519 *imx519, unsigned int val)
> +{
> +	int ret = 0;
> +
> +	imx519->long_exp_shift = 0;
> +
> +	while (val > IMX519_FRAME_LENGTH_MAX) {
> +		imx519->long_exp_shift++;
> +		val >>= 1;
> +	}
> +
> +	ret = imx519_write_reg(imx519, IMX519_REG_FRAME_LENGTH,
> +			       IMX519_REG_VALUE_16BIT, val);
> +	if (ret)
> +		return ret;
> +
> +	return imx519_write_reg(imx519, IMX519_LONG_EXP_SHIFT_REG,
> +				IMX519_REG_VALUE_08BIT, imx519->long_exp_shift);
> +}
> +
> +static int imx519_set_ctrl(struct v4l2_ctrl *ctrl)
> +{
> +	struct imx519 *imx519 =
> +		container_of(ctrl->handler, struct imx519, ctrl_handler);
> +	struct i2c_client *client = v4l2_get_subdevdata(&imx519->sd);
> +	int ret = 0;
> +
> +	/*
> +	 * The VBLANK control may change the limits of usable exposure, so check
> +	 * and adjust if necessary.
> +	 */
> +	if (ctrl->id == V4L2_CID_VBLANK)
> +		imx519_adjust_exposure_range(imx519);
> +
> +	/*
> +	 * Applying V4L2 control value only happens
> +	 * when power is up for streaming
> +	 */
> +	if (pm_runtime_get_if_in_use(&client->dev) == 0)
> +		return 0;
> +
> +	switch (ctrl->id) {
> +	case V4L2_CID_ANALOGUE_GAIN:
> +		ret = imx519_write_reg(imx519, IMX519_REG_ANALOG_GAIN,
> +				       IMX519_REG_VALUE_16BIT, ctrl->val);
> +		break;
> +	case V4L2_CID_EXPOSURE:
> +		ret = imx519_write_reg(imx519, IMX519_REG_EXPOSURE,
> +				       IMX519_REG_VALUE_16BIT, ctrl->val >>
> +							imx519->long_exp_shift);
> +		break;
> +	case V4L2_CID_DIGITAL_GAIN:
> +		ret = imx519_write_reg(imx519, IMX519_REG_DIGITAL_GAIN,
> +				       IMX519_REG_VALUE_16BIT, ctrl->val);
> +		break;
> +	case V4L2_CID_TEST_PATTERN:
> +		ret = imx519_write_reg(imx519, IMX519_REG_TEST_PATTERN,
> +				       IMX519_REG_VALUE_16BIT,
> +				       imx519_test_pattern_val[ctrl->val]);
> +		break;
> +	case V4L2_CID_TEST_PATTERN_RED:
> +		ret = imx519_write_reg(imx519, IMX519_REG_TEST_PATTERN_R,
> +				       IMX519_REG_VALUE_16BIT, ctrl->val);
> +		break;
> +	case V4L2_CID_TEST_PATTERN_GREENR:
> +		ret = imx519_write_reg(imx519, IMX519_REG_TEST_PATTERN_GR,
> +				       IMX519_REG_VALUE_16BIT, ctrl->val);
> +		break;
> +	case V4L2_CID_TEST_PATTERN_BLUE:
> +		ret = imx519_write_reg(imx519, IMX519_REG_TEST_PATTERN_B,
> +				       IMX519_REG_VALUE_16BIT, ctrl->val);
> +		break;
> +	case V4L2_CID_TEST_PATTERN_GREENB:
> +		ret = imx519_write_reg(imx519, IMX519_REG_TEST_PATTERN_GB,
> +				       IMX519_REG_VALUE_16BIT, ctrl->val);
> +		break;
> +	case V4L2_CID_HFLIP:
> +	case V4L2_CID_VFLIP:
> +		ret = imx519_write_reg(imx519, IMX519_REG_ORIENTATION, 1,
> +				       imx519->hflip->val |
> +				       imx519->vflip->val << 1);
> +		break;
> +	case V4L2_CID_VBLANK:
> +		ret = imx519_set_frame_length(imx519,
> +					      imx519->mode->height + ctrl->val);
> +		break;
> +	default:
> +		dev_info(&client->dev,
> +			 "ctrl(id:0x%x,val:0x%x) is not handled\n",
> +			 ctrl->id, ctrl->val);
> +		ret = -EINVAL;
> +		break;
> +	}
> +
> +	pm_runtime_put(&client->dev);
> +
> +	return ret;
> +}
> +
> +static const struct v4l2_ctrl_ops imx519_ctrl_ops = {
> +	.s_ctrl = imx519_set_ctrl,
> +};
> +
> +static int imx519_enum_mbus_code(struct v4l2_subdev *sd,
> +				 struct v4l2_subdev_state *sd_state,
> +				 struct v4l2_subdev_mbus_code_enum *code)
> +{
> +	struct imx519 *imx519 = to_imx519(sd);
> +
> +	if (code->pad >= NUM_PADS)
> +		return -EINVAL;

The caller will have checked for this already, same for other callbacks.

> +
> +	if (code->pad == IMAGE_PAD) {
> +		if (code->index > 0)
> +			return -EINVAL;
> +
> +		code->code = imx519_get_format_code(imx519);
> +	} else {
> +		if (code->index > 0)
> +			return -EINVAL;
> +
> +		code->code = MEDIA_BUS_FMT_SENSOR_DATA;
> +	}
> +
> +	return 0;
> +}
> +
> +static int imx519_enum_frame_size(struct v4l2_subdev *sd,
> +				  struct v4l2_subdev_state *sd_state,
> +				  struct v4l2_subdev_frame_size_enum *fse)
> +{
> +	struct imx519 *imx519 = to_imx519(sd);
> +
> +	if (fse->pad >= NUM_PADS)
> +		return -EINVAL;
> +
> +	if (fse->pad == IMAGE_PAD) {
> +		if (fse->index >= ARRAY_SIZE(supported_modes_10bit))
> +			return -EINVAL;
> +
> +		if (fse->code != imx519_get_format_code(imx519))
> +			return -EINVAL;
> +
> +		fse->min_width = supported_modes_10bit[fse->index].width;
> +		fse->max_width = fse->min_width;
> +		fse->min_height = supported_modes_10bit[fse->index].height;
> +		fse->max_height = fse->min_height;
> +	} else {
> +		if (fse->code != MEDIA_BUS_FMT_SENSOR_DATA || fse->index > 0)
> +			return -EINVAL;
> +
> +		fse->min_width = IMX519_EMBEDDED_LINE_WIDTH;
> +		fse->max_width = fse->min_width;
> +		fse->min_height = IMX519_NUM_EMBEDDED_LINES;
> +		fse->max_height = fse->min_height;
> +	}
> +
> +	return 0;
> +}
> +
> +static void imx519_reset_colorspace(struct v4l2_mbus_framefmt *fmt)
> +{
> +	fmt->colorspace = V4L2_COLORSPACE_RAW;
> +	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 void imx519_update_image_pad_format(struct imx519 *imx519,
> +					   const struct imx519_mode *mode,
> +					   struct v4l2_subdev_format *fmt)
> +{
> +	fmt->format.width = mode->width;
> +	fmt->format.height = mode->height;
> +	fmt->format.field = V4L2_FIELD_NONE;
> +	imx519_reset_colorspace(&fmt->format);
> +}
> +
> +static void imx519_update_metadata_pad_format(struct v4l2_subdev_format *fmt)
> +{
> +	fmt->format.width = IMX519_EMBEDDED_LINE_WIDTH;
> +	fmt->format.height = IMX519_NUM_EMBEDDED_LINES;
> +	fmt->format.code = MEDIA_BUS_FMT_SENSOR_DATA;
> +	fmt->format.field = V4L2_FIELD_NONE;
> +}
> +
> +static int imx519_get_pad_format(struct v4l2_subdev *sd,
> +				 struct v4l2_subdev_state *sd_state,
> +				 struct v4l2_subdev_format *fmt)
> +{
> +	struct imx519 *imx519 = to_imx519(sd);
> +
> +	if (fmt->pad >= NUM_PADS)
> +		return -EINVAL;
> +
> +	mutex_lock(&imx519->mutex);
> +
> +	if (fmt->which == V4L2_SUBDEV_FORMAT_TRY) {
> +		struct v4l2_mbus_framefmt *try_fmt =
> +			v4l2_subdev_get_try_format(&imx519->sd, sd_state,
> +						   fmt->pad);
> +		/* update the code which could change due to vflip or hflip: */
> +		try_fmt->code = fmt->pad == IMAGE_PAD ?
> +				imx519_get_format_code(imx519) :
> +				MEDIA_BUS_FMT_SENSOR_DATA;
> +		fmt->format = *try_fmt;
> +	} else {
> +		if (fmt->pad == IMAGE_PAD) {
> +			imx519_update_image_pad_format(imx519, imx519->mode,
> +						       fmt);
> +			fmt->format.code =
> +			       imx519_get_format_code(imx519);
> +		} else {
> +			imx519_update_metadata_pad_format(fmt);
> +		}
> +	}
> +
> +	mutex_unlock(&imx519->mutex);
> +	return 0;
> +}
> +
> +static
> +unsigned int imx519_get_frame_length(const struct imx519_mode *mode,
> +				     const struct v4l2_fract *timeperframe)
> +{
> +	u64 frame_length;
> +
> +	frame_length = (u64)timeperframe->numerator * IMX519_PIXEL_RATE;
> +	do_div(frame_length,
> +	       (u64)timeperframe->denominator * mode->line_length_pix);
> +
> +	if (WARN_ON(frame_length > IMX519_FRAME_LENGTH_MAX))
> +		frame_length = IMX519_FRAME_LENGTH_MAX;
> +
> +	return max_t(unsigned int, frame_length, mode->height);
> +}
> +
> +static void imx519_set_framing_limits(struct imx519 *imx519)
> +{
> +	unsigned int frm_length_min, frm_length_default, hblank;
> +	const struct imx519_mode *mode = imx519->mode;
> +
> +	frm_length_min = imx519_get_frame_length(mode, &mode->timeperframe_min);
> +	frm_length_default =
> +		     imx519_get_frame_length(mode, &mode->timeperframe_default);
> +
> +	/* Default to no long exposure multiplier. */
> +	imx519->long_exp_shift = 0;
> +
> +	/* Update limits and set FPS to default */
> +	__v4l2_ctrl_modify_range(imx519->vblank, frm_length_min - mode->height,
> +				 ((1 << IMX519_LONG_EXP_SHIFT_MAX) *
> +					IMX519_FRAME_LENGTH_MAX) - mode->height,
> +				 1, frm_length_default - mode->height);
> +
> +	/* Setting this will adjust the exposure limits as well. */
> +	__v4l2_ctrl_s_ctrl(imx519->vblank, frm_length_default - mode->height);
> +
> +	/*
> +	 * Currently PPL is fixed to the mode specified value, so hblank
> +	 * depends on mode->width only, and is not changeable in any
> +	 * way other than changing the mode.
> +	 */
> +	hblank = mode->line_length_pix - mode->width;
> +	__v4l2_ctrl_modify_range(imx519->hblank, hblank, hblank, 1, hblank);
> +}
> +
> +static int imx519_set_pad_format(struct v4l2_subdev *sd,
> +				 struct v4l2_subdev_state *sd_state,
> +				 struct v4l2_subdev_format *fmt)
> +{
> +	struct v4l2_mbus_framefmt *framefmt;
> +	const struct imx519_mode *mode;
> +	struct imx519 *imx519 = to_imx519(sd);
> +
> +	if (fmt->pad >= NUM_PADS)
> +		return -EINVAL;
> +
> +	mutex_lock(&imx519->mutex);
> +
> +	if (fmt->pad == IMAGE_PAD) {
> +		/* Bayer order varies with flips */
> +		fmt->format.code = imx519_get_format_code(imx519);
> +
> +		mode = v4l2_find_nearest_size(supported_modes_10bit,
> +					      ARRAY_SIZE(supported_modes_10bit),
> +					      width, height,
> +					      fmt->format.width,
> +					      fmt->format.height);
> +		imx519_update_image_pad_format(imx519, mode, fmt);
> +		if (fmt->which == V4L2_SUBDEV_FORMAT_TRY) {
> +			framefmt = v4l2_subdev_get_try_format(sd, sd_state,
> +							      fmt->pad);
> +			*framefmt = fmt->format;
> +		} else {
> +			imx519->mode = mode;
> +			imx519->fmt_code = fmt->format.code;
> +			imx519_set_framing_limits(imx519);
> +		}
> +	} else {
> +		if (fmt->which == V4L2_SUBDEV_FORMAT_TRY) {
> +			framefmt = v4l2_subdev_get_try_format(sd, sd_state,
> +							      fmt->pad);
> +			*framefmt = fmt->format;
> +		} else {
> +			/* Only one embedded data mode is supported */
> +			imx519_update_metadata_pad_format(fmt);
> +		}
> +	}
> +
> +	mutex_unlock(&imx519->mutex);
> +
> +	return 0;
> +}
> +
> +static const struct v4l2_rect *
> +__imx519_get_pad_crop(struct imx519 *imx519, struct v4l2_subdev_state *sd_state,
> +		      unsigned int pad, enum v4l2_subdev_format_whence which)
> +{
> +	switch (which) {
> +	case V4L2_SUBDEV_FORMAT_TRY:
> +		return v4l2_subdev_get_try_crop(&imx519->sd, sd_state, pad);
> +	case V4L2_SUBDEV_FORMAT_ACTIVE:
> +		return &imx519->mode->crop;
> +	}
> +
> +	return NULL;
> +}
> +
> +static int imx519_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: {
> +		struct imx519 *imx519 = to_imx519(sd);
> +
> +		mutex_lock(&imx519->mutex);
> +		sel->r = *__imx519_get_pad_crop(imx519, sd_state, sel->pad,
> +						sel->which);
> +		mutex_unlock(&imx519->mutex);
> +
> +		return 0;
> +	}
> +
> +	case V4L2_SEL_TGT_NATIVE_SIZE:
> +		sel->r.left = 0;
> +		sel->r.top = 0;
> +		sel->r.width = IMX519_NATIVE_WIDTH;
> +		sel->r.height = IMX519_NATIVE_HEIGHT;
> +
> +		return 0;
> +
> +	case V4L2_SEL_TGT_CROP_DEFAULT:
> +	case V4L2_SEL_TGT_CROP_BOUNDS:
> +		sel->r.left = IMX519_PIXEL_ARRAY_LEFT;
> +		sel->r.top = IMX519_PIXEL_ARRAY_TOP;
> +		sel->r.width = IMX519_PIXEL_ARRAY_WIDTH;
> +		sel->r.height = IMX519_PIXEL_ARRAY_HEIGHT;
> +
> +		return 0;
> +	}
> +
> +	return -EINVAL;
> +}
> +
> +/* Start streaming */
> +static int imx519_start_streaming(struct imx519 *imx519)
> +{
> +	struct i2c_client *client = v4l2_get_subdevdata(&imx519->sd);
> +	const struct imx519_reg_list *reg_list;
> +	int ret;
> +
> +	if (!imx519->common_regs_written) {
> +		ret = imx519_write_regs(imx519, mode_common_regs,
> +					ARRAY_SIZE(mode_common_regs));
> +
> +		if (ret) {
> +			dev_err(&client->dev, "%s failed to set common settings\n",
> +				__func__);
> +			return ret;
> +		}
> +		imx519->common_regs_written = true;
> +	}
> +
> +	/* Apply default values of current mode */
> +	reg_list = &imx519->mode->reg_list;
> +	ret = imx519_write_regs(imx519, reg_list->regs, reg_list->num_of_regs);
> +	if (ret) {
> +		dev_err(&client->dev, "%s failed to set mode\n", __func__);
> +		return ret;
> +	}
> +
> +	/* Apply customized values from user */
> +	ret =  __v4l2_ctrl_handler_setup(imx519->sd.ctrl_handler);
> +	if (ret)
> +		return ret;
> +
> +	/* set stream on register */
> +	return imx519_write_reg(imx519, IMX519_REG_MODE_SELECT,
> +				IMX519_REG_VALUE_08BIT, IMX519_MODE_STREAMING);
> +}
> +
> +/* Stop streaming */
> +static void imx519_stop_streaming(struct imx519 *imx519)
> +{
> +	struct i2c_client *client = v4l2_get_subdevdata(&imx519->sd);
> +	int ret;
> +
> +	/* set stream off register */
> +	ret = imx519_write_reg(imx519, IMX519_REG_MODE_SELECT,
> +			       IMX519_REG_VALUE_08BIT, IMX519_MODE_STANDBY);
> +	if (ret)
> +		dev_err(&client->dev, "%s failed to set stream\n", __func__);
> +
> +	__v4l2_ctrl_grab(imx519->vflip, false);
> +	__v4l2_ctrl_grab(imx519->hflip, false);
> +}
> +
> +static int imx519_set_stream(struct v4l2_subdev *sd, int enable)
> +{
> +	struct imx519 *imx519 = to_imx519(sd);
> +	struct i2c_client *client = v4l2_get_subdevdata(sd);
> +	int ret = 0;
> +
> +	mutex_lock(&imx519->mutex);
> +	if (imx519->streaming == enable) {
> +		mutex_unlock(&imx519->mutex);
> +		return 0;
> +	}
> +
> +	if (enable) {
> +		ret = pm_runtime_get_sync(&client->dev);
> +		if (ret < 0) {
> +			pm_runtime_put_noidle(&client->dev);
> +			goto err_unlock;
> +		}
> +
> +		/*
> +		 * Apply default & customized values
> +		 * and then start streaming.
> +		 */
> +		ret = imx519_start_streaming(imx519);
> +		if (ret)
> +			goto err_rpm_put;
> +	} else {
> +		imx519_stop_streaming(imx519);
> +		pm_runtime_put(&client->dev);
> +	}
> +
> +	imx519->streaming = enable;
> +
> +	/* vflip and hflip cannot change during streaming */
> +	__v4l2_ctrl_grab(imx519->vflip, enable);
> +	__v4l2_ctrl_grab(imx519->hflip, enable);
> +
> +	mutex_unlock(&imx519->mutex);
> +
> +	return ret;
> +
> +err_rpm_put:
> +	pm_runtime_put(&client->dev);
> +err_unlock:
> +	mutex_unlock(&imx519->mutex);
> +
> +	return ret;
> +}
> +
> +/* Power/clock management functions */
> +static int imx519_power_on(struct device *dev)
> +{
> +	struct i2c_client *client = to_i2c_client(dev);
> +	struct v4l2_subdev *sd = i2c_get_clientdata(client);
> +	struct imx519 *imx519 = to_imx519(sd);
> +	int ret;
> +
> +	ret = regulator_bulk_enable(IMX519_NUM_SUPPLIES,
> +				    imx519->supplies);
> +	if (ret) {
> +		dev_err(&client->dev, "%s: failed to enable regulators\n",
> +			__func__);
> +		return ret;
> +	}
> +
> +	ret = clk_prepare_enable(imx519->xclk);
> +	if (ret) {
> +		dev_err(&client->dev, "%s: failed to enable clock\n",
> +			__func__);
> +		goto reg_off;
> +	}
> +
> +	gpiod_set_value_cansleep(imx519->reset_gpio, 1);
> +	usleep_range(IMX519_XCLR_MIN_DELAY_US,
> +		     IMX519_XCLR_MIN_DELAY_US + IMX519_XCLR_DELAY_RANGE_US);
> +
> +	return 0;
> +
> +reg_off:
> +	regulator_bulk_disable(IMX519_NUM_SUPPLIES, imx519->supplies);
> +
> +	return ret;
> +}
> +
> +static int imx519_power_off(struct device *dev)
> +{
> +	struct i2c_client *client = to_i2c_client(dev);
> +	struct v4l2_subdev *sd = i2c_get_clientdata(client);
> +	struct imx519 *imx519 = to_imx519(sd);
> +
> +	gpiod_set_value_cansleep(imx519->reset_gpio, 0);
> +	regulator_bulk_disable(IMX519_NUM_SUPPLIES, imx519->supplies);
> +	clk_disable_unprepare(imx519->xclk);
> +
> +	/* Force reprogramming of the common registers when powered up again. */
> +	imx519->common_regs_written = false;
> +
> +	return 0;
> +}
> +
> +static int __maybe_unused imx519_suspend(struct device *dev)
> +{
> +	struct i2c_client *client = to_i2c_client(dev);
> +	struct v4l2_subdev *sd = i2c_get_clientdata(client);
> +	struct imx519 *imx519 = to_imx519(sd);
> +
> +	if (imx519->streaming)
> +		imx519_stop_streaming(imx519);
> +
> +	return 0;
> +}
> +
> +static int __maybe_unused imx519_resume(struct device *dev)
> +{
> +	struct i2c_client *client = to_i2c_client(dev);
> +	struct v4l2_subdev *sd = i2c_get_clientdata(client);
> +	struct imx519 *imx519 = to_imx519(sd);
> +	int ret;
> +
> +	if (imx519->streaming) {
> +		ret = imx519_start_streaming(imx519);
> +		if (ret)
> +			goto error;
> +	}
> +
> +	return 0;
> +
> +error:
> +	imx519_stop_streaming(imx519);
> +	imx519->streaming = 0;
> +	return ret;
> +}
> +
> +static int imx519_get_regulators(struct imx519 *imx519)
> +{
> +	struct i2c_client *client = v4l2_get_subdevdata(&imx519->sd);
> +	unsigned int i;
> +
> +	for (i = 0; i < IMX519_NUM_SUPPLIES; i++)
> +		imx519->supplies[i].supply = imx519_supply_name[i];
> +
> +	return devm_regulator_bulk_get(&client->dev,
> +				       IMX519_NUM_SUPPLIES,
> +				       imx519->supplies);
> +}
> +
> +/* Verify chip ID */
> +static int imx519_identify_module(struct imx519 *imx519, u32 expected_id)
> +{
> +	struct i2c_client *client = v4l2_get_subdevdata(&imx519->sd);
> +	int ret;
> +	u32 val;
> +
> +	ret = imx519_read_reg(imx519, IMX519_REG_CHIP_ID,
> +			      IMX519_REG_VALUE_16BIT, &val);
> +	if (ret) {
> +		dev_err(&client->dev, "failed to read chip id %x, with error %d\n",
> +			expected_id, ret);
> +		return ret;
> +	}
> +
> +	if (val != expected_id) {
> +		dev_err(&client->dev, "chip id mismatch: %x!=%x\n",
> +			expected_id, val);
> +		return -EIO;
> +	}
> +
> +	dev_info(&client->dev, "Device found is imx%x\n", val);
> +
> +	return 0;
> +}
> +
> +static const struct v4l2_subdev_core_ops imx519_core_ops = {
> +	.subscribe_event = v4l2_ctrl_subdev_subscribe_event,
> +	.unsubscribe_event = v4l2_event_subdev_unsubscribe,
> +};
> +
> +static const struct v4l2_subdev_video_ops imx519_video_ops = {
> +	.s_stream = imx519_set_stream,
> +};
> +
> +static const struct v4l2_subdev_pad_ops imx519_pad_ops = {
> +	.enum_mbus_code = imx519_enum_mbus_code,
> +	.get_fmt = imx519_get_pad_format,
> +	.set_fmt = imx519_set_pad_format,
> +	.get_selection = imx519_get_selection,
> +	.enum_frame_size = imx519_enum_frame_size,
> +};
> +
> +static const struct v4l2_subdev_ops imx519_subdev_ops = {
> +	.core = &imx519_core_ops,
> +	.video = &imx519_video_ops,
> +	.pad = &imx519_pad_ops,
> +};
> +
> +static const struct v4l2_subdev_internal_ops imx519_internal_ops = {
> +	.open = imx519_open,
> +};
> +
> +/* Initialize control handlers */
> +static int imx519_init_controls(struct imx519 *imx519)
> +{
> +	struct v4l2_ctrl_handler *ctrl_hdlr;
> +	struct i2c_client *client = v4l2_get_subdevdata(&imx519->sd);
> +	struct v4l2_fwnode_device_properties props;
> +	unsigned int i;
> +	int ret;
> +
> +	ctrl_hdlr = &imx519->ctrl_handler;
> +	ret = v4l2_ctrl_handler_init(ctrl_hdlr, 16);
> +	if (ret)
> +		return ret;
> +
> +	mutex_init(&imx519->mutex);
> +	ctrl_hdlr->lock = &imx519->mutex;
> +
> +	/* By default, PIXEL_RATE is read only */
> +	imx519->pixel_rate = v4l2_ctrl_new_std(ctrl_hdlr, &imx519_ctrl_ops,
> +					       V4L2_CID_PIXEL_RATE,
> +					       IMX519_PIXEL_RATE,
> +					       IMX519_PIXEL_RATE, 1,
> +					       IMX519_PIXEL_RATE);
> +
> +	/*
> +	 * Create the controls here, but mode specific limits are setup
> +	 * in the imx519_set_framing_limits() call below.
> +	 */
> +	imx519->vblank = v4l2_ctrl_new_std(ctrl_hdlr, &imx519_ctrl_ops,
> +					   V4L2_CID_VBLANK, 0, 0xffff, 1, 0);
> +	imx519->hblank = v4l2_ctrl_new_std(ctrl_hdlr, &imx519_ctrl_ops,
> +					   V4L2_CID_HBLANK, 0, 0xffff, 1, 0);
> +
> +	/* HBLANK is read-only for now, but does change with mode. */
> +	if (imx519->hblank)
> +		imx519->hblank->flags |= V4L2_CTRL_FLAG_READ_ONLY;
> +
> +	imx519->exposure = v4l2_ctrl_new_std(ctrl_hdlr, &imx519_ctrl_ops,
> +					     V4L2_CID_EXPOSURE,
> +					     IMX519_EXPOSURE_MIN,
> +					     IMX519_EXPOSURE_MAX,
> +					     IMX519_EXPOSURE_STEP,
> +					     IMX519_EXPOSURE_DEFAULT);
> +
> +	v4l2_ctrl_new_std(ctrl_hdlr, &imx519_ctrl_ops, V4L2_CID_ANALOGUE_GAIN,
> +			  IMX519_ANA_GAIN_MIN, IMX519_ANA_GAIN_MAX,
> +			  IMX519_ANA_GAIN_STEP, IMX519_ANA_GAIN_DEFAULT);
> +
> +	v4l2_ctrl_new_std(ctrl_hdlr, &imx519_ctrl_ops, V4L2_CID_DIGITAL_GAIN,
> +			  IMX519_DGTL_GAIN_MIN, IMX519_DGTL_GAIN_MAX,
> +			  IMX519_DGTL_GAIN_STEP, IMX519_DGTL_GAIN_DEFAULT);
> +
> +	imx519->hflip = v4l2_ctrl_new_std(ctrl_hdlr, &imx519_ctrl_ops,
> +					  V4L2_CID_HFLIP, 0, 1, 1, 0);
> +	if (imx519->hflip)
> +		imx519->hflip->flags |= V4L2_CTRL_FLAG_MODIFY_LAYOUT;
> +
> +	imx519->vflip = v4l2_ctrl_new_std(ctrl_hdlr, &imx519_ctrl_ops,
> +					  V4L2_CID_VFLIP, 0, 1, 1, 0);
> +	if (imx519->vflip)
> +		imx519->vflip->flags |= V4L2_CTRL_FLAG_MODIFY_LAYOUT;
> +
> +	v4l2_ctrl_new_std_menu_items(ctrl_hdlr, &imx519_ctrl_ops,
> +				     V4L2_CID_TEST_PATTERN,
> +				     ARRAY_SIZE(imx519_test_pattern_menu) - 1,
> +				     0, 0, imx519_test_pattern_menu);
> +	for (i = 0; i < 4; i++) {
> +		/*
> +		 * The assumption is that
> +		 * V4L2_CID_TEST_PATTERN_GREENR == V4L2_CID_TEST_PATTERN_RED + 1
> +		 * V4L2_CID_TEST_PATTERN_BLUE   == V4L2_CID_TEST_PATTERN_RED + 2
> +		 * V4L2_CID_TEST_PATTERN_GREENB == V4L2_CID_TEST_PATTERN_RED + 3
> +		 */
> +		v4l2_ctrl_new_std(ctrl_hdlr, &imx519_ctrl_ops,
> +				  V4L2_CID_TEST_PATTERN_RED + i,
> +				  IMX519_TEST_PATTERN_COLOUR_MIN,
> +				  IMX519_TEST_PATTERN_COLOUR_MAX,
> +				  IMX519_TEST_PATTERN_COLOUR_STEP,
> +				  IMX519_TEST_PATTERN_COLOUR_MAX);
> +		/* The "Solid color" pattern is white by default */
> +	}
> +
> +	if (ctrl_hdlr->error) {
> +		ret = ctrl_hdlr->error;
> +		dev_err(&client->dev, "%s control init failed (%d)\n",
> +			__func__, ret);
> +		goto error;
> +	}
> +
> +	ret = v4l2_fwnode_device_parse(&client->dev, &props);
> +	if (ret)
> +		goto error;
> +
> +	ret = v4l2_ctrl_new_fwnode_properties(ctrl_hdlr, &imx519_ctrl_ops,
> +					      &props);
> +	if (ret)
> +		goto error;
> +
> +	imx519->sd.ctrl_handler = ctrl_hdlr;
> +
> +	/* Setup exposure and frame/line length limits. */
> +	imx519_set_framing_limits(imx519);
> +
> +	return 0;
> +
> +error:
> +	v4l2_ctrl_handler_free(ctrl_hdlr);
> +	mutex_destroy(&imx519->mutex);
> +
> +	return ret;
> +}
> +
> +static void imx519_free_controls(struct imx519 *imx519)
> +{
> +	v4l2_ctrl_handler_free(imx519->sd.ctrl_handler);
> +	mutex_destroy(&imx519->mutex);
> +}
> +
> +static int imx519_check_hwcfg(struct device *dev)
> +{
> +	struct fwnode_handle *endpoint;
> +	struct v4l2_fwnode_endpoint ep_cfg = {
> +		.bus_type = V4L2_MBUS_CSI2_DPHY
> +	};
> +	int ret = -EINVAL;
> +
> +	endpoint = fwnode_graph_get_next_endpoint(dev_fwnode(dev), NULL);
> +	if (!endpoint) {
> +		dev_err(dev, "endpoint node not found\n");
> +		return -EINVAL;
> +	}
> +
> +	if (v4l2_fwnode_endpoint_alloc_parse(endpoint, &ep_cfg)) {
> +		dev_err(dev, "could not parse endpoint\n");
> +		goto error_out;
> +	}
> +
> +	/* Check the number of MIPI CSI2 data lanes */
> +	if (ep_cfg.bus.mipi_csi2.num_data_lanes != 2) {
> +		dev_err(dev, "only 2 data lanes are currently supported\n");
> +		goto error_out;
> +	}
> +
> +	/* Check the link frequency set in device tree */
> +	if (!ep_cfg.nr_of_link_frequencies) {
> +		dev_err(dev, "link-frequency property not found in DT\n");
> +		goto error_out;
> +	}
> +
> +	if (ep_cfg.nr_of_link_frequencies != 1 ||
> +	    ep_cfg.link_frequencies[0] != IMX519_DEFAULT_LINK_FREQ) {
> +		dev_err(dev, "Link frequency not supported: %lld\n",
> +			ep_cfg.link_frequencies[0]);
> +		goto error_out;
> +	}
> +
> +	ret = 0;
> +
> +error_out:
> +	v4l2_fwnode_endpoint_free(&ep_cfg);
> +	fwnode_handle_put(endpoint);
> +
> +	return ret;
> +}
> +
> +static const struct of_device_id imx519_dt_ids[] = {
> +	{ .compatible = "sony,imx519"},
> +	{ /* sentinel */ }
> +};
> +
> +static int imx519_probe(struct i2c_client *client)
> +{
> +	struct device *dev = &client->dev;
> +	struct imx519 *imx519;
> +	const struct of_device_id *match;
> +	u32 xclk_freq;
> +	int ret;
> +
> +	imx519 = devm_kzalloc(&client->dev, sizeof(*imx519), GFP_KERNEL);
> +	if (!imx519)
> +		return -ENOMEM;
> +
> +	v4l2_i2c_subdev_init(&imx519->sd, client, &imx519_subdev_ops);
> +
> +	match = of_match_device(imx519_dt_ids, dev);
> +	if (!match)
> +		return -ENODEV;

You only handle a single device, do you need this?

> +
> +	/* Check the hardware configuration in device tree */
> +	if (imx519_check_hwcfg(dev))
> +		return -EINVAL;
> +
> +	/* Get system clock (xclk) */
> +	imx519->xclk = devm_clk_get(dev, NULL);
> +	if (IS_ERR(imx519->xclk)) {
> +		dev_err(dev, "failed to get xclk\n");
> +		return PTR_ERR(imx519->xclk);
> +	}
> +
> +	xclk_freq = clk_get_rate(imx519->xclk);
> +	if (xclk_freq != IMX519_XCLK_FREQ) {
> +		dev_err(dev, "xclk frequency not supported: %d Hz\n",
> +			xclk_freq);
> +		return -EINVAL;
> +	}
> +
> +	ret = imx519_get_regulators(imx519);
> +	if (ret) {
> +		dev_err(dev, "failed to get regulators\n");
> +		return ret;
> +	}
> +
> +	/* Request optional enable pin */
> +	imx519->reset_gpio = devm_gpiod_get_optional(dev, "reset",
> +						     GPIOD_OUT_HIGH);
> +
> +	/*
> +	 * The sensor must be powered for imx519_identify_module()
> +	 * to be able to read the CHIP_ID register
> +	 */
> +	ret = imx519_power_on(dev);
> +	if (ret)
> +		return ret;
> +
> +	ret = imx519_identify_module(imx519, IMX519_CHIP_ID);
> +	if (ret)
> +		goto error_power_off;
> +
> +	/* Set default mode to max resolution */
> +	imx519->mode = &supported_modes_10bit[0];
> +	imx519->fmt_code = MEDIA_BUS_FMT_SRGGB10_1X10;
> +
> +	/* Enable runtime PM and turn off the device */
> +	pm_runtime_set_active(dev);
> +	pm_runtime_enable(dev);
> +	pm_runtime_idle(dev);
> +
> +	/* This needs the pm runtime to be registered. */
> +	ret = imx519_init_controls(imx519);
> +	if (ret)
> +		goto error_power_off;
> +
> +	/* Initialize subdev */
> +	imx519->sd.internal_ops = &imx519_internal_ops;
> +	imx519->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE |
> +			    V4L2_SUBDEV_FL_HAS_EVENTS;
> +	imx519->sd.entity.function = MEDIA_ENT_F_CAM_SENSOR;
> +
> +	/* Initialize source pads */
> +	imx519->pad[IMAGE_PAD].flags = MEDIA_PAD_FL_SOURCE;
> +	imx519->pad[METADATA_PAD].flags = MEDIA_PAD_FL_SOURCE;
> +
> +	ret = media_entity_pads_init(&imx519->sd.entity, NUM_PADS, imx519->pad);
> +	if (ret) {
> +		dev_err(dev, "failed to init entity pads: %d\n", ret);
> +		goto error_handler_free;
> +	}
> +
> +	ret = v4l2_async_register_subdev_sensor(&imx519->sd);
> +	if (ret < 0) {
> +		dev_err(dev, "failed to register sensor sub-device: %d\n", ret);
> +		goto error_media_entity;
> +	}
> +
> +	return 0;
> +
> +error_media_entity:
> +	media_entity_cleanup(&imx519->sd.entity);
> +
> +error_handler_free:
> +	imx519_free_controls(imx519);
> +
> +error_power_off:
> +	pm_runtime_disable(&client->dev);
> +	pm_runtime_set_suspended(&client->dev);
> +	imx519_power_off(&client->dev);
> +
> +	return ret;
> +}
> +
> +static void imx519_remove(struct i2c_client *client)
> +{
> +	struct v4l2_subdev *sd = i2c_get_clientdata(client);
> +	struct imx519 *imx519 = to_imx519(sd);
> +
> +	v4l2_async_unregister_subdev(sd);
> +	media_entity_cleanup(&sd->entity);
> +	imx519_free_controls(imx519);
> +
> +	pm_runtime_disable(&client->dev);
> +	if (!pm_runtime_status_suspended(&client->dev))
> +		imx519_power_off(&client->dev);
> +	pm_runtime_set_suspended(&client->dev);
> +}
> +
> +MODULE_DEVICE_TABLE(of, imx519_dt_ids);
> +
> +static const struct dev_pm_ops imx519_pm_ops = {
> +	SET_SYSTEM_SLEEP_PM_OPS(imx519_suspend, imx519_resume)
> +	SET_RUNTIME_PM_OPS(imx519_power_off, imx519_power_on, NULL)
> +};
> +
> +static struct i2c_driver imx519_i2c_driver = {
> +	.driver = {
> +		.name = "imx519",
> +		.of_match_table	= imx519_dt_ids,
> +		.pm = &imx519_pm_ops,
> +	},
> +	.probe_new = imx519_probe,
> +	.remove = imx519_remove,
> +};
> +
> +module_i2c_driver(imx519_i2c_driver);
> +
> +MODULE_AUTHOR("Lee Jackson <lee.jackson@xxxxxxxxxxx>");
> +MODULE_DESCRIPTION("Sony IMX519 sensor driver");
> +MODULE_LICENSE("GPL v2");
> 

-- 
Kind regards,

Sakari Ailus