path: root/drivers/media/i2c/ov8865.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright 2020 Kévin L'hôpital <kevin.lhopital@bootlin.com>
 * Copyright 2020 Bootlin
 * Author: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
 */

#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/of_graph.h>
#include <linux/pm_runtime.h>
#include <linux/regulator/consumer.h>
#include <linux/videodev2.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-device.h>
#include <media/v4l2-fwnode.h>
#include <media/v4l2-image-sizes.h>
#include <media/v4l2-mediabus.h>

/* Clock rate */

#define OV8865_EXTCLK_RATE			24000000

/* Register definitions */

/* System */

#define OV8865_SW_STANDBY_REG			0x100
#define OV8865_SW_STANDBY_STREAM_ON		BIT(0)

#define OV8865_SW_RESET_REG			0x103
#define OV8865_SW_RESET_RESET			BIT(0)

#define OV8865_PLL_CTRL0_REG			0x300
#define OV8865_PLL_CTRL0_PRE_DIV(v)		((v) & GENMASK(2, 0))
#define OV8865_PLL_CTRL1_REG			0x301
#define OV8865_PLL_CTRL1_MUL_H(v)		(((v) & GENMASK(9, 8)) >> 8)
#define OV8865_PLL_CTRL2_REG			0x302
#define OV8865_PLL_CTRL2_MUL_L(v)		((v) & GENMASK(7, 0))
#define OV8865_PLL_CTRL3_REG			0x303
#define OV8865_PLL_CTRL3_M_DIV(v)		(((v) - 1) & GENMASK(3, 0))
#define OV8865_PLL_CTRL4_REG			0x304
#define OV8865_PLL_CTRL4_MIPI_DIV(v)		((v) & GENMASK(1, 0))
#define OV8865_PLL_CTRL5_REG			0x305
#define OV8865_PLL_CTRL5_SYS_PRE_DIV(v)		((v) & GENMASK(1, 0))
#define OV8865_PLL_CTRL6_REG			0x306
#define OV8865_PLL_CTRL6_SYS_DIV(v)		(((v) - 1) & BIT(0))

#define OV8865_PLL_CTRL8_REG			0x308
#define OV8865_PLL_CTRL9_REG			0x309
#define OV8865_PLL_CTRLA_REG			0x30a
#define OV8865_PLL_CTRLA_PRE_DIV_HALF(v)	(((v) - 1) & BIT(0))
#define OV8865_PLL_CTRLB_REG			0x30b
#define OV8865_PLL_CTRLB_PRE_DIV(v)		((v) & GENMASK(2, 0))
#define OV8865_PLL_CTRLC_REG			0x30c
#define OV8865_PLL_CTRLC_MUL_H(v)		(((v) & GENMASK(9, 8)) >> 8)
#define OV8865_PLL_CTRLD_REG			0x30d
#define OV8865_PLL_CTRLD_MUL_L(v)		((v) & GENMASK(7, 0))
#define OV8865_PLL_CTRLE_REG			0x30e
#define OV8865_PLL_CTRLE_SYS_DIV(v)		((v) & GENMASK(2, 0))
#define OV8865_PLL_CTRLF_REG			0x30f
#define OV8865_PLL_CTRLF_SYS_PRE_DIV(v)		(((v) - 1) & GENMASK(3, 0))
#define OV8865_PLL_CTRL10_REG			0x310
#define OV8865_PLL_CTRL11_REG			0x311
#define OV8865_PLL_CTRL12_REG			0x312
#define OV8865_PLL_CTRL12_PRE_DIV_HALF(v)	((((v) - 1) << 4) & BIT(4))
#define OV8865_PLL_CTRL12_DAC_DIV(v)		(((v) - 1) & GENMASK(3, 0))

#define OV8865_PLL_CTRL1B_REG			0x31b
#define OV8865_PLL_CTRL1C_REG			0x31c

#define OV8865_PLL_CTRL1E_REG			0x31e
#define OV8865_PLL_CTRL1E_PLL1_NO_LAT		BIT(3)

#define OV8865_PAD_OEN0_REG			0x3000

#define OV8865_PAD_OEN2_REG			0x3002

#define OV8865_CLK_RST5_REG			0x3005

#define OV8865_CHIP_ID_HH_REG			0x300a
#define OV8865_CHIP_ID_HH_VALUE			0x00
#define OV8865_CHIP_ID_H_REG			0x300b
#define OV8865_CHIP_ID_H_VALUE			0x88
#define OV8865_CHIP_ID_L_REG			0x300c
#define OV8865_CHIP_ID_L_VALUE			0x65
#define OV8865_PAD_OUT2_REG			0x300d

#define OV8865_PAD_SEL2_REG			0x3010
#define OV8865_PAD_PK_REG			0x3011
#define OV8865_PAD_PK_DRIVE_STRENGTH_1X		(0 << 5)
#define OV8865_PAD_PK_DRIVE_STRENGTH_2X		(1 << 5)
#define OV8865_PAD_PK_DRIVE_STRENGTH_3X		(2 << 5)
#define OV8865_PAD_PK_DRIVE_STRENGTH_4X		(3 << 5)

#define OV8865_PUMP_CLK_DIV_REG			0x3015
#define OV8865_PUMP_CLK_DIV_PUMP_N(v)		(((v) << 4) & GENMASK(6, 4))
#define OV8865_PUMP_CLK_DIV_PUMP_P(v)		((v) & GENMASK(2, 0))

#define OV8865_MIPI_SC_CTRL0_REG		0x3018
#define OV8865_MIPI_SC_CTRL0_LANES(v)		((((v) - 1) << 5) & \
						 GENMASK(7, 5))
#define OV8865_MIPI_SC_CTRL0_MIPI_EN		BIT(4)
#define OV8865_MIPI_SC_CTRL0_UNKNOWN		BIT(1)
#define OV8865_MIPI_SC_CTRL0_LANES_PD_MIPI	BIT(0)
#define OV8865_MIPI_SC_CTRL1_REG		0x3019
#define OV8865_CLK_RST0_REG			0x301a
#define OV8865_CLK_RST1_REG			0x301b
#define OV8865_CLK_RST2_REG			0x301c
#define OV8865_CLK_RST3_REG			0x301d
#define OV8865_CLK_RST4_REG			0x301e

#define OV8865_PCLK_SEL_REG			0x3020
#define OV8865_PCLK_SEL_PCLK_DIV_MASK		BIT(3)
#define OV8865_PCLK_SEL_PCLK_DIV(v)		((((v) - 1) << 3) & BIT(3))

#define OV8865_MISC_CTRL_REG			0x3021
#define OV8865_MIPI_SC_CTRL2_REG		0x3022
#define OV8865_MIPI_SC_CTRL2_CLK_LANES_PD_MIPI	BIT(1)
#define OV8865_MIPI_SC_CTRL2_PD_MIPI_RST_SYNC	BIT(0)

#define OV8865_MIPI_BIT_SEL_REG			0x3031
#define OV8865_MIPI_BIT_SEL(v)			(((v) << 0) & GENMASK(4, 0))
#define OV8865_CLK_SEL0_REG			0x3032
#define OV8865_CLK_SEL0_PLL1_SYS_SEL(v)		(((v) << 7) & BIT(7))
#define OV8865_CLK_SEL1_REG			0x3033
#define OV8865_CLK_SEL1_MIPI_EOF		BIT(5)
#define OV8865_CLK_SEL1_UNKNOWN			BIT(2)
#define OV8865_CLK_SEL1_PLL_SCLK_SEL_MASK	BIT(1)
#define OV8865_CLK_SEL1_PLL_SCLK_SEL(v)		(((v) << 1) & BIT(1))

#define OV8865_SCLK_CTRL_REG			0x3106
#define OV8865_SCLK_CTRL_SCLK_DIV(v)		(((v) << 4) & GENMASK(7, 4))
#define OV8865_SCLK_CTRL_SCLK_PRE_DIV(v)	(((v) << 2) & GENMASK(3, 2))
#define OV8865_SCLK_CTRL_UNKNOWN		BIT(0)

/* Exposure/gain */

#define OV8865_EXPOSURE_CTRL_HH_REG		0x3500
#define OV8865_EXPOSURE_CTRL_HH(v)		(((v) & GENMASK(19, 16)) >> 16)
#define OV8865_EXPOSURE_CTRL_H_REG		0x3501
#define OV8865_EXPOSURE_CTRL_H(v)		(((v) & GENMASK(15, 8)) >> 8)
#define OV8865_EXPOSURE_CTRL_L_REG		0x3502
#define OV8865_EXPOSURE_CTRL_L(v)		((v) & GENMASK(7, 0))
#define OV8865_EXPOSURE_GAIN_MANUAL_REG		0x3503

#define OV8865_GAIN_CTRL_H_REG			0x3508
#define OV8865_GAIN_CTRL_H(v)			(((v) & GENMASK(12, 8)) >> 8)
#define OV8865_GAIN_CTRL_L_REG			0x3509
#define OV8865_GAIN_CTRL_L(v)			((v) & GENMASK(7, 0))

/* Timing */

#define OV8865_CROP_START_X_H_REG		0x3800
#define OV8865_CROP_START_X_H(v)		(((v) & GENMASK(11, 8)) >> 8)
#define OV8865_CROP_START_X_L_REG		0x3801
#define OV8865_CROP_START_X_L(v)		((v) & GENMASK(7, 0))
#define OV8865_CROP_START_Y_H_REG		0x3802
#define OV8865_CROP_START_Y_H(v)		(((v) & GENMASK(11, 8)) >> 8)
#define OV8865_CROP_START_Y_L_REG		0x3803
#define OV8865_CROP_START_Y_L(v)		((v) & GENMASK(7, 0))
#define OV8865_CROP_END_X_H_REG			0x3804
#define OV8865_CROP_END_X_H(v)			(((v) & GENMASK(11, 8)) >> 8)
#define OV8865_CROP_END_X_L_REG			0x3805
#define OV8865_CROP_END_X_L(v)			((v) & GENMASK(7, 0))
#define OV8865_CROP_END_Y_H_REG			0x3806
#define OV8865_CROP_END_Y_H(v)			(((v) & GENMASK(11, 8)) >> 8)
#define OV8865_CROP_END_Y_L_REG			0x3807
#define OV8865_CROP_END_Y_L(v)			((v) & GENMASK(7, 0))
#define OV8865_OUTPUT_SIZE_X_H_REG		0x3808
#define OV8865_OUTPUT_SIZE_X_H(v)		(((v) & GENMASK(11, 8)) >> 8)
#define OV8865_OUTPUT_SIZE_X_L_REG		0x3809
#define OV8865_OUTPUT_SIZE_X_L(v)		((v) & GENMASK(7, 0))
#define OV8865_OUTPUT_SIZE_Y_H_REG		0x380a
#define OV8865_OUTPUT_SIZE_Y_H(v)		(((v) & GENMASK(11, 8)) >> 8)
#define OV8865_OUTPUT_SIZE_Y_L_REG		0x380b
#define OV8865_OUTPUT_SIZE_Y_L(v)		((v) & GENMASK(7, 0))
#define OV8865_HTS_H_REG			0x380c
#define OV8865_HTS_H(v)				(((v) & GENMASK(11, 8)) >> 8)
#define OV8865_HTS_L_REG			0x380d
#define OV8865_HTS_L(v)				((v) & GENMASK(7, 0))
#define OV8865_VTS_H_REG			0x380e
#define OV8865_VTS_H(v)				(((v) & GENMASK(11, 8)) >> 8)
#define OV8865_VTS_L_REG			0x380f
#define OV8865_VTS_L(v)				((v) & GENMASK(7, 0))
#define OV8865_OFFSET_X_H_REG			0x3810
#define OV8865_OFFSET_X_H(v)			(((v) & GENMASK(15, 8)) >> 8)
#define OV8865_OFFSET_X_L_REG			0x3811
#define OV8865_OFFSET_X_L(v)			((v) & GENMASK(7, 0))
#define OV8865_OFFSET_Y_H_REG			0x3812
#define OV8865_OFFSET_Y_H(v)			(((v) & GENMASK(14, 8)) >> 8)
#define OV8865_OFFSET_Y_L_REG			0x3813
#define OV8865_OFFSET_Y_L(v)			((v) & GENMASK(7, 0))
#define OV8865_INC_X_ODD_REG			0x3814
#define OV8865_INC_X_ODD(v)			((v) & GENMASK(4, 0))
#define OV8865_INC_X_EVEN_REG			0x3815
#define OV8865_INC_X_EVEN(v)			((v) & GENMASK(4, 0))
#define OV8865_VSYNC_START_H_REG		0x3816
#define OV8865_VSYNC_START_H(v)			(((v) & GENMASK(15, 8)) >> 8)
#define OV8865_VSYNC_START_L_REG		0x3817
#define OV8865_VSYNC_START_L(v)			((v) & GENMASK(7, 0))
#define OV8865_VSYNC_END_H_REG			0x3818
#define OV8865_VSYNC_END_H(v)			(((v) & GENMASK(15, 8)) >> 8)
#define OV8865_VSYNC_END_L_REG			0x3819
#define OV8865_VSYNC_END_L(v)			((v) & GENMASK(7, 0))
#define OV8865_HSYNC_FIRST_H_REG		0x381a
#define OV8865_HSYNC_FIRST_H(v)			(((v) & GENMASK(15, 8)) >> 8)
#define OV8865_HSYNC_FIRST_L_REG		0x381b
#define OV8865_HSYNC_FIRST_L(v)			((v) & GENMASK(7, 0))

#define OV8865_FORMAT1_REG			0x3820
#define OV8865_FORMAT1_FLIP_VERT_ISP_EN		BIT(2)
#define OV8865_FORMAT1_FLIP_VERT_SENSOR_EN	BIT(1)
#define OV8865_FORMAT2_REG			0x3821
#define OV8865_FORMAT2_HSYNC_EN			BIT(6)
#define OV8865_FORMAT2_FST_VBIN_EN		BIT(5)
#define OV8865_FORMAT2_FST_HBIN_EN		BIT(4)
#define OV8865_FORMAT2_ISP_HORZ_VAR2_EN		BIT(3)
#define OV8865_FORMAT2_FLIP_HORZ_ISP_EN		BIT(2)
#define OV8865_FORMAT2_FLIP_HORZ_SENSOR_EN	BIT(1)
#define OV8865_FORMAT2_SYNC_HBIN_EN		BIT(0)

#define OV8865_INC_Y_ODD_REG			0x382a
#define OV8865_INC_Y_ODD(v)			((v) & GENMASK(4, 0))
#define OV8865_INC_Y_EVEN_REG			0x382b
#define OV8865_INC_Y_EVEN(v)			((v) & GENMASK(4, 0))

#define OV8865_ABLC_NUM_REG			0x3830
#define OV8865_ABLC_NUM(v)			((v) & GENMASK(4, 0))

#define OV8865_ZLINE_NUM_REG			0x3836
#define OV8865_ZLINE_NUM(v)			((v) & GENMASK(4, 0))

#define OV8865_AUTO_SIZE_CTRL_REG		0x3841
#define OV8865_AUTO_SIZE_CTRL_OFFSET_Y_REG	BIT(5)
#define OV8865_AUTO_SIZE_CTRL_OFFSET_X_REG	BIT(4)
#define OV8865_AUTO_SIZE_CTRL_CROP_END_Y_REG	BIT(3)
#define OV8865_AUTO_SIZE_CTRL_CROP_END_X_REG	BIT(2)
#define OV8865_AUTO_SIZE_CTRL_CROP_START_Y_REG	BIT(1)
#define OV8865_AUTO_SIZE_CTRL_CROP_START_X_REG	BIT(0)
#define OV8865_AUTO_SIZE_X_OFFSET_H_REG		0x3842
#define OV8865_AUTO_SIZE_X_OFFSET_L_REG		0x3843
#define OV8865_AUTO_SIZE_Y_OFFSET_H_REG		0x3844
#define OV8865_AUTO_SIZE_Y_OFFSET_L_REG		0x3845
#define OV8865_AUTO_SIZE_BOUNDARIES_REG		0x3846
#define OV8865_AUTO_SIZE_BOUNDARIES_Y(v)	(((v) << 4) & GENMASK(7, 4))
#define OV8865_AUTO_SIZE_BOUNDARIES_X(v)	((v) & GENMASK(3, 0))

/* PSRAM */

#define OV8865_PSRAM_CTRL8_REG			0x3f08

/* Black Level */

#define OV8865_BLC_CTRL0_REG			0x4000
#define OV8865_BLC_CTRL0_TRIG_RANGE_EN		BIT(7)
#define OV8865_BLC_CTRL0_TRIG_FORMAT_EN		BIT(6)
#define OV8865_BLC_CTRL0_TRIG_GAIN_EN		BIT(5)
#define OV8865_BLC_CTRL0_TRIG_EXPOSURE_EN	BIT(4)
#define OV8865_BLC_CTRL0_TRIG_MANUAL_EN		BIT(3)
#define OV8865_BLC_CTRL0_FREEZE_EN		BIT(2)
#define OV8865_BLC_CTRL0_ALWAYS_EN		BIT(1)
#define OV8865_BLC_CTRL0_FILTER_EN		BIT(0)
#define OV8865_BLC_CTRL1_REG			0x4001
#define OV8865_BLC_CTRL1_DITHER_EN		BIT(7)
#define OV8865_BLC_CTRL1_ZERO_LINE_DIFF_EN	BIT(6)
#define OV8865_BLC_CTRL1_COL_SHIFT_256		(0 << 4)
#define OV8865_BLC_CTRL1_COL_SHIFT_128		(1 << 4)
#define OV8865_BLC_CTRL1_COL_SHIFT_64		(2 << 4)
#define OV8865_BLC_CTRL1_COL_SHIFT_32		(3 << 4)
#define OV8865_BLC_CTRL1_OFFSET_LIMIT_EN	BIT(2)
#define OV8865_BLC_CTRL1_COLUMN_CANCEL_EN	BIT(1)
#define OV8865_BLC_CTRL2_REG			0x4002
#define OV8865_BLC_CTRL3_REG			0x4003
#define OV8865_BLC_CTRL4_REG			0x4004
#define OV8865_BLC_CTRL5_REG			0x4005
#define OV8865_BLC_CTRL6_REG			0x4006
#define OV8865_BLC_CTRL7_REG			0x4007
#define OV8865_BLC_CTRL8_REG			0x4008
#define OV8865_BLC_CTRL9_REG			0x4009
#define OV8865_BLC_CTRLA_REG			0x400a
#define OV8865_BLC_CTRLB_REG			0x400b
#define OV8865_BLC_CTRLC_REG			0x400c
#define OV8865_BLC_CTRLD_REG			0x400d
#define OV8865_BLC_CTRLD_OFFSET_TRIGGER(v)	((v) & GENMASK(7, 0))

#define OV8865_BLC_CTRL1F_REG			0x401f
#define OV8865_BLC_CTRL1F_RB_REVERSE		BIT(3)
#define OV8865_BLC_CTRL1F_INTERPOL_X_EN		BIT(2)
#define OV8865_BLC_CTRL1F_INTERPOL_Y_EN		BIT(1)

#define OV8865_BLC_ANCHOR_LEFT_START_H_REG	0x4020
#define OV8865_BLC_ANCHOR_LEFT_START_H(v)	(((v) & GENMASK(11, 8)) >> 8)
#define OV8865_BLC_ANCHOR_LEFT_START_L_REG	0x4021
#define OV8865_BLC_ANCHOR_LEFT_START_L(v)	((v) & GENMASK(7, 0))
#define OV8865_BLC_ANCHOR_LEFT_END_H_REG	0x4022
#define OV8865_BLC_ANCHOR_LEFT_END_H(v)		(((v) & GENMASK(11, 8)) >> 8)
#define OV8865_BLC_ANCHOR_LEFT_END_L_REG	0x4023
#define OV8865_BLC_ANCHOR_LEFT_END_L(v)		((v) & GENMASK(7, 0))
#define OV8865_BLC_ANCHOR_RIGHT_START_H_REG	0x4024
#define OV8865_BLC_ANCHOR_RIGHT_START_H(v)	(((v) & GENMASK(11, 8)) >> 8)
#define OV8865_BLC_ANCHOR_RIGHT_START_L_REG	0x4025
#define OV8865_BLC_ANCHOR_RIGHT_START_L(v)	((v) & GENMASK(7, 0))
#define OV8865_BLC_ANCHOR_RIGHT_END_H_REG	0x4026
#define OV8865_BLC_ANCHOR_RIGHT_END_H(v)	(((v) & GENMASK(11, 8)) >> 8)
#define OV8865_BLC_ANCHOR_RIGHT_END_L_REG	0x4027
#define OV8865_BLC_ANCHOR_RIGHT_END_L(v)	((v) & GENMASK(7, 0))

#define OV8865_BLC_TOP_ZLINE_START_REG		0x4028
#define OV8865_BLC_TOP_ZLINE_START(v)		((v) & GENMASK(5, 0))
#define OV8865_BLC_TOP_ZLINE_NUM_REG		0x4029
#define OV8865_BLC_TOP_ZLINE_NUM(v)		((v) & GENMASK(4, 0))
#define OV8865_BLC_TOP_BLKLINE_START_REG	0x402a
#define OV8865_BLC_TOP_BLKLINE_START(v)		((v) & GENMASK(5, 0))
#define OV8865_BLC_TOP_BLKLINE_NUM_REG		0x402b
#define OV8865_BLC_TOP_BLKLINE_NUM(v)		((v) & GENMASK(4, 0))
#define OV8865_BLC_BOT_ZLINE_START_REG		0x402c
#define OV8865_BLC_BOT_ZLINE_START(v)		((v) & GENMASK(5, 0))
#define OV8865_BLC_BOT_ZLINE_NUM_REG		0x402d
#define OV8865_BLC_BOT_ZLINE_NUM(v)		((v) & GENMASK(4, 0))
#define OV8865_BLC_BOT_BLKLINE_START_REG	0x402e
#define OV8865_BLC_BOT_BLKLINE_START(v)		((v) & GENMASK(5, 0))
#define OV8865_BLC_BOT_BLKLINE_NUM_REG		0x402f
#define OV8865_BLC_BOT_BLKLINE_NUM(v)		((v) & GENMASK(4, 0))

#define OV8865_BLC_OFFSET_LIMIT_REG		0x4034
#define OV8865_BLC_OFFSET_LIMIT(v)		((v) & GENMASK(7, 0))

/* VFIFO */

#define OV8865_VFIFO_READ_START_H_REG		0x4600
#define OV8865_VFIFO_READ_START_H(v)		(((v) & GENMASK(15, 8)) >> 8)
#define OV8865_VFIFO_READ_START_L_REG		0x4601
#define OV8865_VFIFO_READ_START_L(v)		((v) & GENMASK(7, 0))

/* MIPI */

#define OV8865_MIPI_CTRL0_REG			0x4800
#define OV8865_MIPI_CTRL1_REG			0x4801
#define OV8865_MIPI_CTRL2_REG			0x4802
#define OV8865_MIPI_CTRL3_REG			0x4803
#define OV8865_MIPI_CTRL4_REG			0x4804
#define OV8865_MIPI_CTRL5_REG			0x4805
#define OV8865_MIPI_CTRL6_REG			0x4806
#define OV8865_MIPI_CTRL7_REG			0x4807
#define OV8865_MIPI_CTRL8_REG			0x4808

#define OV8865_MIPI_FCNT_MAX_H_REG		0x4810
#define OV8865_MIPI_FCNT_MAX_L_REG		0x4811

#define OV8865_MIPI_CTRL13_REG			0x4813
#define OV8865_MIPI_CTRL14_REG			0x4814
#define OV8865_MIPI_CTRL15_REG			0x4815
#define OV8865_MIPI_EMBEDDED_DT_REG		0x4816

#define OV8865_MIPI_HS_ZERO_MIN_H_REG		0x4818
#define OV8865_MIPI_HS_ZERO_MIN_L_REG		0x4819
#define OV8865_MIPI_HS_TRAIL_MIN_H_REG		0x481a
#define OV8865_MIPI_HS_TRAIL_MIN_L_REG		0x481b
#define OV8865_MIPI_CLK_ZERO_MIN_H_REG		0x481c
#define OV8865_MIPI_CLK_ZERO_MIN_L_REG		0x481d
#define OV8865_MIPI_CLK_PREPARE_MAX_REG		0x481e
#define OV8865_MIPI_CLK_PREPARE_MIN_REG		0x481f
#define OV8865_MIPI_CLK_POST_MIN_H_REG		0x4820
#define OV8865_MIPI_CLK_POST_MIN_L_REG		0x4821
#define OV8865_MIPI_CLK_TRAIL_MIN_H_REG		0x4822
#define OV8865_MIPI_CLK_TRAIL_MIN_L_REG		0x4823
#define OV8865_MIPI_LPX_P_MIN_H_REG		0x4824
#define OV8865_MIPI_LPX_P_MIN_L_REG		0x4825
#define OV8865_MIPI_HS_PREPARE_MIN_REG		0x4826
#define OV8865_MIPI_HS_PREPARE_MAX_REG		0x4827
#define OV8865_MIPI_HS_EXIT_MIN_H_REG		0x4828
#define OV8865_MIPI_HS_EXIT_MIN_L_REG		0x4829
#define OV8865_MIPI_UI_HS_ZERO_MIN_REG		0x482a
#define OV8865_MIPI_UI_HS_TRAIL_MIN_REG		0x482b
#define OV8865_MIPI_UI_CLK_ZERO_MIN_REG		0x482c
#define OV8865_MIPI_UI_CLK_PREPARE_REG		0x482d
#define OV8865_MIPI_UI_CLK_POST_MIN_REG		0x482e
#define OV8865_MIPI_UI_CLK_TRAIL_MIN_REG	0x482f
#define OV8865_MIPI_UI_LPX_P_MIN_REG		0x4830
#define OV8865_MIPI_UI_HS_PREPARE_REG		0x4831
#define OV8865_MIPI_UI_HS_EXIT_MIN_REG		0x4832
#define OV8865_MIPI_PKT_START_SIZE_REG		0x4833

#define OV8865_MIPI_PCLK_PERIOD_REG		0x4837
#define OV8865_MIPI_LP_GPIO0_REG		0x4838
#define OV8865_MIPI_LP_GPIO1_REG		0x4839

#define OV8865_MIPI_CTRL3C_REG			0x483c
#define OV8865_MIPI_LP_GPIO4_REG		0x483d

#define OV8865_MIPI_CTRL4A_REG			0x484a
#define OV8865_MIPI_CTRL4B_REG			0x484b
#define OV8865_MIPI_CTRL4C_REG			0x484c
#define OV8865_MIPI_LANE_TEST_PATTERN_REG	0x484d
#define OV8865_MIPI_FRAME_END_DELAY_REG		0x484e
#define OV8865_MIPI_CLOCK_TEST_PATTERN_REG	0x484f
#define OV8865_MIPI_LANE_SEL01_REG		0x4850
#define OV8865_MIPI_LANE_SEL01_LANE0(v)		(((v) << 0) & GENMASK(2, 0))
#define OV8865_MIPI_LANE_SEL01_LANE1(v)		(((v) << 4) & GENMASK(6, 4))
#define OV8865_MIPI_LANE_SEL23_REG		0x4851
#define OV8865_MIPI_LANE_SEL23_LANE2(v)		(((v) << 0) & GENMASK(2, 0))
#define OV8865_MIPI_LANE_SEL23_LANE3(v)		(((v) << 4) & GENMASK(6, 4))

/* ISP */

#define OV8865_ISP_CTRL0_REG			0x5000
#define OV8865_ISP_CTRL0_LENC_EN		BIT(7)
#define OV8865_ISP_CTRL0_WHITE_BALANCE_EN	BIT(4)
#define OV8865_ISP_CTRL0_DPC_BLACK_EN		BIT(2)
#define OV8865_ISP_CTRL0_DPC_WHITE_EN		BIT(1)
#define OV8865_ISP_CTRL1_REG			0x5001
#define OV8865_ISP_CTRL1_BLC_EN			BIT(0)
#define OV8865_ISP_CTRL2_REG			0x5002
#define OV8865_ISP_CTRL2_DEBUG			BIT(3)
#define OV8865_ISP_CTRL2_VARIOPIXEL_EN		BIT(2)
#define OV8865_ISP_CTRL2_VSYNC_LATCH_EN		BIT(0)
#define OV8865_ISP_CTRL3_REG			0x5003

#define OV8865_ISP_GAIN_RED_H_REG		0x5018
#define OV8865_ISP_GAIN_RED_H(v)		(((v) & GENMASK(13, 6)) >> 6)
#define OV8865_ISP_GAIN_RED_L_REG		0x5019
#define OV8865_ISP_GAIN_RED_L(v)		((v) & GENMASK(5, 0))
#define OV8865_ISP_GAIN_GREEN_H_REG		0x501a
#define OV8865_ISP_GAIN_GREEN_H(v)		(((v) & GENMASK(13, 6)) >> 6)
#define OV8865_ISP_GAIN_GREEN_L_REG		0x501b
#define OV8865_ISP_GAIN_GREEN_L(v)		((v) & GENMASK(5, 0))
#define OV8865_ISP_GAIN_BLUE_H_REG		0x501c
#define OV8865_ISP_GAIN_BLUE_H(v)		(((v) & GENMASK(13, 6)) >> 6)
#define OV8865_ISP_GAIN_BLUE_L_REG		0x501d
#define OV8865_ISP_GAIN_BLUE_L(v)		((v) & GENMASK(5, 0))

/* VarioPixel */

#define OV8865_VAP_CTRL0_REG			0x5900
#define OV8865_VAP_CTRL1_REG			0x5901
#define OV8865_VAP_CTRL1_HSUB_COEF(v)		((((v) - 1) << 2) & \
						 GENMASK(3, 2))
#define OV8865_VAP_CTRL1_VSUB_COEF(v)		(((v) - 1) & GENMASK(1, 0))

/* Pre-DSP */

#define OV8865_PRE_CTRL0_REG			0x5e00
#define OV8865_PRE_CTRL0_PATTERN_EN		BIT(7)
#define OV8865_PRE_CTRL0_ROLLING_BAR_EN		BIT(6)
#define OV8865_PRE_CTRL0_TRANSPARENT_MODE	BIT(5)
#define OV8865_PRE_CTRL0_SQUARES_BW_MODE	BIT(4)
#define OV8865_PRE_CTRL0_PATTERN_COLOR_BARS	0
#define OV8865_PRE_CTRL0_PATTERN_RANDOM_DATA	1
#define OV8865_PRE_CTRL0_PATTERN_COLOR_SQUARES	2
#define OV8865_PRE_CTRL0_PATTERN_BLACK		3

/* Macros */

#define ov8865_subdev_sensor(s) \
	container_of(s, struct ov8865_sensor, subdev)

#define ov8865_ctrl_subdev(c) \
	(&container_of((c)->handler, struct ov8865_sensor, \
		       ctrls.handler)->subdev)

/* Data structures */

struct ov8865_register_value {
	u16 address;
	u8 value;
	unsigned int delay_ms;
};

/*
 * PLL1 Clock Tree:
 *
 * +-< EXTCLK
 * |
 * +-+ pll_pre_div_half (0x30a [0])
 *   |
 *   +-+ pll_pre_div (0x300 [2:0], special values:
 *     |              0: 1, 1: 1.5, 3: 2.5, 4: 3, 5: 4, 7: 8)
 *     +-+ pll_mul (0x301 [1:0], 0x302 [7:0])
 *       |
 *       +-+ m_div (0x303 [3:0])
 *       | |
 *       | +-> PHY_SCLK
 *       | |
 *       | +-+ mipi_div (0x304 [1:0], special values: 0: 4, 1: 5, 2: 6, 3: 8)
 *       |   |
 *       |   +-+ pclk_div (0x3020 [3])
 *       |     |
 *       |     +-> PCLK
 *       |
 *       +-+ sys_pre_div (0x305 [1:0], special values: 0: 3, 1: 4, 2: 5, 3: 6)
 *         |
 *         +-+ sys_div (0x306 [0])
 *           |
 *           +-+ sys_sel (0x3032 [7], 0: PLL1, 1: PLL2)
 *             |
 *             +-+ sclk_sel (0x3033 [1], 0: sys_sel, 1: PLL2 DAC_CLK)
 *               |
 *               +-+ sclk_pre_div (0x3106 [3:2], special values:
 *                 |               0: 1, 1: 2, 2: 4, 3: 1)
 *                 |
 *                 +-+ sclk_div (0x3106 [7:4], special values: 0: 1)
 *                   |
 *                   +-> SCLK
 */

struct ov8865_pll1_config {
	unsigned int pll_pre_div_half;
	unsigned int pll_pre_div;
	unsigned int pll_mul;
	unsigned int m_div;
	unsigned int mipi_div;
	unsigned int pclk_div;
	unsigned int sys_pre_div;
	unsigned int sys_div;
};

/*
 * PLL2 Clock Tree:
 *
 * +-< EXTCLK
 * |
 * +-+ pll_pre_div_half (0x312 [4])
 *   |
 *   +-+ pll_pre_div (0x30b [2:0], special values:
 *     |              0: 1, 1: 1.5, 3: 2.5, 4: 3, 5: 4, 7: 8)
 *     +-+ pll_mul (0x30c [1:0], 0x30d [7:0])
 *       |
 *       +-+ dac_div (0x312 [3:0])
 *       | |
 *       | +-> DAC_CLK
 *       |
 *       +-+ sys_pre_div (0x30f [3:0])
 *         |
 *         +-+ sys_div (0x30e [2:0], special values:
 *           |          0: 1, 1: 1.5, 3: 2.5, 4: 3, 5: 3.5, 6: 4, 7:5)
 *           |
 *           +-+ sys_sel (0x3032 [7], 0: PLL1, 1: PLL2)
 *             |
 *             +-+ sclk_sel (0x3033 [1], 0: sys_sel, 1: PLL2 DAC_CLK)
 *               |
 *               +-+ sclk_pre_div (0x3106 [3:2], special values:
 *                 |               0: 1, 1: 2, 2: 4, 3: 1)
 *                 |
 *                 +-+ sclk_div (0x3106 [7:4], special values: 0: 1)
 *                   |
 *                   +-> SCLK
 */

struct ov8865_pll2_config {
	unsigned int pll_pre_div_half;
	unsigned int pll_pre_div;
	unsigned int pll_mul;
	unsigned int dac_div;
	unsigned int sys_pre_div;
	unsigned int sys_div;
};

struct ov8865_sclk_config {
	unsigned int sys_sel;
	unsigned int sclk_sel;
	unsigned int sclk_pre_div;
	unsigned int sclk_div;
};

/*
 * General formulas for (array-centered) mode calculation:
 * - photo_array_width = 3296
 * - crop_start_x = (photo_array_width - output_size_x) / 2
 * - crop_end_x = crop_start_x + offset_x + output_size_x - 1
 *
 * - photo_array_height = 2480
 * - crop_start_y = (photo_array_height - output_size_y) / 2
 * - crop_end_y = crop_start_y + offset_y + output_size_y - 1
 */

struct ov8865_mode {
	unsigned int crop_start_x;
	unsigned int offset_x;
	unsigned int output_size_x;
	unsigned int crop_end_x;
	unsigned int hts;

	unsigned int crop_start_y;
	unsigned int offset_y;
	unsigned int output_size_y;
	unsigned int crop_end_y;
	unsigned int vts;

	/* With auto size, only output and total sizes need to be set. */
	bool size_auto;
	unsigned int size_auto_boundary_x;
	unsigned int size_auto_boundary_y;

	bool binning_x;
	bool binning_y;
	bool variopixel;
	unsigned int variopixel_hsub_coef;
	unsigned int variopixel_vsub_coef;

	/* Bits for the format register, used for binning. */
	bool sync_hbin;
	bool horz_var2;

	unsigned int inc_x_odd;
	unsigned int inc_x_even;
	unsigned int inc_y_odd;
	unsigned int inc_y_even;

	unsigned int vfifo_read_start;

	unsigned int ablc_num;
	unsigned int zline_num;

	unsigned int blc_top_zero_line_start;
	unsigned int blc_top_zero_line_num;
	unsigned int blc_top_black_line_start;
	unsigned int blc_top_black_line_num;

	unsigned int blc_bottom_zero_line_start;
	unsigned int blc_bottom_zero_line_num;
	unsigned int blc_bottom_black_line_start;
	unsigned int blc_bottom_black_line_num;

	u8 blc_col_shift_mask;

	unsigned int blc_anchor_left_start;
	unsigned int blc_anchor_left_end;
	unsigned int blc_anchor_right_start;
	unsigned int blc_anchor_right_end;

	struct v4l2_fract frame_interval;

	const struct ov8865_pll1_config *pll1_config;
	const struct ov8865_pll2_config *pll2_config;
	const struct ov8865_sclk_config *sclk_config;

	const struct ov8865_register_value *register_values;
	unsigned int register_values_count;
};

struct ov8865_state {
	const struct ov8865_mode *mode;
	u32 mbus_code;

	bool streaming;
};

struct ov8865_ctrls {
	struct v4l2_ctrl *link_freq;
	struct v4l2_ctrl *pixel_rate;

	struct v4l2_ctrl_handler handler;
};

struct ov8865_sensor {
	struct device *dev;
	struct i2c_client *i2c_client;
	struct gpio_desc *reset;
	struct gpio_desc *powerdown;
	struct regulator *avdd;
	struct regulator *dvdd;
	struct regulator *dovdd;
	struct clk *extclk;

	struct v4l2_fwnode_endpoint endpoint;
	struct v4l2_subdev subdev;
	struct media_pad pad;

	struct mutex mutex;

	struct ov8865_state state;
	struct ov8865_ctrls ctrls;
};

/* Static definitions */

/*
 * EXTCLK = 24 MHz
 * PHY_SCLK = 720 MHz
 * MIPI_PCLK = 90 MHz
 */
static const struct ov8865_pll1_config ov8865_pll1_config_native = {
	.pll_pre_div_half	= 1,
	.pll_pre_div		= 0,
	.pll_mul		= 30,
	.m_div			= 1,
	.mipi_div		= 3,
	.pclk_div		= 1,
	.sys_pre_div		= 1,
	.sys_div		= 2,
};

/*
 * EXTCLK = 24 MHz
 * DAC_CLK = 360 MHz
 * SCLK = 144 MHz
 */

static const struct ov8865_pll2_config ov8865_pll2_config_native = {
	.pll_pre_div_half	= 1,
	.pll_pre_div		= 0,
	.pll_mul		= 30,
	.dac_div		= 2,
	.sys_pre_div		= 5,
	.sys_div		= 0,
};

/*
 * EXTCLK = 24 MHz
 * DAC_CLK = 360 MHz
 * SCLK = 80 MHz
 */

static const struct ov8865_pll2_config ov8865_pll2_config_binning = {
	.pll_pre_div_half	= 1,
	.pll_pre_div		= 0,
	.pll_mul		= 30,
	.dac_div		= 2,
	.sys_pre_div		= 10,
	.sys_div		= 0,
};

static const struct ov8865_sclk_config ov8865_sclk_config_native = {
	.sys_sel		= 1,
	.sclk_sel		= 0,
	.sclk_pre_div		= 0,
	.sclk_div		= 0,
};

static const struct ov8865_register_value ov8865_register_values_native[] = {
	/* Sensor */

	{ 0x3700, 0x48 },
	{ 0x3701, 0x18 },
	{ 0x3702, 0x50 },
	{ 0x3703, 0x32 },
	{ 0x3704, 0x28 },
	{ 0x3706, 0x70 },
	{ 0x3707, 0x08 },
	{ 0x3708, 0x48 },
	{ 0x3709, 0x80 },
	{ 0x370a, 0x01 },
	{ 0x370b, 0x70 },
	{ 0x370c, 0x07 },
	{ 0x3718, 0x14 },
	{ 0x3712, 0x44 },
	{ 0x371e, 0x31 },
	{ 0x371f, 0x7f },
	{ 0x3720, 0x0a },
	{ 0x3721, 0x0a },
	{ 0x3724, 0x04 },
	{ 0x3725, 0x04 },
	{ 0x3726, 0x0c },
	{ 0x3728, 0x0a },
	{ 0x3729, 0x03 },
	{ 0x372a, 0x06 },
	{ 0x372b, 0xa6 },
	{ 0x372c, 0xa6 },
	{ 0x372d, 0xa6 },
	{ 0x372e, 0x0c },
	{ 0x372f, 0x20 },
	{ 0x3730, 0x02 },
	{ 0x3731, 0x0c },
	{ 0x3732, 0x28 },
	{ 0x3736, 0x30 },
	{ 0x373a, 0x04 },
	{ 0x373b, 0x18 },
	{ 0x373c, 0x14 },
	{ 0x373e, 0x06 },
	{ 0x375a, 0x0c },
	{ 0x375b, 0x26 },
	{ 0x375d, 0x04 },
	{ 0x375f, 0x28 },
	{ 0x3767, 0x1e },
	{ 0x3772, 0x46 },
	{ 0x3773, 0x04 },
	{ 0x3774, 0x2c },
	{ 0x3775, 0x13 },
	{ 0x3776, 0x10 },
	{ 0x37a0, 0x88 },
	{ 0x37a1, 0x7a },
	{ 0x37a2, 0x7a },
	{ 0x37a3, 0x02 },
	{ 0x37a5, 0x09 },
	{ 0x37a7, 0x88 },
	{ 0x37a8, 0xb0 },
	{ 0x37a9, 0xb0 },
	{ 0x37aa, 0x88 },
	{ 0x37ab, 0x5c },
	{ 0x37ac, 0x5c },
	{ 0x37ad, 0x55 },
	{ 0x37ae, 0x19 },
	{ 0x37af, 0x19 },
	{ 0x37b3, 0x84 },
	{ 0x37b4, 0x84 },
	{ 0x37b5, 0x66 },

	/* PSRAM */

	{ OV8865_PSRAM_CTRL8_REG, 0x16 },

	/* ADC Sync */

	{ 0x4500, 0x68 },
};

static const struct ov8865_register_value ov8865_register_values_binning[] = {
	/* Sensor */

	{ 0x3700, 0x24 },
	{ 0x3701, 0x0c },
	{ 0x3702, 0x28 },
	{ 0x3703, 0x19 },
	{ 0x3704, 0x14 },
	{ 0x3706, 0x38 },
	{ 0x3707, 0x04 },
	{ 0x3708, 0x24 },
	{ 0x3709, 0x40 },
	{ 0x370a, 0x00 },
	{ 0x370b, 0xb8 },
	{ 0x370c, 0x04 },
	{ 0x3718, 0x12 },
	{ 0x3712, 0x42 },
	{ 0x371e, 0x19 },
	{ 0x371f, 0x40 },
	{ 0x3720, 0x05 },
	{ 0x3721, 0x05 },
	{ 0x3724, 0x02 },
	{ 0x3725, 0x02 },
	{ 0x3726, 0x06 },
	{ 0x3728, 0x05 },
	{ 0x3729, 0x02 },
	{ 0x372a, 0x03 },
	{ 0x372b, 0x53 },
	{ 0x372c, 0xa3 },
	{ 0x372d, 0x53 },
	{ 0x372e, 0x06 },
	{ 0x372f, 0x10 },
	{ 0x3730, 0x01 },
	{ 0x3731, 0x06 },
	{ 0x3732, 0x14 },
	{ 0x3736, 0x20 },
	{ 0x373a, 0x02 },
	{ 0x373b, 0x0c },
	{ 0x373c, 0x0a },
	{ 0x373e, 0x03 },
	{ 0x375a, 0x06 },
	{ 0x375b, 0x13 },
	{ 0x375d, 0x02 },
	{ 0x375f, 0x14 },
	{ 0x3767, 0x1c },
	{ 0x3772, 0x23 },
	{ 0x3773, 0x02 },
	{ 0x3774, 0x16 },
	{ 0x3775, 0x12 },
	{ 0x3776, 0x08 },
	{ 0x37a0, 0x44 },
	{ 0x37a1, 0x3d },
	{ 0x37a2, 0x3d },
	{ 0x37a3, 0x01 },
	{ 0x37a5, 0x08 },
	{ 0x37a7, 0x44 },
	{ 0x37a8, 0x58 },
	{ 0x37a9, 0x58 },
	{ 0x37aa, 0x44 },
	{ 0x37ab, 0x2e },
	{ 0x37ac, 0x2e },
	{ 0x37ad, 0x33 },
	{ 0x37ae, 0x0d },
	{ 0x37af, 0x0d },
	{ 0x37b3, 0x42 },
	{ 0x37b4, 0x42 },
	{ 0x37b5, 0x33 },

	/* PSRAM */

	{ OV8865_PSRAM_CTRL8_REG, 0x0b },

	/* ADC Sync */

	{ 0x4500, 0x40 },
};

static const struct ov8865_mode ov8865_modes[] = {
	/* 3264x2448 */
	{
		/* Horizontal */
		.output_size_x			= 3264,
		.hts				= 1944,

		/* Vertical */
		.output_size_y			= 2448,
		.vts				= 2470,

		.size_auto			= true,
		.size_auto_boundary_x		= 8,
		.size_auto_boundary_y		= 4,

		/* Subsample increase */
		.inc_x_odd			= 1,
		.inc_x_even			= 1,
		.inc_y_odd			= 1,
		.inc_y_even			= 1,

		/* VFIFO */
		.vfifo_read_start		= 16,

		.ablc_num			= 4,
		.zline_num			= 1,

		/* Black Level */

		.blc_top_zero_line_start	= 0,
		.blc_top_zero_line_num		= 2,
		.blc_top_black_line_start	= 4,
		.blc_top_black_line_num		= 4,

		.blc_bottom_zero_line_start	= 2,
		.blc_bottom_zero_line_num	= 2,
		.blc_bottom_black_line_start	= 8,
		.blc_bottom_black_line_num	= 2,

		.blc_anchor_left_start		= 576,
		.blc_anchor_left_end		= 831,
		.blc_anchor_right_start		= 1984,
		.blc_anchor_right_end		= 2239,

		/* Frame Interval */
		.frame_interval			= { 1, 30 },

		/* PLL */
		.pll1_config			= &ov8865_pll1_config_native,
		.pll2_config			= &ov8865_pll2_config_native,
		.sclk_config			= &ov8865_sclk_config_native,

		/* Registers */
		.register_values	= ov8865_register_values_native,
		.register_values_count	=
			ARRAY_SIZE(ov8865_register_values_native),
	},
	/* 3264x1836 */
	{
		/* Horizontal */
		.output_size_x			= 3264,
		.hts				= 2582,

		/* Vertical */
		.output_size_y			= 1836,
		.vts				= 2002,

		.size_auto			= true,
		.size_auto_boundary_x		= 8,
		.size_auto_boundary_y		= 4,

		/* Subsample increase */
		.inc_x_odd			= 1,
		.inc_x_even			= 1,
		.inc_y_odd			= 1,
		.inc_y_even			= 1,

		/* VFIFO */
		.vfifo_read_start		= 16,

		.ablc_num			= 4,
		.zline_num			= 1,

		/* Black Level */

		.blc_top_zero_line_start	= 0,
		.blc_top_zero_line_num		= 2,
		.blc_top_black_line_start	= 4,
		.blc_top_black_line_num		= 4,

		.blc_bottom_zero_line_start	= 2,
		.blc_bottom_zero_line_num	= 2,
		.blc_bottom_black_line_start	= 8,
		.blc_bottom_black_line_num	= 2,

		.blc_anchor_left_start		= 576,
		.blc_anchor_left_end		= 831,
		.blc_anchor_right_start		= 1984,
		.blc_anchor_right_end		= 2239,

		/* Frame Interval */
		.frame_interval			= { 1, 30 },

		/* PLL */
		.pll1_config			= &ov8865_pll1_config_native,
		.pll2_config			= &ov8865_pll2_config_native,
		.sclk_config			= &ov8865_sclk_config_native,

		/* Registers */
		.register_values	= ov8865_register_values_native,
		.register_values_count	=
			ARRAY_SIZE(ov8865_register_values_native),
	},
	/* 1632x1224 */
	{
		/* Horizontal */
		.output_size_x			= 1632,
		.hts				= 1923,

		/* Vertical */
		.output_size_y			= 1224,
		.vts				= 1248,

		.size_auto			= true,
		.size_auto_boundary_x		= 8,
		.size_auto_boundary_y		= 8,

		/* Subsample increase */
		.inc_x_odd			= 3,
		.inc_x_even			= 1,
		.inc_y_odd			= 3,
		.inc_y_even			= 1,

		/* Binning */
		.binning_y			= true,
		.sync_hbin			= true,

		/* VFIFO */
		.vfifo_read_start		= 116,

		.ablc_num			= 8,
		.zline_num			= 2,

		/* Black Level */

		.blc_top_zero_line_start	= 0,
		.blc_top_zero_line_num		= 2,
		.blc_top_black_line_start	= 4,
		.blc_top_black_line_num		= 4,

		.blc_bottom_zero_line_start	= 2,
		.blc_bottom_zero_line_num	= 2,
		.blc_bottom_black_line_start	= 8,
		.blc_bottom_black_line_num	= 2,

		.blc_anchor_left_start		= 288,
		.blc_anchor_left_end		= 415,
		.blc_anchor_right_start		= 992,
		.blc_anchor_right_end		= 1119,

		/* Frame Interval */
		.frame_interval			= { 1, 30 },

		/* PLL */
		.pll1_config			= &ov8865_pll1_config_native,
		.pll2_config			= &ov8865_pll2_config_binning,
		.sclk_config			= &ov8865_sclk_config_native,

		/* Registers */
		.register_values	= ov8865_register_values_binning,
		.register_values_count	=
			ARRAY_SIZE(ov8865_register_values_binning),
	},
	/* 800x600 (SVGA) */
	{
		/* Horizontal */
		.output_size_x			= 800,
		.hts				= 1250,

		/* Vertical */
		.output_size_y			= 600,
		.vts				= 640,

		.size_auto			= true,
		.size_auto_boundary_x		= 8,
		.size_auto_boundary_y		= 8,

		/* Subsample increase */
		.inc_x_odd			= 3,
		.inc_x_even			= 1,
		.inc_y_odd			= 5,
		.inc_y_even			= 3,

		/* Binning */
		.binning_y			= true,
		.variopixel			= true,
		.variopixel_hsub_coef		= 2,
		.variopixel_vsub_coef		= 1,
		.sync_hbin			= true,
		.horz_var2			= true,

		/* VFIFO */
		.vfifo_read_start		= 80,

		.ablc_num			= 8,
		.zline_num			= 2,

		/* Black Level */

		.blc_top_zero_line_start	= 0,
		.blc_top_zero_line_num		= 2,
		.blc_top_black_line_start	= 2,
		.blc_top_black_line_num		= 2,

		.blc_bottom_zero_line_start	= 0,
		.blc_bottom_zero_line_num	= 0,
		.blc_bottom_black_line_start	= 4,
		.blc_bottom_black_line_num	= 2,

		.blc_col_shift_mask	= OV8865_BLC_CTRL1_COL_SHIFT_128,

		.blc_anchor_left_start		= 288,
		.blc_anchor_left_end		= 415,
		.blc_anchor_right_start		= 992,
		.blc_anchor_right_end		= 1119,

		/* Frame Interval */
		.frame_interval			= { 1, 90 },

		/* PLL */
		.pll1_config			= &ov8865_pll1_config_native,
		.pll2_config			= &ov8865_pll2_config_binning,
		.sclk_config			= &ov8865_sclk_config_native,

		/* Registers */
		.register_values	= ov8865_register_values_binning,
		.register_values_count	=
			ARRAY_SIZE(ov8865_register_values_binning),
	},
};

static const u32 ov8865_mbus_codes[] = {
	MEDIA_BUS_FMT_SBGGR10_1X10,
};

static const struct ov8865_register_value ov8865_init_sequence[] = {
	/* Analog */

	{ 0x3604, 0x04 },
	{ 0x3602, 0x30 },
	{ 0x3605, 0x00 },
	{ 0x3607, 0x20 },
	{ 0x3608, 0x11 },
	{ 0x3609, 0x68 },
	{ 0x360a, 0x40 },
	{ 0x360c, 0xdd },
	{ 0x360e, 0x0c },
	{ 0x3610, 0x07 },
	{ 0x3612, 0x86 },
	{ 0x3613, 0x58 },
	{ 0x3614, 0x28 },
	{ 0x3617, 0x40 },
	{ 0x3618, 0x5a },
	{ 0x3619, 0x9b },
	{ 0x361c, 0x00 },
	{ 0x361d, 0x60 },
	{ 0x3631, 0x60 },
	{ 0x3633, 0x10 },
	{ 0x3634, 0x10 },
	{ 0x3635, 0x10 },
	{ 0x3636, 0x10 },
	{ 0x3638, 0xff },
	{ 0x3641, 0x55 },
	{ 0x3646, 0x86 },
	{ 0x3647, 0x27 },
	{ 0x364a, 0x1b },

	/* Sensor */

	{ 0x3700, 0x24 },
	{ 0x3701, 0x0c },
	{ 0x3702, 0x28 },
	{ 0x3703, 0x19 },
	{ 0x3704, 0x14 },
	{ 0x3705, 0x00 },
	{ 0x3706, 0x38 },
	{ 0x3707, 0x04 },
	{ 0x3708, 0x24 },
	{ 0x3709, 0x40 },
	{ 0x370a, 0x00 },
	{ 0x370b, 0xb8 },
	{ 0x370c, 0x04 },
	{ 0x3718, 0x12 },
	{ 0x3719, 0x31 },
	{ 0x3712, 0x42 },
	{ 0x3714, 0x12 },
	{ 0x371e, 0x19 },
	{ 0x371f, 0x40 },
	{ 0x3720, 0x05 },
	{ 0x3721, 0x05 },
	{ 0x3724, 0x02 },
	{ 0x3725, 0x02 },
	{ 0x3726, 0x06 },
	{ 0x3728, 0x05 },
	{ 0x3729, 0x02 },
	{ 0x372a, 0x03 },
	{ 0x372b, 0x53 },
	{ 0x372c, 0xa3 },
	{ 0x372d, 0x53 },
	{ 0x372e, 0x06 },
	{ 0x372f, 0x10 },
	{ 0x3730, 0x01 },
	{ 0x3731, 0x06 },
	{ 0x3732, 0x14 },
	{ 0x3733, 0x10 },
	{ 0x3734, 0x40 },
	{ 0x3736, 0x20 },
	{ 0x373a, 0x02 },
	{ 0x373b, 0x0c },
	{ 0x373c, 0x0a },
	{ 0x373e, 0x03 },
	{ 0x3755, 0x40 },
	{ 0x3758, 0x00 },
	{ 0x3759, 0x4c },
	{ 0x375a, 0x06 },
	{ 0x375b, 0x13 },
	{ 0x375c, 0x40 },
	{ 0x375d, 0x02 },
	{ 0x375e, 0x00 },
	{ 0x375f, 0x14 },
	{ 0x3767, 0x1c },
	{ 0x3768, 0x04 },
	{ 0x3769, 0x20 },
	{ 0x376c, 0xc0 },
	{ 0x376d, 0xc0 },
	{ 0x376a, 0x08 },
	{ 0x3761, 0x00 },
	{ 0x3762, 0x00 },
	{ 0x3763, 0x00 },
	{ 0x3766, 0xff },
	{ 0x376b, 0x42 },
	{ 0x3772, 0x23 },
	{ 0x3773, 0x02 },
	{ 0x3774, 0x16 },
	{ 0x3775, 0x12 },
	{ 0x3776, 0x08 },
	{ 0x37a0, 0x44 },
	{ 0x37a1, 0x3d },
	{ 0x37a2, 0x3d },
	{ 0x37a3, 0x01 },
	{ 0x37a4, 0x00 },
	{ 0x37a5, 0x08 },
	{ 0x37a6, 0x00 },
	{ 0x37a7, 0x44 },
	{ 0x37a8, 0x58 },
	{ 0x37a9, 0x58 },
	{ 0x3760, 0x00 },
	{ 0x376f, 0x01 },
	{ 0x37aa, 0x44 },
	{ 0x37ab, 0x2e },
	{ 0x37ac, 0x2e },
	{ 0x37ad, 0x33 },
	{ 0x37ae, 0x0d },
	{ 0x37af, 0x0d },
	{ 0x37b0, 0x00 },
	{ 0x37b1, 0x00 },
	{ 0x37b2, 0x00 },
	{ 0x37b3, 0x42 },
	{ 0x37b4, 0x42 },
	{ 0x37b5, 0x33 },
	{ 0x37b6, 0x00 },
	{ 0x37b7, 0x00 },
	{ 0x37b8, 0x00 },
	{ 0x37b9, 0xff },

	/* ADC Sync */

	{ 0x4503, 0x10 },
};

static const s64 ov8865_link_freq_menu[] = {
	360000000,
};

static const char *const ov8865_test_pattern_menu[] = {
	"Disabled",
	"Random data",
	"Color bars",
	"Color bars with rolling bar",
	"Color squares",
	"Color squares with rolling bar"
};

static const u8 ov8865_test_pattern_bits[] = {
	0,
	OV8865_PRE_CTRL0_PATTERN_EN | OV8865_PRE_CTRL0_PATTERN_RANDOM_DATA,
	OV8865_PRE_CTRL0_PATTERN_EN | OV8865_PRE_CTRL0_PATTERN_COLOR_BARS,
	OV8865_PRE_CTRL0_PATTERN_EN | OV8865_PRE_CTRL0_ROLLING_BAR_EN |
	OV8865_PRE_CTRL0_PATTERN_COLOR_BARS,
	OV8865_PRE_CTRL0_PATTERN_EN | OV8865_PRE_CTRL0_PATTERN_COLOR_SQUARES,
	OV8865_PRE_CTRL0_PATTERN_EN | OV8865_PRE_CTRL0_ROLLING_BAR_EN |
	OV8865_PRE_CTRL0_PATTERN_COLOR_SQUARES,
};

/* Input/Output */

static int ov8865_read(struct ov8865_sensor *sensor, u16 address, u8 *value)
{
	unsigned char data[2] = { address >> 8, address & 0xff };
	struct i2c_client *client = sensor->i2c_client;
	int ret;

	ret = i2c_master_send(client, data, sizeof(data));
	if (ret < 0) {
		dev_dbg(&client->dev, "i2c send error at address %#04x\n",
			address);
		return ret;
	}

	ret = i2c_master_recv(client, value, 1);
	if (ret < 0) {
		dev_dbg(&client->dev, "i2c recv error at address %#04x\n",
			address);
		return ret;
	}

	return 0;
}

static int ov8865_write(struct ov8865_sensor *sensor, u16 address, u8 value)
{
	unsigned char data[3] = { address >> 8, address & 0xff, value };
	struct i2c_client *client = sensor->i2c_client;
	int ret;

	ret = i2c_master_send(client, data, sizeof(data));
	if (ret < 0) {
		dev_dbg(&client->dev, "i2c send error at address %#04x\n",
			address);
		return ret;
	}

	return 0;
}

static int ov8865_write_sequence(struct ov8865_sensor *sensor,
				 const struct ov8865_register_value *sequence,
				 unsigned int sequence_count)
{
	unsigned int i;
	int ret = 0;

	for (i = 0; i < sequence_count; i++) {
		ret = ov8865_write(sensor, sequence[i].address,
				   sequence[i].value);
		if (ret)
			break;

		if (sequence[i].delay_ms)
			msleep(sequence[i].delay_ms);
	}

	return ret;
}

static int ov8865_update_bits(struct ov8865_sensor *sensor, u16 address,
			      u8 mask, u8 bits)
{
	u8 value = 0;
	int ret;

	ret = ov8865_read(sensor, address, &value);
	if (ret)
		return ret;

	value &= ~mask;
	value |= bits;

	return ov8865_write(sensor, address, value);
}

/* Sensor */

static int ov8865_sw_reset(struct ov8865_sensor *sensor)
{
	return ov8865_write(sensor, OV8865_SW_RESET_REG, OV8865_SW_RESET_RESET);
}

static int ov8865_sw_standby(struct ov8865_sensor *sensor, int standby)
{
	u8 value = 0;

	if (!standby)
		value = OV8865_SW_STANDBY_STREAM_ON;

	return ov8865_write(sensor, OV8865_SW_STANDBY_REG, value);
}

static int ov8865_chip_id_check(struct ov8865_sensor *sensor)
{
	u16 regs[] = { OV8865_CHIP_ID_HH_REG, OV8865_CHIP_ID_H_REG,
		       OV8865_CHIP_ID_L_REG };
	u8 values[] = { OV8865_CHIP_ID_HH_VALUE, OV8865_CHIP_ID_H_VALUE,
			OV8865_CHIP_ID_L_VALUE };
	unsigned int i;
	u8 value;
	int ret;

	for (i = 0; i < ARRAY_SIZE(regs); i++) {
		ret = ov8865_read(sensor, regs[i], &value);
		if (ret < 0)
			return ret;

		if (value != values[i]) {
			dev_err(sensor->dev,
				"chip id value mismatch: %#x instead of %#x\n",
				value, values[i]);
			return -EINVAL;
		}
	}

	return 0;
}

static int ov8865_charge_pump_configure(struct ov8865_sensor *sensor)
{
	return ov8865_write(sensor, OV8865_PUMP_CLK_DIV_REG,
			    OV8865_PUMP_CLK_DIV_PUMP_P(1));
}

static int ov8865_mipi_configure(struct ov8865_sensor *sensor)
{
	struct v4l2_fwnode_bus_mipi_csi2 *bus_mipi_csi2 =
		&sensor->endpoint.bus.mipi_csi2;
	unsigned int lanes_count = bus_mipi_csi2->num_data_lanes;
	int ret;

	ret = ov8865_write(sensor, OV8865_MIPI_SC_CTRL0_REG,
			   OV8865_MIPI_SC_CTRL0_LANES(lanes_count) |
			   OV8865_MIPI_SC_CTRL0_MIPI_EN |
			   OV8865_MIPI_SC_CTRL0_UNKNOWN);
	if (ret)
		return ret;

	ret = ov8865_write(sensor, OV8865_MIPI_SC_CTRL2_REG,
			   OV8865_MIPI_SC_CTRL2_PD_MIPI_RST_SYNC);
	if (ret)
		return ret;

	if (lanes_count >= 2) {
		ret = ov8865_write(sensor, OV8865_MIPI_LANE_SEL01_REG,
				   OV8865_MIPI_LANE_SEL01_LANE0(0) |
				   OV8865_MIPI_LANE_SEL01_LANE1(1));
		if (ret)
			return ret;
	}

	if (lanes_count >= 4) {
		ret = ov8865_write(sensor, OV8865_MIPI_LANE_SEL23_REG,
				   OV8865_MIPI_LANE_SEL23_LANE2(2) |
				   OV8865_MIPI_LANE_SEL23_LANE3(3));
		if (ret)
			return ret;
	}

	ret = ov8865_update_bits(sensor, OV8865_CLK_SEL1_REG,
				 OV8865_CLK_SEL1_MIPI_EOF,
				 OV8865_CLK_SEL1_MIPI_EOF);
	if (ret)
		return ret;

	/*
	 * This value might need to change depending on PCLK rate,
	 * but it's unclear how. This value seems to generally work
	 * while the default value was found to cause transmission errors.
	 */
	return ov8865_write(sensor, OV8865_MIPI_PCLK_PERIOD_REG, 0x16);
}

static int ov8865_black_level_configure(struct ov8865_sensor *sensor)
{
	int ret;

	/* Trigger BLC on relevant events and enable filter. */
	ret = ov8865_write(sensor, OV8865_BLC_CTRL0_REG,
			   OV8865_BLC_CTRL0_TRIG_RANGE_EN |
			   OV8865_BLC_CTRL0_TRIG_FORMAT_EN |
			   OV8865_BLC_CTRL0_TRIG_GAIN_EN |
			   OV8865_BLC_CTRL0_TRIG_EXPOSURE_EN |
			   OV8865_BLC_CTRL0_FILTER_EN);
	if (ret)
		return ret;

	/* Lower BLC offset trigger threshold. */
	ret = ov8865_write(sensor, OV8865_BLC_CTRLD_REG,
			   OV8865_BLC_CTRLD_OFFSET_TRIGGER(16));
	if (ret)
		return ret;

	ret = ov8865_write(sensor, OV8865_BLC_CTRL1F_REG, 0);
	if (ret)
		return ret;

	/* Increase BLC offset maximum limit. */
	return ov8865_write(sensor, OV8865_BLC_OFFSET_LIMIT_REG,
			    OV8865_BLC_OFFSET_LIMIT(63));
}

static int ov8865_isp_configure(struct ov8865_sensor *sensor)
{
	int ret;

	/* Disable lens correction. */
	ret = ov8865_write(sensor, OV8865_ISP_CTRL0_REG,
			   OV8865_ISP_CTRL0_WHITE_BALANCE_EN |
			   OV8865_ISP_CTRL0_DPC_BLACK_EN |
			   OV8865_ISP_CTRL0_DPC_WHITE_EN);
	if (ret)
		return ret;

	return ov8865_write(sensor, OV8865_ISP_CTRL1_REG,
			    OV8865_ISP_CTRL1_BLC_EN);
}

static unsigned long ov8865_mode_pll1_rate(struct ov8865_sensor *sensor,
					   const struct ov8865_mode *mode)
{
	const struct ov8865_pll1_config *config = mode->pll1_config;
	unsigned long extclk_rate;
	unsigned long pll1_rate;

	extclk_rate = clk_get_rate(sensor->extclk);
	pll1_rate = extclk_rate * config->pll_mul / config->pll_pre_div_half;

	switch (config->pll_pre_div) {
	case 0:
		break;
	case 1:
		pll1_rate *= 3;
		pll1_rate /= 2;
		break;
	case 3:
		pll1_rate *= 5;
		pll1_rate /= 2;
		break;
	case 4:
		pll1_rate /= 3;
		break;
	case 5:
		pll1_rate /= 4;
		break;
	case 7:
		pll1_rate /= 8;
		break;
	default:
		pll1_rate /= config->pll_pre_div;
		break;
	}

	return pll1_rate;
}

static int ov8865_mode_pll1_configure(struct ov8865_sensor *sensor,
				      const struct ov8865_mode *mode,
				      u32 mbus_code)
{
	const struct ov8865_pll1_config *config = mode->pll1_config;
	u8 value;
	int ret;

	switch (mbus_code) {
	case MEDIA_BUS_FMT_SBGGR10_1X10:
		value = OV8865_MIPI_BIT_SEL(10);
		break;
	default:
		return -EINVAL;
	}

	ret = ov8865_write(sensor, OV8865_MIPI_BIT_SEL_REG, value);
	if (ret)
		return ret;

	ret = ov8865_write(sensor, OV8865_PLL_CTRLA_REG,
			   OV8865_PLL_CTRLA_PRE_DIV_HALF(config->pll_pre_div_half));
	if (ret)
		return ret;

	ret = ov8865_write(sensor, OV8865_PLL_CTRL0_REG,
			   OV8865_PLL_CTRL0_PRE_DIV(config->pll_pre_div));
	if (ret)
		return ret;

	ret = ov8865_write(sensor, OV8865_PLL_CTRL1_REG,
			   OV8865_PLL_CTRL1_MUL_H(config->pll_mul));
	if (ret)
		return ret;

	ret = ov8865_write(sensor, OV8865_PLL_CTRL2_REG,
			   OV8865_PLL_CTRL2_MUL_L(config->pll_mul));
	if (ret)
		return ret;

	ret = ov8865_write(sensor, OV8865_PLL_CTRL3_REG,
			   OV8865_PLL_CTRL3_M_DIV(config->m_div));
	if (ret)
		return ret;

	ret = ov8865_write(sensor, OV8865_PLL_CTRL4_REG,
			   OV8865_PLL_CTRL4_MIPI_DIV(config->mipi_div));
	if (ret)
		return ret;

	ret = ov8865_update_bits(sensor, OV8865_PCLK_SEL_REG,
				 OV8865_PCLK_SEL_PCLK_DIV_MASK,
				 OV8865_PCLK_SEL_PCLK_DIV(config->pclk_div));
	if (ret)
		return ret;

	ret = ov8865_write(sensor, OV8865_PLL_CTRL5_REG,
			   OV8865_PLL_CTRL5_SYS_PRE_DIV(config->sys_pre_div));
	if (ret)
		return ret;

	ret = ov8865_write(sensor, OV8865_PLL_CTRL6_REG,
			   OV8865_PLL_CTRL6_SYS_DIV(config->sys_div));
	if (ret)
		return ret;

	return ov8865_update_bits(sensor, OV8865_PLL_CTRL1E_REG,
				  OV8865_PLL_CTRL1E_PLL1_NO_LAT,
				  OV8865_PLL_CTRL1E_PLL1_NO_LAT);
}

static int ov8865_mode_pll2_configure(struct ov8865_sensor *sensor,
				      const struct ov8865_mode *mode)
{
	const struct ov8865_pll2_config *config = mode->pll2_config;
	int ret;

	ret = ov8865_write(sensor, OV8865_PLL_CTRL12_REG,
			   OV8865_PLL_CTRL12_PRE_DIV_HALF(config->pll_pre_div_half) |
			   OV8865_PLL_CTRL12_DAC_DIV(config->dac_div));
	if (ret)
		return ret;

	ret = ov8865_write(sensor, OV8865_PLL_CTRLB_REG,
			   OV8865_PLL_CTRLB_PRE_DIV(config->pll_pre_div));
	if (ret)
		return ret;

	ret = ov8865_write(sensor, OV8865_PLL_CTRLC_REG,
			   OV8865_PLL_CTRLC_MUL_H(config->pll_mul));
	if (ret)
		return ret;

	ret = ov8865_write(sensor, OV8865_PLL_CTRLD_REG,
			   OV8865_PLL_CTRLD_MUL_L(config->pll_mul));
	if (ret)
		return ret;

	ret = ov8865_write(sensor, OV8865_PLL_CTRLF_REG,
			   OV8865_PLL_CTRLF_SYS_PRE_DIV(config->sys_pre_div));
	if (ret)
		return ret;

	return ov8865_write(sensor, OV8865_PLL_CTRLE_REG,
			    OV8865_PLL_CTRLE_SYS_DIV(config->sys_div));
}

static int ov8865_mode_sclk_configure(struct ov8865_sensor *sensor,
				      const struct ov8865_mode *mode)
{
	const struct ov8865_sclk_config *config = mode->sclk_config;
	int ret;

	ret = ov8865_write(sensor, OV8865_CLK_SEL0_REG,
			   OV8865_CLK_SEL0_PLL1_SYS_SEL(config->sys_sel));
	if (ret)
		return ret;

	ret = ov8865_update_bits(sensor, OV8865_CLK_SEL1_REG,
				 OV8865_CLK_SEL1_PLL_SCLK_SEL_MASK,
				 OV8865_CLK_SEL1_PLL_SCLK_SEL(config->sclk_sel));
	if (ret)
		return ret;

	return ov8865_write(sensor, OV8865_SCLK_CTRL_REG,
			    OV8865_SCLK_CTRL_UNKNOWN |
			    OV8865_SCLK_CTRL_SCLK_DIV(config->sclk_div) |
			    OV8865_SCLK_CTRL_SCLK_PRE_DIV(config->sclk_pre_div));
}

static int ov8865_mode_binning_configure(struct ov8865_sensor *sensor,
					 const struct ov8865_mode *mode)
{
	unsigned int variopixel_hsub_coef, variopixel_vsub_coef;
	u8 value;
	int ret;

	ret = ov8865_write(sensor, OV8865_FORMAT1_REG, 0);
	if (ret)
		return ret;

	value = OV8865_FORMAT2_HSYNC_EN;

	if (mode->binning_x)
		value |= OV8865_FORMAT2_FST_HBIN_EN;

	if (mode->binning_y)
		value |= OV8865_FORMAT2_FST_VBIN_EN;

	if (mode->sync_hbin)
		value |= OV8865_FORMAT2_SYNC_HBIN_EN;

	if (mode->horz_var2)
		value |= OV8865_FORMAT2_ISP_HORZ_VAR2_EN;

	ret = ov8865_write(sensor, OV8865_FORMAT2_REG, value);
	if (ret)
		return ret;

	ret = ov8865_update_bits(sensor, OV8865_ISP_CTRL2_REG,
				 OV8865_ISP_CTRL2_VARIOPIXEL_EN,
				 mode->variopixel ?
				 OV8865_ISP_CTRL2_VARIOPIXEL_EN : 0);
	if (ret)
		return ret;

	if (mode->variopixel) {
		/* VarioPixel coefs needs to be > 1. */
		variopixel_hsub_coef = mode->variopixel_hsub_coef;
		variopixel_vsub_coef = mode->variopixel_vsub_coef;
	} else {
		variopixel_hsub_coef = 1;
		variopixel_vsub_coef = 1;
	}

	ret = ov8865_write(sensor, OV8865_VAP_CTRL1_REG,
			   OV8865_VAP_CTRL1_HSUB_COEF(variopixel_hsub_coef) |
			   OV8865_VAP_CTRL1_VSUB_COEF(variopixel_vsub_coef));
	if (ret)
		return ret;

	ret = ov8865_write(sensor, OV8865_INC_X_ODD_REG,
			   OV8865_INC_X_ODD(mode->inc_x_odd));
	if (ret)
		return ret;

	ret = ov8865_write(sensor, OV8865_INC_X_EVEN_REG,
			   OV8865_INC_X_EVEN(mode->inc_x_even));
	if (ret)
		return ret;

	ret = ov8865_write(sensor, OV8865_INC_Y_ODD_REG,
			   OV8865_INC_Y_ODD(mode->inc_y_odd));
	if (ret)
		return ret;

	return ov8865_write(sensor, OV8865_INC_Y_EVEN_REG,
			    OV8865_INC_Y_EVEN(mode->inc_y_even));
}

static int ov8865_mode_black_level_configure(struct ov8865_sensor *sensor,
					     const struct ov8865_mode *mode)
{
	int ret;

	/* Note that a zero value for blc_col_shift_mask is the default 256. */
	ret = ov8865_write(sensor, OV8865_BLC_CTRL1_REG,
			   mode->blc_col_shift_mask |
			   OV8865_BLC_CTRL1_OFFSET_LIMIT_EN);
	if (ret)
		return ret;

	/* BLC top zero line */

	ret = ov8865_write(sensor, OV8865_BLC_TOP_ZLINE_START_REG,
			   OV8865_BLC_TOP_ZLINE_START(mode->blc_top_zero_line_start));
	if (ret)
		return ret;

	ret = ov8865_write(sensor, OV8865_BLC_TOP_ZLINE_NUM_REG,
			   OV8865_BLC_TOP_ZLINE_NUM(mode->blc_top_zero_line_num));
	if (ret)
		return ret;

	/* BLC top black line */

	ret = ov8865_write(sensor, OV8865_BLC_TOP_BLKLINE_START_REG,
			   OV8865_BLC_TOP_BLKLINE_START(mode->blc_top_black_line_start));
	if (ret)
		return ret;

	ret = ov8865_write(sensor, OV8865_BLC_TOP_BLKLINE_NUM_REG,
			   OV8865_BLC_TOP_BLKLINE_NUM(mode->blc_top_black_line_num));
	if (ret)
		return ret;

	/* BLC bottom zero line */

	ret = ov8865_write(sensor, OV8865_BLC_BOT_ZLINE_START_REG,
			   OV8865_BLC_BOT_ZLINE_START(mode->blc_bottom_zero_line_start));
	if (ret)
		return ret;

	ret = ov8865_write(sensor, OV8865_BLC_BOT_ZLINE_NUM_REG,
			   OV8865_BLC_BOT_ZLINE_NUM(mode->blc_bottom_zero_line_num));
	if (ret)
		return ret;

	/* BLC bottom black line */

	ret = ov8865_write(sensor, OV8865_BLC_BOT_BLKLINE_START_REG,
			   OV8865_BLC_BOT_BLKLINE_START(mode->blc_bottom_black_line_start));
	if (ret)
		return ret;

	ret = ov8865_write(sensor, OV8865_BLC_BOT_BLKLINE_NUM_REG,
			   OV8865_BLC_BOT_BLKLINE_NUM(mode->blc_bottom_black_line_num));
	if (ret)
		return ret;

	/* BLC anchor */

	ret = ov8865_write(sensor, OV8865_BLC_ANCHOR_LEFT_START_H_REG,
			   OV8865_BLC_ANCHOR_LEFT_START_H(mode->blc_anchor_left_start));
	if (ret)
		return ret;

	ret = ov8865_write(sensor, OV8865_BLC_ANCHOR_LEFT_START_L_REG,
			   OV8865_BLC_ANCHOR_LEFT_START_L(mode->blc_anchor_left_start));
	if (ret)
		return ret;

	ret = ov8865_write(sensor, OV8865_BLC_ANCHOR_LEFT_END_H_REG,
			   OV8865_BLC_ANCHOR_LEFT_END_H(mode->blc_anchor_left_end));
	if (ret)
		return ret;

	ret = ov8865_write(sensor, OV8865_BLC_ANCHOR_LEFT_END_L_REG,
			   OV8865_BLC_ANCHOR_LEFT_END_L(mode->blc_anchor_left_end));
	if (ret)
		return ret;

	ret = ov8865_write(sensor, OV8865_BLC_ANCHOR_RIGHT_START_H_REG,
			   OV8865_BLC_ANCHOR_RIGHT_START_H(mode->blc_anchor_right_start));
	if (ret)
		return ret;

	ret = ov8865_write(sensor, OV8865_BLC_ANCHOR_RIGHT_START_L_REG,
			   OV8865_BLC_ANCHOR_RIGHT_START_L(mode->blc_anchor_right_start));
	if (ret)
		return ret;

	ret = ov8865_write(sensor, OV8865_BLC_ANCHOR_RIGHT_END_H_REG,
			   OV8865_BLC_ANCHOR_RIGHT_END_H(mode->blc_anchor_right_end));
	if (ret)
		return ret;

	return ov8865_write(sensor, OV8865_BLC_ANCHOR_RIGHT_END_L_REG,
			    OV8865_BLC_ANCHOR_RIGHT_END_L(mode->blc_anchor_right_end));
}

static int ov8865_mode_configure(struct ov8865_sensor *sensor,
				 const struct ov8865_mode *mode, u32 mbus_code)
{
	int ret;

	/* Output Size X */

	ret = ov8865_write(sensor, OV8865_OUTPUT_SIZE_X_H_REG,
			   OV8865_OUTPUT_SIZE_X_H(mode->output_size_x));
	if (ret)
		return ret;

	ret = ov8865_write(sensor, OV8865_OUTPUT_SIZE_X_L_REG,
			   OV8865_OUTPUT_SIZE_X_L(mode->output_size_x));
	if (ret)
		return ret;

	/* Horizontal Total Size */

	ret = ov8865_write(sensor, OV8865_HTS_H_REG, OV8865_HTS_H(mode->hts));
	if (ret)
		return ret;

	ret = ov8865_write(sensor, OV8865_HTS_L_REG, OV8865_HTS_L(mode->hts));
	if (ret)
		return ret;

	/* Output Size Y */

	ret = ov8865_write(sensor, OV8865_OUTPUT_SIZE_Y_H_REG,
			   OV8865_OUTPUT_SIZE_Y_H(mode->output_size_y));
	if (ret)
		return ret;

	ret = ov8865_write(sensor, OV8865_OUTPUT_SIZE_Y_L_REG,
			   OV8865_OUTPUT_SIZE_Y_L(mode->output_size_y));
	if (ret)
		return ret;

	/* Vertical Total Size */

	ret = ov8865_write(sensor, OV8865_VTS_H_REG, OV8865_VTS_H(mode->vts));
	if (ret)
		return ret;

	ret = ov8865_write(sensor, OV8865_VTS_L_REG, OV8865_VTS_L(mode->vts));
	if (ret)
		return ret;

	if (mode->size_auto) {
		/* Auto Size */

		ret = ov8865_write(sensor, OV8865_AUTO_SIZE_CTRL_REG,
				   OV8865_AUTO_SIZE_CTRL_OFFSET_Y_REG |
				   OV8865_AUTO_SIZE_CTRL_OFFSET_X_REG |
				   OV8865_AUTO_SIZE_CTRL_CROP_END_Y_REG |
				   OV8865_AUTO_SIZE_CTRL_CROP_END_X_REG |
				   OV8865_AUTO_SIZE_CTRL_CROP_START_Y_REG |
				   OV8865_AUTO_SIZE_CTRL_CROP_START_X_REG);
		if (ret)
			return ret;

		ret = ov8865_write(sensor, OV8865_AUTO_SIZE_BOUNDARIES_REG,
				   OV8865_AUTO_SIZE_BOUNDARIES_Y(mode->size_auto_boundary_y) |
				   OV8865_AUTO_SIZE_BOUNDARIES_X(mode->size_auto_boundary_x));
		if (ret)
			return ret;
	} else {
		/* Crop Start X */

		ret = ov8865_write(sensor, OV8865_CROP_START_X_H_REG,
				   OV8865_CROP_START_X_H(mode->crop_start_x));
		if (ret)
			return ret;

		ret = ov8865_write(sensor, OV8865_CROP_START_X_L_REG,
				   OV8865_CROP_START_X_L(mode->crop_start_x));
		if (ret)
			return ret;

		/* Offset X */

		ret = ov8865_write(sensor, OV8865_OFFSET_X_H_REG,
				   OV8865_OFFSET_X_H(mode->offset_x));
		if (ret)
			return ret;

		ret = ov8865_write(sensor, OV8865_OFFSET_X_L_REG,
				   OV8865_OFFSET_X_L(mode->offset_x));
		if (ret)
			return ret;

		/* Crop End X */

		ret = ov8865_write(sensor, OV8865_CROP_END_X_H_REG,
				   OV8865_CROP_END_X_H(mode->crop_end_x));
		if (ret)
			return ret;

		ret = ov8865_write(sensor, OV8865_CROP_END_X_L_REG,
				   OV8865_CROP_END_X_L(mode->crop_end_x));
		if (ret)
			return ret;

		/* Crop Start Y */

		ret = ov8865_write(sensor, OV8865_CROP_START_Y_H_REG,
				   OV8865_CROP_START_Y_H(mode->crop_start_y));
		if (ret)
			return ret;

		ret = ov8865_write(sensor, OV8865_CROP_START_Y_L_REG,
				   OV8865_CROP_START_Y_L(mode->crop_start_y));
		if (ret)
			return ret;

		/* Offset Y */

		ret = ov8865_write(sensor, OV8865_OFFSET_Y_H_REG,
				   OV8865_OFFSET_Y_H(mode->offset_y));
		if (ret)
			return ret;

		ret = ov8865_write(sensor, OV8865_OFFSET_Y_L_REG,
				   OV8865_OFFSET_Y_L(mode->offset_y));
		if (ret)
			return ret;

		/* Crop End Y */

		ret = ov8865_write(sensor, OV8865_CROP_END_Y_H_REG,
				   OV8865_CROP_END_Y_H(mode->crop_end_y));
		if (ret)
			return ret;

		ret = ov8865_write(sensor, OV8865_CROP_END_Y_L_REG,
				   OV8865_CROP_END_Y_L(mode->crop_end_y));
		if (ret)
			return ret;
	}

	/* VFIFO */

	ret = ov8865_write(sensor, OV8865_VFIFO_READ_START_H_REG,
			   OV8865_VFIFO_READ_START_H(mode->vfifo_read_start));
	if (ret)
		return ret;

	ret = ov8865_write(sensor, OV8865_VFIFO_READ_START_L_REG,
			   OV8865_VFIFO_READ_START_L(mode->vfifo_read_start));
	if (ret)
		return ret;

	ret = ov8865_write(sensor, OV8865_ABLC_NUM_REG,
			   OV8865_ABLC_NUM(mode->ablc_num));
	if (ret)
		return ret;

	ret = ov8865_write(sensor, OV8865_ZLINE_NUM_REG,
			   OV8865_ZLINE_NUM(mode->zline_num));
	if (ret)
		return ret;

	/* Binning */

	ret = ov8865_mode_binning_configure(sensor, mode);
	if (ret)
		return ret;

	/* Black Level */

	ret = ov8865_mode_black_level_configure(sensor, mode);
	if (ret)
		return ret;

	/* PLLs */

	ret = ov8865_mode_pll1_configure(sensor, mode, mbus_code);
	if (ret)
		return ret;

	ret = ov8865_mode_pll2_configure(sensor, mode);
	if (ret)
		return ret;

	ret = ov8865_mode_sclk_configure(sensor, mode);
	if (ret)
		return ret;

	/* Extra registers */

	if (mode->register_values) {
		ret = ov8865_write_sequence(sensor, mode->register_values,
					    mode->register_values_count);
		if (ret)
			return ret;
	}

	return 0;
}

static unsigned long ov8865_mode_mipi_clk_rate(struct ov8865_sensor *sensor,
					       const struct ov8865_mode *mode)
{
	const struct ov8865_pll1_config *config = mode->pll1_config;
	unsigned long pll1_rate;

	pll1_rate = ov8865_mode_pll1_rate(sensor, mode);

	return pll1_rate / config->m_div / 2;
}

/* Exposure */

static int ov8865_exposure_configure(struct ov8865_sensor *sensor, u32 exposure)
{
	int ret;

	ret = ov8865_write(sensor, OV8865_EXPOSURE_CTRL_HH_REG,
			   OV8865_EXPOSURE_CTRL_HH(exposure));
	if (ret)
		return ret;

	ret = ov8865_write(sensor, OV8865_EXPOSURE_CTRL_H_REG,
			   OV8865_EXPOSURE_CTRL_H(exposure));
	if (ret)
		return ret;

	return ov8865_write(sensor, OV8865_EXPOSURE_CTRL_L_REG,
			    OV8865_EXPOSURE_CTRL_L(exposure));
}

/* Gain */

static int ov8865_gain_configure(struct ov8865_sensor *sensor, u32 gain)
{
	int ret;

	ret = ov8865_write(sensor, OV8865_GAIN_CTRL_H_REG,
			   OV8865_GAIN_CTRL_H(gain));
	if (ret)
		return ret;

	return ov8865_write(sensor, OV8865_GAIN_CTRL_L_REG,
			    OV8865_GAIN_CTRL_L(gain));
}

/* White Balance */

static int ov8865_red_balance_configure(struct ov8865_sensor *sensor,
					u32 red_balance)
{
	int ret;

	ret = ov8865_write(sensor, OV8865_ISP_GAIN_RED_H_REG,
			   OV8865_ISP_GAIN_RED_H(red_balance));
	if (ret)
		return ret;

	return ov8865_write(sensor, OV8865_ISP_GAIN_RED_L_REG,
			    OV8865_ISP_GAIN_RED_L(red_balance));
}

static int ov8865_blue_balance_configure(struct ov8865_sensor *sensor,
					 u32 blue_balance)
{
	int ret;

	ret = ov8865_write(sensor, OV8865_ISP_GAIN_BLUE_H_REG,
			   OV8865_ISP_GAIN_BLUE_H(blue_balance));
	if (ret)
		return ret;

	return ov8865_write(sensor, OV8865_ISP_GAIN_BLUE_L_REG,
			    OV8865_ISP_GAIN_BLUE_L(blue_balance));
}

/* Flip */

static int ov8865_flip_vert_configure(struct ov8865_sensor *sensor, bool enable)
{
	u8 bits = OV8865_FORMAT1_FLIP_VERT_ISP_EN |
		  OV8865_FORMAT1_FLIP_VERT_SENSOR_EN;

	return ov8865_update_bits(sensor, OV8865_FORMAT1_REG, bits,
				  enable ? bits : 0);
}

static int ov8865_flip_horz_configure(struct ov8865_sensor *sensor, bool enable)
{
	u8 bits = OV8865_FORMAT2_FLIP_HORZ_ISP_EN |
		  OV8865_FORMAT2_FLIP_HORZ_SENSOR_EN;

	return ov8865_update_bits(sensor, OV8865_FORMAT2_REG, bits,
				  enable ? bits : 0);
}

/* Test Pattern */

static int ov8865_test_pattern_configure(struct ov8865_sensor *sensor,
					 unsigned int index)
{
	if (index >= ARRAY_SIZE(ov8865_test_pattern_bits))
		return -EINVAL;

	return ov8865_write(sensor, OV8865_PRE_CTRL0_REG,
			    ov8865_test_pattern_bits[index]);
}

/* State */

static int ov8865_state_mipi_configure(struct ov8865_sensor *sensor,
				       const struct ov8865_mode *mode,
				       u32 mbus_code)
{
	struct ov8865_ctrls *ctrls = &sensor->ctrls;
	struct v4l2_fwnode_bus_mipi_csi2 *bus_mipi_csi2 =
		&sensor->endpoint.bus.mipi_csi2;
	unsigned long mipi_clk_rate;
	unsigned int bits_per_sample;
	unsigned int lanes_count;
	unsigned int i, j;
	s64 mipi_pixel_rate;

	mipi_clk_rate = ov8865_mode_mipi_clk_rate(sensor, mode);
	if (!mipi_clk_rate)
		return -EINVAL;

	for (i = 0; i < ARRAY_SIZE(ov8865_link_freq_menu); i++) {
		s64 freq = ov8865_link_freq_menu[i];

		if (freq == mipi_clk_rate)
			break;
	}

	for (j = 0; j < sensor->endpoint.nr_of_link_frequencies; j++) {
		u64 freq = sensor->endpoint.link_frequencies[j];

		if (freq == mipi_clk_rate)
			break;
	}

	if (i == ARRAY_SIZE(ov8865_link_freq_menu)) {
		dev_err(sensor->dev,
			"failed to find %lu clk rate in link freq\n",
			mipi_clk_rate);
	} else if (j == sensor->endpoint.nr_of_link_frequencies) {
		dev_err(sensor->dev,
			"failed to find %lu clk rate in endpoint link-frequencies\n",
			mipi_clk_rate);
	} else {
		__v4l2_ctrl_s_ctrl(ctrls->link_freq, i);
	}

	switch (mbus_code) {
	case MEDIA_BUS_FMT_SBGGR10_1X10:
		bits_per_sample = 10;
		break;
	default:
		return -EINVAL;
	}

	lanes_count = bus_mipi_csi2->num_data_lanes;
	mipi_pixel_rate = mipi_clk_rate * 2 * lanes_count / bits_per_sample;

	__v4l2_ctrl_s_ctrl_int64(ctrls->pixel_rate, mipi_pixel_rate);

	return 0;
}

static int ov8865_state_configure(struct ov8865_sensor *sensor,
				  const struct ov8865_mode *mode,
				  u32 mbus_code)
{
	int ret;

	if (sensor->state.streaming)
		return -EBUSY;

	/* State will be configured at first power on otherwise. */
	if (pm_runtime_enabled(sensor->dev) &&
	    !pm_runtime_suspended(sensor->dev)) {
		ret = ov8865_mode_configure(sensor, mode, mbus_code);
		if (ret)
			return ret;
	}

	ret = ov8865_state_mipi_configure(sensor, mode, mbus_code);
	if (ret)
		return ret;

	sensor->state.mode = mode;
	sensor->state.mbus_code = mbus_code;

	return 0;
}

static int ov8865_state_init(struct ov8865_sensor *sensor)
{
	return ov8865_state_configure(sensor, &ov8865_modes[0],
				      ov8865_mbus_codes[0]);
}

/* Sensor Base */

static int ov8865_sensor_init(struct ov8865_sensor *sensor)
{
	int ret;

	ret = ov8865_sw_reset(sensor);
	if (ret) {
		dev_err(sensor->dev, "failed to perform sw reset\n");
		return ret;
	}

	ret = ov8865_sw_standby(sensor, 1);
	if (ret) {
		dev_err(sensor->dev, "failed to set sensor standby\n");
		return ret;
	}

	ret = ov8865_chip_id_check(sensor);
	if (ret) {
		dev_err(sensor->dev, "failed to check sensor chip id\n");
		return ret;
	}

	ret = ov8865_write_sequence(sensor, ov8865_init_sequence,
				    ARRAY_SIZE(ov8865_init_sequence));
	if (ret) {
		dev_err(sensor->dev, "failed to write init sequence\n");
		return ret;
	}

	ret = ov8865_charge_pump_configure(sensor);
	if (ret) {
		dev_err(sensor->dev, "failed to configure pad\n");
		return ret;
	}

	ret = ov8865_mipi_configure(sensor);
	if (ret) {
		dev_err(sensor->dev, "failed to configure MIPI\n");
		return ret;
	}

	ret = ov8865_isp_configure(sensor);
	if (ret) {
		dev_err(sensor->dev, "failed to configure ISP\n");
		return ret;
	}

	ret = ov8865_black_level_configure(sensor);
	if (ret) {
		dev_err(sensor->dev, "failed to configure black level\n");
		return ret;
	}

	/* Configure current mode. */
	ret = ov8865_state_configure(sensor, sensor->state.mode,
				     sensor->state.mbus_code);
	if (ret) {
		dev_err(sensor->dev, "failed to configure state\n");
		return ret;
	}

	return 0;
}

static int ov8865_sensor_power(struct ov8865_sensor *sensor, bool on)
{
	/* Keep initialized to zero for disable label. */
	int ret = 0;

	if (on) {
		gpiod_set_value_cansleep(sensor->reset, 1);
		gpiod_set_value_cansleep(sensor->powerdown, 1);

		ret = regulator_enable(sensor->dovdd);
		if (ret) {
			dev_err(sensor->dev,
				"failed to enable DOVDD regulator\n");
			goto disable;
		}

		ret = regulator_enable(sensor->avdd);
		if (ret) {
			dev_err(sensor->dev,
				"failed to enable AVDD regulator\n");
			goto disable;
		}

		ret = regulator_enable(sensor->dvdd);
		if (ret) {
			dev_err(sensor->dev,
				"failed to enable DVDD regulator\n");
			goto disable;
		}

		ret = clk_prepare_enable(sensor->extclk);
		if (ret) {
			dev_err(sensor->dev, "failed to enable EXTCLK clock\n");
			goto disable;
		}

		gpiod_set_value_cansleep(sensor->reset, 0);
		gpiod_set_value_cansleep(sensor->powerdown, 0);

		/* Time to enter streaming mode according to power timings. */
		usleep_range(10000, 12000);
	} else {
disable:
		gpiod_set_value_cansleep(sensor->powerdown, 1);
		gpiod_set_value_cansleep(sensor->reset, 1);

		clk_disable_unprepare(sensor->extclk);

		regulator_disable(sensor->dvdd);
		regulator_disable(sensor->avdd);
		regulator_disable(sensor->dovdd);
	}

	return ret;
}

/* Controls */

static int ov8865_s_ctrl(struct v4l2_ctrl *ctrl)
{
	struct v4l2_subdev *subdev = ov8865_ctrl_subdev(ctrl);
	struct ov8865_sensor *sensor = ov8865_subdev_sensor(subdev);
	unsigned int index;
	int ret;

	/* Wait for the sensor to be on before setting controls. */
	if (pm_runtime_suspended(sensor->dev))
		return 0;

	switch (ctrl->id) {
	case V4L2_CID_EXPOSURE:
		ret = ov8865_exposure_configure(sensor, ctrl->val);
		if (ret)
			return ret;
		break;
	case V4L2_CID_GAIN:
		ret = ov8865_gain_configure(sensor, ctrl->val);
		if (ret)
			return ret;
		break;
	case V4L2_CID_RED_BALANCE:
		return ov8865_red_balance_configure(sensor, ctrl->val);
	case V4L2_CID_BLUE_BALANCE:
		return ov8865_blue_balance_configure(sensor, ctrl->val);
	case V4L2_CID_HFLIP:
		return ov8865_flip_horz_configure(sensor, !!ctrl->val);
	case V4L2_CID_VFLIP:
		return ov8865_flip_vert_configure(sensor, !!ctrl->val);
	case V4L2_CID_TEST_PATTERN:
		index = (unsigned int)ctrl->val;
		return ov8865_test_pattern_configure(sensor, index);
	default:
		return -EINVAL;
	}

	return 0;
}

static const struct v4l2_ctrl_ops ov8865_ctrl_ops = {
	.s_ctrl			= ov8865_s_ctrl,
};

static int ov8865_ctrls_init(struct ov8865_sensor *sensor)
{
	struct ov8865_ctrls *ctrls = &sensor->ctrls;
	struct v4l2_ctrl_handler *handler = &ctrls->handler;
	const struct v4l2_ctrl_ops *ops = &ov8865_ctrl_ops;
	int ret;

	v4l2_ctrl_handler_init(handler, 32);

	/* Use our mutex for ctrl locking. */
	handler->lock = &sensor->mutex;

	/* Exposure */

	v4l2_ctrl_new_std(handler, ops, V4L2_CID_EXPOSURE, 16, 1048575, 16,
			  512);

	/* Gain */

	v4l2_ctrl_new_std(handler, ops, V4L2_CID_GAIN, 128, 8191, 128, 128);

	/* White Balance */

	v4l2_ctrl_new_std(handler, ops, V4L2_CID_RED_BALANCE, 1, 32767, 1,
			  1024);

	v4l2_ctrl_new_std(handler, ops, V4L2_CID_BLUE_BALANCE, 1, 32767, 1,
			  1024);

	/* Flip */

	v4l2_ctrl_new_std(handler, ops, V4L2_CID_HFLIP, 0, 1, 1, 0);
	v4l2_ctrl_new_std(handler, ops, V4L2_CID_VFLIP, 0, 1, 1, 0);

	/* Test Pattern */

	v4l2_ctrl_new_std_menu_items(handler, ops, V4L2_CID_TEST_PATTERN,
				     ARRAY_SIZE(ov8865_test_pattern_menu) - 1,
				     0, 0, ov8865_test_pattern_menu);

	/* MIPI CSI-2 */

	ctrls->link_freq =
		v4l2_ctrl_new_int_menu(handler, NULL, V4L2_CID_LINK_FREQ,
				       ARRAY_SIZE(ov8865_link_freq_menu) - 1,
				       0, ov8865_link_freq_menu);

	ctrls->pixel_rate =
		v4l2_ctrl_new_std(handler, NULL, V4L2_CID_PIXEL_RATE, 1,
				  INT_MAX, 1, 1);

	if (handler->error) {
		ret = handler->error;
		goto error_ctrls;
	}

	ctrls->link_freq->flags |= V4L2_CTRL_FLAG_READ_ONLY;
	ctrls->pixel_rate->flags |= V4L2_CTRL_FLAG_READ_ONLY;

	sensor->subdev.ctrl_handler = handler;

	return 0;

error_ctrls:
	v4l2_ctrl_handler_free(handler);

	return ret;
}

/* Subdev Video Operations */

static int ov8865_s_stream(struct v4l2_subdev *subdev, int enable)
{
	struct ov8865_sensor *sensor = ov8865_subdev_sensor(subdev);
	struct ov8865_state *state = &sensor->state;
	int ret;

	if (enable) {
		ret = pm_runtime_get_sync(sensor->dev);
		if (ret < 0) {
			pm_runtime_put_noidle(sensor->dev);
			return ret;
		}
	}

	mutex_lock(&sensor->mutex);
	ret = ov8865_sw_standby(sensor, !enable);
	mutex_unlock(&sensor->mutex);

	if (ret)
		return ret;

	state->streaming = !!enable;

	if (!enable)
		pm_runtime_put(sensor->dev);

	return 0;
}

static int ov8865_g_frame_interval(struct v4l2_subdev *subdev,
				   struct v4l2_subdev_frame_interval *interval)
{
	struct ov8865_sensor *sensor = ov8865_subdev_sensor(subdev);
	const struct ov8865_mode *mode;
	int ret = 0;

	mutex_lock(&sensor->mutex);

	mode = sensor->state.mode;
	interval->interval = mode->frame_interval;

	mutex_unlock(&sensor->mutex);

	return ret;
}

static const struct v4l2_subdev_video_ops ov8865_subdev_video_ops = {
	.s_stream		= ov8865_s_stream,
	.g_frame_interval	= ov8865_g_frame_interval,
	.s_frame_interval	= ov8865_g_frame_interval,
};

/* Subdev Pad Operations */

static int ov8865_enum_mbus_code(struct v4l2_subdev *subdev,
				 struct v4l2_subdev_pad_config *config,
				 struct v4l2_subdev_mbus_code_enum *code_enum)
{
	if (code_enum->index >= ARRAY_SIZE(ov8865_mbus_codes))
		return -EINVAL;

	code_enum->code = ov8865_mbus_codes[code_enum->index];

	return 0;
}

static void ov8865_mbus_format_fill(struct v4l2_mbus_framefmt *mbus_format,
				    u32 mbus_code,
				    const struct ov8865_mode *mode)
{
	mbus_format->width = mode->output_size_x;
	mbus_format->height = mode->output_size_y;
	mbus_format->code = mbus_code;

	mbus_format->field = V4L2_FIELD_NONE;
	mbus_format->colorspace = V4L2_COLORSPACE_RAW;
	mbus_format->ycbcr_enc =
		V4L2_MAP_YCBCR_ENC_DEFAULT(mbus_format->colorspace);
	mbus_format->quantization = V4L2_QUANTIZATION_FULL_RANGE;
	mbus_format->xfer_func =
		V4L2_MAP_XFER_FUNC_DEFAULT(mbus_format->colorspace);
}

static int ov8865_get_fmt(struct v4l2_subdev *subdev,
			  struct v4l2_subdev_pad_config *config,
			  struct v4l2_subdev_format *format)
{
	struct ov8865_sensor *sensor = ov8865_subdev_sensor(subdev);
	struct v4l2_mbus_framefmt *mbus_format = &format->format;

	mutex_lock(&sensor->mutex);

	if (format->which == V4L2_SUBDEV_FORMAT_TRY)
		*mbus_format = *v4l2_subdev_get_try_format(subdev, config,
							   format->pad);
	else
		ov8865_mbus_format_fill(mbus_format, sensor->state.mbus_code,
					sensor->state.mode);

	mutex_unlock(&sensor->mutex);

	return 0;
}

static int ov8865_set_fmt(struct v4l2_subdev *subdev,
			  struct v4l2_subdev_pad_config *config,
			  struct v4l2_subdev_format *format)
{
	struct ov8865_sensor *sensor = ov8865_subdev_sensor(subdev);
	struct v4l2_mbus_framefmt *mbus_format = &format->format;
	const struct ov8865_mode *mode;
	u32 mbus_code = 0;
	unsigned int index;
	int ret = 0;

	mutex_lock(&sensor->mutex);

	if (sensor->state.streaming) {
		ret = -EBUSY;
		goto complete;
	}

	/* Try to find requested mbus code. */
	for (index = 0; index < ARRAY_SIZE(ov8865_mbus_codes); index++) {
		if (ov8865_mbus_codes[index] == mbus_format->code) {
			mbus_code = mbus_format->code;
			break;
		}
	}

	/* Fallback to default. */
	if (!mbus_code)
		mbus_code = ov8865_mbus_codes[0];

	/* Find the mode with nearest dimensions. */
	mode = v4l2_find_nearest_size(ov8865_modes, ARRAY_SIZE(ov8865_modes),
				      output_size_x, output_size_y,
				      mbus_format->width, mbus_format->height);
	if (!mode) {
		ret = -EINVAL;
		goto complete;
	}

	ov8865_mbus_format_fill(mbus_format, mbus_code, mode);

	if (format->which == V4L2_SUBDEV_FORMAT_TRY)
		*v4l2_subdev_get_try_format(subdev, config, format->pad) =
			*mbus_format;
	else if (sensor->state.mode != mode ||
		 sensor->state.mbus_code != mbus_code)
		ret = ov8865_state_configure(sensor, mode, mbus_code);

complete:
	mutex_unlock(&sensor->mutex);

	return ret;
}

static int ov8865_enum_frame_size(struct v4l2_subdev *subdev,
				  struct v4l2_subdev_pad_config *config,
				  struct v4l2_subdev_frame_size_enum *size_enum)
{
	const struct ov8865_mode *mode;

	if (size_enum->index >= ARRAY_SIZE(ov8865_modes))
		return -EINVAL;

	mode = &ov8865_modes[size_enum->index];

	size_enum->min_width = size_enum->max_width = mode->output_size_x;
	size_enum->min_height = size_enum->max_height = mode->output_size_y;

	return 0;
}

static int ov8865_enum_frame_interval(struct v4l2_subdev *subdev,
				      struct v4l2_subdev_pad_config *config,
				      struct v4l2_subdev_frame_interval_enum *interval_enum)
{
	const struct ov8865_mode *mode = NULL;
	unsigned int mode_index;
	unsigned int interval_index;

	if (interval_enum->index > 0)
		return -EINVAL;
	/*
	 * Multiple modes with the same dimensions may have different frame
	 * intervals, so look up each relevant mode.
	 */
	for (mode_index = 0, interval_index = 0;
	     mode_index < ARRAY_SIZE(ov8865_modes); mode_index++) {
		mode = &ov8865_modes[mode_index];

		if (mode->output_size_x == interval_enum->width &&
		    mode->output_size_y == interval_enum->height) {
			if (interval_index == interval_enum->index)
				break;

			interval_index++;
		}
	}

	if (mode_index == ARRAY_SIZE(ov8865_modes) || !mode)
		return -EINVAL;

	interval_enum->interval = mode->frame_interval;

	return 0;
}

static const struct v4l2_subdev_pad_ops ov8865_subdev_pad_ops = {
	.enum_mbus_code		= ov8865_enum_mbus_code,
	.get_fmt		= ov8865_get_fmt,
	.set_fmt		= ov8865_set_fmt,
	.enum_frame_size	= ov8865_enum_frame_size,
	.enum_frame_interval	= ov8865_enum_frame_interval,
};

static const struct v4l2_subdev_ops ov8865_subdev_ops = {
	.video		= &ov8865_subdev_video_ops,
	.pad		= &ov8865_subdev_pad_ops,
};

static int ov8865_suspend(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct v4l2_subdev *subdev = i2c_get_clientdata(client);
	struct ov8865_sensor *sensor = ov8865_subdev_sensor(subdev);
	struct ov8865_state *state = &sensor->state;
	int ret = 0;

	mutex_lock(&sensor->mutex);

	if (state->streaming) {
		ret = ov8865_sw_standby(sensor, true);
		if (ret)
			goto complete;
	}

	ret = ov8865_sensor_power(sensor, false);
	if (ret)
		ov8865_sw_standby(sensor, false);

complete:
	mutex_unlock(&sensor->mutex);

	return ret;
}

static int ov8865_resume(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct v4l2_subdev *subdev = i2c_get_clientdata(client);
	struct ov8865_sensor *sensor = ov8865_subdev_sensor(subdev);
	struct ov8865_state *state = &sensor->state;
	int ret = 0;

	mutex_lock(&sensor->mutex);

	ret = ov8865_sensor_power(sensor, true);
	if (ret)
		goto complete;

	ret = ov8865_sensor_init(sensor);
	if (ret)
		goto error_power;

	ret = __v4l2_ctrl_handler_setup(&sensor->ctrls.handler);
	if (ret)
		goto error_power;

	if (state->streaming) {
		ret = ov8865_sw_standby(sensor, false);
		if (ret)
			goto error_power;
	}

	goto complete;

error_power:
	ov8865_sensor_power(sensor, false);

complete:
	mutex_unlock(&sensor->mutex);

	return ret;
}

static int ov8865_probe(struct i2c_client *client)
{
	struct device *dev = &client->dev;
	struct fwnode_handle *handle;
	struct ov8865_sensor *sensor;
	struct v4l2_subdev *subdev;
	struct media_pad *pad;
	unsigned long rate;
	int ret;

	sensor = devm_kzalloc(dev, sizeof(*sensor), GFP_KERNEL);
	if (!sensor)
		return -ENOMEM;

	sensor->dev = dev;
	sensor->i2c_client = client;

	/* Graph Endpoint */

	handle = fwnode_graph_get_next_endpoint(dev_fwnode(dev), NULL);
	if (!handle) {
		dev_err(dev, "unable to find enpoint node\n");
		return -EINVAL;
	}

	sensor->endpoint.bus_type = V4L2_MBUS_CSI2_DPHY;

	ret = v4l2_fwnode_endpoint_alloc_parse(handle, &sensor->endpoint);
	fwnode_handle_put(handle);
	if (ret) {
		dev_err(dev, "failed to parse endpoint node\n");
		return ret;
	}

	/* GPIOs */

	sensor->powerdown = devm_gpiod_get_optional(dev, "powerdown",
						    GPIOD_OUT_HIGH);
	if (IS_ERR(sensor->powerdown)) {
		ret = PTR_ERR(sensor->powerdown);
		goto error_endpoint;
	}

	sensor->reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
	if (IS_ERR(sensor->reset)) {
		ret = PTR_ERR(sensor->reset);
		goto error_endpoint;
	}

	/* Regulators */

	/* DVDD: digital core */
	sensor->dvdd = devm_regulator_get(dev, "dvdd");
	if (IS_ERR(sensor->dvdd)) {
		dev_err(dev, "cannot get DVDD (digital core) regulator\n");
		ret = PTR_ERR(sensor->dvdd);
		goto error_endpoint;
	}

	/* DOVDD: digital I/O */
	sensor->dovdd = devm_regulator_get(dev, "dovdd");
	if (IS_ERR(sensor->dovdd)) {
		dev_err(dev, "cannot get DOVDD (digital I/O) regulator\n");
		ret = PTR_ERR(sensor->dovdd);
		goto error_endpoint;
	}

	/* AVDD: analog */
	sensor->avdd = devm_regulator_get(dev, "avdd");
	if (IS_ERR(sensor->avdd)) {
		dev_err(dev, "cannot get AVDD (analog) regulator\n");
		ret = PTR_ERR(sensor->avdd);
		goto error_endpoint;
	}

	/* External Clock */

	sensor->extclk = devm_clk_get(dev, NULL);
	if (IS_ERR(sensor->extclk)) {
		dev_err(dev, "failed to get external clock\n");
		ret = PTR_ERR(sensor->extclk);
		goto error_endpoint;
	}

	rate = clk_get_rate(sensor->extclk);
	if (rate != OV8865_EXTCLK_RATE) {
		dev_err(dev, "clock rate %lu Hz is unsupported\n", rate);
		ret = -EINVAL;
		goto error_endpoint;
	}

	/* Subdev, entity and pad */

	subdev = &sensor->subdev;
	v4l2_i2c_subdev_init(subdev, client, &ov8865_subdev_ops);

	subdev->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
	subdev->entity.function = MEDIA_ENT_F_CAM_SENSOR;

	pad = &sensor->pad;
	pad->flags = MEDIA_PAD_FL_SOURCE;

	ret = media_entity_pads_init(&subdev->entity, 1, pad);
	if (ret)
		goto error_entity;

	/* Mutex */

	mutex_init(&sensor->mutex);

	/* Sensor */

	ret = ov8865_ctrls_init(sensor);
	if (ret)
		goto error_mutex;

	ret = ov8865_state_init(sensor);
	if (ret)
		goto error_ctrls;

	/* Runtime PM */

	pm_runtime_enable(sensor->dev);
	pm_runtime_set_suspended(sensor->dev);

	/* V4L2 subdev register */

	ret = v4l2_async_register_subdev_sensor_common(subdev);
	if (ret)
		goto error_pm;

	return 0;

error_pm:
	pm_runtime_disable(sensor->dev);

error_ctrls:
	v4l2_ctrl_handler_free(&sensor->ctrls.handler);

error_mutex:
	mutex_destroy(&sensor->mutex);

error_entity:
	media_entity_cleanup(&sensor->subdev.entity);

error_endpoint:
	v4l2_fwnode_endpoint_free(&sensor->endpoint);

	return ret;
}

static int ov8865_remove(struct i2c_client *client)
{
	struct v4l2_subdev *subdev = i2c_get_clientdata(client);
	struct ov8865_sensor *sensor = ov8865_subdev_sensor(subdev);

	v4l2_async_unregister_subdev(subdev);
	pm_runtime_disable(sensor->dev);
	v4l2_ctrl_handler_free(&sensor->ctrls.handler);
	mutex_destroy(&sensor->mutex);
	media_entity_cleanup(&subdev->entity);

	v4l2_fwnode_endpoint_free(&sensor->endpoint);

	return 0;
}

static const struct dev_pm_ops ov8865_pm_ops = {
	SET_RUNTIME_PM_OPS(ov8865_suspend, ov8865_resume, NULL)
};

static const struct of_device_id ov8865_of_match[] = {
	{ .compatible = "ovti,ov8865" },
	{ }
};
MODULE_DEVICE_TABLE(of, ov8865_of_match);

static struct i2c_driver ov8865_driver = {
	.driver = {
		.name = "ov8865",
		.of_match_table = ov8865_of_match,
		.pm = &ov8865_pm_ops,
	},
	.probe_new = ov8865_probe,
	.remove	 = ov8865_remove,
};

module_i2c_driver(ov8865_driver);

MODULE_AUTHOR("Paul Kocialkowski <paul.kocialkowski@bootlin.com>");
MODULE_DESCRIPTION("V4L2 driver for the OmniVision OV8865 image sensor");
MODULE_LICENSE("GPL v2");