[PATCH v4 3/3] media: i2c: Add driver for THine THP7312

[Laurent Pinchart <laurent.pinchart@ideasonboard.com>]

From: Paul Elder <paul.elder@ideasonboard.com>

The THP7312 is an external camera ISP from THine. Add a V4L2 subdev
driver for it.

Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Co-developed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
---
Changes since v3:

- Move thp7312_get_regulators() to probe section
- Turn firmware update handlers static
- Wire up power management in struct driver
- Remove unnecessary double underscore function prefixes
- Configure CSI-2 lanes at stream on time
- Clean up naming of power management functions

Changes since v2:

- Make boot-mode property optional
- Fix dev_err_probe() usage in DT parsing
- Additional dev_err_probe() usage
- Use %u instead of %d for unsigned values
- Don't split lines unnecessarily
- Fix error handling in firmware upload initialization
- Use CCI helpers in firmware update code
- Fix runtime PM usage count
---
 MAINTAINERS                 |    1 +
 drivers/media/i2c/Kconfig   |   16 +
 drivers/media/i2c/Makefile  |    1 +
 drivers/media/i2c/thp7312.c | 2339 +++++++++++++++++++++++++++++++++++
 4 files changed, 2357 insertions(+)
 create mode 100644 drivers/media/i2c/thp7312.c

diff --git a/MAINTAINERS b/MAINTAINERS
index d2c15c0b22c7..1ba2e15111d6 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -21455,6 +21455,7 @@ S:	Maintained
 T:	git git://linuxtv.org/media_tree.git
 F:	Documentation/devicetree/bindings/media/i2c/thine,thp7312.yaml
 F:	Documentation/userspace-api/media/drivers/thp7312.rst
+F:	drivers/media/i2c/thp7312.c
 F:	include/uapi/linux/thp7312.h
 
 THUNDERBOLT DMA TRAFFIC TEST DRIVER
diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
index 59ee0ca2c978..aa659bea91b3 100644
--- a/drivers/media/i2c/Kconfig
+++ b/drivers/media/i2c/Kconfig
@@ -628,6 +628,22 @@ source "drivers/media/i2c/et8ek8/Kconfig"
 
 endif
 
+menu "Camera ISPs"
+	visible if MEDIA_CAMERA_SUPPORT
+
+config VIDEO_THP7312
+	tristate "THine THP7312 support"
+	depends on I2C
+	select MEDIA_CONTROLLER
+	select V4L2_CCI_I2C
+	select V4L2_FWNODE
+	select VIDEO_V4L2_SUBDEV_API
+	help
+	  This is a Video4Linux2 sensor-level driver for the THine
+	  THP7312 ISP.
+
+endmenu
+
 menu "Lens drivers"
 	visible if MEDIA_CAMERA_SUPPORT
 
diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
index f5010f80a21f..5e67217ede45 100644
--- a/drivers/media/i2c/Makefile
+++ b/drivers/media/i2c/Makefile
@@ -128,6 +128,7 @@ obj-$(CONFIG_VIDEO_TDA7432) += tda7432.o
 obj-$(CONFIG_VIDEO_TDA9840) += tda9840.o
 obj-$(CONFIG_VIDEO_TEA6415C) += tea6415c.o
 obj-$(CONFIG_VIDEO_TEA6420) += tea6420.o
+obj-$(CONFIG_VIDEO_THP7312) += thp7312.o
 obj-$(CONFIG_VIDEO_THS7303) += ths7303.o
 obj-$(CONFIG_VIDEO_THS8200) += ths8200.o
 obj-$(CONFIG_VIDEO_TLV320AIC23B) += tlv320aic23b.o
diff --git a/drivers/media/i2c/thp7312.c b/drivers/media/i2c/thp7312.c
new file mode 100644
index 000000000000..7d3de929079d
--- /dev/null
+++ b/drivers/media/i2c/thp7312.c
@@ -0,0 +1,2339 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2021 THine Electronics, Inc.
+ * Copyright (C) 2023 Ideas on Board Oy
+ */
+
+#include <asm/unaligned.h>
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/firmware.h>
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/iopoll.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mtd/spi-nor.h>
+#include <linux/of_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/regulator/consumer.h>
+#include <linux/slab.h>
+#include <linux/thp7312.h>
+#include <linux/types.h>
+
+#include <media/v4l2-async.h>
+#include <media/v4l2-cci.h>
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-event.h>
+#include <media/v4l2-fwnode.h>
+#include <media/v4l2-subdev.h>
+
+/* ISP registers */
+
+#define	THP7312_REG_FIRMWARE_VERSION_1			CCI_REG8(0xf000)
+#define THP7312_REG_CAMERA_STATUS			CCI_REG8(0xf001)
+#define	THP7312_REG_FIRMWARE_VERSION_2			CCI_REG8(0xf005)
+#define THP7312_REG_SET_OUTPUT_ENABLE			CCI_REG8(0xf008)
+#define	THP7312_OUTPUT_ENABLE				0x01
+#define	THP7312_OUTPUT_DISABLE				0x00
+#define THP7312_REG_SET_OUTPUT_COLOR_COMPRESSION	CCI_REG8(0xf009)
+#define THP7312_REG_SET_OUTPUT_COLOR_UYVY		0x00
+#define THP7312_REG_SET_OUTPUT_COLOR_YUY2		0x04
+#define	THP7312_REG_FLIP_MIRROR				CCI_REG8(0xf00c)
+#define THP7312_REG_VIDEO_IMAGE_SIZE			CCI_REG8(0xf00d)
+#define THP7312_VIDEO_IMAGE_SIZE_640x360		0x52
+#define THP7312_VIDEO_IMAGE_SIZE_640x460		0x03
+#define THP7312_VIDEO_IMAGE_SIZE_1280x720		0x0a
+#define THP7312_VIDEO_IMAGE_SIZE_1920x1080		0x0b
+#define THP7312_VIDEO_IMAGE_SIZE_3840x2160		0x0d
+#define THP7312_VIDEO_IMAGE_SIZE_4160x3120		0x14
+#define THP7312_VIDEO_IMAGE_SIZE_2016x1512		0x20
+#define THP7312_VIDEO_IMAGE_SIZE_2048x1536		0x21
+#define THP7312_REG_VIDEO_FRAME_RATE_MODE		CCI_REG8(0xf00f)
+#define THP7312_VIDEO_FRAME_RATE_MODE1			0x80
+#define THP7312_VIDEO_FRAME_RATE_MODE2			0x81
+#define THP7312_VIDEO_FRAME_RATE_MODE3			0x82
+#define THP7312_REG_SET_DRIVING_MODE			CCI_REG8(0xf010)
+#define THP7312_REG_DRIVING_MODE_STATUS			CCI_REG8(0xf011)
+#define THP7312_REG_JPEG_COMPRESSION_FACTOR		CCI_REG8(0xf01b)
+#define THP7312_REG_AE_EXPOSURE_COMPENSATION		CCI_REG8(0xf022)
+#define THP7312_REG_AE_FLICKER_MODE			CCI_REG8(0xf023)
+#define THP7312_AE_FLICKER_MODE_50			0x00
+#define THP7312_AE_FLICKER_MODE_60			0x01
+#define THP7312_AE_FLICKER_MODE_DISABLE			0x80
+#define THP7312_REG_AE_FIX_FRAME_RATE			CCI_REG8(0xf02e)
+#define THP7312_REG_MANUAL_WB_RED_GAIN			CCI_REG8(0xf036)
+#define THP7312_REG_MANUAL_WB_BLUE_GAIN			CCI_REG8(0xf037)
+#define THP7312_REG_WB_MODE				CCI_REG8(0xf039)
+#define THP7312_WB_MODE_AUTO				0x00
+#define THP7312_WB_MODE_MANUAL				0x11
+#define	THP7312_REG_MANUAL_FOCUS_POSITION		CCI_REG16(0xf03c)
+#define	THP7312_REG_AF_CONTROL				CCI_REG8(0xf040)
+#define	THP7312_REG_AF_CONTROL_AF			0x01
+#define	THP7312_REG_AF_CONTROL_MANUAL			0x10
+#define	THP7312_REG_AF_CONTROL_LOCK			0x80
+#define THP7312_REG_AF_SETTING				CCI_REG8(0xf041)
+/*
+ * TODO: Bits 4 and 5 seems to select between oneshot and continuous mode, and
+ * bits 6 and 7 to select the focus method. The value for continuous hybrid mode
+ * is an outlier, verify that it is correct.
+ */
+#define THP7312_REG_AF_SETTING_ONESHOT_CONTRAST		0x00
+#define THP7312_REG_AF_SETTING_ONESHOT_PDAF		0x40
+#define THP7312_REG_AF_SETTING_ONESHOT_HYBRID		0x80
+#define THP7312_REG_AF_SETTING_CONTINUOUS_CONTRAST	0x30
+#define THP7312_REG_AF_SETTING_CONTINUOUS_PDAF		0x70
+#define THP7312_REG_AF_SETTING_CONTINUOUS_HYBRID	0xf0
+#define THP7312_REG_SATURATION				CCI_REG8(0xf052)
+#define THP7312_REG_SHARPNESS				CCI_REG8(0xf053)
+#define THP7312_REG_BRIGHTNESS				CCI_REG8(0xf056)
+#define THP7312_REG_CONTRAST				CCI_REG8(0xf057)
+#define THP7312_REG_NOISE_REDUCTION			CCI_REG8(0xf059)
+
+#define TH7312_REG_CUSTOM_MIPI_SET			CCI_REG8(0xf0f6)
+#define TH7312_REG_CUSTOM_MIPI_STATUS			CCI_REG8(0xf0f7)
+#define TH7312_REG_CUSTOM_MIPI_RD			CCI_REG8(0xf0f8)
+#define TH7312_REG_CUSTOM_MIPI_TD			CCI_REG8(0xf0f9)
+
+/*
+ * Firmware update registers. Those use a different address space than the
+ * normal operation ISP registers.
+ */
+
+#define THP7312_REG_FW_DRIVABILITY			CCI_REG32(0xd65c)
+#define THP7312_REG_FW_DEST_BANK_ADDR			CCI_REG32(0xff08)
+#define THP7312_REG_FW_VERIFY_RESULT			CCI_REG8(0xff60)
+#define THP7312_REG_FW_RESET_FLASH			CCI_REG8(0xff61)
+#define THP7312_REG_FW_MEMORY_IO_SETTING		CCI_REG8(0xff62)
+#define THP7312_FW_MEMORY_IO_GPIO0			1
+#define THP7312_FW_MEMORY_IO_GPIO1			0
+#define THP7312_REG_FW_CRC_RESULT			CCI_REG32(0xff64)
+#define THP7312_REG_FW_STATUS				CCI_REG8(0xfffc)
+
+enum thp7312_focus_method {
+	THP7312_FOCUS_METHOD_CONTRAST,
+	THP7312_FOCUS_METHOD_PDAF,
+	THP7312_FOCUS_METHOD_HYBRID,
+};
+
+/*
+ * enum thp7312_focus_state - State of the focus handler
+ *
+ * @THP7312_FOCUS_STATE_MANUAL: Manual focus, controlled through the
+ *	V4L2_CID_FOCUS_ABSOLUTE control
+ * @THP7312_FOCUS_STATE_AUTO: Continuous auto-focus
+ * @THP7312_FOCUS_STATE_LOCKED: Lock the focus to a fixed position. This state
+ *	is entered when switching from auto to manual mode.
+ * @THP7312_FOCUS_STATE_ONESHOT: One-shot auto-focus
+ *
+ * Valid transitions are as follow:
+ *
+ * digraph fsm {
+ *         node [shape=circle];
+ *
+ *         manual [label="MANUAL"];
+ *         auto [label="AUTO"];
+ *         locked [label="LOCKED"];
+ *         oneshot [label="ONESHOT"];
+ *
+ *         manual -> auto [label="FOCUS_AUTO <- true"]
+ *         locked -> auto [label="FOCUS_AUTO <- true"]
+ *         oneshot -> auto [label="FOCUS_AUTO <- true"]
+ *         auto -> locked [label="FOCUS_AUTO <- false"]
+ *
+ *         locked -> manual [label="FOCUS_ABSOLUTE <- *"]
+ *         oneshot -> manual [label="FOCUS_ABSOLUTE <- *"]
+ *
+ *         manual -> oneshot [label="FOCUS_START <- *"]
+ *         locked -> oneshot [label="FOCUS_START <- *"]
+ * }
+ */
+enum thp7312_focus_state {
+	THP7312_FOCUS_STATE_MANUAL,
+	THP7312_FOCUS_STATE_AUTO,
+	THP7312_FOCUS_STATE_LOCKED,
+	THP7312_FOCUS_STATE_ONESHOT,
+};
+
+enum thp7312_boot_mode {
+	THP7312_BOOT_MODE_2WIRE_SLAVE = 0,
+	THP7312_BOOT_MODE_SPI_MASTER = 1,
+};
+
+struct thp7312_frame_rate {
+	u32 fps;
+	u32 pixel_rate;
+	u8 reg_frame_rate_mode;
+};
+
+struct thp7312_mode_info {
+	u32 width;
+	u32 height;
+	u8 reg_image_size;
+	const struct thp7312_frame_rate *rates;
+};
+
+static const u32 thp7312_colour_fmts[] = {
+	MEDIA_BUS_FMT_YUYV8_1X16,
+};
+
+/* regulator supplies */
+static const char * const thp7312_supply_name[] = {
+	"vddcore",
+	"vhtermrx",
+	"vddtx",
+	"vddhost",
+	"vddcmos",
+	"vddgpio-0",
+	"vddgpio-1",
+};
+
+#define THP7312_NUM_SUPPLIES ARRAY_SIZE(thp7312_supply_name)
+
+static const struct thp7312_mode_info thp7312_mode_info_data[] = {
+	{
+		.width = 1920,
+		.height = 1080,
+		.reg_image_size = THP7312_VIDEO_IMAGE_SIZE_1920x1080,
+		.rates = (const struct thp7312_frame_rate[]) {
+			{ 30, 150000000, 0x81 },
+			{ 60, 193750000, 0x82 },
+			{ 0 }
+		},
+	}, {
+		.width = 2048,
+		.height = 1536,
+		.reg_image_size = THP7312_VIDEO_IMAGE_SIZE_2048x1536,
+		.rates = (const struct thp7312_frame_rate[]) {
+			{ 30, 150000000, 0x81 },
+			{ 0 }
+		}
+	}, {
+		.width = 3840,
+		.height = 2160,
+		.reg_image_size = THP7312_VIDEO_IMAGE_SIZE_3840x2160,
+		.rates = (const struct thp7312_frame_rate[]) {
+			{ 30, 300000000, 0x81 },
+			{ 0 }
+		},
+	}, {
+		.width = 4160,
+		.height = 3120,
+		.reg_image_size = THP7312_VIDEO_IMAGE_SIZE_4160x3120,
+		.rates = (const struct thp7312_frame_rate[]) {
+			{ 20, 300000000, 0x81 },
+			{ 0 }
+		},
+	},
+};
+
+#define THP7312_NUM_MODES ARRAY_SIZE(thp7312_mode_info_data)
+
+struct thp7312_device;
+
+struct thp7312_sensor_supply {
+	const char *name;
+	unsigned int post_delay_us;
+};
+
+struct thp7312_sensor_info {
+	const char *model;
+	const char *name;
+	unsigned int i2c_addr;
+	const struct thp7312_sensor_supply *supplies;
+};
+
+struct thp7312_sensor {
+	struct thp7312_device *thp7312;
+	unsigned int index;
+	u8 data_lanes[4];
+
+	struct device_node *of_node;
+	struct device *dev;
+	unsigned int num_supplies;
+	struct regulator_bulk_data *supplies;
+};
+
+struct thp7312_device {
+	struct device *dev;
+	struct regmap *regmap;
+
+	struct v4l2_subdev sd;
+	struct media_pad pad;
+
+	/* DT endpoint info */
+	struct v4l2_fwnode_endpoint ep;
+	struct gpio_desc *reset_gpio;
+	struct regulator_bulk_data supplies[THP7312_NUM_SUPPLIES];
+	struct clk *iclk;
+
+	const struct thp7312_sensor_info *sensor_info;
+	struct thp7312_sensor sensors[1];
+
+	enum thp7312_boot_mode boot_mode;
+
+	struct v4l2_ctrl_handler ctrl_handler;
+
+	/* These are protected by v4l2 active state */
+	const struct thp7312_mode_info *current_mode;
+	const struct thp7312_frame_rate *current_rate;
+
+	struct {
+		struct v4l2_ctrl *focus_auto;
+		struct v4l2_ctrl *focus_absolute;
+		struct v4l2_ctrl *focus_start;
+		struct v4l2_ctrl *focus_method;
+	};
+
+	enum thp7312_focus_state focus_state;
+
+	struct {
+		struct v4l2_ctrl *noise_reduction_auto;
+		struct v4l2_ctrl *noise_reduction_absolute;
+	};
+
+	const char *fw_name;
+	u8 *fw_data;
+	size_t fw_size;
+
+	u8 fw_major_version;
+	u8 fw_minor_version;
+
+	/* Lock to protect fw_cancel */
+	struct mutex fw_lock;
+	struct fw_upload *fwl;
+	bool fw_cancel;
+	u8 *fw_write_buf;
+};
+
+static const struct thp7312_sensor_info thp7312_sensor_info[] = {
+	{
+		.model = "sony,imx258",
+		.name = "imx258",
+		.i2c_addr = 0x0,
+		.supplies = (const struct thp7312_sensor_supply[]) {
+			{ "dovdd", 0 },
+			{ "avdd", 0 },
+			{ "dvdd", 0 },
+			{ NULL, 0 },
+		},
+	},
+};
+
+static inline struct thp7312_device *to_thp7312_dev(struct v4l2_subdev *sd)
+{
+	return container_of(sd, struct thp7312_device, sd);
+}
+
+/* -----------------------------------------------------------------------------
+ * Device Access & Configuration
+ */
+
+#define thp7312_read_poll_timeout(dev, addr, val, cond, sleep_us, timeout_us) \
+({ \
+	int __ret, __err; \
+	__ret = read_poll_timeout(cci_read, __err, __err || (cond), sleep_us, \
+				  timeout_us, false, (dev)->regmap, addr, \
+				  &(val), NULL); \
+	__ret ? : __err; \
+})
+
+static int thp7312_set_mipi_regs(struct thp7312_device *thp7312, u32 reg,
+				 u8 *lanes, u8 num_lanes)
+{
+	u8 used_lanes = 0;
+	u8 conv_lanes[4];
+	u8 val;
+	unsigned int i;
+
+	/*
+	 * The value that we write to the register is the index in the
+	 * data-lanes array, so we need to do a conversion. Do this in the same
+	 * pass as validating data-lanes.
+	 */
+	for (i = 0; i < num_lanes; i++) {
+		if (lanes[i] > 4)
+			return -EINVAL;
+
+		if (used_lanes & (1 << lanes[i]))
+			return -EINVAL;
+
+		used_lanes |= 1 << lanes[i];
+
+		/*
+		 * data-lanes is 1-indexed while we'll use 0-indexing for
+		 * writing the register.
+		 */
+		conv_lanes[lanes[i] - 1] = i;
+	}
+
+	val = ((conv_lanes[3] & 0x03) << 6) |
+	      ((conv_lanes[2] & 0x03) << 4) |
+	      ((conv_lanes[1] & 0x03) << 2) |
+	       (conv_lanes[0] & 0x03);
+
+	return cci_write(thp7312->regmap, reg, val, NULL);
+}
+
+static int thp7312_set_mipi_lanes(struct thp7312_device *thp7312)
+{
+	struct device *dev = thp7312->dev;
+	int ret;
+	u64 val;
+
+	ret = thp7312_set_mipi_regs(thp7312, TH7312_REG_CUSTOM_MIPI_RD,
+				    thp7312->sensors[0].data_lanes,
+				    ARRAY_SIZE(thp7312->sensors[0].data_lanes));
+	if (ret < 0) {
+		dev_err(dev, "Failed to set RD MIPI lanes: %d\n", ret);
+		return ret;
+	}
+
+	ret  = thp7312_set_mipi_regs(thp7312, TH7312_REG_CUSTOM_MIPI_TD,
+				     thp7312->ep.bus.mipi_csi2.data_lanes,
+				     thp7312->ep.bus.mipi_csi2.num_data_lanes);
+	if (ret)
+		return ret;
+
+	ret = cci_write(thp7312->regmap, TH7312_REG_CUSTOM_MIPI_SET, 1, NULL);
+	if (ret)
+		return ret;
+
+	ret = thp7312_read_poll_timeout(thp7312, TH7312_REG_CUSTOM_MIPI_STATUS,
+					val, val == 0x00, 100000, 2000000);
+	if (ret) {
+		dev_err(dev, "Failed to poll MIPI lane status: %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int thp7312_change_mode(struct thp7312_device *thp7312,
+			       const struct thp7312_mode_info *mode,
+			       const struct thp7312_frame_rate *rate)
+{
+	struct device *dev = thp7312->dev;
+	u64 val = 0;
+	int ret;
+
+	ret = thp7312_read_poll_timeout(thp7312, THP7312_REG_CAMERA_STATUS, val,
+					val == 0x80, 20000, 200000);
+	if (ret < 0) {
+		dev_err(dev, "%s(): failed to poll ISP: %d\n", __func__, ret);
+		return ret;
+	}
+
+	cci_write(thp7312->regmap, THP7312_REG_VIDEO_IMAGE_SIZE,
+		  mode->reg_image_size, &ret);
+	cci_write(thp7312->regmap, THP7312_REG_VIDEO_FRAME_RATE_MODE,
+		  rate->reg_frame_rate_mode, &ret);
+	cci_write(thp7312->regmap, THP7312_REG_JPEG_COMPRESSION_FACTOR, 0x5e,
+		  &ret);
+	cci_write(thp7312->regmap, THP7312_REG_SET_DRIVING_MODE, 0x01, &ret);
+
+	if (ret)
+		return ret;
+
+	ret = thp7312_read_poll_timeout(thp7312, THP7312_REG_DRIVING_MODE_STATUS,
+					val, val == 0x01, 20000, 100000);
+	if (ret < 0) {
+		dev_err(dev, "%s(): failed\n", __func__);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int thp7312_set_framefmt(struct thp7312_device *thp7312,
+				struct v4l2_mbus_framefmt *format)
+{
+	u8 val;
+
+	switch (format->code) {
+	case MEDIA_BUS_FMT_UYVY8_1X16:
+		/* YUV422, UYVY */
+		val = THP7312_REG_SET_OUTPUT_COLOR_UYVY;
+		break;
+	case MEDIA_BUS_FMT_YUYV8_1X16:
+		/* YUV422, YUYV */
+		val = THP7312_REG_SET_OUTPUT_COLOR_YUY2;
+		break;
+	default:
+		/* Should never happen */
+		return -EINVAL;
+	}
+
+	return cci_write(thp7312->regmap,
+			 THP7312_REG_SET_OUTPUT_COLOR_COMPRESSION, val, NULL);
+}
+
+static int thp7312_init_mode(struct thp7312_device *thp7312,
+			     struct v4l2_subdev_state *sd_state)
+{
+	struct v4l2_mbus_framefmt *fmt;
+	int ret;
+
+	fmt = v4l2_subdev_get_pad_format(&thp7312->sd, sd_state, 0);
+
+	ret = thp7312_set_framefmt(thp7312, fmt);
+	if (ret)
+		return ret;
+
+	return thp7312_change_mode(thp7312, thp7312->current_mode,
+				   thp7312->current_rate);
+}
+
+static int thp7312_stream_enable(struct thp7312_device *thp7312, int enable)
+{
+	return cci_write(thp7312->regmap, THP7312_REG_SET_OUTPUT_ENABLE,
+			 enable ? THP7312_OUTPUT_ENABLE : THP7312_OUTPUT_DISABLE,
+			 NULL);
+}
+
+static int thp7312_check_status_stream_mode(struct thp7312_device *thp7312)
+{
+	struct device *dev = thp7312->dev;
+	u64 status = 0;
+	int ret;
+
+	while (status != 0x80) {
+		ret = cci_read(thp7312->regmap, THP7312_REG_CAMERA_STATUS,
+			       &status, NULL);
+		if (ret)
+			return ret;
+
+		if (status == 0x80) {
+			dev_dbg(dev, "Camera initialization done\n");
+			return 0;
+		}
+
+		if (status != 0x00) {
+			dev_err(dev, "Invalid camera status %llx\n", status);
+			return -EINVAL;
+		}
+
+		dev_dbg(dev, "Camera initializing...\n");
+		usleep_range(70000, 80000);
+	}
+
+	return 0;
+}
+
+static void thp7312_reset(struct thp7312_device *thp7312)
+{
+	gpiod_set_value_cansleep(thp7312->reset_gpio, 1);
+	/*
+	 * TODO: Shorten this delay to just above the minimum of 8 clock
+	 * cycles.
+	 */
+	fsleep(10000);
+
+	gpiod_set_value_cansleep(thp7312->reset_gpio, 0);
+	/*
+	 * TODO: The documentation states that the device needs 2ms to
+	 * initialize after reset is deasserted. It then proceeds to load the
+	 * firmware from the flash memory, which takes an unspecified amount of
+	 * time. Check if this delay could be reduced.
+	 */
+	fsleep(300000);
+}
+
+/* -----------------------------------------------------------------------------
+ * Power Management
+ */
+
+static void thp7312_power_off_sensors(struct thp7312_device *thp7312)
+{
+	unsigned int i;
+
+	if (!thp7312->sensor_info->supplies)
+		return;
+
+	for (i = 0; i < ARRAY_SIZE(thp7312->sensors); ++i) {
+		struct thp7312_sensor *sensor = &thp7312->sensors[i];
+
+		regulator_bulk_disable(sensor->num_supplies, sensor->supplies);
+	}
+}
+
+static int thp7312_power_off(struct thp7312_device *thp7312)
+{
+	thp7312_power_off_sensors(thp7312);
+	regulator_bulk_disable(THP7312_NUM_SUPPLIES, thp7312->supplies);
+	clk_disable_unprepare(thp7312->iclk);
+
+	return 0;
+}
+
+static int thp7312_power_on_sensors(struct thp7312_device *thp7312)
+{
+	struct thp7312_sensor *sensor;
+	unsigned int i, j;
+	int ret;
+
+	if (!thp7312->sensor_info->supplies)
+		return 0;
+
+	for (i = 0; i < ARRAY_SIZE(thp7312->sensors); ++i) {
+		sensor = &thp7312->sensors[i];
+		ret = 0;
+
+		for (j = 0; j < sensor->num_supplies; ++j) {
+			unsigned int delay;
+
+			/*
+			 * We can't use regulator_bulk_enable() as it would
+			 * enable all supplies in parallel, breaking the sensor
+			 * power sequencing constraints.
+			 */
+			ret = regulator_enable(sensor->supplies[j].consumer);
+			if (ret < 0) {
+				dev_err(thp7312->dev,
+					"Failed to enable supply %u for sensor %u\n",
+					j, i);
+				goto error;
+			}
+
+			delay = thp7312->sensor_info->supplies[j].post_delay_us;
+			usleep_range(delay, delay + 100);
+		}
+	}
+
+	return 0;
+
+error:
+	for (; j > 0; --j)
+		regulator_disable(sensor->supplies[j - 1].consumer);
+
+	for (; i > 0; --i) {
+		sensor = &thp7312->sensors[i - 1];
+		regulator_bulk_disable(sensor->num_supplies, sensor->supplies);
+	}
+
+	return ret;
+}
+
+static int __thp7312_power_on(struct thp7312_device *thp7312)
+{
+	struct device *dev = thp7312->dev;
+	int ret;
+
+	ret = regulator_bulk_enable(THP7312_NUM_SUPPLIES, thp7312->supplies);
+	if (ret < 0)
+		return ret;
+
+	ret = clk_prepare_enable(thp7312->iclk);
+	if (ret < 0) {
+		dev_err(dev, "clk prepare enable failed\n");
+		regulator_bulk_disable(THP7312_NUM_SUPPLIES, thp7312->supplies);
+		return ret;
+	}
+
+	/*
+	 * We cannot assume that turning off and on again will reset, so do a
+	 * software reset on power up.
+	 */
+	thp7312_reset(thp7312);
+
+	return 0;
+}
+
+static int thp7312_power_on(struct thp7312_device *thp7312)
+{
+	int ret;
+
+	ret = __thp7312_power_on(thp7312);
+	if (ret < 0)
+		return ret;
+
+	ret = thp7312_check_status_stream_mode(thp7312);
+	if (ret < 0)
+		goto error;
+
+	ret = thp7312_power_on_sensors(thp7312);
+	if (ret)
+		goto error;
+
+	return 0;
+
+error:
+	thp7312_power_off(thp7312);
+	return ret;
+}
+
+static int thp7312_pm_runtime_suspend(struct device *dev)
+{
+	struct v4l2_subdev *sd = dev_get_drvdata(dev);
+	struct thp7312_device *thp7312 = to_thp7312_dev(sd);
+
+	return thp7312_power_off(thp7312);
+}
+
+static int thp7312_pm_runtime_resume(struct device *dev)
+{
+	struct v4l2_subdev *sd = dev_get_drvdata(dev);
+	struct thp7312_device *thp7312 = to_thp7312_dev(sd);
+
+	return thp7312_power_on(thp7312);
+}
+
+static const struct dev_pm_ops thp7312_pm_ops = {
+	SET_RUNTIME_PM_OPS(thp7312_pm_runtime_suspend,
+			   thp7312_pm_runtime_resume, NULL)
+};
+
+/* -----------------------------------------------------------------------------
+ * V4L2 Subdev Operations
+ */
+
+static bool thp7312_find_bus_code(u32 code)
+{
+	unsigned int i;
+
+	for (i = 0; i < ARRAY_SIZE(thp7312_colour_fmts); ++i) {
+		if (thp7312_colour_fmts[i] == code)
+			return true;
+	}
+
+	return false;
+}
+
+static const struct thp7312_mode_info *
+thp7312_find_mode(unsigned int width, unsigned int height, bool nearest)
+{
+	const struct thp7312_mode_info *mode;
+
+	mode = v4l2_find_nearest_size(thp7312_mode_info_data,
+				      ARRAY_SIZE(thp7312_mode_info_data),
+				      width, height, width, height);
+
+	if (!nearest && (mode->width != width || mode->height != height))
+		return NULL;
+
+	return mode;
+}
+
+static int thp7312_enum_mbus_code(struct v4l2_subdev *sd,
+				  struct v4l2_subdev_state *sd_state,
+				  struct v4l2_subdev_mbus_code_enum *code)
+{
+	if (code->index >= ARRAY_SIZE(thp7312_colour_fmts))
+		return -EINVAL;
+
+	code->code = thp7312_colour_fmts[code->index];
+
+	return 0;
+}
+
+static int thp7312_enum_frame_size(struct v4l2_subdev *sd,
+				   struct v4l2_subdev_state *sd_state,
+				   struct v4l2_subdev_frame_size_enum *fse)
+{
+	if (!thp7312_find_bus_code(fse->code))
+		return -EINVAL;
+
+	if (fse->index >= THP7312_NUM_MODES)
+		return -EINVAL;
+
+	fse->min_width = thp7312_mode_info_data[fse->index].width;
+	fse->max_width = fse->min_width;
+	fse->min_height = thp7312_mode_info_data[fse->index].height;
+	fse->max_height = fse->min_height;
+
+	return 0;
+}
+
+static int thp7312_enum_frame_interval(struct v4l2_subdev *sd,
+				       struct v4l2_subdev_state *sd_state,
+				       struct v4l2_subdev_frame_interval_enum *fie)
+{
+	const struct thp7312_frame_rate *rate;
+	const struct thp7312_mode_info *mode;
+	unsigned int index = fie->index;
+
+	if (!thp7312_find_bus_code(fie->code))
+		return -EINVAL;
+
+	mode = thp7312_find_mode(fie->width, fie->height, false);
+	if (!mode)
+		return -EINVAL;
+
+	for (rate = mode->rates; rate->fps; ++rate, --index) {
+		if (!index) {
+			fie->interval.numerator = 1;
+			fie->interval.denominator = rate->fps;
+			return 0;
+		}
+	}
+
+	return -EINVAL;
+}
+
+static int thp7312_set_fmt(struct v4l2_subdev *sd,
+			   struct v4l2_subdev_state *sd_state,
+			   struct v4l2_subdev_format *format)
+{
+	struct thp7312_device *thp7312 = to_thp7312_dev(sd);
+	struct v4l2_mbus_framefmt *mbus_fmt = &format->format;
+	struct v4l2_mbus_framefmt *fmt;
+	const struct thp7312_mode_info *mode;
+
+	if (!thp7312_find_bus_code(mbus_fmt->code))
+		mbus_fmt->code = thp7312_colour_fmts[0];
+
+	mode = thp7312_find_mode(mbus_fmt->width, mbus_fmt->height, true);
+
+	fmt = v4l2_subdev_get_pad_format(&thp7312->sd, sd_state, 0);
+
+	fmt->code = mbus_fmt->code;
+	fmt->width = mode->width;
+	fmt->height = mode->height;
+	fmt->colorspace = V4L2_COLORSPACE_SRGB;
+	fmt->ycbcr_enc = V4L2_MAP_YCBCR_ENC_DEFAULT(fmt->colorspace);
+	fmt->quantization = V4L2_QUANTIZATION_FULL_RANGE;
+	fmt->xfer_func = V4L2_MAP_XFER_FUNC_DEFAULT(fmt->colorspace);
+
+	*mbus_fmt = *fmt;
+
+	if (format->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
+		thp7312->current_mode = mode;
+		thp7312->current_rate = &mode->rates[0];
+	}
+
+	return 0;
+}
+
+static int thp7312_g_frame_interval(struct v4l2_subdev *sd,
+				    struct v4l2_subdev_frame_interval *fi)
+{
+	struct thp7312_device *thp7312 = to_thp7312_dev(sd);
+	struct v4l2_subdev_state *sd_state;
+
+	sd_state = v4l2_subdev_lock_and_get_active_state(sd);
+	fi->interval.numerator = 1;
+	fi->interval.denominator = thp7312->current_rate->fps;
+	v4l2_subdev_unlock_state(sd_state);
+
+	return 0;
+}
+
+static int thp7312_s_frame_interval(struct v4l2_subdev *sd,
+				    struct v4l2_subdev_frame_interval *fi)
+{
+	struct thp7312_device *thp7312 = to_thp7312_dev(sd);
+	const struct thp7312_mode_info *mode;
+	const struct thp7312_frame_rate *best_rate = NULL;
+	const struct thp7312_frame_rate *rate;
+	struct v4l2_subdev_state *sd_state;
+	unsigned int best_delta = UINT_MAX;
+	unsigned int fps;
+
+	/* Avoid divisions by 0, pick the highest frame if the interval is 0. */
+	fps = fi->interval.numerator
+	    ? DIV_ROUND_CLOSEST(fi->interval.denominator, fi->interval.numerator)
+	    : UINT_MAX;
+
+	sd_state = v4l2_subdev_lock_and_get_active_state(sd);
+
+	mode = thp7312->current_mode;
+
+	for (rate = mode->rates; rate->fps && best_delta; ++rate) {
+		unsigned int delta = abs(rate->fps - fps);
+
+		if (delta <= best_delta) {
+			best_delta = delta;
+			best_rate = rate;
+		}
+	}
+
+	thp7312->current_rate = best_rate;
+
+	v4l2_subdev_unlock_state(sd_state);
+
+	fi->interval.numerator = 1;
+	fi->interval.denominator = best_rate->fps;
+
+	return 0;
+}
+
+static int thp7312_s_stream(struct v4l2_subdev *sd, int enable)
+{
+	struct thp7312_device *thp7312 = to_thp7312_dev(sd);
+	struct v4l2_subdev_state *sd_state;
+	int ret;
+
+	sd_state = v4l2_subdev_lock_and_get_active_state(sd);
+
+	if (!enable) {
+		thp7312_stream_enable(thp7312, enable);
+		pm_runtime_put(thp7312->dev);
+		v4l2_subdev_unlock_state(sd_state);
+		return 0;
+	}
+
+	ret = pm_runtime_resume_and_get(thp7312->dev);
+	if (ret)
+		goto finish_unlock;
+
+	ret = thp7312_set_mipi_lanes(thp7312);
+	if (ret)
+		goto finish_pm;
+
+	ret = thp7312_init_mode(thp7312, sd_state);
+	if (ret)
+		goto finish_pm;
+
+	ret = __v4l2_ctrl_handler_setup(&thp7312->ctrl_handler);
+	if (ret)
+		goto finish_pm;
+
+	ret = thp7312_stream_enable(thp7312, enable);
+	if (ret)
+		goto finish_pm;
+
+	goto finish_unlock;
+
+finish_pm:
+	pm_runtime_put(thp7312->dev);
+finish_unlock:
+	v4l2_subdev_unlock_state(sd_state);
+
+	return ret;
+}
+
+static int thp7312_init_cfg(struct v4l2_subdev *sd,
+			    struct v4l2_subdev_state *sd_state)
+{
+	const struct thp7312_mode_info *default_mode = &thp7312_mode_info_data[0];
+	struct v4l2_mbus_framefmt *fmt;
+
+	fmt = v4l2_subdev_get_pad_format(sd, sd_state, 0);
+
+	/*
+	 * default init sequence initialize thp7312 to
+	 * YUV422 YUYV VGA@30fps
+	 */
+	fmt->code = MEDIA_BUS_FMT_YUYV8_1X16;
+	fmt->colorspace = V4L2_COLORSPACE_SRGB;
+	fmt->ycbcr_enc = V4L2_MAP_YCBCR_ENC_DEFAULT(fmt->colorspace);
+	fmt->quantization = V4L2_QUANTIZATION_FULL_RANGE;
+	fmt->xfer_func = V4L2_MAP_XFER_FUNC_DEFAULT(fmt->colorspace);
+	fmt->width = default_mode->width;
+	fmt->height = default_mode->height;
+	fmt->field = V4L2_FIELD_NONE;
+
+	return 0;
+}
+
+static const struct v4l2_subdev_core_ops thp7312_core_ops = {
+	.log_status = v4l2_ctrl_subdev_log_status,
+	.subscribe_event = v4l2_ctrl_subdev_subscribe_event,
+	.unsubscribe_event = v4l2_event_subdev_unsubscribe,
+};
+
+static const struct v4l2_subdev_video_ops thp7312_video_ops = {
+	.g_frame_interval = thp7312_g_frame_interval,
+	.s_frame_interval = thp7312_s_frame_interval,
+	.s_stream = thp7312_s_stream,
+};
+
+static const struct v4l2_subdev_pad_ops thp7312_pad_ops = {
+	.enum_mbus_code = thp7312_enum_mbus_code,
+	.init_cfg = thp7312_init_cfg,
+	.get_fmt = v4l2_subdev_get_fmt,
+	.set_fmt = thp7312_set_fmt,
+	.enum_frame_size = thp7312_enum_frame_size,
+	.enum_frame_interval = thp7312_enum_frame_interval,
+};
+
+static const struct v4l2_subdev_ops thp7312_subdev_ops = {
+	.core = &thp7312_core_ops,
+	.video = &thp7312_video_ops,
+	.pad = &thp7312_pad_ops,
+};
+
+/* -----------------------------------------------------------------------------
+ * V4L2 Control Operations
+ */
+
+static inline struct thp7312_device *to_thp7312_from_ctrl(struct v4l2_ctrl *ctrl)
+{
+	return container_of(ctrl->handler, struct thp7312_device, ctrl_handler);
+}
+
+/* 0: 3000cm, 18: 8cm */
+static const u16 thp7312_focus_values[] = {
+	3000, 1000, 600, 450, 350,
+	290,  240,  200, 170, 150,
+	140,  130,  120, 110, 100,
+	93,   87,   83,  80,
+};
+
+static int thp7312_set_focus(struct thp7312_device *thp7312)
+{
+	enum thp7312_focus_state new_state;
+	bool continuous;
+	u8 af_control;
+	u8 af_setting;
+	int ret = 0;
+
+	/* Start by programming the manual focus position if it has changed. */
+	if (thp7312->focus_absolute->is_new) {
+		unsigned int value;
+
+		value = thp7312_focus_values[thp7312->focus_absolute->val];
+
+		ret = cci_write(thp7312->regmap,
+				THP7312_REG_MANUAL_FOCUS_POSITION, value, NULL);
+		if (ret)
+			return ret;
+	}
+
+	/* Calculate the new focus state. */
+	switch (thp7312->focus_state) {
+	case THP7312_FOCUS_STATE_MANUAL:
+	default:
+		if (thp7312->focus_auto->val)
+			new_state = THP7312_FOCUS_STATE_AUTO;
+		else if (thp7312->focus_start->is_new)
+			new_state = THP7312_FOCUS_STATE_ONESHOT;
+		break;
+
+	case THP7312_FOCUS_STATE_AUTO:
+		if (!thp7312->focus_auto->val)
+			new_state = THP7312_FOCUS_STATE_LOCKED;
+		break;
+
+	case THP7312_FOCUS_STATE_LOCKED:
+		if (thp7312->focus_auto->val)
+			new_state = THP7312_FOCUS_STATE_AUTO;
+		else if (thp7312->focus_start->is_new)
+			new_state = THP7312_FOCUS_STATE_ONESHOT;
+		else if (thp7312->focus_absolute->is_new)
+			new_state = THP7312_FOCUS_STATE_MANUAL;
+		break;
+
+	case THP7312_FOCUS_STATE_ONESHOT:
+		if (thp7312->focus_auto->val)
+			new_state = THP7312_FOCUS_STATE_AUTO;
+		else if (thp7312->focus_start->is_new)
+			new_state = THP7312_FOCUS_STATE_ONESHOT;
+		else if (thp7312->focus_absolute->is_new)
+			new_state = THP7312_FOCUS_STATE_MANUAL;
+		break;
+	}
+
+	/*
+	 * If neither the state nor the focus method has changed, and no new
+	 * one-shot focus is requested, there's nothing new to program to the
+	 * hardware.
+	 */
+	if (thp7312->focus_state == new_state &&
+	    !thp7312->focus_method->is_new && !thp7312->focus_start->is_new)
+		return 0;
+
+	continuous = new_state == THP7312_FOCUS_STATE_MANUAL ||
+		     new_state == THP7312_FOCUS_STATE_ONESHOT;
+
+	switch (thp7312->focus_method->val) {
+	case THP7312_FOCUS_METHOD_CONTRAST:
+	default:
+		af_setting = continuous
+			   ? THP7312_REG_AF_SETTING_CONTINUOUS_CONTRAST
+			   : THP7312_REG_AF_SETTING_ONESHOT_CONTRAST;
+		break;
+	case THP7312_FOCUS_METHOD_PDAF:
+		af_setting = continuous
+			   ? THP7312_REG_AF_SETTING_CONTINUOUS_PDAF
+			   : THP7312_REG_AF_SETTING_ONESHOT_PDAF;
+		break;
+	case THP7312_FOCUS_METHOD_HYBRID:
+		af_setting = continuous
+			   ? THP7312_REG_AF_SETTING_CONTINUOUS_HYBRID
+			   : THP7312_REG_AF_SETTING_ONESHOT_HYBRID;
+		break;
+	}
+
+	switch (new_state) {
+	case THP7312_FOCUS_STATE_MANUAL:
+	default:
+		af_control = THP7312_REG_AF_CONTROL_MANUAL;
+		break;
+	case THP7312_FOCUS_STATE_AUTO:
+	case THP7312_FOCUS_STATE_ONESHOT:
+		af_control = THP7312_REG_AF_CONTROL_AF;
+		break;
+	case THP7312_FOCUS_STATE_LOCKED:
+		af_control = THP7312_REG_AF_CONTROL_LOCK;
+		break;
+	}
+
+	cci_write(thp7312->regmap, THP7312_REG_AF_SETTING, af_setting, &ret);
+
+	if (new_state == THP7312_FOCUS_STATE_MANUAL &&
+	    (thp7312->focus_state == THP7312_FOCUS_STATE_AUTO ||
+	     thp7312->focus_state == THP7312_FOCUS_STATE_ONESHOT)) {
+		/* When switching to manual state, lock AF first. */
+		cci_write(thp7312->regmap, THP7312_REG_AF_CONTROL,
+			  THP7312_REG_AF_CONTROL_LOCK, &ret);
+	}
+
+	cci_write(thp7312->regmap, THP7312_REG_AF_CONTROL, af_control, &ret);
+
+	if (ret)
+		return ret;
+
+	thp7312->focus_state = new_state;
+
+	return 0;
+}
+
+static int thp7312_s_ctrl(struct v4l2_ctrl *ctrl)
+{
+	struct thp7312_device *thp7312 = to_thp7312_from_ctrl(ctrl);
+	struct device *dev = thp7312->dev;
+	int ret = 0;
+	u8 value;
+
+	if (ctrl->flags & V4L2_CTRL_FLAG_INACTIVE)
+		return -EINVAL;
+
+	dev_dbg(dev, "s_ctrl id %s, value %d\n", ctrl->name, ctrl->val);
+
+	if (!pm_runtime_get_if_in_use(dev))
+		return 0;
+
+	switch (ctrl->id) {
+	case V4L2_CID_BRIGHTNESS:
+		value = clamp_t(int, ctrl->val, -10, 10) + 10;
+		cci_write(thp7312->regmap, THP7312_REG_BRIGHTNESS, value, &ret);
+		break;
+
+	case V4L2_CID_THP7312_LOW_LIGHT_COMPENSATION:
+		/* 0 = Auto adjust frame rate, 1 = Fix frame rate */
+		value = ctrl->val ? 0 : 1;
+		cci_write(thp7312->regmap, THP7312_REG_AE_FIX_FRAME_RATE, value,
+			  &ret);
+		break;
+
+	case V4L2_CID_FOCUS_AUTO:
+	case V4L2_CID_FOCUS_ABSOLUTE:
+	case V4L2_CID_AUTO_FOCUS_START:
+	case V4L2_CID_THP7312_AUTO_FOCUS_METHOD:
+		ret = thp7312_set_focus(thp7312);
+		break;
+
+	case V4L2_CID_ROTATE:
+		if (ctrl->val == 0)
+			value = 0; /* 0 degree. camera is set to normal.*/
+		else
+			value = 3; /* 180 degree. camera is set to flip & mirror */
+
+		cci_write(thp7312->regmap, THP7312_REG_FLIP_MIRROR, value, &ret);
+		break;
+
+	case V4L2_CID_THP7312_NOISE_REDUCTION_AUTO:
+	case V4L2_CID_THP7312_NOISE_REDUCTION_ABSOLUTE:
+		/* Ignore the manually set value if auto has been set */
+		value = thp7312->noise_reduction_auto->val
+		      ? 0 : 0x80 | (thp7312->noise_reduction_absolute->val & 0x7f);
+
+		cci_write(thp7312->regmap, THP7312_REG_NOISE_REDUCTION, value,
+			  &ret);
+		break;
+
+	case V4L2_CID_AUTO_WHITE_BALANCE:
+		value = ctrl->val ? THP7312_WB_MODE_AUTO : THP7312_WB_MODE_MANUAL;
+
+		cci_write(thp7312->regmap, THP7312_REG_WB_MODE, value, &ret);
+		break;
+
+	case V4L2_CID_RED_BALANCE:
+		cci_write(thp7312->regmap, THP7312_REG_MANUAL_WB_RED_GAIN,
+			  ctrl->val, &ret);
+		break;
+
+	case V4L2_CID_BLUE_BALANCE:
+		cci_write(thp7312->regmap, THP7312_REG_MANUAL_WB_BLUE_GAIN,
+			  ctrl->val, &ret);
+		break;
+
+	case V4L2_CID_AUTO_EXPOSURE_BIAS:
+		cci_write(thp7312->regmap, THP7312_REG_AE_EXPOSURE_COMPENSATION,
+			  ctrl->val, &ret);
+		break;
+
+	case V4L2_CID_POWER_LINE_FREQUENCY:
+		if (ctrl->val == V4L2_CID_POWER_LINE_FREQUENCY_60HZ) {
+			value = THP7312_AE_FLICKER_MODE_60;
+		} else if (ctrl->val == V4L2_CID_POWER_LINE_FREQUENCY_50HZ) {
+			value = THP7312_AE_FLICKER_MODE_50;
+		} else {
+			if (thp7312->fw_major_version == 40 && thp7312->fw_minor_version == 03) {
+				/* THP7312_AE_FLICKER_MODE_DISABLE is not supported */
+				value = THP7312_AE_FLICKER_MODE_50;
+			} else {
+				value = THP7312_AE_FLICKER_MODE_DISABLE;
+			}
+		}
+
+		cci_write(thp7312->regmap, THP7312_REG_AE_FLICKER_MODE,
+			  value, &ret);
+		break;
+
+	case V4L2_CID_SATURATION:
+		cci_write(thp7312->regmap, THP7312_REG_SATURATION,
+			  ctrl->val, &ret);
+		break;
+
+	case V4L2_CID_CONTRAST:
+		cci_write(thp7312->regmap, THP7312_REG_CONTRAST,
+			  ctrl->val, &ret);
+		break;
+
+	case V4L2_CID_SHARPNESS:
+		cci_write(thp7312->regmap, THP7312_REG_SHARPNESS,
+			  ctrl->val, &ret);
+		break;
+
+	default:
+		break;
+	}
+
+	pm_runtime_put(dev);
+
+	return ret;
+}
+
+static const struct v4l2_ctrl_ops thp7312_ctrl_ops = {
+	.s_ctrl = thp7312_s_ctrl,
+};
+
+/*
+ * Refer to Documentation/userspace-api/media/drivers/thp7312.rst for details.
+ *
+ * TODO: Do we actually need this control, or could we hardcode the method to
+ * contrast-based when the sensor doesn't support PDAF (as it would be the only
+ * option in that case), and hybrid mode otherwise ?
+ */
+static const struct v4l2_ctrl_config thp7312_ctrl_focus_method = {
+	.ops = &thp7312_ctrl_ops,
+	.id = V4L2_CID_THP7312_AUTO_FOCUS_METHOD,
+	.name = "Auto-Focus Method",
+	.type = V4L2_CTRL_TYPE_INTEGER,
+	.min = 0,
+	.def = 2,
+	.max = 2,
+	.step = 1,
+};
+
+static const struct v4l2_ctrl_config thp7312_v4l2_ctrls_custom[] = {
+	{
+		.ops = &thp7312_ctrl_ops,
+		.id = V4L2_CID_THP7312_LOW_LIGHT_COMPENSATION,
+		.name = "Low Light Compensation",
+		.type = V4L2_CTRL_TYPE_BOOLEAN,
+		.min = 0,
+		.def = 1,
+		.max = 1,
+		.step = 1,
+	}, {
+		.ops = &thp7312_ctrl_ops,
+		.id = V4L2_CID_THP7312_NOISE_REDUCTION_AUTO,
+		.name = "Noise Reduction Auto",
+		.type = V4L2_CTRL_TYPE_BOOLEAN,
+		.min = 0,
+		.def = 1,
+		.max = 1,
+		.step = 1,
+	}, {
+		.ops = &thp7312_ctrl_ops,
+		.id = V4L2_CID_THP7312_NOISE_REDUCTION_ABSOLUTE,
+		.name = "Noise Reduction Level",
+		.type = V4L2_CTRL_TYPE_INTEGER,
+		.min = 0,
+		.def = 0,
+		.max = 10,
+		.step = 1,
+	},
+};
+
+static const s64 exp_bias_qmenu[] = {
+	-2000, -1667, -1333, -1000, -667, -333, 0, 333, 667, 1000, 1333, 1667, 2000
+};
+
+static int thp7312_init_controls(struct thp7312_device *thp7312)
+{
+	struct v4l2_ctrl_handler *hdl = &thp7312->ctrl_handler;
+	struct device *dev = thp7312->dev;
+	struct v4l2_fwnode_device_properties props;
+	unsigned int i;
+	int ret;
+
+	thp7312->focus_state = THP7312_FOCUS_STATE_MANUAL;
+
+	v4l2_ctrl_handler_init(hdl, 16 + ARRAY_SIZE(thp7312_v4l2_ctrls_custom));
+
+	/*
+	 * TODO: Don't expose focus controls if the sensor module doesn't have
+	 * focus support.
+	 */
+	thp7312->focus_auto = v4l2_ctrl_new_std(hdl, &thp7312_ctrl_ops,
+						V4L2_CID_FOCUS_AUTO,
+						0, 1, 1, 1);
+	thp7312->focus_absolute =
+		v4l2_ctrl_new_std(hdl, &thp7312_ctrl_ops, V4L2_CID_FOCUS_ABSOLUTE,
+				  0, ARRAY_SIZE(thp7312_focus_values), 1, 0);
+	thp7312->focus_method =
+		v4l2_ctrl_new_custom(hdl, &thp7312_ctrl_focus_method, NULL);
+
+	thp7312->focus_start = v4l2_ctrl_new_std(hdl, &thp7312_ctrl_ops,
+						 V4L2_CID_AUTO_FOCUS_START,
+						 1, 1, 1, 1);
+
+	v4l2_ctrl_cluster(4, &thp7312->focus_auto);
+
+	v4l2_ctrl_new_std(hdl, &thp7312_ctrl_ops, V4L2_CID_AUTO_WHITE_BALANCE,
+			  0, 1, 1, 1);
+	/* 32: 1x, 255: 7.95x */
+	v4l2_ctrl_new_std(hdl, &thp7312_ctrl_ops, V4L2_CID_RED_BALANCE,
+			  32, 255, 1, 64);
+	/* 32: 1x, 255: 7.95x */
+	v4l2_ctrl_new_std(hdl, &thp7312_ctrl_ops, V4L2_CID_BLUE_BALANCE,
+			  32, 255, 1, 50);
+
+	v4l2_ctrl_new_std(hdl, &thp7312_ctrl_ops, V4L2_CID_BRIGHTNESS,
+			  -10, 10, 1, 0);
+	v4l2_ctrl_new_std(hdl, &thp7312_ctrl_ops, V4L2_CID_SATURATION,
+			  0, 31, 1, 10);
+	v4l2_ctrl_new_std(hdl, &thp7312_ctrl_ops, V4L2_CID_CONTRAST,
+			  0, 20, 1, 10);
+	v4l2_ctrl_new_std(hdl, &thp7312_ctrl_ops, V4L2_CID_SHARPNESS,
+			  0, 31, 1, 8);
+
+	v4l2_ctrl_new_std(hdl, &thp7312_ctrl_ops, V4L2_CID_ROTATE,
+			  0, 180, 180, 0);
+
+	v4l2_ctrl_new_int_menu(hdl, &thp7312_ctrl_ops,
+			       V4L2_CID_AUTO_EXPOSURE_BIAS,
+			       ARRAY_SIZE(exp_bias_qmenu) - 1,
+			       ARRAY_SIZE(exp_bias_qmenu) / 2, exp_bias_qmenu);
+
+	v4l2_ctrl_new_std_menu(hdl, &thp7312_ctrl_ops,
+			       V4L2_CID_POWER_LINE_FREQUENCY,
+			       V4L2_CID_POWER_LINE_FREQUENCY_60HZ, 0,
+			       V4L2_CID_POWER_LINE_FREQUENCY_50HZ);
+
+	/* set properties from fwnode (e.g. rotation, orientation) */
+	ret = v4l2_fwnode_device_parse(dev, &props);
+	if (ret) {
+		dev_err(dev, "Failed to parse fwnode: %d\n", ret);
+		goto error;
+	}
+
+	ret = v4l2_ctrl_new_fwnode_properties(hdl, &thp7312_ctrl_ops, &props);
+	if (ret) {
+		dev_err(dev, "Failed to create new v4l2 ctrl for fwnode properties: %d\n", ret);
+		goto error;
+	}
+
+	for (i = 0; i < ARRAY_SIZE(thp7312_v4l2_ctrls_custom); i++) {
+		const struct v4l2_ctrl_config *ctrl_cfg =
+			&thp7312_v4l2_ctrls_custom[i];
+		struct v4l2_ctrl *ctrl;
+
+		ctrl = v4l2_ctrl_new_custom(hdl, ctrl_cfg, NULL);
+
+		if (ctrl_cfg->id == V4L2_CID_THP7312_NOISE_REDUCTION_AUTO)
+			thp7312->noise_reduction_auto = ctrl;
+		else if (ctrl_cfg->id == V4L2_CID_THP7312_NOISE_REDUCTION_ABSOLUTE)
+			thp7312->noise_reduction_absolute = ctrl;
+	}
+
+	v4l2_ctrl_cluster(2, &thp7312->noise_reduction_auto);
+
+	if (hdl->error) {
+		dev_err(dev, "v4l2_ctrl_handler error\n");
+		ret = hdl->error;
+		goto error;
+	}
+
+	return ret;
+
+error:
+	v4l2_ctrl_handler_free(hdl);
+	return ret;
+}
+
+/* -----------------------------------------------------------------------------
+ * Firmware Update
+ */
+
+/*
+ * The firmware data is made of 128kB of RAM firmware, followed by a
+ * variable-size "header". Both are stored in flash memory.
+ */
+#define THP7312_FW_RAM_SIZE			(128 * 1024)
+#define THP7312_FW_MIN_SIZE			(THP7312_FW_RAM_SIZE + 4)
+#define THP7312_FW_MAX_SIZE			(THP7312_FW_RAM_SIZE + 64 * 1024)
+
+/*
+ * Data is first uploaded to the THP7312 128kB SRAM, and then written to flash.
+ * The SRAM is exposed over I2C as 32kB banks, and up to 4kB of data can be
+ * transferred in a single I2C write.
+ */
+#define THP7312_RAM_BANK_SIZE			(32 * 1024)
+#define THP7312_FW_DOWNLOAD_UNIT		(4 * 1024)
+
+#define THP7312_FLASH_MEMORY_ERASE_TIMEOUT	40
+
+#define THP7312_FLASH_MAX_REG_READ_SIZE		10
+#define THP7312_FLASH_MAX_REG_DATA_SIZE		10
+
+static const u8 thp7312_cmd_config_flash_mem_if[] = {
+	0xd5, 0x18, 0x00, 0x00, 0x00, 0x80
+};
+
+static const u8 thp7312_cmd_write_to_reg[] = {
+	0xd5, 0x0c, 0x80, 0x00, 0x00, 0x00
+};
+
+static const u8 thp7312_cmd_read_reg[] = {
+	0xd5, 0x04
+};
+
+/*
+ * THP7312 Write data from RAM to Flash Memory
+ * Command ID FF700F
+ * Format: FF700F AA AA AA BB BB BB
+ * AA AA AA: destination start address
+ * BB BB BB: (write size - 1)
+ * Source address always starts from 0
+ */
+static const u8 thp7312_cmd_write_ram_to_flash[] = { 0xff, 0x70, 0x0f };
+
+/*
+ * THP7312 Calculate CRC command
+ * Command ID: FF70 09
+ * Format: FF70 09 AA AA AA BB BB BB
+ * AA AA AA: Start address of calculation
+ * BB BB BB: (calculate size - 1)
+ */
+static const u8 thp7312_cmd_calc_crc[] = { 0xff, 0x70, 0x09 };
+
+static const u8 thp7312_jedec_rdid[] = { SPINOR_OP_RDID, 0x00, 0x00, 0x00 };
+static const u8 thp7312_jedec_rdsr[] = { SPINOR_OP_RDSR, 0x00, 0x00, 0x00 };
+static const u8 thp7312_jedec_wen[] = { SPINOR_OP_WREN };
+
+static int thp7312_read_firmware_version(struct thp7312_device *thp7312)
+{
+	u64 val = 0;
+	int ret = 0;
+
+	cci_read(thp7312->regmap, THP7312_REG_FIRMWARE_VERSION_1, &val, &ret);
+	thp7312->fw_major_version = val;
+
+	cci_read(thp7312->regmap, THP7312_REG_FIRMWARE_VERSION_2, &val, &ret);
+	thp7312->fw_minor_version = val;
+
+	return ret;
+}
+
+static int thp7312_write_buf(struct thp7312_device *thp7312,
+			     const u8 *write_buf, u16 write_size)
+{
+	struct i2c_client *client = to_i2c_client(thp7312->dev);
+	int ret;
+
+	ret = i2c_master_send(client, write_buf, write_size);
+	return ret >= 0 ? 0 : ret;
+}
+
+static int __thp7312_flash_reg_write(struct thp7312_device *thp7312,
+				     const u8 *write_buf, u16 write_size)
+{
+	struct device *dev = thp7312->dev;
+	u8 temp_write_buf[THP7312_FLASH_MAX_REG_DATA_SIZE + 2];
+	int ret;
+
+	if (write_size > THP7312_FLASH_MAX_REG_DATA_SIZE) {
+		dev_err(dev, "%s: Write size error size = %d\n",
+			__func__, write_size);
+		return -EINVAL;
+	}
+
+	ret = thp7312_write_buf(thp7312, thp7312_cmd_config_flash_mem_if,
+				sizeof(thp7312_cmd_config_flash_mem_if));
+	if (ret < 0) {
+		dev_err(dev, "%s: Failed to config flash memory IF: %d\n",
+			__func__, ret);
+		return ret;
+	}
+
+	temp_write_buf[0] = 0xd5;
+	temp_write_buf[1] = 0x00;
+	memcpy((temp_write_buf + 2), write_buf, write_size);
+	ret = thp7312_write_buf(thp7312, temp_write_buf, write_size + 2);
+	if (ret < 0)
+		return ret;
+
+	thp7312_write_buf(thp7312, thp7312_cmd_write_to_reg,
+			  sizeof(thp7312_cmd_write_to_reg));
+
+	return 0;
+}
+
+static int __thp7312_flash_reg_read(struct thp7312_device *thp7312,
+				    const u8 *write_buf, u16 write_size,
+				    u8 *read_buf, u16 read_size)
+{
+	struct i2c_client *client = to_i2c_client(thp7312->dev);
+	struct i2c_msg msgs[2];
+	int ret;
+
+	ret = __thp7312_flash_reg_write(thp7312, write_buf, write_size);
+	if (ret)
+		return ret;
+
+	msgs[0].addr = client->addr;
+	msgs[0].flags = 0;
+	msgs[0].len = sizeof(thp7312_cmd_read_reg),
+	msgs[0].buf = (u8 *)thp7312_cmd_read_reg;
+
+	msgs[1].addr = client->addr;
+	msgs[1].flags = I2C_M_RD;
+	msgs[1].len = read_size;
+	msgs[1].buf = read_buf;
+
+	ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
+	return ret >= 0 ? 0 : ret;
+}
+
+#define thp7312_flash_reg_write(thp7312, wrbuf) \
+	__thp7312_flash_reg_write(thp7312, wrbuf, sizeof(wrbuf))
+
+#define thp7312_flash_reg_read(thp7312, wrbuf, rdbuf) \
+	__thp7312_flash_reg_read(thp7312, wrbuf, sizeof(wrbuf), \
+				 rdbuf, sizeof(rdbuf))
+
+static enum fw_upload_err thp7312_fw_prepare_config(struct thp7312_device *thp7312)
+{
+	struct device *dev = thp7312->dev;
+	int ret;
+
+	ret = cci_write(thp7312->regmap, THP7312_REG_FW_MEMORY_IO_SETTING,
+			THP7312_FW_MEMORY_IO_GPIO0, NULL);
+	if (ret) {
+		dev_err(dev, "Failed to set flash memory I/O\n");
+		return FW_UPLOAD_ERR_HW_ERROR;
+	}
+
+	/* Set max drivability. */
+	ret = cci_write(thp7312->regmap, THP7312_REG_FW_DRIVABILITY, 0x00777777,
+			NULL);
+	if (ret) {
+		dev_err(dev, "Failed to set drivability: %d\n", ret);
+		return FW_UPLOAD_ERR_HW_ERROR;
+	}
+
+	return FW_UPLOAD_ERR_NONE;
+}
+
+static enum fw_upload_err thp7312_fw_prepare_check(struct thp7312_device *thp7312)
+{
+	struct device *dev = thp7312->dev;
+	u8 read_buf[3] = { 0 };
+	int ret;
+
+	/* Get JEDEC ID */
+	ret = thp7312_flash_reg_read(thp7312, thp7312_jedec_rdid, read_buf);
+	if (ret) {
+		dev_err(dev, "Failed to get JEDEC ID: %d\n", ret);
+		return FW_UPLOAD_ERR_HW_ERROR;
+	}
+
+	dev_dbg(dev, "Flash Memory: JEDEC ID = 0x%x 0x%x 0x%x\n",
+		read_buf[0], read_buf[1], read_buf[2]);
+
+	return FW_UPLOAD_ERR_NONE;
+}
+
+static enum fw_upload_err thp7312_fw_prepare_reset(struct thp7312_device *thp7312)
+{
+	struct device *dev = thp7312->dev;
+	int ret;
+
+	ret = cci_write(thp7312->regmap, THP7312_REG_FW_RESET_FLASH, 0x81, NULL);
+	if (ret) {
+		dev_err(dev, "Failed to reset flash memory: %d\n", ret);
+		return FW_UPLOAD_ERR_HW_ERROR;
+	}
+
+	return FW_UPLOAD_ERR_NONE;
+}
+
+/* TODO: Erase only the amount of blocks necessary */
+static enum fw_upload_err thp7312_flash_erase(struct thp7312_device *thp7312)
+{
+	struct device *dev = thp7312->dev;
+	u8 read_buf[1] = { 0 };
+	unsigned int i;
+	u8 block;
+	int ret;
+
+	for (block = 0; block < 3; block++) {
+		const u8 jedec_se[] = { SPINOR_OP_SE, block, 0x00, 0x00 };
+
+		ret = thp7312_flash_reg_write(thp7312, thp7312_jedec_wen);
+		if (ret < 0) {
+			dev_err(dev, "Failed to enable flash for writing\n");
+			return FW_UPLOAD_ERR_RW_ERROR;
+		}
+
+		ret = thp7312_flash_reg_write(thp7312, jedec_se);
+		if (ret < 0) {
+			dev_err(dev, "Failed to erase flash sector\n");
+			return FW_UPLOAD_ERR_RW_ERROR;
+		}
+
+		for (i = 0; i < THP7312_FLASH_MEMORY_ERASE_TIMEOUT; i++) {
+			usleep_range(100000, 101000);
+			thp7312_flash_reg_read(thp7312, thp7312_jedec_rdsr,
+					       read_buf);
+
+			/* Check Busy bit. Busy == 0x0 means erase complete. */
+			if (!(read_buf[0] & SR_WIP))
+				break;
+		}
+
+		if (i == THP7312_FLASH_MEMORY_ERASE_TIMEOUT)
+			return FW_UPLOAD_ERR_TIMEOUT;
+	}
+
+	thp7312_flash_reg_read(thp7312, thp7312_jedec_rdsr, read_buf);
+
+	/* Check WEL bit. */
+	if (read_buf[0] & SR_WEL)
+		return FW_UPLOAD_ERR_HW_ERROR;
+
+	return FW_UPLOAD_ERR_NONE;
+}
+
+static enum fw_upload_err
+thp7312_write_download_data_by_unit(struct thp7312_device *thp7312,
+				    unsigned int addr, const u8 *data,
+				    unsigned int size)
+{
+	struct device *dev = thp7312->dev;
+	u8 *write_buf = thp7312->fw_write_buf;
+	int ret;
+
+	dev_dbg(dev, "%s: addr = 0x%04x, data = 0x%p, size = %u\n",
+		__func__, addr, data, size);
+
+	write_buf[0] = (addr >> 8) & 0xff;
+	write_buf[1] = (addr >> 0) & 0xff;
+	memcpy(&write_buf[2], data, size);
+
+	/*
+	 * THP7312 Firmware download to RAM
+	 * Command ID (address to download): 0x0000 - 0x7fff
+	 * Format:: 0000 XX XX XX ........ XX
+	 */
+	ret = thp7312_write_buf(thp7312, write_buf, size + 2);
+	if (ret < 0)
+		dev_err(dev, "Unit transfer ERROR %s(): ret = %d\n", __func__, ret);
+
+	return ret >= 0 ? FW_UPLOAD_ERR_NONE : FW_UPLOAD_ERR_RW_ERROR;
+}
+
+static enum fw_upload_err thp7312_fw_load_to_ram(struct thp7312_device *thp7312,
+						 const u8 *data, u32 size)
+{
+	struct device *dev = thp7312->dev;
+	enum fw_upload_err ret;
+	unsigned int num_banks;
+	unsigned int i, j;
+
+	num_banks = DIV_ROUND_UP(size, THP7312_RAM_BANK_SIZE);
+
+	dev_dbg(dev, "%s: loading %u bytes in SRAM (%u banks)\n", __func__,
+		size, num_banks);
+
+	for (i = 0; i < num_banks; i++) {
+		const u32 bank_addr = 0x10000000 | (i * THP7312_RAM_BANK_SIZE);
+		unsigned int bank_size;
+		unsigned int num_chunks;
+
+		ret = cci_write(thp7312->regmap, THP7312_REG_FW_DEST_BANK_ADDR,
+				bank_addr, NULL);
+		if (ret)
+			return FW_UPLOAD_ERR_HW_ERROR;
+
+		bank_size = min_t(u32, size, THP7312_RAM_BANK_SIZE);
+		num_chunks = DIV_ROUND_UP(bank_size, THP7312_FW_DOWNLOAD_UNIT);
+
+		dev_dbg(dev, "%s: loading %u bytes in SRAM bank %u (%u chunks)\n",
+			__func__, bank_size, i, num_chunks);
+
+		for (j = 0 ; j < num_chunks; j++) {
+			unsigned int chunk_addr;
+			unsigned int chunk_size;
+
+			chunk_addr = j * THP7312_FW_DOWNLOAD_UNIT;
+			chunk_size = min_t(u32, size, THP7312_FW_DOWNLOAD_UNIT);
+
+			ret = thp7312_write_download_data_by_unit(thp7312, chunk_addr,
+								  data, chunk_size);
+			if (ret != FW_UPLOAD_ERR_NONE) {
+				dev_err(dev, "Unit transfer ERROR at bank transfer %s(): %d\n",
+					__func__, j);
+				return ret;
+			}
+
+			data += chunk_size;
+			size -= chunk_size;
+		}
+	}
+
+	return FW_UPLOAD_ERR_NONE;
+}
+
+static enum fw_upload_err thp7312_fw_write_to_flash(struct thp7312_device *thp7312,
+						    u32 dest, u32 write_size)
+{
+	u8 command[sizeof(thp7312_cmd_write_ram_to_flash) + 6];
+	static const u32 cmd_size = sizeof(thp7312_cmd_write_ram_to_flash);
+	u64 val;
+	int ret;
+
+	memcpy(command, thp7312_cmd_write_ram_to_flash, cmd_size);
+
+	command[cmd_size] = (dest & 0xff0000) >> 16;
+	command[cmd_size + 1] = (dest & 0x00ff00) >> 8;
+	command[cmd_size + 2] = (dest & 0x0000ff);
+	command[cmd_size + 3] = ((write_size - 1) & 0xff0000) >> 16;
+	command[cmd_size + 4] = ((write_size - 1) & 0x00ff00) >> 8;
+	command[cmd_size + 5] = ((write_size - 1) & 0x0000ff);
+
+	ret = thp7312_write_buf(thp7312, command, sizeof(command));
+	if (ret < 0)
+		return FW_UPLOAD_ERR_RW_ERROR;
+
+	usleep_range(8000000, 8100000);
+
+	ret = cci_read(thp7312->regmap, THP7312_REG_FW_VERIFY_RESULT, &val,
+		       NULL);
+	if (ret < 0)
+		return FW_UPLOAD_ERR_RW_ERROR;
+
+	return val ?  FW_UPLOAD_ERR_HW_ERROR : FW_UPLOAD_ERR_NONE;
+}
+
+static enum fw_upload_err thp7312_fw_check_crc(struct thp7312_device *thp7312,
+					       const u8 *fw_data, u32 fw_size)
+{
+	struct device *dev = thp7312->dev;
+	u16 header_size = fw_size - THP7312_FW_RAM_SIZE;
+	u8 command[sizeof(thp7312_cmd_calc_crc) + 6];
+	static const u32 cmd_size = sizeof(thp7312_cmd_calc_crc);
+	u32 size = THP7312_FW_RAM_SIZE - 4;
+	u32 fw_crc;
+	u64 crc;
+	int ret;
+
+	memcpy(command, thp7312_cmd_calc_crc, cmd_size);
+
+	command[cmd_size] = 0;
+	command[cmd_size + 1] = (header_size >> 8) & 0xff;
+	command[cmd_size + 2] = header_size & 0xff;
+
+	command[cmd_size + 3] = (size >> 16) & 0xff;
+	command[cmd_size + 4] = (size >> 8) & 0xff;
+	command[cmd_size + 5] = size & 0xff;
+
+	ret = thp7312_write_buf(thp7312, command, sizeof(command));
+	if (ret < 0)
+		return FW_UPLOAD_ERR_RW_ERROR;
+
+	usleep_range(2000000, 2100000);
+
+	fw_crc = get_unaligned_be32(&fw_data[fw_size - 4]);
+
+	ret = cci_read(thp7312->regmap, THP7312_REG_FW_CRC_RESULT, &crc, NULL);
+	if (ret < 0)
+		return FW_UPLOAD_ERR_RW_ERROR;
+
+	if (fw_crc != crc) {
+		dev_err(dev, "CRC mismatch: firmware 0x%08x, flash 0x%08llx\n",
+			fw_crc, crc);
+		return FW_UPLOAD_ERR_HW_ERROR;
+	}
+
+	return FW_UPLOAD_ERR_NONE;
+}
+
+static enum fw_upload_err thp7312_fw_prepare(struct fw_upload *fw_upload,
+					     const u8 *data, u32 size)
+{
+	struct thp7312_device *thp7312 = fw_upload->dd_handle;
+	struct device *dev = thp7312->dev;
+	enum fw_upload_err ret;
+
+	mutex_lock(&thp7312->fw_lock);
+	thp7312->fw_cancel = false;
+	mutex_unlock(&thp7312->fw_lock);
+
+	if (size < THP7312_FW_MIN_SIZE || size > THP7312_FW_MAX_SIZE) {
+		dev_err(dev, "%s: Invalid firmware size %d; must be between %d and %d\n",
+			__func__, size, THP7312_FW_MIN_SIZE, THP7312_FW_MAX_SIZE);
+		return FW_UPLOAD_ERR_INVALID_SIZE;
+	}
+
+	ret = thp7312_fw_prepare_config(thp7312);
+	if (ret != FW_UPLOAD_ERR_NONE)
+		return ret;
+
+	ret = thp7312_fw_prepare_check(thp7312);
+	if (ret != FW_UPLOAD_ERR_NONE)
+		return ret;
+
+	ret = thp7312_fw_prepare_reset(thp7312);
+	if (ret != FW_UPLOAD_ERR_NONE)
+		return ret;
+
+	mutex_lock(&thp7312->fw_lock);
+	ret = thp7312->fw_cancel ? FW_UPLOAD_ERR_CANCELED : FW_UPLOAD_ERR_NONE;
+	mutex_unlock(&thp7312->fw_lock);
+
+	return ret;
+}
+
+static enum fw_upload_err thp7312_fw_write(struct fw_upload *fw_upload,
+					   const u8 *data, u32 offset,
+					   u32 size, u32 *written)
+{
+	struct thp7312_device *thp7312 = fw_upload->dd_handle;
+	struct device *dev = thp7312->dev;
+	u16 header_size = size - THP7312_FW_RAM_SIZE;
+	enum fw_upload_err ret;
+
+	mutex_lock(&thp7312->fw_lock);
+	if (thp7312->fw_cancel)
+		return FW_UPLOAD_ERR_CANCELED;
+	mutex_unlock(&thp7312->fw_lock);
+
+	ret = thp7312_flash_erase(thp7312);
+	if (ret != FW_UPLOAD_ERR_NONE)
+		return ret;
+
+	ret = thp7312_fw_load_to_ram(thp7312, data, THP7312_FW_RAM_SIZE);
+	if (ret != FW_UPLOAD_ERR_NONE)
+		return ret;
+
+	ret = thp7312_fw_write_to_flash(thp7312, 0, 0x1ffff);
+	if (ret != FW_UPLOAD_ERR_NONE)
+		return ret;
+
+	ret = thp7312_fw_load_to_ram(thp7312, data + THP7312_FW_RAM_SIZE, header_size);
+	if (ret != FW_UPLOAD_ERR_NONE)
+		return ret;
+
+	ret = thp7312_fw_write_to_flash(thp7312, 0x20000, header_size - 1);
+	if (ret != FW_UPLOAD_ERR_NONE)
+		return ret;
+
+	ret = thp7312_fw_check_crc(thp7312, data, size);
+	if (ret != FW_UPLOAD_ERR_NONE)
+		return ret;
+
+	dev_info(dev, "Successfully wrote firmware\n");
+
+	*written = size;
+	return FW_UPLOAD_ERR_NONE;
+}
+
+static enum fw_upload_err thp7312_fw_poll_complete(struct fw_upload *fw_upload)
+{
+	return FW_UPLOAD_ERR_NONE;
+}
+
+/*
+ * This may be called asynchronously with an on-going update.  All other
+ * functions are called sequentially in a single thread. To avoid contention on
+ * register accesses, only update the cancel_request flag. Other functions will
+ * check this flag and handle the cancel request synchronously.
+ */
+static void thp7312_fw_cancel(struct fw_upload *fw_upload)
+{
+	struct thp7312_device *thp7312 = fw_upload->dd_handle;
+
+	mutex_lock(&thp7312->fw_lock);
+	thp7312->fw_cancel = true;
+	mutex_unlock(&thp7312->fw_lock);
+}
+
+static const struct fw_upload_ops thp7312_fw_upload_ops = {
+	.prepare = thp7312_fw_prepare,
+	.write = thp7312_fw_write,
+	.poll_complete = thp7312_fw_poll_complete,
+	.cancel = thp7312_fw_cancel,
+};
+
+static int thp7312_register_flash_mode(struct thp7312_device *thp7312)
+{
+	struct device *dev = thp7312->dev;
+	struct fw_upload *fwl;
+	u64 val;
+	int ret;
+
+	dev_info(dev, "booted in flash mode\n");
+
+	mutex_init(&thp7312->fw_lock);
+
+	thp7312->fw_write_buf = devm_kzalloc(dev, THP7312_FW_DOWNLOAD_UNIT + 2,
+					     GFP_KERNEL);
+	if (!thp7312->fw_write_buf)
+		return -ENOMEM;
+
+	ret = __thp7312_power_on(thp7312);
+	if (ret < 0)
+		return dev_err_probe(dev, ret, "Failed to power on\n");
+
+	ret = cci_read(thp7312->regmap, THP7312_REG_FW_STATUS, &val, NULL);
+	if (ret) {
+		dev_err_probe(dev, ret, "Camera status read failed\n");
+		goto error;
+	}
+
+	fwl = firmware_upload_register(THIS_MODULE, dev, "thp7312-firmware",
+				       &thp7312_fw_upload_ops, thp7312);
+	if (IS_ERR(fwl)) {
+		ret = PTR_ERR(fwl);
+		dev_err_probe(dev, ret, "Failed to register firmware upload\n");
+		goto error;
+	}
+
+	thp7312->fwl = fwl;
+	return 0;
+
+error:
+	thp7312_power_off(thp7312);
+	return ret;
+}
+
+/* -----------------------------------------------------------------------------
+ * Probe & Remove
+ */
+
+static int thp7312_get_regulators(struct thp7312_device *thp7312)
+{
+	unsigned int i;
+
+	for (i = 0; i < THP7312_NUM_SUPPLIES; i++)
+		thp7312->supplies[i].supply = thp7312_supply_name[i];
+
+	return devm_regulator_bulk_get(thp7312->dev,
+				       THP7312_NUM_SUPPLIES,
+				       thp7312->supplies);
+}
+
+static void thp7312_sensor_dev_release(struct device *dev)
+{
+	of_node_put(dev->of_node);
+	kfree(dev);
+}
+
+static int thp7312_sensor_init(struct thp7312_sensor *sensor, unsigned int index)
+{
+	struct thp7312_device *thp7312 = sensor->thp7312;
+	struct device *dev = thp7312->dev;
+	unsigned int i;
+	int ret;
+
+	sensor->index = index;
+
+	/*
+	 * Register a device for the sensor, to support usage of the regulator
+	 * API.
+	 */
+	sensor->dev = kzalloc(sizeof(*sensor->dev), GFP_KERNEL);
+	if (!sensor->dev)
+		return -ENOMEM;
+
+	sensor->dev->parent = dev;
+	sensor->dev->of_node = of_node_get(sensor->of_node);
+	sensor->dev->release = &thp7312_sensor_dev_release;
+	dev_set_name(sensor->dev, "%s-%s.%u", dev_name(dev),
+		     thp7312->sensor_info->name, index);
+
+	ret = device_register(sensor->dev);
+	if (ret < 0) {
+		dev_err(dev, "Failed to register device for sensor %u\n", index);
+		put_device(sensor->dev);
+		sensor->dev = NULL;
+		return ret;
+	}
+
+	/* Retrieve the power supplies for the sensor, if any. */
+	if (thp7312->sensor_info->supplies) {
+		const struct thp7312_sensor_supply *supplies =
+			thp7312->sensor_info->supplies;
+		unsigned int num_supplies;
+
+		for (num_supplies = 0; supplies[num_supplies].name; ++num_supplies)
+			;
+
+		sensor->supplies = devm_kcalloc(dev, num_supplies,
+						sizeof(*sensor->supplies),
+						GFP_KERNEL);
+		if (!sensor->supplies) {
+			ret = -ENOMEM;
+			goto error;
+		}
+
+		for (i = 0; i < num_supplies; ++i)
+			sensor->supplies[i].supply = supplies[i].name;
+
+		ret = regulator_bulk_get(sensor->dev, num_supplies,
+					 sensor->supplies);
+		if (ret < 0) {
+			dev_err(dev, "Failed to get supplies for sensor %u\n", index);
+			goto error;
+		}
+
+		sensor->num_supplies = i;
+	}
+
+	return 0;
+
+error:
+	device_unregister(sensor->dev);
+	return ret;
+}
+
+static int thp7312_init_sensors(struct thp7312_device *thp7312)
+{
+	unsigned int i;
+	int ret;
+
+	for (i = 0; i < ARRAY_SIZE(thp7312->sensors); i++) {
+		struct thp7312_sensor *sensor = &thp7312->sensors[i];
+
+		if (!sensor->thp7312)
+			continue;
+
+		ret = thp7312_sensor_init(sensor, i);
+		if (ret < 0)
+			return ret;
+	}
+
+	return 0;
+}
+
+static void thp7312_sensor_cleanup(struct thp7312_sensor *sensor)
+{
+	if (sensor->num_supplies)
+		regulator_bulk_free(sensor->num_supplies, sensor->supplies);
+
+	if (sensor->dev)
+		device_unregister(sensor->dev);
+	of_node_put(sensor->of_node);
+}
+
+static void thp7312_remove_sensors(struct thp7312_device *thp7312)
+{
+	unsigned int i;
+
+	for (i = 0; i < ARRAY_SIZE(thp7312->sensors); i++) {
+		struct thp7312_sensor *sensor = &thp7312->sensors[i];
+
+		if (!sensor->thp7312)
+			continue;
+
+		thp7312_sensor_cleanup(sensor);
+	}
+}
+
+static int thp7312_sensor_parse_dt(struct thp7312_device *thp7312,
+				   struct device_node *node)
+{
+	struct device *dev = thp7312->dev;
+	struct thp7312_sensor *sensor;
+	u32 data_lanes_rx[4];
+	const char *model;
+	unsigned int i;
+	u32 reg;
+	int ret;
+
+	if (!of_device_is_available(node))
+		return -ENODEV;
+
+	/* Retrieve the sensor index from the reg property. */
+	ret = of_property_read_u32(node, "reg", &reg);
+	if (ret < 0) {
+		dev_err(dev, "'reg' property missing in sensor node\n");
+		return -EINVAL;
+	}
+
+	if (reg >= ARRAY_SIZE(thp7312->sensors)) {
+		dev_err(dev, "Out-of-bounds 'reg' value %u\n", reg);
+		return -EINVAL;
+	}
+
+	sensor = &thp7312->sensors[reg];
+	if (sensor->thp7312) {
+		dev_err(dev, "Duplicate entry for sensor %u\n", reg);
+		return -EINVAL;
+	}
+
+	ret = of_property_read_string(node, "thine,model", &model);
+	if (ret < 0) {
+		dev_err(dev, "'thine,model' property missing in sensor node\n");
+		return -EINVAL;
+	}
+
+	for (i = 0; i < ARRAY_SIZE(thp7312_sensor_info); i++) {
+		const struct thp7312_sensor_info *info =
+			&thp7312_sensor_info[i];
+
+		if (!strcmp(info->model, model)) {
+			thp7312->sensor_info = info;
+			break;
+		}
+	}
+
+	if (!thp7312->sensor_info) {
+		dev_err(dev, "Unsupported sensor model %s\n", model);
+		return -EINVAL;
+	}
+
+	ret = of_property_read_u32_array(node, "data-lanes",
+					 data_lanes_rx, ARRAY_SIZE(data_lanes_rx));
+	if (ret < 0) {
+		dev_err(dev, "Failed to read property data-lanes: %d\n", ret);
+		return ret;
+	}
+
+	for (i = 0; i < ARRAY_SIZE(sensor->data_lanes); i++)
+		sensor->data_lanes[i] = (u8)data_lanes_rx[i];
+
+	sensor->thp7312 = thp7312;
+	sensor->of_node = of_node_get(node);
+
+	return 0;
+}
+
+static int thp7312_parse_dt(struct thp7312_device *thp7312)
+{
+	struct device *dev = thp7312->dev;
+	struct fwnode_handle *endpoint;
+	struct device_node *sensors;
+	unsigned int num_sensors = 0;
+	struct device_node *node;
+	int ret;
+
+	endpoint = fwnode_graph_get_next_endpoint(dev_fwnode(dev), NULL);
+	if (!endpoint)
+		return dev_err_probe(dev, -EINVAL, "Endpoint node not found\n");
+
+	ret = v4l2_fwnode_endpoint_parse(endpoint, &thp7312->ep);
+	fwnode_handle_put(endpoint);
+	if (ret)
+		return dev_err_probe(dev, ret, "Could not parse endpoint\n");
+
+	if (thp7312->ep.bus_type != V4L2_MBUS_CSI2_DPHY)
+		return dev_err_probe(dev, -EINVAL, "Unsupported bus type %d\n",
+				     thp7312->ep.bus_type);
+
+	/*
+	 * The thine,boot-mode property is optional and default to
+	 * THP7312_BOOT_MODE_SPI_MASTER (1).
+	 */
+	thp7312->boot_mode = THP7312_BOOT_MODE_SPI_MASTER;
+	ret = of_property_read_u32(dev->of_node, "thine,boot-mode",
+				   &thp7312->boot_mode);
+	if (ret && ret != -EINVAL)
+		return dev_err_probe(dev, ret, "Property '%s' is invalid\n",
+				     "thine,boot-mode");
+
+	if (thp7312->boot_mode != THP7312_BOOT_MODE_2WIRE_SLAVE &&
+	    thp7312->boot_mode != THP7312_BOOT_MODE_SPI_MASTER)
+		return dev_err_probe(dev, -EINVAL, "Invalid '%s' value %u\n",
+				     "thine,boot-mode", thp7312->boot_mode);
+
+	/* Sensors */
+	sensors = of_get_child_by_name(dev->of_node, "sensors");
+	if (!sensors) {
+		dev_err(dev, "'sensors' child node not found\n");
+		return -EINVAL;
+	}
+
+	for_each_child_of_node(sensors, node) {
+		if (of_node_name_eq(node, "sensor")) {
+			if (!thp7312_sensor_parse_dt(thp7312, node))
+				num_sensors++;
+		}
+	}
+
+	of_node_put(sensors);
+
+	if (!num_sensors) {
+		dev_err(dev, "No sensor found\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int thp7312_probe(struct i2c_client *client)
+{
+	struct device *dev = &client->dev;
+	struct thp7312_device *thp7312;
+	int ret;
+
+	thp7312 = devm_kzalloc(dev, sizeof(*thp7312), GFP_KERNEL);
+	if (!thp7312)
+		return -ENOMEM;
+
+	thp7312->dev = dev;
+
+	thp7312->regmap = devm_cci_regmap_init_i2c(client, 16);
+	if (IS_ERR(thp7312->regmap))
+		return dev_err_probe(dev, PTR_ERR(thp7312->regmap),
+				     "Unable to initialize I2C\n");
+
+	ret = thp7312_parse_dt(thp7312);
+	if (ret < 0)
+		return ret;
+
+	ret = thp7312_get_regulators(thp7312);
+	if (ret)
+		return dev_err_probe(dev, ret, "Failed to get regulators\n");
+
+	thp7312->iclk = devm_clk_get(dev, NULL);
+	if (IS_ERR(thp7312->iclk))
+		return dev_err_probe(dev, PTR_ERR(thp7312->iclk),
+				     "Failed to get iclk\n");
+
+	thp7312->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
+	if (IS_ERR(thp7312->reset_gpio))
+		return dev_err_probe(dev, PTR_ERR(thp7312->reset_gpio),
+				     "Failed to get reset gpio\n");
+
+	/*
+	 * TODO: Should we confirm that we're in the right boot mode or can we
+	 * trust the dt? Or is it better to check just to protect the user from
+	 * mistakes?
+	 */
+	if (thp7312->boot_mode == THP7312_BOOT_MODE_2WIRE_SLAVE)
+		return thp7312_register_flash_mode(thp7312);
+
+	thp7312->current_mode = &thp7312_mode_info_data[0];
+	thp7312->current_rate = &thp7312->current_mode->rates[0];
+
+	ret = thp7312_init_sensors(thp7312);
+	if (ret < 0)
+		return ret;
+
+	v4l2_i2c_subdev_init(&thp7312->sd, client, &thp7312_subdev_ops);
+	thp7312->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE | V4L2_SUBDEV_FL_HAS_EVENTS;
+	thp7312->pad.flags = MEDIA_PAD_FL_SOURCE;
+	thp7312->sd.entity.function = MEDIA_ENT_F_CAM_SENSOR;
+
+	ret = media_entity_pads_init(&thp7312->sd.entity, 1, &thp7312->pad);
+	if (ret)
+		return ret;
+
+	ret = thp7312_power_on(thp7312);
+	if (ret)
+		goto entity_cleanup;
+
+	ret = thp7312_read_firmware_version(thp7312);
+	if (ret < 0) {
+		dev_err(dev, "Camera is not found\n");
+		goto power_off;
+	}
+
+	ret = thp7312_init_controls(thp7312);
+	if (ret)
+		goto power_off;
+
+	thp7312->sd.ctrl_handler = &thp7312->ctrl_handler;
+	thp7312->sd.state_lock = thp7312->ctrl_handler.lock;
+
+	ret = v4l2_subdev_init_finalize(&thp7312->sd);
+	if (ret < 0) {
+		dev_err(dev, "Subdev active state initialization failed\n");
+		goto free_ctrls;
+	}
+
+	ret = v4l2_async_register_subdev(&thp7312->sd);
+	if (ret < 0) {
+		dev_err(dev, "Subdev registration failed\n");
+		goto subdev_cleanup;
+	}
+
+	pm_runtime_set_active(dev);
+	pm_runtime_enable(dev);
+
+	dev_info(dev, "THP7312 firmware version %02u.%02u\n",
+		 thp7312->fw_major_version, thp7312->fw_minor_version);
+
+	return 0;
+
+subdev_cleanup:
+	v4l2_subdev_cleanup(&thp7312->sd);
+free_ctrls:
+	v4l2_ctrl_handler_free(&thp7312->ctrl_handler);
+power_off:
+	thp7312_power_off(thp7312);
+entity_cleanup:
+	media_entity_cleanup(&thp7312->sd.entity);
+	return ret;
+}
+
+static void thp7312_remove(struct i2c_client *client)
+{
+	struct v4l2_subdev *sd = i2c_get_clientdata(client);
+	struct thp7312_device *thp7312 = to_thp7312_dev(sd);
+
+	if (thp7312->boot_mode == THP7312_BOOT_MODE_2WIRE_SLAVE) {
+		firmware_upload_unregister(thp7312->fwl);
+		return;
+	}
+
+	pm_runtime_disable(&client->dev);
+	v4l2_subdev_cleanup(&thp7312->sd);
+	thp7312_remove_sensors(thp7312);
+	v4l2_async_unregister_subdev(&thp7312->sd);
+	v4l2_ctrl_handler_free(&thp7312->ctrl_handler);
+	media_entity_cleanup(&thp7312->sd.entity);
+	v4l2_device_unregister_subdev(sd);
+}
+
+static const struct of_device_id thp7312_dt_ids[] = {
+	{ .compatible = "thine,thp7312" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, thp7312_dt_ids);
+
+static struct i2c_driver thp7312_i2c_driver = {
+	.driver = {
+		.name  = "thp7312",
+		.pm = &thp7312_pm_ops,
+		.of_match_table	= thp7312_dt_ids,
+	},
+	.probe = thp7312_probe,
+	.remove = thp7312_remove,
+};
+
+module_i2c_driver(thp7312_i2c_driver);
+
+MODULE_DESCRIPTION("THP7312 MIPI Camera Subdev Driver");
+MODULE_LICENSE("GPL");
-- 
Regards,

Laurent Pinchart