media: i2c: Add GC05A2 image sensor driver

Add a V4L2 sub-device driver for Galaxycore GC05A2 image sensor.

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Zhi Mao <zhi.mao@mediatek.com>
[Sakari Ailus: Fold in MAINTAINERS change.]
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>

3 files changed, 1370 insertions, 0 deletions

diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
index faa74d4cd776..8aac41513b59 100644
--- a/drivers/media/i2c/Kconfig
+++ b/drivers/media/i2c/Kconfig
@@ -70,6 +70,16 @@ config VIDEO_GC0308
 	  To compile this driver as a module, choose M here: the
 	  module will be called gc0308.
 
+config VIDEO_GC05A2
+	tristate "GalaxyCore gc05a2 sensor support"
+	select V4L2_CCI_I2C
+	help
+	  This is a Video4Linux2 sensor driver for the GalaxyCore gc05a2
+	  camera.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called gc05a2.
+
 config VIDEO_GC08A3
 	tristate "GalaxyCore gc08a3 sensor support"
 	select V4L2_CCI_I2C
diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
index 8817b8e86989..fbb988bd067a 100644
--- a/drivers/media/i2c/Makefile
+++ b/drivers/media/i2c/Makefile
@@ -38,6 +38,7 @@ obj-$(CONFIG_VIDEO_DW9768) += dw9768.o
 obj-$(CONFIG_VIDEO_DW9807_VCM) += dw9807-vcm.o
 obj-$(CONFIG_VIDEO_ET8EK8) += et8ek8/
 obj-$(CONFIG_VIDEO_GC0308) += gc0308.o
+obj-$(CONFIG_VIDEO_GC05A2) += gc05a2.o
 obj-$(CONFIG_VIDEO_GC08A3) += gc08a3.o
 obj-$(CONFIG_VIDEO_GC2145) += gc2145.o
 obj-$(CONFIG_VIDEO_HI556) += hi556.o
diff --git a/drivers/media/i2c/gc05a2.c b/drivers/media/i2c/gc05a2.c
new file mode 100644
index 000000000000..dcba29ee725c
--- /dev/null
+++ b/drivers/media/i2c/gc05a2.c
@@ -0,0 +1,1359 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Driver for GalaxyCore gc05a2 image sensor
+ *
+ * Copyright 2024 MediaTek
+ *
+ * Zhi Mao <zhi.mao@mediatek.com>
+ */
+#include <linux/array_size.h>
+#include <linux/bits.h>
+#include <linux/clk.h>
+#include <linux/container_of.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/gpio/consumer.h>
+#include <linux/math64.h>
+#include <linux/mod_devicetable.h>
+#include <linux/pm_runtime.h>
+#include <linux/property.h>
+#include <linux/regulator/consumer.h>
+#include <linux/types.h>
+#include <linux/units.h>
+
+#include <media/v4l2-cci.h>
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-event.h>
+#include <media/v4l2-fwnode.h>
+#include <media/v4l2-subdev.h>
+
+#define GC05A2_REG_TEST_PATTERN_EN CCI_REG8(0x008c)
+#define GC05A2_REG_TEST_PATTERN_IDX CCI_REG8(0x008d)
+#define GC05A2_TEST_PATTERN_EN 0x01
+
+#define GC05A2_STREAMING_REG CCI_REG8(0x0100)
+
+#define GC05A2_FLIP_REG CCI_REG8(0x0101)
+#define GC05A2_FLIP_H_MASK BIT(0)
+#define GC05A2_FLIP_V_MASK BIT(1)
+
+#define GC05A2_EXP_REG CCI_REG16(0x0202)
+#define GC05A2_EXP_MARGIN 16
+#define GC05A2_EXP_MIN 4
+#define GC05A2_EXP_STEP 1
+
+#define GC05A2_AGAIN_REG CCI_REG16(0x0204)
+#define GC05A2_AGAIN_MIN 1024
+#define GC05A2_AGAIN_MAX (1024 * 16)
+#define GC05A2_AGAIN_STEP 1
+
+#define GC05A2_FRAME_LENGTH_REG CCI_REG16(0x0340)
+#define GC05A2_VTS_MAX 0xffff
+
+#define GC05A2_REG_CHIP_ID CCI_REG16(0x03f0)
+#define GC05A2_CHIP_ID 0x05a2
+
+#define GC05A2_NATIVE_WIDTH 2592
+#define GC05A2_NATIVE_HEIGHT 1944
+
+#define GC05A2_DEFAULT_CLK_FREQ (24 * HZ_PER_MHZ)
+#define GC05A2_MBUS_CODE MEDIA_BUS_FMT_SGRBG10_1X10
+#define GC05A2_DATA_LANES 2
+#define GC05A2_RGB_DEPTH 10
+#define GC05A2_SLEEP_US  (2 * USEC_PER_MSEC)
+
+static const char *const gc05a2_test_pattern_menu[] = {
+	"No Pattern",  "Fade_to_gray_Color Bar", "Color Bar",
+	"PN9",	       "Horizental_gradient",    "Checkboard Pattern",
+	"Slant",       "Resolution",	         "Solid Black",
+	"Solid White",
+};
+
+static const s64 gc05a2_link_freq_menu_items[] = {
+	(448 * HZ_PER_MHZ),
+	(224 * HZ_PER_MHZ),
+};
+
+static const char *const gc05a2_supply_name[] = {
+	"avdd",
+	"dvdd",
+	"dovdd",
+};
+
+struct gc05a2 {
+	struct device *dev;
+	struct v4l2_subdev sd;
+	struct media_pad pad;
+
+	struct clk *xclk;
+	struct regulator_bulk_data supplies[ARRAY_SIZE(gc05a2_supply_name)];
+	struct gpio_desc *reset_gpio;
+
+	struct v4l2_ctrl_handler ctrls;
+	struct v4l2_ctrl *pixel_rate;
+	struct v4l2_ctrl *link_freq;
+	struct v4l2_ctrl *exposure;
+	struct v4l2_ctrl *vblank;
+	struct v4l2_ctrl *hblank;
+	struct v4l2_ctrl *hflip;
+	struct v4l2_ctrl *vflip;
+
+	struct regmap *regmap;
+	unsigned long link_freq_bitmap;
+
+	/* True if the device has been identified */
+	bool identified;
+	const struct gc05a2_mode *cur_mode;
+};
+
+struct gc05a2_reg_list {
+	u32 num_of_regs;
+	const struct cci_reg_sequence *regs;
+};
+
+static const struct cci_reg_sequence mode_2592x1944[] = {
+	/* system */
+	{ CCI_REG8(0x0135), 0x01 },
+	{ CCI_REG8(0x0084), 0x21 },
+	{ CCI_REG8(0x0d05), 0xcc },
+	{ CCI_REG8(0x0218), 0x00 },
+	{ CCI_REG8(0x005e), 0x48 },
+	{ CCI_REG8(0x0d06), 0x01 },
+	{ CCI_REG8(0x0007), 0x16 },
+	{ CCI_REG8(0x0101), 0x00 },
+
+	/* analog */
+	{ CCI_REG8(0x0342), 0x07 },
+	{ CCI_REG8(0x0343), 0x28 },
+	{ CCI_REG8(0x0220), 0x07 },
+	{ CCI_REG8(0x0221), 0xd0 },
+	{ CCI_REG8(0x0202), 0x07 },
+	{ CCI_REG8(0x0203), 0x32 },
+	{ CCI_REG8(0x0340), 0x07 },
+	{ CCI_REG8(0x0341), 0xf0 },
+	{ CCI_REG8(0x0219), 0x00 },
+	{ CCI_REG8(0x0346), 0x00 },
+	{ CCI_REG8(0x0347), 0x04 },
+	{ CCI_REG8(0x0d14), 0x00 },
+	{ CCI_REG8(0x0d13), 0x05 },
+	{ CCI_REG8(0x0d16), 0x05 },
+	{ CCI_REG8(0x0d15), 0x1d },
+	{ CCI_REG8(0x00c0), 0x0a },
+	{ CCI_REG8(0x00c1), 0x30 },
+	{ CCI_REG8(0x034a), 0x07 },
+	{ CCI_REG8(0x034b), 0xa8 },
+	{ CCI_REG8(0x0e0a), 0x00 },
+	{ CCI_REG8(0x0e0b), 0x00 },
+	{ CCI_REG8(0x0e0e), 0x03 },
+	{ CCI_REG8(0x0e0f), 0x00 },
+	{ CCI_REG8(0x0e06), 0x0a },
+	{ CCI_REG8(0x0e23), 0x15 },
+	{ CCI_REG8(0x0e24), 0x15 },
+	{ CCI_REG8(0x0e2a), 0x10 },
+	{ CCI_REG8(0x0e2b), 0x10 },
+	{ CCI_REG8(0x0e17), 0x49 },
+	{ CCI_REG8(0x0e1b), 0x1c },
+	{ CCI_REG8(0x0e3a), 0x36 },
+	{ CCI_REG8(0x0d11), 0x84 },
+	{ CCI_REG8(0x0e52), 0x14 },
+	{ CCI_REG8(0x000b), 0x10 },
+	{ CCI_REG8(0x0008), 0x08 },
+	{ CCI_REG8(0x0223), 0x17 },
+	{ CCI_REG8(0x0d27), 0x39 },
+	{ CCI_REG8(0x0d22), 0x00 },
+	{ CCI_REG8(0x03f6), 0x0d },
+	{ CCI_REG8(0x0d04), 0x07 },
+	{ CCI_REG8(0x03f3), 0x72 },
+	{ CCI_REG8(0x03f4), 0xb8 },
+	{ CCI_REG8(0x03f5), 0xbc },
+	{ CCI_REG8(0x0d02), 0x73 },
+
+	/* auto load start */
+	{ CCI_REG8(0x00cb), 0x00 },
+
+	/* OUT 2592*1944 */
+	{ CCI_REG8(0x0350), 0x01 },
+	{ CCI_REG8(0x0353), 0x00 },
+	{ CCI_REG8(0x0354), 0x08 },
+	{ CCI_REG16(0x034c), 2592 }, /* Width */
+	{ CCI_REG8(0x021f), 0x14 },
+
+	/* MIPI */
+	{ CCI_REG8(0x0107), 0x05 },
+	{ CCI_REG8(0x0117), 0x01 },
+	{ CCI_REG8(0x0d81), 0x00 },
+	{ CCI_REG8(0x0d84), 0x0c },
+	{ CCI_REG8(0x0d85), 0xa8 },
+	{ CCI_REG8(0x0d86), 0x06 },
+	{ CCI_REG8(0x0d87), 0x55 },
+	{ CCI_REG8(0x0db3), 0x06 },
+	{ CCI_REG8(0x0db4), 0x08 },
+	{ CCI_REG8(0x0db5), 0x1e },
+	{ CCI_REG8(0x0db6), 0x02 },
+	{ CCI_REG8(0x0db8), 0x12 },
+	{ CCI_REG8(0x0db9), 0x0a },
+	{ CCI_REG8(0x0d93), 0x06 },
+	{ CCI_REG8(0x0d94), 0x09 },
+	{ CCI_REG8(0x0d95), 0x0d },
+	{ CCI_REG8(0x0d99), 0x0b },
+	{ CCI_REG8(0x0084), 0x01 },
+	{ CCI_REG8(0x0110), 0x01 },
+};
+
+static const struct cci_reg_sequence mode_1280x720[] = {
+	/* system */
+	{ CCI_REG8(0x0135), 0x05 },
+	{ CCI_REG8(0x0084), 0x21 },
+	{ CCI_REG8(0x0d05), 0xcc },
+	{ CCI_REG8(0x0218), 0x80 },
+	{ CCI_REG8(0x005e), 0x49 },
+	{ CCI_REG8(0x0d06), 0x81 },
+	{ CCI_REG8(0x0007), 0x16 },
+	{ CCI_REG8(0x0101), 0x00 },
+
+	/* analog */
+	{ CCI_REG8(0x0342), 0x07 },
+	{ CCI_REG8(0x0343), 0x10 },
+	{ CCI_REG8(0x0220), 0x07 },
+	{ CCI_REG8(0x0221), 0xd0 },
+	{ CCI_REG8(0x0202), 0x03 },
+	{ CCI_REG8(0x0203), 0x32 },
+	{ CCI_REG8(0x0340), 0x04 },
+	{ CCI_REG8(0x0341), 0x08 },
+	{ CCI_REG8(0x0219), 0x00 },
+	{ CCI_REG8(0x0346), 0x01 },
+	{ CCI_REG8(0x0347), 0x00 },
+	{ CCI_REG8(0x0d14), 0x00 },
+	{ CCI_REG8(0x0d13), 0x05 },
+	{ CCI_REG8(0x0d16), 0x05 },
+	{ CCI_REG8(0x0d15), 0x1d },
+	{ CCI_REG8(0x00c0), 0x0a },
+	{ CCI_REG8(0x00c1), 0x30 },
+	{ CCI_REG8(0x034a), 0x05 },
+	{ CCI_REG8(0x034b), 0xb0 },
+	{ CCI_REG8(0x0e0a), 0x00 },
+	{ CCI_REG8(0x0e0b), 0x00 },
+	{ CCI_REG8(0x0e0e), 0x03 },
+	{ CCI_REG8(0x0e0f), 0x00 },
+	{ CCI_REG8(0x0e06), 0x0a },
+	{ CCI_REG8(0x0e23), 0x15 },
+	{ CCI_REG8(0x0e24), 0x15 },
+	{ CCI_REG8(0x0e2a), 0x10 },
+	{ CCI_REG8(0x0e2b), 0x10 },
+	{ CCI_REG8(0x0e17), 0x49 },
+	{ CCI_REG8(0x0e1b), 0x1c },
+	{ CCI_REG8(0x0e3a), 0x36 },
+	{ CCI_REG8(0x0d11), 0x84 },
+	{ CCI_REG8(0x0e52), 0x14 },
+	{ CCI_REG8(0x000b), 0x0e },
+	{ CCI_REG8(0x0008), 0x03 },
+	{ CCI_REG8(0x0223), 0x16 },
+	{ CCI_REG8(0x0d27), 0x39 },
+	{ CCI_REG8(0x0d22), 0x00 },
+	{ CCI_REG8(0x03f6), 0x0d },
+	{ CCI_REG8(0x0d04), 0x07 },
+	{ CCI_REG8(0x03f3), 0x72 },
+	{ CCI_REG8(0x03f4), 0xb8 },
+	{ CCI_REG8(0x03f5), 0xbc },
+	{ CCI_REG8(0x0d02), 0x73 },
+
+	/* auto load start */
+	{ CCI_REG8(0x00cb), 0xfc },
+
+	/* OUT 1280x720 */
+	{ CCI_REG8(0x0350), 0x01 },
+	{ CCI_REG8(0x0353), 0x00 },
+	{ CCI_REG8(0x0354), 0x0c },
+	{ CCI_REG16(0x034c), 1280 }, /* Width */
+	{ CCI_REG8(0x021f), 0x14 },
+
+	/* MIPI */
+	{ CCI_REG8(0x0107), 0x05 },
+	{ CCI_REG8(0x0117), 0x01 },
+	{ CCI_REG8(0x0d81), 0x00 },
+	{ CCI_REG8(0x0d84), 0x06 },
+	{ CCI_REG8(0x0d85), 0x40 },
+	{ CCI_REG8(0x0d86), 0x03 },
+	{ CCI_REG8(0x0d87), 0x21 },
+	{ CCI_REG8(0x0db3), 0x03 },
+	{ CCI_REG8(0x0db4), 0x04 },
+	{ CCI_REG8(0x0db5), 0x0d },
+	{ CCI_REG8(0x0db6), 0x01 },
+	{ CCI_REG8(0x0db8), 0x04 },
+	{ CCI_REG8(0x0db9), 0x06 },
+	{ CCI_REG8(0x0d93), 0x03 },
+	{ CCI_REG8(0x0d94), 0x04 },
+	{ CCI_REG8(0x0d95), 0x05 },
+	{ CCI_REG8(0x0d99), 0x06 },
+	{ CCI_REG8(0x0084), 0x01 },
+	{ CCI_REG8(0x0110), 0x01 },
+};
+
+static const struct cci_reg_sequence mode_table_common[] = {
+	{ GC05A2_STREAMING_REG, 0x00 },
+	/* system */
+	{ CCI_REG8(0x0315), 0xd4 },
+	{ CCI_REG8(0x0d06), 0x01 },
+	{ CCI_REG8(0x0a70), 0x80 },
+	{ CCI_REG8(0x031a), 0x00 },
+	{ CCI_REG8(0x0314), 0x00 },
+	{ CCI_REG8(0x0130), 0x08 },
+	{ CCI_REG8(0x0132), 0x01 },
+	{ CCI_REG8(0x0136), 0x38 },
+	{ CCI_REG8(0x0137), 0x03 },
+	{ CCI_REG8(0x0134), 0x5b },
+	{ CCI_REG8(0x031c), 0xe0 },
+	{ CCI_REG8(0x0d82), 0x14 },
+	{ CCI_REG8(0x0dd1), 0x56 },
+	{ CCI_REG8(0x0af4), 0x01 },
+	{ CCI_REG8(0x0002), 0x10 },
+	{ CCI_REG8(0x00c3), 0x34 },
+	{ CCI_REG8(0x00c4), 0x00 },
+	{ CCI_REG8(0x00c5), 0x01 },
+	{ CCI_REG8(0x0af6), 0x00 },
+	{ CCI_REG8(0x0ba0), 0x17 },
+	{ CCI_REG8(0x0ba1), 0x00 },
+	{ CCI_REG8(0x0ba2), 0x00 },
+	{ CCI_REG8(0x0ba3), 0x00 },
+	{ CCI_REG8(0x0ba4), 0x03 },
+	{ CCI_REG8(0x0ba5), 0x00 },
+	{ CCI_REG8(0x0ba6), 0x00 },
+	{ CCI_REG8(0x0ba7), 0x00 },
+	{ CCI_REG8(0x0ba8), 0x40 },
+	{ CCI_REG8(0x0ba9), 0x00 },
+	{ CCI_REG8(0x0baa), 0x00 },
+	{ CCI_REG8(0x0bab), 0x00 },
+	{ CCI_REG8(0x0bac), 0x40 },
+	{ CCI_REG8(0x0bad), 0x00 },
+	{ CCI_REG8(0x0bae), 0x00 },
+	{ CCI_REG8(0x0baf), 0x00 },
+	{ CCI_REG8(0x0bb0), 0x02 },
+	{ CCI_REG8(0x0bb1), 0x00 },
+	{ CCI_REG8(0x0bb2), 0x00 },
+	{ CCI_REG8(0x0bb3), 0x00 },
+	{ CCI_REG8(0x0bb8), 0x02 },
+	{ CCI_REG8(0x0bb9), 0x00 },
+	{ CCI_REG8(0x0bba), 0x00 },
+	{ CCI_REG8(0x0bbb), 0x00 },
+	{ CCI_REG8(0x0a70), 0x80 },
+	{ CCI_REG8(0x0a71), 0x00 },
+	{ CCI_REG8(0x0a72), 0x00 },
+	{ CCI_REG8(0x0a66), 0x00 },
+	{ CCI_REG8(0x0a67), 0x80 },
+	{ CCI_REG8(0x0a4d), 0x4e },
+	{ CCI_REG8(0x0a50), 0x00 },
+	{ CCI_REG8(0x0a4f), 0x0c },
+	{ CCI_REG8(0x0a66), 0x00 },
+	{ CCI_REG8(0x00ca), 0x00 },
+	{ CCI_REG8(0x00cc), 0x00 },
+	{ CCI_REG8(0x00cd), 0x00 },
+	{ CCI_REG8(0x0aa1), 0x00 },
+	{ CCI_REG8(0x0aa2), 0xe0 },
+	{ CCI_REG8(0x0aa3), 0x00 },
+	{ CCI_REG8(0x0aa4), 0x40 },
+	{ CCI_REG8(0x0a90), 0x03 },
+	{ CCI_REG8(0x0a91), 0x0e },
+	{ CCI_REG8(0x0a94), 0x80 },
+	{ CCI_REG8(0x0af6), 0x20 },
+	{ CCI_REG8(0x0b00), 0x91 },
+	{ CCI_REG8(0x0b01), 0x17 },
+	{ CCI_REG8(0x0b02), 0x01 },
+	{ CCI_REG8(0x0b03), 0x00 },
+	{ CCI_REG8(0x0b04), 0x01 },
+	{ CCI_REG8(0x0b05), 0x17 },
+	{ CCI_REG8(0x0b06), 0x01 },
+	{ CCI_REG8(0x0b07), 0x00 },
+	{ CCI_REG8(0x0ae9), 0x01 },
+	{ CCI_REG8(0x0aea), 0x02 },
+	{ CCI_REG8(0x0ae8), 0x53 },
+	{ CCI_REG8(0x0ae8), 0x43 },
+	{ CCI_REG8(0x0af6), 0x30 },
+	{ CCI_REG8(0x0b00), 0x08 },
+	{ CCI_REG8(0x0b01), 0x0f },
+	{ CCI_REG8(0x0b02), 0x00 },
+	{ CCI_REG8(0x0b04), 0x1c },
+	{ CCI_REG8(0x0b05), 0x24 },
+	{ CCI_REG8(0x0b06), 0x00 },
+	{ CCI_REG8(0x0b08), 0x30 },
+	{ CCI_REG8(0x0b09), 0x40 },
+	{ CCI_REG8(0x0b0a), 0x00 },
+	{ CCI_REG8(0x0b0c), 0x0e },
+	{ CCI_REG8(0x0b0d), 0x2a },
+	{ CCI_REG8(0x0b0e), 0x00 },
+	{ CCI_REG8(0x0b10), 0x0e },
+	{ CCI_REG8(0x0b11), 0x2b },
+	{ CCI_REG8(0x0b12), 0x00 },
+	{ CCI_REG8(0x0b14), 0x0e },
+	{ CCI_REG8(0x0b15), 0x23 },
+	{ CCI_REG8(0x0b16), 0x00 },
+	{ CCI_REG8(0x0b18), 0x0e },
+	{ CCI_REG8(0x0b19), 0x24 },
+	{ CCI_REG8(0x0b1a), 0x00 },
+	{ CCI_REG8(0x0b1c), 0x0c },
+	{ CCI_REG8(0x0b1d), 0x0c },
+	{ CCI_REG8(0x0b1e), 0x00 },
+	{ CCI_REG8(0x0b20), 0x03 },
+	{ CCI_REG8(0x0b21), 0x03 },
+	{ CCI_REG8(0x0b22), 0x00 },
+	{ CCI_REG8(0x0b24), 0x0e },
+	{ CCI_REG8(0x0b25), 0x0e },
+	{ CCI_REG8(0x0b26), 0x00 },
+	{ CCI_REG8(0x0b28), 0x03 },
+	{ CCI_REG8(0x0b29), 0x03 },
+	{ CCI_REG8(0x0b2a), 0x00 },
+	{ CCI_REG8(0x0b2c), 0x12 },
+	{ CCI_REG8(0x0b2d), 0x12 },
+	{ CCI_REG8(0x0b2e), 0x00 },
+	{ CCI_REG8(0x0b30), 0x08 },
+	{ CCI_REG8(0x0b31), 0x08 },
+	{ CCI_REG8(0x0b32), 0x00 },
+	{ CCI_REG8(0x0b34), 0x14 },
+	{ CCI_REG8(0x0b35), 0x14 },
+	{ CCI_REG8(0x0b36), 0x00 },
+	{ CCI_REG8(0x0b38), 0x10 },
+	{ CCI_REG8(0x0b39), 0x10 },
+	{ CCI_REG8(0x0b3a), 0x00 },
+	{ CCI_REG8(0x0b3c), 0x16 },
+	{ CCI_REG8(0x0b3d), 0x16 },
+	{ CCI_REG8(0x0b3e), 0x00 },
+	{ CCI_REG8(0x0b40), 0x10 },
+	{ CCI_REG8(0x0b41), 0x10 },
+	{ CCI_REG8(0x0b42), 0x00 },
+	{ CCI_REG8(0x0b44), 0x19 },
+	{ CCI_REG8(0x0b45), 0x19 },
+	{ CCI_REG8(0x0b46), 0x00 },
+	{ CCI_REG8(0x0b48), 0x16 },
+	{ CCI_REG8(0x0b49), 0x16 },
+	{ CCI_REG8(0x0b4a), 0x00 },
+	{ CCI_REG8(0x0b4c), 0x19 },
+	{ CCI_REG8(0x0b4d), 0x19 },
+	{ CCI_REG8(0x0b4e), 0x00 },
+	{ CCI_REG8(0x0b50), 0x16 },
+	{ CCI_REG8(0x0b51), 0x16 },
+	{ CCI_REG8(0x0b52), 0x00 },
+	{ CCI_REG8(0x0b80), 0x01 },
+	{ CCI_REG8(0x0b81), 0x00 },
+	{ CCI_REG8(0x0b82), 0x00 },
+	{ CCI_REG8(0x0b84), 0x00 },
+	{ CCI_REG8(0x0b85), 0x00 },
+	{ CCI_REG8(0x0b86), 0x00 },
+	{ CCI_REG8(0x0b88), 0x01 },
+	{ CCI_REG8(0x0b89), 0x6a },
+	{ CCI_REG8(0x0b8a), 0x00 },
+	{ CCI_REG8(0x0b8c), 0x00 },
+	{ CCI_REG8(0x0b8d), 0x01 },
+	{ CCI_REG8(0x0b8e), 0x00 },
+	{ CCI_REG8(0x0b90), 0x01 },
+	{ CCI_REG8(0x0b91), 0xf6 },
+	{ CCI_REG8(0x0b92), 0x00 },
+	{ CCI_REG8(0x0b94), 0x00 },
+	{ CCI_REG8(0x0b95), 0x02 },
+	{ CCI_REG8(0x0b96), 0x00 },
+	{ CCI_REG8(0x0b98), 0x02 },
+	{ CCI_REG8(0x0b99), 0xc4 },
+	{ CCI_REG8(0x0b9a), 0x00 },
+	{ CCI_REG8(0x0b9c), 0x00 },
+	{ CCI_REG8(0x0b9d), 0x03 },
+	{ CCI_REG8(0x0b9e), 0x00 },
+	{ CCI_REG8(0x0ba0), 0x03 },
+	{ CCI_REG8(0x0ba1), 0xd8 },
+	{ CCI_REG8(0x0ba2), 0x00 },
+	{ CCI_REG8(0x0ba4), 0x00 },
+	{ CCI_REG8(0x0ba5), 0x04 },
+	{ CCI_REG8(0x0ba6), 0x00 },
+	{ CCI_REG8(0x0ba8), 0x05 },
+	{ CCI_REG8(0x0ba9), 0x4d },
+	{ CCI_REG8(0x0baa), 0x00 },
+	{ CCI_REG8(0x0bac), 0x00 },
+	{ CCI_REG8(0x0bad), 0x05 },
+	{ CCI_REG8(0x0bae), 0x00 },
+	{ CCI_REG8(0x0bb0), 0x07 },
+	{ CCI_REG8(0x0bb1), 0x3e },
+	{ CCI_REG8(0x0bb2), 0x00 },
+	{ CCI_REG8(0x0bb4), 0x00 },
+	{ CCI_REG8(0x0bb5), 0x06 },
+	{ CCI_REG8(0x0bb6), 0x00 },
+	{ CCI_REG8(0x0bb8), 0x0a },
+	{ CCI_REG8(0x0bb9), 0x1a },
+	{ CCI_REG8(0x0bba), 0x00 },
+	{ CCI_REG8(0x0bbc), 0x09 },
+	{ CCI_REG8(0x0bbd), 0x36 },
+	{ CCI_REG8(0x0bbe), 0x00 },
+	{ CCI_REG8(0x0bc0), 0x0e },
+	{ CCI_REG8(0x0bc1), 0x66 },
+	{ CCI_REG8(0x0bc2), 0x00 },
+	{ CCI_REG8(0x0bc4), 0x10 },
+	{ CCI_REG8(0x0bc5), 0x06 },
+	{ CCI_REG8(0x0bc6), 0x00 },
+	{ CCI_REG8(0x02c1), 0xe0 },
+	{ CCI_REG8(0x0207), 0x04 },
+	{ CCI_REG8(0x02c2), 0x10 },
+	{ CCI_REG8(0x02c3), 0x74 },
+	{ CCI_REG8(0x02c5), 0x09 },
+	{ CCI_REG8(0x02c1), 0xe0 },
+	{ CCI_REG8(0x0207), 0x04 },
+	{ CCI_REG8(0x02c2), 0x10 },
+	{ CCI_REG8(0x02c5), 0x09 },
+	{ CCI_REG8(0x02c1), 0xe0 },
+	{ CCI_REG8(0x0207), 0x04 },
+	{ CCI_REG8(0x02c2), 0x10 },
+	{ CCI_REG8(0x02c5), 0x09 },
+	{ CCI_REG8(0x0aa1), 0x15 },
+	{ CCI_REG8(0x0aa2), 0x50 },
+	{ CCI_REG8(0x0aa3), 0x00 },
+	{ CCI_REG8(0x0aa4), 0x09 },
+	{ CCI_REG8(0x0a90), 0x25 },
+	{ CCI_REG8(0x0a91), 0x0e },
+	{ CCI_REG8(0x0a94), 0x80 },
+
+	/* ISP */
+	{ CCI_REG8(0x0050), 0x00 },
+	{ CCI_REG8(0x0089), 0x83 },
+	{ CCI_REG8(0x005a), 0x40 },
+	{ CCI_REG8(0x00c3), 0x35 },
+	{ CCI_REG8(0x00c4), 0x80 },
+	{ CCI_REG8(0x0080), 0x10 },
+	{ CCI_REG8(0x0040), 0x12 },
+	{ CCI_REG8(0x0053), 0x0a },
+	{ CCI_REG8(0x0054), 0x44 },
+	{ CCI_REG8(0x0055), 0x32 },
+	{ CCI_REG8(0x0058), 0x89 },
+	{ CCI_REG8(0x004a), 0x03 },
+	{ CCI_REG8(0x0048), 0xf0 },
+	{ CCI_REG8(0x0049), 0x0f },
+	{ CCI_REG8(0x0041), 0x20 },
+	{ CCI_REG8(0x0043), 0x0a },
+	{ CCI_REG8(0x009d), 0x08 },
+	{ CCI_REG8(0x0236), 0x40 },
+	{ CCI_REG8(0x0204), 0x04 },
+	{ CCI_REG8(0x0205), 0x00 },
+	{ CCI_REG8(0x02b3), 0x00 },
+	{ CCI_REG8(0x02b4), 0x00 },
+	{ CCI_REG8(0x009e), 0x01 },
+	{ CCI_REG8(0x009f), 0x94 },
+
+	/* auto load REG */
+	{ CCI_REG8(0x0aa1), 0x10 },
+	{ CCI_REG8(0x0aa2), 0xf8 },
+	{ CCI_REG8(0x0aa3), 0x00 },
+	{ CCI_REG8(0x0aa4), 0x1f },
+	{ CCI_REG8(0x0a90), 0x11 },
+	{ CCI_REG8(0x0a91), 0x0e },
+	{ CCI_REG8(0x0a94), 0x80 },
+	{ CCI_REG8(0x03fe), 0x00 },
+	{ CCI_REG8(0x0a90), 0x00 },
+	{ CCI_REG8(0x0a70), 0x00 },
+	{ CCI_REG8(0x0a67), 0x00 },
+	{ CCI_REG8(0x0af4), 0x29 },
+
+	/* DPHY */
+	{ CCI_REG8(0x0d80), 0x07 },
+	{ CCI_REG8(0x0dd3), 0x18 },
+
+	/* CISCTL_Reset */
+	{ CCI_REG8(0x031c), 0x80 },
+	{ CCI_REG8(0x03fe), 0x30 },
+	{ CCI_REG8(0x0d17), 0x06 },
+	{ CCI_REG8(0x03fe), 0x00 },
+	{ CCI_REG8(0x0d17), 0x00 },
+	{ CCI_REG8(0x031c), 0x93 },
+	{ CCI_REG8(0x03fe), 0x00 },
+	{ CCI_REG8(0x031c), 0x80 },
+	{ CCI_REG8(0x03fe), 0x30 },
+	{ CCI_REG8(0x0d17), 0x06 },
+	{ CCI_REG8(0x03fe), 0x00 },
+	{ CCI_REG8(0x0d17), 0x00 },
+	{ CCI_REG8(0x031c), 0x93 },
+};
+
+struct gc05a2_mode {
+	u32 width;
+	u32 height;
+	const struct gc05a2_reg_list reg_list;
+
+	u32 hts; /* Horizontal timining size */
+	u32 vts_def; /* Default vertical timining size */
+	u32 vts_min; /* Min vertical timining size */
+};
+
+/* Declare modes in order, from biggest to smallest height. */
+static const struct gc05a2_mode gc05a2_modes[] = {
+	{
+		/* 2592*1944@30fps */
+		.width = GC05A2_NATIVE_WIDTH,
+		.height = GC05A2_NATIVE_HEIGHT,
+		.reg_list = {
+			.num_of_regs = ARRAY_SIZE(mode_2592x1944),
+			.regs = mode_2592x1944,
+		},
+		.hts = 3664,
+		.vts_def = 2032,
+		.vts_min = 2032,
+	},
+	{
+		/* 1280*720@60fps */
+		.width = 1280,
+		.height = 720,
+		.reg_list = {
+			.num_of_regs = ARRAY_SIZE(mode_1280x720),
+			.regs = mode_1280x720,
+		},
+		.hts = 3616,
+		.vts_def = 1032,
+		.vts_min = 1032,
+	},
+};
+
+static inline struct gc05a2 *to_gc05a2(struct v4l2_subdev *sd)
+{
+	return container_of(sd, struct gc05a2, sd);
+}
+
+static int gc05a2_power_on(struct device *dev)
+{
+	struct v4l2_subdev *sd = dev_get_drvdata(dev);
+	struct gc05a2 *gc05a2 = to_gc05a2(sd);
+	int ret;
+
+	ret = regulator_bulk_enable(ARRAY_SIZE(gc05a2_supply_name),
+				    gc05a2->supplies);
+	if (ret < 0) {
+		dev_err(gc05a2->dev, "failed to enable regulators: %d\n", ret);
+		return ret;
+	}
+
+	ret = clk_prepare_enable(gc05a2->xclk);
+	if (ret < 0) {
+		regulator_bulk_disable(ARRAY_SIZE(gc05a2_supply_name),
+				       gc05a2->supplies);
+		dev_err(gc05a2->dev, "clk prepare enable failed\n");
+		return ret;
+	}
+
+	fsleep(GC05A2_SLEEP_US);
+
+	gpiod_set_value_cansleep(gc05a2->reset_gpio, 0);
+	fsleep(GC05A2_SLEEP_US);
+
+	return 0;
+}
+
+static int gc05a2_power_off(struct device *dev)
+{
+	struct v4l2_subdev *sd = dev_get_drvdata(dev);
+	struct gc05a2 *gc05a2 = to_gc05a2(sd);
+
+	clk_disable_unprepare(gc05a2->xclk);
+	gpiod_set_value_cansleep(gc05a2->reset_gpio, 1);
+	regulator_bulk_disable(ARRAY_SIZE(gc05a2_supply_name),
+			       gc05a2->supplies);
+
+	return 0;
+}
+
+static int gc05a2_enum_mbus_code(struct v4l2_subdev *sd,
+				 struct v4l2_subdev_state *sd_state,
+				 struct v4l2_subdev_mbus_code_enum *code)
+{
+	if (code->index > 0)
+		return -EINVAL;
+
+	code->code = GC05A2_MBUS_CODE;
+
+	return 0;
+}
+
+static int gc05a2_enum_frame_size(struct v4l2_subdev *subdev,
+				  struct v4l2_subdev_state *sd_state,
+				  struct v4l2_subdev_frame_size_enum *fse)
+{
+	if (fse->code != GC05A2_MBUS_CODE)
+		return -EINVAL;
+
+	if (fse->index >= ARRAY_SIZE(gc05a2_modes))
+		return -EINVAL;
+
+	fse->min_width = gc05a2_modes[fse->index].width;
+	fse->max_width = gc05a2_modes[fse->index].width;
+	fse->min_height = gc05a2_modes[fse->index].height;
+	fse->max_height = gc05a2_modes[fse->index].height;
+
+	return 0;
+}
+
+static int gc05a2_update_cur_mode_controls(struct gc05a2 *gc05a2,
+					   const struct gc05a2_mode *mode)
+{
+	s64 exposure_max, h_blank;
+	int ret;
+
+	ret = __v4l2_ctrl_modify_range(gc05a2->vblank,
+				       mode->vts_min - mode->height,
+				       GC05A2_VTS_MAX - mode->height, 1,
+				       mode->vts_def - mode->height);
+	if (ret) {
+		dev_err(gc05a2->dev, "VB ctrl range update failed\n");
+		return ret;
+	}
+
+	h_blank = mode->hts - mode->width;
+	ret = __v4l2_ctrl_modify_range(gc05a2->hblank, h_blank, h_blank, 1,
+				       h_blank);
+	if (ret) {
+		dev_err(gc05a2->dev, "HB ctrl range update failed\n");
+		return ret;
+	}
+
+	exposure_max = mode->vts_def - GC05A2_EXP_MARGIN;
+	ret = __v4l2_ctrl_modify_range(gc05a2->exposure, GC05A2_EXP_MIN,
+				       exposure_max, GC05A2_EXP_STEP,
+				       exposure_max);
+	if (ret) {
+		dev_err(gc05a2->dev, "exposure ctrl range update failed\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static void gc05a2_update_pad_format(struct gc05a2 *gc08a3,
+				     const struct gc05a2_mode *mode,
+				     struct v4l2_mbus_framefmt *fmt)
+{
+	fmt->width = mode->width;
+	fmt->height = mode->height;
+	fmt->code = GC05A2_MBUS_CODE;
+	fmt->field = V4L2_FIELD_NONE;
+	fmt->colorspace = V4L2_COLORSPACE_RAW;
+	fmt->ycbcr_enc = V4L2_MAP_YCBCR_ENC_DEFAULT(fmt->colorspace);
+	fmt->quantization = V4L2_QUANTIZATION_FULL_RANGE;
+	fmt->xfer_func = V4L2_XFER_FUNC_NONE;
+}
+
+static int gc05a2_set_format(struct v4l2_subdev *sd,
+			     struct v4l2_subdev_state *state,
+			     struct v4l2_subdev_format *fmt)
+{
+	struct gc05a2 *gc05a2 = to_gc05a2(sd);
+	struct v4l2_mbus_framefmt *mbus_fmt;
+	struct v4l2_rect *crop;
+	const struct gc05a2_mode *mode;
+
+	mode = v4l2_find_nearest_size(gc05a2_modes, ARRAY_SIZE(gc05a2_modes),
+				      width, height, fmt->format.width,
+				      fmt->format.height);
+
+	/* update crop info to subdev state */
+	crop = v4l2_subdev_state_get_crop(state, 0);
+	crop->width = mode->width;
+	crop->height = mode->height;
+
+	/* update fmt info to subdev state */
+	gc05a2_update_pad_format(gc05a2, mode, &fmt->format);
+	mbus_fmt = v4l2_subdev_state_get_format(state, 0);
+	*mbus_fmt = fmt->format;
+
+	if (fmt->which == V4L2_SUBDEV_FORMAT_TRY)
+		return 0;
+	gc05a2->cur_mode = mode;
+	gc05a2_update_cur_mode_controls(gc05a2, mode);
+
+	return 0;
+}
+
+static int gc05a2_get_selection(struct v4l2_subdev *sd,
+				struct v4l2_subdev_state *state,
+				struct v4l2_subdev_selection *sel)
+{
+	switch (sel->target) {
+	case V4L2_SEL_TGT_CROP_DEFAULT:
+	case V4L2_SEL_TGT_CROP:
+		sel->r = *v4l2_subdev_state_get_crop(state, 0);
+		break;
+	case V4L2_SEL_TGT_CROP_BOUNDS:
+		sel->r.top = 0;
+		sel->r.left = 0;
+		sel->r.width = GC05A2_NATIVE_WIDTH;
+		sel->r.height = GC05A2_NATIVE_HEIGHT;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int gc05a2_init_state(struct v4l2_subdev *sd,
+			     struct v4l2_subdev_state *state)
+{
+	struct v4l2_subdev_format fmt = {
+		.which = V4L2_SUBDEV_FORMAT_TRY,
+		.pad = 0,
+		.format = {
+			.code = GC05A2_MBUS_CODE,
+			.width = gc05a2_modes[0].width,
+			.height = gc05a2_modes[0].height,
+		},
+	};
+
+	gc05a2_set_format(sd, state, &fmt);
+
+	return 0;
+}
+
+static int gc05a2_set_ctrl_hflip(struct gc05a2 *gc05a2, u32 ctrl_val)
+{
+	int ret;
+	u64 val;
+
+	ret = cci_read(gc05a2->regmap, GC05A2_FLIP_REG, &val, NULL);
+	if (ret) {
+		dev_err(gc05a2->dev, "read hflip register failed: %d\n", ret);
+		return ret;
+	}
+
+	return cci_update_bits(gc05a2->regmap, GC05A2_FLIP_REG,
+			       GC05A2_FLIP_H_MASK,
+			       ctrl_val ? GC05A2_FLIP_H_MASK : 0, NULL);
+}
+
+static int gc05a2_set_ctrl_vflip(struct gc05a2 *gc05a2, u32 ctrl_val)
+{
+	int ret;
+	u64 val;
+
+	ret = cci_read(gc05a2->regmap, GC05A2_FLIP_REG, &val, NULL);
+	if (ret) {
+		dev_err(gc05a2->dev, "read vflip register failed: %d\n", ret);
+		return ret;
+	}
+
+	return cci_update_bits(gc05a2->regmap, GC05A2_FLIP_REG,
+			       GC05A2_FLIP_V_MASK,
+			       ctrl_val ? GC05A2_FLIP_V_MASK : 0, NULL);
+}
+
+static int gc05a2_test_pattern(struct gc05a2 *gc05a2, u32 pattern_menu)
+{
+	u32 pattern;
+	int ret;
+
+	if (pattern_menu) {
+		switch (pattern_menu) {
+		case 1:
+		case 2:
+		case 3:
+		case 4:
+		case 5:
+		case 6:
+		case 7:
+			pattern = pattern_menu << 4;
+			break;
+
+		case 8:
+			pattern = 0;
+			break;
+
+		case 9:
+			pattern = 4;
+			break;
+
+		default:
+			/* Set pattern to 0, it's a safe default. */
+			pattern = 0;
+			break;
+		}
+
+		ret = cci_write(gc05a2->regmap, GC05A2_REG_TEST_PATTERN_IDX,
+				pattern, NULL);
+		if (ret)
+			return ret;
+
+		return cci_write(gc05a2->regmap, GC05A2_REG_TEST_PATTERN_EN,
+				 GC05A2_TEST_PATTERN_EN, NULL);
+	} else {
+		return cci_write(gc05a2->regmap, GC05A2_REG_TEST_PATTERN_EN,
+				 0x00, NULL);
+	}
+}
+
+static int gc05a2_set_ctrl(struct v4l2_ctrl *ctrl)
+{
+	struct gc05a2 *gc05a2 =
+		container_of(ctrl->handler, struct gc05a2, ctrls);
+	int ret = 0;
+	s64 exposure_max;
+	struct v4l2_subdev_state *state;
+	const struct v4l2_mbus_framefmt *format;
+
+	state = v4l2_subdev_get_locked_active_state(&gc05a2->sd);
+	format = v4l2_subdev_state_get_format(state, 0);
+
+	if (ctrl->id == V4L2_CID_VBLANK) {
+		/* Update max exposure while meeting expected vblanking */
+		exposure_max = format->height + ctrl->val - GC05A2_EXP_MARGIN;
+		__v4l2_ctrl_modify_range(gc05a2->exposure,
+					 gc05a2->exposure->minimum,
+					 exposure_max, gc05a2->exposure->step,
+					 exposure_max);
+	}
+
+	/*
+	 * Applying V4L2 control value only happens
+	 * when power is on for streaming.
+	 */
+	if (!pm_runtime_get_if_active(gc05a2->dev))
+		return 0;
+
+	switch (ctrl->id) {
+	case V4L2_CID_EXPOSURE:
+		ret = cci_write(gc05a2->regmap, GC05A2_EXP_REG,
+				ctrl->val, NULL);
+		break;
+
+	case V4L2_CID_ANALOGUE_GAIN:
+		ret = cci_write(gc05a2->regmap, GC05A2_AGAIN_REG,
+				ctrl->val, NULL);
+		break;
+
+	case V4L2_CID_VBLANK:
+		ret = cci_write(gc05a2->regmap, GC05A2_FRAME_LENGTH_REG,
+				gc05a2->cur_mode->height + ctrl->val, NULL);
+		break;
+
+	case V4L2_CID_HFLIP:
+		ret = gc05a2_set_ctrl_hflip(gc05a2, ctrl->val);
+		break;
+
+	case V4L2_CID_VFLIP:
+		ret = gc05a2_set_ctrl_vflip(gc05a2, ctrl->val);
+		break;
+
+	case V4L2_CID_TEST_PATTERN:
+		ret = gc05a2_test_pattern(gc05a2, ctrl->val);
+		break;
+
+	default:
+		break;
+	}
+
+	pm_runtime_put(gc05a2->dev);
+
+	return ret;
+}
+
+static const struct v4l2_ctrl_ops gc05a2_ctrl_ops = {
+	.s_ctrl = gc05a2_set_ctrl,
+};
+
+static int gc05a2_identify_module(struct gc05a2 *gc05a2)
+{
+	u64 val;
+	int ret;
+
+	if (gc05a2->identified)
+		return 0;
+
+	ret = cci_read(gc05a2->regmap, GC05A2_REG_CHIP_ID, &val, NULL);
+	if (ret)
+		return ret;
+
+	if (val != GC05A2_CHIP_ID) {
+		dev_err(gc05a2->dev, "chip id mismatch: 0x%x!=0x%llx",
+			GC05A2_CHIP_ID, val);
+		return -ENXIO;
+	}
+
+	gc05a2->identified = true;
+
+	return 0;
+}
+
+static int gc05a2_start_streaming(struct gc05a2 *gc05a2)
+{
+	const struct gc05a2_mode *mode;
+	const struct gc05a2_reg_list *reg_list;
+	int ret;
+
+	ret = pm_runtime_resume_and_get(gc05a2->dev);
+	if (ret < 0)
+		return ret;
+
+	ret = gc05a2_identify_module(gc05a2);
+	if (ret)
+		goto err_rpm_put;
+
+	ret = cci_multi_reg_write(gc05a2->regmap,
+				  mode_table_common,
+				  ARRAY_SIZE(mode_table_common), NULL);
+	if (ret)
+		goto err_rpm_put;
+
+	mode = gc05a2->cur_mode;
+	reg_list = &mode->reg_list;
+
+	ret = cci_multi_reg_write(gc05a2->regmap,
+				  reg_list->regs, reg_list->num_of_regs, NULL);
+	if (ret < 0)
+		goto err_rpm_put;
+
+	ret = __v4l2_ctrl_handler_setup(&gc05a2->ctrls);
+	if (ret < 0) {
+		dev_err(gc05a2->dev, "could not sync v4l2 controls\n");
+		goto err_rpm_put;
+	}
+
+	ret = cci_write(gc05a2->regmap, GC05A2_STREAMING_REG, 1, NULL);
+	if (ret < 0) {
+		dev_err(gc05a2->dev, "write STREAMING_REG failed: %d\n", ret);
+		goto err_rpm_put;
+	}
+
+	return 0;
+
+err_rpm_put:
+	pm_runtime_put(gc05a2->dev);
+	return ret;
+}
+
+static int gc05a2_stop_streaming(struct gc05a2 *gc05a2)
+{
+	int ret;
+
+	ret = cci_write(gc05a2->regmap, GC05A2_STREAMING_REG, 0, NULL);
+	if (ret < 0)
+		dev_err(gc05a2->dev, "could not sent stop streaming %d\n", ret);
+
+	pm_runtime_put(gc05a2->dev);
+	return ret;
+}
+
+static int gc05a2_s_stream(struct v4l2_subdev *subdev, int enable)
+{
+	struct gc05a2 *gc05a2 = to_gc05a2(subdev);
+	struct v4l2_subdev_state *state;
+	int ret;
+
+	state = v4l2_subdev_lock_and_get_active_state(subdev);
+
+	if (enable)
+		ret = gc05a2_start_streaming(gc05a2);
+	else
+		ret = gc05a2_stop_streaming(gc05a2);
+
+	v4l2_subdev_unlock_state(state);
+
+	return ret;
+}
+
+static const struct v4l2_subdev_video_ops gc05a2_video_ops = {
+	.s_stream = gc05a2_s_stream,
+};
+
+static const struct v4l2_subdev_pad_ops gc05a2_subdev_pad_ops = {
+	.enum_mbus_code = gc05a2_enum_mbus_code,
+	.enum_frame_size = gc05a2_enum_frame_size,
+	.get_fmt = v4l2_subdev_get_fmt,
+	.set_fmt = gc05a2_set_format,
+	.get_selection = gc05a2_get_selection,
+};
+
+static const struct v4l2_subdev_core_ops gc05a2_core_ops = {
+	.subscribe_event = v4l2_ctrl_subdev_subscribe_event,
+	.unsubscribe_event = v4l2_event_subdev_unsubscribe,
+};
+
+static const struct v4l2_subdev_ops gc05a2_subdev_ops = {
+	.core = &gc05a2_core_ops,
+	.video = &gc05a2_video_ops,
+	.pad = &gc05a2_subdev_pad_ops,
+};
+
+static const struct v4l2_subdev_internal_ops gc05a2_internal_ops = {
+	.init_state = gc05a2_init_state,
+};
+
+static int gc05a2_get_regulators(struct device *dev, struct gc05a2 *gc05a2)
+{
+	unsigned int i;
+
+	for (i = 0; i < ARRAY_SIZE(gc05a2_supply_name); i++)
+		gc05a2->supplies[i].supply = gc05a2_supply_name[i];
+
+	return devm_regulator_bulk_get(dev, ARRAY_SIZE(gc05a2_supply_name),
+				       gc05a2->supplies);
+}
+
+static int gc05a2_parse_fwnode(struct gc05a2 *gc05a2)
+{
+	struct fwnode_handle *endpoint;
+	struct v4l2_fwnode_endpoint bus_cfg = {
+		.bus_type = V4L2_MBUS_CSI2_DPHY,
+	};
+	int ret;
+	struct device *dev = gc05a2->dev;
+
+	endpoint =
+		fwnode_graph_get_endpoint_by_id(dev_fwnode(dev), 0, 0,
+						FWNODE_GRAPH_ENDPOINT_NEXT);
+	if (!endpoint)
+		return dev_err_probe(dev, -EINVAL, "Missing endpoint node\n");
+
+	ret = v4l2_fwnode_endpoint_alloc_parse(endpoint, &bus_cfg);
+	if (ret) {
+		dev_err_probe(dev, ret, "parsing endpoint node failed\n");
+		goto done;
+	}
+
+	ret = v4l2_link_freq_to_bitmap(dev, bus_cfg.link_frequencies,
+				       bus_cfg.nr_of_link_frequencies,
+				       gc05a2_link_freq_menu_items,
+				       ARRAY_SIZE(gc05a2_link_freq_menu_items),
+				       &gc05a2->link_freq_bitmap);
+	if (ret)
+		goto done;
+
+done:
+	v4l2_fwnode_endpoint_free(&bus_cfg);
+	fwnode_handle_put(endpoint);
+	return ret;
+}
+
+static u64 gc05a2_to_pixel_rate(u32 f_index)
+{
+	u64 pixel_rate =
+		gc05a2_link_freq_menu_items[f_index] * 2 * GC05A2_DATA_LANES;
+
+	return div_u64(pixel_rate, GC05A2_RGB_DEPTH);
+}
+
+static int gc05a2_init_controls(struct gc05a2 *gc05a2)
+{
+	struct i2c_client *client = v4l2_get_subdevdata(&gc05a2->sd);
+	const struct gc05a2_mode *mode = &gc05a2_modes[0];
+	const struct v4l2_ctrl_ops *ops = &gc05a2_ctrl_ops;
+	struct v4l2_fwnode_device_properties props;
+	struct v4l2_ctrl_handler *ctrl_hdlr;
+	s64 exposure_max, h_blank;
+	int ret;
+
+	ctrl_hdlr = &gc05a2->ctrls;
+	ret = v4l2_ctrl_handler_init(ctrl_hdlr, 9);
+	if (ret)
+		return ret;
+
+	gc05a2->hflip = v4l2_ctrl_new_std(ctrl_hdlr, &gc05a2_ctrl_ops,
+					  V4L2_CID_HFLIP, 0, 1, 1, 0);
+	gc05a2->vflip = v4l2_ctrl_new_std(ctrl_hdlr, &gc05a2_ctrl_ops,
+					  V4L2_CID_VFLIP, 0, 1, 1, 0);
+	v4l2_ctrl_cluster(2, &gc05a2->hflip);
+
+	gc05a2->link_freq =
+	v4l2_ctrl_new_int_menu(ctrl_hdlr,
+			       &gc05a2_ctrl_ops,
+			       V4L2_CID_LINK_FREQ,
+			       ARRAY_SIZE(gc05a2_link_freq_menu_items) - 1,
+			       0,
+			       gc05a2_link_freq_menu_items);
+	if (gc05a2->link_freq)
+		gc05a2->link_freq->flags |= V4L2_CTRL_FLAG_READ_ONLY;
+
+	gc05a2->pixel_rate =
+		v4l2_ctrl_new_std(ctrl_hdlr,
+				  &gc05a2_ctrl_ops,
+				  V4L2_CID_PIXEL_RATE, 0,
+				  gc05a2_to_pixel_rate(0),
+				  1,
+				  gc05a2_to_pixel_rate(0));
+
+	gc05a2->vblank =
+		v4l2_ctrl_new_std(ctrl_hdlr,
+				  &gc05a2_ctrl_ops, V4L2_CID_VBLANK,
+				  mode->vts_min - mode->height,
+				  GC05A2_VTS_MAX - mode->height, 1,
+				  mode->vts_def - mode->height);
+
+	h_blank = mode->hts - mode->width;
+	gc05a2->hblank = v4l2_ctrl_new_std(ctrl_hdlr, &gc05a2_ctrl_ops,
+					   V4L2_CID_HBLANK, h_blank, h_blank, 1,
+					   h_blank);
+	if (gc05a2->hblank)
+		gc05a2->hblank->flags |= V4L2_CTRL_FLAG_READ_ONLY;
+
+	v4l2_ctrl_new_std(ctrl_hdlr, &gc05a2_ctrl_ops,
+			  V4L2_CID_ANALOGUE_GAIN, GC05A2_AGAIN_MIN,
+			  GC05A2_AGAIN_MAX, GC05A2_AGAIN_STEP,
+			  GC05A2_AGAIN_MIN);
+
+	exposure_max = mode->vts_def - GC05A2_EXP_MARGIN;
+	gc05a2->exposure = v4l2_ctrl_new_std(ctrl_hdlr, &gc05a2_ctrl_ops,
+					     V4L2_CID_EXPOSURE, GC05A2_EXP_MIN,
+					     exposure_max, GC05A2_EXP_STEP,
+					     exposure_max);
+
+	v4l2_ctrl_new_std_menu_items(ctrl_hdlr, &gc05a2_ctrl_ops,
+				     V4L2_CID_TEST_PATTERN,
+				     ARRAY_SIZE(gc05a2_test_pattern_menu) - 1,
+				     0, 0, gc05a2_test_pattern_menu);
+
+	/* register properties to fwnode (e.g. rotation, orientation) */
+	ret = v4l2_fwnode_device_parse(&client->dev, &props);
+	if (ret)
+		goto error_ctrls;
+
+	ret = v4l2_ctrl_new_fwnode_properties(ctrl_hdlr, ops, &props);
+	if (ret)
+		goto error_ctrls;
+
+	if (ctrl_hdlr->error) {
+		ret = ctrl_hdlr->error;
+		goto error_ctrls;
+	}
+
+	gc05a2->sd.ctrl_handler = ctrl_hdlr;
+
+	return 0;
+
+error_ctrls:
+	v4l2_ctrl_handler_free(ctrl_hdlr);
+
+	return ret;
+}
+
+static int gc05a2_probe(struct i2c_client *client)
+{
+	struct device *dev = &client->dev;
+	struct gc05a2 *gc05a2;
+	int ret;
+
+	gc05a2 = devm_kzalloc(dev, sizeof(*gc05a2), GFP_KERNEL);
+	if (!gc05a2)
+		return -ENOMEM;
+
+	gc05a2->dev = dev;
+
+	ret = gc05a2_parse_fwnode(gc05a2);
+	if (ret)
+		return ret;
+
+	gc05a2->regmap = devm_cci_regmap_init_i2c(client, 16);
+	if (IS_ERR(gc05a2->regmap))
+		return dev_err_probe(dev, PTR_ERR(gc05a2->regmap),
+				     "failed to init CCI\n");
+
+	gc05a2->xclk = devm_clk_get(dev, NULL);
+	if (IS_ERR(gc05a2->xclk))
+		return dev_err_probe(dev, PTR_ERR(gc05a2->xclk),
+				     "failed to get xclk\n");
+
+	ret = clk_set_rate(gc05a2->xclk, GC05A2_DEFAULT_CLK_FREQ);
+	if (ret)
+		return dev_err_probe(dev, ret,
+				     "failed to set xclk frequency\n");
+
+	ret = gc05a2_get_regulators(dev, gc05a2);
+	if (ret < 0)
+		return dev_err_probe(dev, ret,
+				     "failed to get regulators\n");
+
+	gc05a2->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
+	if (IS_ERR(gc05a2->reset_gpio))
+		return dev_err_probe(dev, PTR_ERR(gc05a2->reset_gpio),
+				     "failed to get gpio\n");
+
+	v4l2_i2c_subdev_init(&gc05a2->sd, client, &gc05a2_subdev_ops);
+	gc05a2->sd.internal_ops = &gc05a2_internal_ops;
+	gc05a2->cur_mode = &gc05a2_modes[0];
+
+	ret = gc05a2_init_controls(gc05a2);
+	if (ret)
+		return dev_err_probe(dev, ret,
+				     "failed to init controls\n");
+
+	gc05a2->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE |
+			    V4L2_SUBDEV_FL_HAS_EVENTS;
+	gc05a2->pad.flags = MEDIA_PAD_FL_SOURCE;
+	gc05a2->sd.dev = &client->dev;
+	gc05a2->sd.entity.function = MEDIA_ENT_F_CAM_SENSOR;
+
+	ret = media_entity_pads_init(&gc05a2->sd.entity, 1, &gc05a2->pad);
+	if (ret < 0) {
+		dev_err_probe(dev, ret, "could not register media entity\n");
+		goto err_v4l2_ctrl_handler_free;
+	}
+
+	gc05a2->sd.state_lock = gc05a2->ctrls.lock;
+	ret = v4l2_subdev_init_finalize(&gc05a2->sd);
+	if (ret < 0) {
+		dev_err_probe(dev, ret, "v4l2 subdev init error\n");
+		goto err_media_entity_cleanup;
+	}
+
+	pm_runtime_enable(gc05a2->dev);
+	pm_runtime_set_autosuspend_delay(gc05a2->dev, 1000);
+	pm_runtime_use_autosuspend(gc05a2->dev);
+	pm_runtime_idle(gc05a2->dev);
+
+	ret = v4l2_async_register_subdev_sensor(&gc05a2->sd);
+	if (ret < 0) {
+		dev_err_probe(dev, ret, "could not register v4l2 device\n");
+		goto err_rpm;
+	}
+
+	return 0;
+
+err_rpm:
+	pm_runtime_disable(gc05a2->dev);
+	v4l2_subdev_cleanup(&gc05a2->sd);
+
+err_media_entity_cleanup:
+	media_entity_cleanup(&gc05a2->sd.entity);
+
+err_v4l2_ctrl_handler_free:
+	v4l2_ctrl_handler_free(&gc05a2->ctrls);
+
+	return ret;
+}
+
+static void gc05a2_remove(struct i2c_client *client)
+{
+	struct v4l2_subdev *sd = i2c_get_clientdata(client);
+	struct gc05a2 *gc05a2 = to_gc05a2(sd);
+
+	v4l2_async_unregister_subdev(&gc05a2->sd);
+	v4l2_subdev_cleanup(sd);
+	media_entity_cleanup(&gc05a2->sd.entity);
+	v4l2_ctrl_handler_free(&gc05a2->ctrls);
+
+	pm_runtime_disable(&client->dev);
+	if (!pm_runtime_status_suspended(&client->dev))
+		gc05a2_power_off(gc05a2->dev);
+	pm_runtime_set_suspended(&client->dev);
+}
+
+static const struct of_device_id gc05a2_of_match[] = {
+	{ .compatible = "galaxycore,gc05a2" },
+	{}
+};
+MODULE_DEVICE_TABLE(of, gc05a2_of_match);
+
+static DEFINE_RUNTIME_DEV_PM_OPS(gc05a2_pm_ops,
+				 gc05a2_power_off,
+				 gc05a2_power_on,
+				 NULL);
+
+static struct i2c_driver gc05a2_i2c_driver = {
+	.driver = {
+		.of_match_table = gc05a2_of_match,
+		.pm = pm_ptr(&gc05a2_pm_ops),
+		.name  = "gc05a2",
+	},
+	.probe = gc05a2_probe,
+	.remove = gc05a2_remove,
+};
+module_i2c_driver(gc05a2_i2c_driver);
+
+MODULE_DESCRIPTION("GalaxyCore gc05a2 Camera driver");
+MODULE_AUTHOR("Zhi Mao <zhi.mao@mediatek.com>");
+MODULE_LICENSE("GPL");