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* [PATCH 0/3] media: suppport ov02a10 sensor driver
@ 2019-05-23 10:22 dongchun.zhu
  2019-05-23 10:22 ` [PATCH 1/3] media: i2c: ov02a10: Add ov02a10 camera " dongchun.zhu
                   ` (2 more replies)
  0 siblings, 3 replies; 14+ messages in thread
From: dongchun.zhu @ 2019-05-23 10:22 UTC (permalink / raw)
  To: mchehab, robh+dt, mark.rutland, matthias.bgg, bingbu.cao
  Cc: srv_heupstream, linux-mediatek, linux-arm-kernel, sj.huang,
	linux-media, devicetree, louis.kuo, menghui.lin, shengnan.wang,
	dongchun.zhu

From: Dongchun Zhu <dongchun.zhu@mediatek.com>

Hello,

This is the OV02A10 sensor driver, which would be used in camera features on CrOS application.

The driver is implemented wth V4L2 framework.
1. Async registered as a V4L2 I2C sub-device.
2. A media entity that can provide several source pads and sink pads to link with other device like Seninf, ISP one after another
   to create a default overall camera topology, image frame or meta-data from sensor can flow through particular path to output
   preview or capture image or 3A info.

Dongchun Zhu (3):
  media: i2c: ov02a10: Add ov02a10 camera sensor driver
  media: i2c: ov02a10: Add CONFIG_VIDEO_OV02A10
  media: dt-bindings: media: i2c: Add bindings for ov02a10

 .../devicetree/bindings/media/i2c/ov02a10.txt      |   43 +
 drivers/media/i2c/Kconfig                          |   12 +
 drivers/media/i2c/Makefile                         |    1 +
 drivers/media/i2c/ov02a10.c                        | 1067 ++++++++++++++++++++
 4 files changed, 1123 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/media/i2c/ov02a10.txt
 create mode 100644 drivers/media/i2c/ov02a10.c

-- 
2.9.2


^ permalink raw reply	[flat|nested] 14+ messages in thread

* [PATCH 1/3] media: i2c: ov02a10: Add ov02a10 camera sensor driver
  2019-05-23 10:22 [PATCH 0/3] media: suppport ov02a10 sensor driver dongchun.zhu
@ 2019-05-23 10:22 ` " dongchun.zhu
  2019-05-26  8:53   ` Nicolas Boichat
                     ` (2 more replies)
  2019-05-23 10:22 ` [PATCH 2/3] media: i2c: ov02a10: Add CONFIG_VIDEO_OV02A10 dongchun.zhu
  2019-05-23 10:22 ` [PATCH 3/3] media: dt-bindings: media: i2c: Add bindings for ov02a10 dongchun.zhu
  2 siblings, 3 replies; 14+ messages in thread
From: dongchun.zhu @ 2019-05-23 10:22 UTC (permalink / raw)
  To: mchehab, robh+dt, mark.rutland, matthias.bgg, bingbu.cao
  Cc: srv_heupstream, linux-mediatek, linux-arm-kernel, sj.huang,
	linux-media, devicetree, louis.kuo, menghui.lin, shengnan.wang,
	dongchun.zhu

From: Dongchun Zhu <dongchun.zhu@mediatek.com>

Add a V4L2 sub-device driver for the OmniVision image sensor.
This is a camera sensor using the I2C bus for control and the
CSI-2 bus for data.

Signed-off-by: Dongchun Zhu <dongchun.zhu@mediatek.com>
---
 drivers/media/i2c/Makefile  |    1 +
 drivers/media/i2c/ov02a10.c | 1067 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 1068 insertions(+)
 create mode 100644 drivers/media/i2c/ov02a10.c

diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
index d8ad9da..4b8f67b 100644
--- a/drivers/media/i2c/Makefile
+++ b/drivers/media/i2c/Makefile
@@ -63,6 +63,7 @@ obj-$(CONFIG_VIDEO_VP27SMPX) += vp27smpx.o
 obj-$(CONFIG_VIDEO_SONY_BTF_MPX) += sony-btf-mpx.o
 obj-$(CONFIG_VIDEO_UPD64031A) += upd64031a.o
 obj-$(CONFIG_VIDEO_UPD64083) += upd64083.o
+obj-$(CONFIG_VIDEO_OV02A10) += ov02a10.o
 obj-$(CONFIG_VIDEO_OV2640) += ov2640.o
 obj-$(CONFIG_VIDEO_OV2680) += ov2680.o
 obj-$(CONFIG_VIDEO_OV2685) += ov2685.o
diff --git a/drivers/media/i2c/ov02a10.c b/drivers/media/i2c/ov02a10.c
new file mode 100644
index 0000000..39472ff
--- /dev/null
+++ b/drivers/media/i2c/ov02a10.c
@@ -0,0 +1,1067 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * A V4L2 driver for OmniVision OV02A10 cameras.
+ *
+ * Based on Omnivision OV02A10 Camera Driver
+ * Copyright (C) 2019 MediaTek Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed .as is. WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/clk.h>
+#include <linux/device.h>
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/pm_runtime.h>
+#include <linux/regulator/consumer.h>
+#include <linux/sysfs.h>
+#include <media/media-entity.h>
+#include <media/v4l2-async.h>
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-subdev.h>
+
+#define CHIP_ID                                         0x2509
+#define OV02A10_REG_CHIP_ID_H                           0x02
+#define OV02A10_REG_CHIP_ID_L                           0x03
+#define OV02A10_ID(_msb, _lsb)                          ((_msb) << 8 | (_lsb))
+
+/* bit[1] vertical upside down */
+/* bit[0] horizontal mirror */
+#define OV02A10_REG_UPDOWN_MIRROR                       0x3F
+
+/* enable mirror & flip global effective */
+#define OV02A10_REG_UPDOWN_MIRROR_ENABLE                0x01
+
+#define ov02a10_XVCLK_FREQ                              24000000
+#define REG_SC_CTRL_MODE                                0xac
+
+#define SC_CTRL_MODE_STANDBY                            0x00
+#define SC_CTRL_MODE_STREAMING                          0x01
+
+#define ov02a10_REG_EXPOSURE_H                          0x03
+#define ov02a10_REG_EXPOSURE_L                          0x04
+#define	ov02a10_EXPOSURE_MIN                            4
+#define	ov02a10_EXPOSURE_STEP                           1
+
+#define ov02a10_REG_VTS_H                               0x05
+#define ov02a10_REG_VTS_L                               0x06
+#define ov02a10_VTS_MAX                                 0x209f
+#define ov02a10_VTS_MIN                                 0x04cf
+
+#define ov02a10_REG_GAIN                                0x24
+#define ov02a10_GAIN_MIN                                0x10
+#define ov02a10_GAIN_MAX                                0xf8
+#define ov02a10_GAIN_STEP                               0x01
+#define ov02a10_GAIN_DEFAULT                            0x40
+
+#define ov02a10_REG_TEST_PATTERN                        0x0d
+#define ov02a10_TEST_PATTERN_DISABLED                   0x00
+#define ov02a10_TEST_PATTERN_COLOR_BAR                  0x01
+
+#define REG_NULL                                        0xFF
+
+#define ov02a10_LANES                                   1
+#define ov02a10_BITS_PER_SAMPLE                         10
+
+static const char * const ov02a10_supply_names[] = {
+	"avdd",		/* Analog power */
+	"dovdd",	/* Digital I/O power */
+	"dvdd",		/* Digital core power */
+};
+
+#define ov02a10_NUM_SUPPLIES ARRAY_SIZE(ov02a10_supply_names)
+
+struct regval {
+	u16 addr;
+	u8 val;
+};
+
+struct ov02a10_mode {
+	u32 width;
+	u32 height;
+	u32 exp_def;
+	u32 hts_def;
+	u32 vts_def;
+	const struct regval *reg_list;
+};
+
+struct ov02a10 {
+	struct i2c_client	*client;
+	struct clk		*xvclk;
+	struct gpio_desc	*pwdn_gpio;
+	struct gpio_desc	*reset_gpio;
+	struct regulator_bulk_data supplies[ov02a10_NUM_SUPPLIES];
+
+	bool			streaming;
+	bool			upside_down;
+
+	/*
+	 * Serialize control access, get/set format, get selection
+	 * and start streaming.
+	 */
+	struct mutex		mutex;
+	struct v4l2_subdev	subdev;
+	struct media_pad	pad;
+	struct v4l2_ctrl	*anal_gain;
+	struct v4l2_ctrl	*exposure;
+	struct v4l2_ctrl	*hblank;
+	struct v4l2_ctrl	*vblank;
+	struct v4l2_ctrl	*test_pattern;
+	struct v4l2_ctrl_handler ctrl_handler;
+
+	const struct ov02a10_mode *cur_mode;
+};
+
+#define to_ov02a10(sd) container_of(sd, struct ov02a10, subdev)
+
+/* test pattern output */
+static struct regval ov02a10_test_pattern_regs[] = {
+	{0xfd, 0x01},
+	{0x0d, 0x00},
+	{0xb6, 0x01},
+	{0x01, 0x01},
+	{0xfd, 0x01},
+	{0xac, 0x01},
+	{REG_NULL, 0x00}
+};
+
+/*
+ * Xclk 24Mhz
+ * Pclk 39Mhz
+ * linelength 934(0x3a6)
+ * framelength 1390(0x56E)
+ * grabwindow_width 1600
+ * grabwindow_height 1200
+ * max_framerate 30fps
+ * mipi_datarate per lane 780Mbps
+ */
+static struct regval ov02a10_1600x1200_regs[] = {
+	{0xfd, 0x01},
+	{0xac, 0x00},
+	{0xfd, 0x00},
+	{0x2f, 0x29},
+	{0x34, 0x00},
+	{0x35, 0x21},
+	{0x30, 0x15},
+	{0x33, 0x01},
+	{0xfd, 0x01},
+	{0x44, 0x00},
+	{0x2a, 0x4c},
+	{0x2b, 0x1e},
+	{0x2c, 0x60},
+	{0x25, 0x11},
+	{0x03, 0x01},
+	{0x04, 0xae},
+	{0x09, 0x00},
+	{0x0a, 0x02},
+	{0x06, 0xa6},
+	{0x31, 0x00},
+	{0x24, 0x40},
+	{0x01, 0x01},
+	{0xfb, 0x73},
+	{0xfd, 0x01},
+	{0x16, 0x04},
+	{0x1c, 0x09},
+	{0x21, 0x42},
+	{0x12, 0x04},
+	{0x13, 0x10},
+	{0x11, 0x40},
+	{0x33, 0x81},
+	{0xd0, 0x00},
+	{0xd1, 0x01},
+	{0xd2, 0x00},
+	{0x50, 0x10},
+	{0x51, 0x23},
+	{0x52, 0x20},
+	{0x53, 0x10},
+	{0x54, 0x02},
+	{0x55, 0x20},
+	{0x56, 0x02},
+	{0x58, 0x48},
+	{0x5d, 0x15},
+	{0x5e, 0x05},
+	{0x66, 0x66},
+	{0x68, 0x68},
+	{0x6b, 0x00},
+	{0x6c, 0x00},
+	{0x6f, 0x40},
+	{0x70, 0x40},
+	{0x71, 0x0a},
+	{0x72, 0xf0},
+	{0x73, 0x10},
+	{0x75, 0x80},
+	{0x76, 0x10},
+	{0x84, 0x00},
+	{0x85, 0x10},
+	{0x86, 0x10},
+	{0x87, 0x00},
+	{0x8a, 0x22},
+	{0x8b, 0x22},
+	{0x19, 0xf1},
+	{0x29, 0x01},
+	{0xfd, 0x01},
+	{0x9d, 0x96},
+	{0xa0, 0x29},
+	{0xa1, 0x05},
+	{0xad, 0x62},
+	{0xae, 0x00},
+	{0xaf, 0x85},
+	{0xb1, 0x01},
+	{0x8e, 0x06},
+	{0x8f, 0x40},
+	{0x90, 0x04},
+	{0x91, 0xb0},
+	{0x45, 0x01},
+	{0x46, 0x00},
+	{0x47, 0x6c},
+	{0x48, 0x03},
+	{0x49, 0x8b},
+	{0x4a, 0x00},
+	{0x4b, 0x07},
+	{0x4c, 0x04},
+	{0x4d, 0xb7},
+	{0xf0, 0x40},
+	{0xf1, 0x40},
+	{0xf2, 0x40},
+	{0xf3, 0x40},
+	{0x3f, 0x00},
+	{0xfd, 0x01},
+	{0x05, 0x00},
+	{0x06, 0xa6},
+	{0xfd, 0x01},
+	{REG_NULL, 0x00}
+};
+
+#define ov02a10_LINK_FREQ_390MHZ		390000000
+static const s64 link_freq_menu_items[] = {
+	ov02a10_LINK_FREQ_390MHZ
+};
+
+static const char * const ov02a10_test_pattern_menu[] = {
+	"Disabled",
+	"Color Bar",
+};
+
+static const int ov02a10_test_pattern_val[] = {
+	ov02a10_TEST_PATTERN_DISABLED,
+	ov02a10_TEST_PATTERN_COLOR_BAR,
+};
+
+static const struct ov02a10_mode supported_modes[] = {
+	{
+		.width = 1600,
+		.height = 1200,
+		.exp_def = 0x01ae,
+		.hts_def = 0x03a6,
+		.vts_def = 0x056e,
+		.reg_list = ov02a10_1600x1200_regs,
+	},
+};
+
+/* write a register */
+static int ov02a10_write_reg(struct i2c_client *client, u8 addr, u8 val)
+{
+	u8 buf[2] = { addr, val };
+
+	int ret = i2c_master_send(client, buf, 2);
+
+	if (ret < 0) {
+		dev_err(&client->dev, "%s: error: reg=%x, val=%x\n",
+			__func__, addr, val);
+		return ret;
+	}
+
+	return ret == 2 ? 0 : ret;
+}
+
+static int ov02a10_write_array(struct i2c_client *client,
+			       const struct regval *regs)
+{
+	int ret = 0;
+	u32 i;
+
+	for (i = 0; ret == 0 && regs[i].addr != REG_NULL; i++) {
+		ret = ov02a10_write_reg(client, regs[i].addr, regs[i].val);
+		if (ret < 0)
+			return ret;
+	}
+
+	return 0;
+}
+
+/* read a register */
+static int ov02a10_read_reg(struct i2c_client *client, u8 reg, u8 *val)
+{
+	int ret;
+	u8 data = reg;
+	struct i2c_msg msg = {
+		.addr	= client->addr,
+		.flags	= 0,
+		.len	= 1,
+		.buf	= &data,
+	};
+
+	ret = i2c_transfer(client->adapter, &msg, 1);
+	if (ret < 0) {
+		dev_err(&client->dev, "i2c_transfer failed, ret %d\n", ret);
+		goto err;
+	}
+
+	msg.flags = I2C_M_RD;
+	ret = i2c_transfer(client->adapter, &msg, 1);
+	if (ret < 0) {
+		dev_err(&client->dev, "i2c_transfer --I2C_M_RD failed, \
+			ret %d\n", ret);
+		goto err;
+	}
+
+	*val = data;
+	return 0;
+
+err:
+	dev_err(&client->dev, "Failed reading register 0x%02x!\n", reg);
+	return ret;
+}
+
+static void ov02a10_fill_fmt(const struct ov02a10_mode *mode,
+			     struct v4l2_mbus_framefmt *fmt)
+{
+	fmt->code = MEDIA_BUS_FMT_SBGGR10_1X10;
+	fmt->width = mode->width;
+	fmt->height = mode->height;
+	fmt->field = V4L2_FIELD_NONE;
+}
+
+static int ov02a10_set_fmt(struct v4l2_subdev *sd,
+			   struct v4l2_subdev_pad_config *cfg,
+			   struct v4l2_subdev_format *fmt)
+{
+	struct ov02a10 *ov02a10 = to_ov02a10(sd);
+	struct v4l2_mbus_framefmt *mbus_fmt = &fmt->format;
+
+	/* only one mode supported for now */
+	ov02a10_fill_fmt(ov02a10->cur_mode, mbus_fmt);
+
+	return 0;
+}
+
+static int ov02a10_get_fmt(struct v4l2_subdev *sd,
+			   struct v4l2_subdev_pad_config *cfg,
+			   struct v4l2_subdev_format *fmt)
+{
+	struct ov02a10 *ov02a10 = to_ov02a10(sd);
+	struct v4l2_mbus_framefmt *mbus_fmt = &fmt->format;
+
+	ov02a10_fill_fmt(ov02a10->cur_mode, mbus_fmt);
+
+	return 0;
+}
+
+static int ov02a10_enum_mbus_code(struct v4l2_subdev *sd,
+				  struct v4l2_subdev_pad_config *cfg,
+				  struct v4l2_subdev_mbus_code_enum *code)
+{
+	if (code->index >= ARRAY_SIZE(supported_modes))
+		return -EINVAL;
+
+	code->code = MEDIA_BUS_FMT_SBGGR10_1X10;
+
+	return 0;
+}
+
+static int ov02a10_enum_frame_sizes(struct v4l2_subdev *sd,
+				    struct v4l2_subdev_pad_config *cfg,
+				    struct v4l2_subdev_frame_size_enum *fse)
+{
+	int index = fse->index;
+
+	if (index >= ARRAY_SIZE(supported_modes))
+		return -EINVAL;
+
+	fse->code = MEDIA_BUS_FMT_SBGGR10_1X10;
+
+	fse->min_width  = supported_modes[index].width;
+	fse->max_width  = supported_modes[index].width;
+	fse->max_height = supported_modes[index].height;
+	fse->min_height = supported_modes[index].height;
+
+	return 0;
+}
+
+static int __ov02a10_power_on(struct ov02a10 *ov02a10)
+{
+	int ret;
+
+	struct device *dev = &ov02a10->client->dev;
+
+	ret = clk_prepare_enable(ov02a10->xvclk);
+	if (ret < 0) {
+		dev_err(dev, "Failed to enable xvclk\n");
+		return ret;
+	}
+
+	/* note: set 0 is high, set 1 is low */
+	gpiod_set_value_cansleep(ov02a10->reset_gpio, 1);
+	gpiod_set_value_cansleep(ov02a10->pwdn_gpio, 0);
+
+	ret = regulator_bulk_enable(ov02a10_NUM_SUPPLIES, ov02a10->supplies);
+	if (ret < 0) {
+		dev_err(dev, "Failed to enable regulators\n");
+		goto disable_clk;
+	}
+	usleep_range(7 * 1000, 8 * 1000);
+
+	gpiod_set_value_cansleep(ov02a10->pwdn_gpio, 1);
+	usleep_range(10 * 1000, 12 * 1000);
+
+	gpiod_set_value_cansleep(ov02a10->reset_gpio, 0);
+	usleep_range(10 * 1000, 12 * 1000);
+
+#ifdef SENSOR_HARDWARE_RESET
+	/* sensor hardware reset */
+	gpiod_set_value_cansleep(ov02a10->reset_gpio, 1);
+	usleep_range(10 * 1000, 12 * 1000);
+	gpiod_set_value_cansleep(ov02a10->reset_gpio, 0);
+	usleep_range(10 * 1000, 12 * 1000);
+#endif
+
+	return 0;
+
+disable_clk:
+	clk_disable_unprepare(ov02a10->xvclk);
+
+	return ret;
+}
+
+static void __ov02a10_power_off(struct ov02a10 *ov02a10)
+{
+	clk_disable_unprepare(ov02a10->xvclk);
+	gpiod_set_value_cansleep(ov02a10->reset_gpio, 1);
+	gpiod_set_value_cansleep(ov02a10->pwdn_gpio, 1);
+	regulator_bulk_disable(ov02a10_NUM_SUPPLIES, ov02a10->supplies);
+}
+
+static int __ov02a10_start_stream(struct ov02a10 *ov02a10)
+{
+	int ret;
+
+	ret = ov02a10_write_array(ov02a10->client, ov02a10->cur_mode->reg_list);
+	if (ret)
+		return ret;
+
+	ret = __v4l2_ctrl_handler_setup(&ov02a10->ctrl_handler);
+	if (ret) {
+		pr_err("__v4l2_ctrl_handler_setup fail %d\n", ret);
+		return ret;
+	}
+
+	return ov02a10_write_reg(ov02a10->client,
+				 REG_SC_CTRL_MODE, SC_CTRL_MODE_STREAMING);
+}
+
+static int __ov02a10_stop_stream(struct ov02a10 *ov02a10)
+{
+	return ov02a10_write_reg(ov02a10->client,
+				 REG_SC_CTRL_MODE, SC_CTRL_MODE_STANDBY);
+}
+
+static int ov02a10_s_stream(struct v4l2_subdev *sd, int on)
+{
+	struct ov02a10 *ov02a10 = to_ov02a10(sd);
+	struct i2c_client *client = ov02a10->client;
+	int ret = 0;
+
+	pr_info("ov02a10 s_stream-(%d)\n", on);
+	mutex_lock(&ov02a10->mutex);
+
+	if (ov02a10->streaming == !on) {
+		if (on) {
+			ret = pm_runtime_get_sync(&client->dev);
+			if (ret < 0) {
+				pm_runtime_put_noidle(&client->dev);
+				goto unlock_and_return;
+			}
+
+			ret = __ov02a10_start_stream(ov02a10);
+			if (ret) {
+				v4l2_err(sd, "start stream failed while write regs\n");
+				pm_runtime_put(&client->dev);
+				goto unlock_and_return;
+			}
+		} else {
+			__ov02a10_stop_stream(ov02a10);
+			pm_runtime_put(&client->dev);
+		}
+
+		ov02a10->streaming = on;
+	}
+
+unlock_and_return:
+	mutex_unlock(&ov02a10->mutex);
+
+	return ret;
+}
+
+#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
+static int ov02a10_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
+{
+	struct ov02a10 *ov02a10 = to_ov02a10(sd);
+	struct v4l2_mbus_framefmt *try_fmt;
+
+	mutex_lock(&ov02a10->mutex);
+
+	try_fmt = v4l2_subdev_get_try_format(sd, fh->pad, 0);
+	/* Initialize try_fmt */
+	ov02a10_fill_fmt(&supported_modes[0], try_fmt);
+
+	mutex_unlock(&ov02a10->mutex);
+
+	return 0;
+}
+#endif
+
+static int __maybe_unused ov02a10_runtime_resume(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct v4l2_subdev *sd = i2c_get_clientdata(client);
+	struct ov02a10 *ov02a10 = to_ov02a10(sd);
+
+	return __ov02a10_power_on(ov02a10);
+}
+
+static int __maybe_unused ov02a10_runtime_suspend(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct v4l2_subdev *sd = i2c_get_clientdata(client);
+	struct ov02a10 *ov02a10 = to_ov02a10(sd);
+
+	if (ov02a10->streaming == 1) {
+		__ov02a10_stop_stream(ov02a10);
+		ov02a10->streaming = 0;
+	}
+	__ov02a10_power_off(ov02a10);
+
+	return 0;
+}
+
+static const struct dev_pm_ops ov02a10_pm_ops = {
+	SET_RUNTIME_PM_OPS(ov02a10_runtime_suspend,
+			   ov02a10_runtime_resume, NULL)
+};
+
+static int ov02a10_mod_reg(struct ov02a10 *ov02a10, u16 reg,
+			   u8 mask, u8 val)
+{
+	u8 read_val;
+	int ret;
+
+	ret = ov02a10_read_reg(ov02a10->client, reg, &read_val);
+	if (ret)
+		return ret;
+
+	read_val &= ~mask;
+	val &= mask;
+	val |= read_val;
+
+	return ov02a10_write_reg(ov02a10->client, reg, val);
+}
+
+/* mirror & flip reg setting effective */
+static int ov02a10_bayer_order(struct ov02a10 *ov02a10)
+{
+	int ret;
+
+	ret = ov02a10_write_reg(ov02a10->client,
+				OV02A10_REG_UPDOWN_MIRROR_ENABLE,
+				SC_CTRL_MODE_STREAMING);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static int ov02a10_set_ctrl_hflip(struct ov02a10 *ov02a10, int value)
+{
+	/*
+	 * If sensor is mounted upside down, mirror logic is inversed.
+	 *
+	 * Sensor is a BSI (Back Side Illuminated) one,
+	 * so image captured is physically mirrored.
+	 * This is why mirror logic is inversed in
+	 * order to cancel this mirror effect.
+	 */
+
+	/*
+	 * P1: 0x3F:
+	 * - [1]:	Vertical upside down
+	 * - [0]:	Horizontal mirror
+	 */
+
+	int ret;
+
+	ret = ov02a10_mod_reg(ov02a10, OV02A10_REG_UPDOWN_MIRROR,
+			      BIT(0),
+			      (!(value ^ ov02a10->upside_down)) ?
+			      BIT(0) : 0);
+
+	if (ret < 0)
+		return ret;
+
+	return ov02a10_bayer_order(ov02a10);
+}
+
+static int ov02a10_set_ctrl_vflip(struct ov02a10 *ov02a10, int value)
+{
+	/* If sensor is mounted upside down, flip logic is inversed */
+
+	/*
+	 * P1: 0x3F:
+	 * - [1]:	Vertical upside down
+	 * - [0]:	Horizontal mirror
+	 */
+
+	int ret;
+
+	ret = ov02a10_mod_reg(ov02a10, OV02A10_REG_UPDOWN_MIRROR,
+			      BIT(1),
+			      (value ^ ov02a10->upside_down) ?
+			      BIT(1) : 0);
+
+	if (ret < 0)
+		return ret;
+
+	return ov02a10_bayer_order(ov02a10);
+}
+
+static int ov02a10_set_test_pattern(struct ov02a10 *ov02a10, s32 value)
+{
+	int ret = 0;
+
+	if (value)
+		return ov02a10_write_array(ov02a10->client,
+					   ov02a10_test_pattern_regs);
+
+	return ret;
+}
+
+static int ov02a10_set_ctrl(struct v4l2_ctrl *ctrl)
+{
+	struct ov02a10 *ov02a10 = container_of(ctrl->handler,
+					     struct ov02a10, ctrl_handler);
+	struct i2c_client *client = ov02a10->client;
+	s64 max_expo;
+	int ret = 0;
+
+	/* Propagate change of current control to all related controls */
+	switch (ctrl->id) {
+	case V4L2_CID_VBLANK:
+		/* Update max exposure while meeting expected vblanking */
+		max_expo = ov02a10->cur_mode->height + ctrl->val - 4;
+		__v4l2_ctrl_modify_range(ov02a10->exposure,
+					 ov02a10->exposure->minimum, max_expo,
+					 ov02a10->exposure->step,
+					 ov02a10->exposure->default_value);
+		break;
+	}
+
+	if (pm_runtime_get_if_in_use(&client->dev) <= 0)
+		return 0;
+
+	switch (ctrl->id) {
+	case V4L2_CID_EXPOSURE:
+		ret = ov02a10_write_reg(client, 0xfd, 0x01);
+		if (ret < 0)
+			return ret;
+		ret = ov02a10_write_reg(client, ov02a10_REG_EXPOSURE_H,
+					((ctrl->val >> 8) & 0xFF));
+		if (!ret) {
+			ret = ov02a10_write_reg(client, ov02a10_REG_EXPOSURE_L,
+						(ctrl->val & 0xFF));
+			if (ret < 0)
+				return ret;
+		}
+		ret = ov02a10_write_reg(client, 0x01, 0x01);
+		if (ret < 0)
+			return ret;
+		break;
+	case V4L2_CID_ANALOGUE_GAIN:
+		ret = ov02a10_write_reg(client, 0xfd, 0x01);
+		if (ret < 0)
+			return ret;
+		ret = ov02a10_write_reg(client, ov02a10_REG_GAIN,
+					(ctrl->val & 0xFF));
+		if (ret < 0)
+			return ret;
+		ret = ov02a10_write_reg(client, 0x01, 0x01);
+		if (ret < 0)
+			return ret;
+		break;
+	case V4L2_CID_VBLANK:
+		ret = ov02a10_write_reg(client, 0xfd, 0x01);
+		if (ret < 0)
+			return ret;
+		ret = ov02a10_write_reg(client, ov02a10_REG_VTS_H,
+					(((ctrl->val +
+					ov02a10->cur_mode->height - 1224) >> 8)
+					& 0xFF));
+		if (!ret) {
+			ret = ov02a10_write_reg(client, ov02a10_REG_VTS_L,
+						((ctrl->val +
+						ov02a10->cur_mode->height -
+						1224) & 0xFF));
+			if (ret < 0)
+				return ret;
+		}
+		ret = ov02a10_write_reg(client, 0x01, 0x01);
+		if (ret < 0)
+			return ret;
+		break;
+	case V4L2_CID_TEST_PATTERN:
+		ret =
+		 ov02a10_set_test_pattern(ov02a10,
+					  ov02a10_test_pattern_val[ctrl->val]);
+		break;
+	case V4L2_CID_HFLIP:
+		if (ov02a10->streaming)
+			return -EBUSY;
+		if (ctrl->val)
+			ret = ov02a10_set_ctrl_hflip(ov02a10, ctrl->val);
+		break;
+	case V4L2_CID_VFLIP:
+		if (ov02a10->streaming)
+			return -EBUSY;
+		if (ctrl->val)
+			ret = ov02a10_set_ctrl_vflip(ov02a10, ctrl->val);
+		break;
+	default:
+		dev_warn(&client->dev, "%s Unhandled id:0x%x, val:0x%x\n",
+			 __func__, ctrl->id, ctrl->val);
+		ret = -EINVAL;
+		break;
+	};
+
+	pm_runtime_put(&client->dev);
+
+	return ret;
+}
+
+static const struct v4l2_subdev_video_ops ov02a10_video_ops = {
+	.s_stream = ov02a10_s_stream,
+};
+
+static const struct v4l2_subdev_pad_ops ov02a10_pad_ops = {
+	.enum_mbus_code = ov02a10_enum_mbus_code,
+	.enum_frame_size = ov02a10_enum_frame_sizes,
+	.get_fmt = ov02a10_get_fmt,
+	.set_fmt = ov02a10_set_fmt,
+};
+
+static const struct v4l2_subdev_ops ov02a10_subdev_ops = {
+	.video	= &ov02a10_video_ops,
+	.pad	= &ov02a10_pad_ops,
+};
+
+#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
+static const struct v4l2_subdev_internal_ops ov02a10_internal_ops = {
+	.open = ov02a10_open,
+};
+#endif
+
+static const struct v4l2_ctrl_ops ov02a10_ctrl_ops = {
+	.s_ctrl = ov02a10_set_ctrl,
+};
+
+static int ov02a10_initialize_controls(struct ov02a10 *ov02a10)
+{
+	const struct ov02a10_mode *mode;
+	struct v4l2_ctrl_handler *handler;
+	struct v4l2_ctrl *ctrl;
+	u64 exposure_max;
+	u32 pixel_rate, h_blank;
+	int ret;
+
+	handler = &ov02a10->ctrl_handler;
+	mode = ov02a10->cur_mode;
+	ret = v4l2_ctrl_handler_init(handler, 8);
+	if (ret)
+		return ret;
+	handler->lock = &ov02a10->mutex;
+
+	ctrl = v4l2_ctrl_new_int_menu(handler, NULL, V4L2_CID_LINK_FREQ,
+				      0, 0, link_freq_menu_items);
+	if (ctrl)
+		ctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY;
+
+	pixel_rate = (link_freq_menu_items[0] * 2 * ov02a10_LANES) /
+		     ov02a10_BITS_PER_SAMPLE;
+	v4l2_ctrl_new_std(handler, NULL, V4L2_CID_PIXEL_RATE,
+			  0, pixel_rate, 1, pixel_rate);
+
+	h_blank = mode->hts_def - mode->width;
+	ov02a10->hblank = v4l2_ctrl_new_std(handler, NULL, V4L2_CID_HBLANK,
+					    h_blank, h_blank, 1, h_blank);
+	if (ov02a10->hblank)
+		ov02a10->hblank->flags |= V4L2_CTRL_FLAG_READ_ONLY;
+
+	ov02a10->vblank = v4l2_ctrl_new_std(handler, &ov02a10_ctrl_ops,
+					    V4L2_CID_VBLANK, mode->vts_def -
+					    mode->height,
+					    ov02a10_VTS_MAX - mode->height, 1,
+					    mode->vts_def - mode->height);
+
+	exposure_max = mode->vts_def - 4;
+	ov02a10->exposure = v4l2_ctrl_new_std(handler, &ov02a10_ctrl_ops,
+					      V4L2_CID_EXPOSURE,
+					      ov02a10_EXPOSURE_MIN,
+					      exposure_max,
+					      ov02a10_EXPOSURE_STEP,
+					      mode->exp_def);
+
+	ov02a10->anal_gain = v4l2_ctrl_new_std(handler, &ov02a10_ctrl_ops,
+					       V4L2_CID_ANALOGUE_GAIN,
+					       ov02a10_GAIN_MIN,
+					       ov02a10_GAIN_MAX,
+					       ov02a10_GAIN_STEP,
+					       ov02a10_GAIN_DEFAULT);
+
+	ov02a10->test_pattern =
+	   v4l2_ctrl_new_std_menu_items(handler,
+					&ov02a10_ctrl_ops,
+					V4L2_CID_TEST_PATTERN,
+					ARRAY_SIZE(ov02a10_test_pattern_menu) -
+					1, 0, 0, ov02a10_test_pattern_menu);
+
+	if (handler->error) {
+		ret = handler->error;
+		dev_err(&ov02a10->client->dev,
+			"Failed to init controls(%d)\n", ret);
+		goto err_free_handler;
+	}
+
+	ov02a10->subdev.ctrl_handler = handler;
+
+	return 0;
+
+err_free_handler:
+	v4l2_ctrl_handler_free(handler);
+
+	return ret;
+}
+
+static int ov02a10_check_sensor_id(struct ov02a10 *ov02a10,
+				   struct i2c_client *client)
+{
+	struct device *dev = &ov02a10->client->dev;
+	u8 pid = 0;
+	u8 ver = 0;
+	int ret;
+
+	/* Check sensor revision */
+	ret = ov02a10_read_reg(client, OV02A10_REG_CHIP_ID_H, &pid);
+	if (!ret)
+		ret = ov02a10_read_reg(client, OV02A10_REG_CHIP_ID_L, &ver);
+
+	if (!ret) {
+		unsigned short id;
+
+		id = OV02A10_ID(pid, ver);
+		dev_info(dev, "ov02a10_sensor id(%04x)\n", id);
+		if (id != CHIP_ID) {
+			dev_err(dev, "Unexpected sensor id(%04x), ret(%d)\n",
+				id, ret);
+			return ret;
+		}
+		dev_info(dev, "Detected OV%04X sensor\n", id);
+	}
+
+	return 0;
+}
+
+static int ov02a10_configure_regulators(struct ov02a10 *ov02a10)
+{
+	int i;
+
+	for (i = 0; i < ov02a10_NUM_SUPPLIES; i++)
+		ov02a10->supplies[i].supply = ov02a10_supply_names[i];
+
+	return devm_regulator_bulk_get(&ov02a10->client->dev,
+				       ov02a10_NUM_SUPPLIES,
+				       ov02a10->supplies);
+}
+
+static int ov02a10_probe(struct i2c_client *client,
+			 const struct i2c_device_id *id)
+{
+	struct device *dev = &client->dev;
+	struct ov02a10 *ov02a10;
+	u32 rotation;
+	int ret;
+
+	dev_info(dev, "ov02a10 probe ++\n");
+	ov02a10 = devm_kzalloc(dev, sizeof(*ov02a10), GFP_KERNEL);
+	if (!ov02a10)
+		return -ENOMEM;
+
+	ov02a10->client = client;
+	ov02a10->cur_mode = &supported_modes[0];
+
+	/* optional indication of physical rotation of sensor */
+	ret = fwnode_property_read_u32(dev_fwnode(dev), "rotation",
+				       &rotation);
+	if (!ret) {
+		switch (rotation) {
+		case 180:
+			ov02a10->upside_down = true;
+			/* fall through */
+		case 0:
+			break;
+		default:
+			dev_warn(dev, "%u degrees rotation is not supported, ignoring...\n",
+				 rotation);
+		}
+	}
+
+	ov02a10->xvclk = devm_clk_get(dev, "xvclk");
+	if (IS_ERR(ov02a10->xvclk)) {
+		dev_err(dev, "Failed to get xvclk\n");
+		return -EINVAL;
+	}
+	ret = clk_set_rate(ov02a10->xvclk, ov02a10_XVCLK_FREQ);
+	if (ret < 0) {
+		dev_err(dev, "Failed to set xvclk rate (24MHz)\n");
+		return ret;
+	}
+	if (clk_get_rate(ov02a10->xvclk) != ov02a10_XVCLK_FREQ)
+		dev_warn(dev, "xvclk mismatched, modes are based on 24MHz\n");
+
+	ov02a10->pwdn_gpio = devm_gpiod_get(dev, "pwdn", GPIOD_OUT_LOW);
+	if (IS_ERR(ov02a10->pwdn_gpio)) {
+		dev_err(dev, "Failed to get powerdown-gpios\n");
+		return -EINVAL;
+	}
+
+	ov02a10->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
+	if (IS_ERR(ov02a10->reset_gpio)) {
+		dev_err(dev, "Failed to get reset-gpios\n");
+		return -EINVAL;
+	}
+
+	ret = ov02a10_configure_regulators(ov02a10);
+	if (ret) {
+		dev_err(dev, "Failed to get power regulators\n");
+		return ret;
+	}
+
+	mutex_init(&ov02a10->mutex);
+	v4l2_i2c_subdev_init(&ov02a10->subdev, client, &ov02a10_subdev_ops);
+	ret = ov02a10_initialize_controls(ov02a10);
+	if (ret) {
+		dev_err(dev, "Failed to initialize controls\n");
+		goto err_destroy_mutex;
+	}
+
+	ret = __ov02a10_power_on(ov02a10);
+	if (ret) {
+		dev_err(dev, "Failed to power on\n");
+		goto err_free_handler;
+	}
+
+	ret = ov02a10_check_sensor_id(ov02a10, client);
+	if (ret) {
+		dev_err(dev, "Failed to detect id, go to power off\n");
+		goto err_power_off;
+	}
+
+#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
+	ov02a10->subdev.internal_ops = &ov02a10_internal_ops;
+	ov02a10->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
+#endif
+#if defined(CONFIG_MEDIA_CONTROLLER)
+	ov02a10->pad.flags = MEDIA_PAD_FL_SOURCE;
+	ov02a10->subdev.entity.function = MEDIA_ENT_F_CAM_SENSOR;
+	ret = media_entity_pads_init(&ov02a10->subdev.entity, 1, &ov02a10->pad);
+	if (ret < 0) {
+		dev_err(dev, "Failed init pads\n");
+		goto err_power_off;
+	}
+#endif
+
+	ret = v4l2_async_register_subdev(&ov02a10->subdev);
+	if (ret) {
+		dev_err(dev, "v4l2 async register subdev failed\n");
+		goto err_clean_entity;
+	}
+
+	pm_runtime_set_active(dev);
+	pm_runtime_enable(dev);
+	pm_runtime_idle(dev);
+	dev_info(dev, "ov02a10 probe --\n");
+
+	return 0;
+
+err_clean_entity:
+#if defined(CONFIG_MEDIA_CONTROLLER)
+	media_entity_cleanup(&ov02a10->subdev.entity);
+#endif
+err_power_off:
+	__ov02a10_power_off(ov02a10);
+err_free_handler:
+	v4l2_ctrl_handler_free(&ov02a10->ctrl_handler);
+err_destroy_mutex:
+	mutex_destroy(&ov02a10->mutex);
+
+	return ret;
+}
+
+static int ov02a10_remove(struct i2c_client *client)
+{
+	struct v4l2_subdev *sd = i2c_get_clientdata(client);
+	struct ov02a10 *ov02a10 = to_ov02a10(sd);
+
+	v4l2_async_unregister_subdev(sd);
+#if defined(CONFIG_MEDIA_CONTROLLER)
+	media_entity_cleanup(&sd->entity);
+#endif
+	v4l2_ctrl_handler_free(&ov02a10->ctrl_handler);
+	mutex_destroy(&ov02a10->mutex);
+
+	pm_runtime_disable(&client->dev);
+	if (!pm_runtime_status_suspended(&client->dev))
+		__ov02a10_power_off(ov02a10);
+	pm_runtime_set_suspended(&client->dev);
+
+	return 0;
+}
+
+#if IS_ENABLED(CONFIG_OF)
+static const struct of_device_id ov02a10_of_match[] = {
+	{ .compatible = "ovti,ov02a10" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, ov02a10_of_match);
+#endif
+
+static struct i2c_driver ov02a10_i2c_driver = {
+	.driver = {
+		.name = "ov02a10",
+		.pm = &ov02a10_pm_ops,
+		.of_match_table = of_match_ptr(ov02a10_of_match),
+	},
+	.probe		= &ov02a10_probe,
+	.remove		= &ov02a10_remove,
+};
+
+module_i2c_driver(ov02a10_i2c_driver);
+
+MODULE_AUTHOR("Dongchun Zhu <dongchun.zhu@mediatek.com>");
+MODULE_DESCRIPTION("OmniVision OV02A10 sensor driver");
+MODULE_LICENSE("GPL v2");
-- 
2.9.2


^ permalink raw reply	[flat|nested] 14+ messages in thread

* [PATCH 2/3] media: i2c: ov02a10: Add CONFIG_VIDEO_OV02A10
  2019-05-23 10:22 [PATCH 0/3] media: suppport ov02a10 sensor driver dongchun.zhu
  2019-05-23 10:22 ` [PATCH 1/3] media: i2c: ov02a10: Add ov02a10 camera " dongchun.zhu
@ 2019-05-23 10:22 ` dongchun.zhu
  2019-05-23 10:22 ` [PATCH 3/3] media: dt-bindings: media: i2c: Add bindings for ov02a10 dongchun.zhu
  2 siblings, 0 replies; 14+ messages in thread
From: dongchun.zhu @ 2019-05-23 10:22 UTC (permalink / raw)
  To: mchehab, robh+dt, mark.rutland, matthias.bgg, bingbu.cao
  Cc: srv_heupstream, linux-mediatek, linux-arm-kernel, sj.huang,
	linux-media, devicetree, louis.kuo, menghui.lin, shengnan.wang,
	dongchun.zhu

From: Dongchun Zhu <dongchun.zhu@mediatek.com>

Add CONFIG_VIDEO_OV02A10 to the Kconfig entry.

Signed-off-by: Dongchun Zhu <dongchun.zhu@mediatek.com>
---
 drivers/media/i2c/Kconfig | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
index 7793358..480aa42 100644
--- a/drivers/media/i2c/Kconfig
+++ b/drivers/media/i2c/Kconfig
@@ -615,6 +615,18 @@ config VIDEO_IMX355
 	  To compile this driver as a module, choose M here: the
 	  module will be called imx355.
 
+config VIDEO_OV02A10
+	tristate "OmniVision OV02A10 sensor support"
+	depends on I2C && VIDEO_V4L2 && VIDEO_V4L2_SUBDEV_API
+	depends on MEDIA_CAMERA_SUPPORT
+	select V4L2_FWNODE
+	help
+	  This is a Video4Linux2 sensor driver for the OmniVision
+	  OV02A10 camera.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called ov02a10.
+
 config VIDEO_OV2640
 	tristate "OmniVision OV2640 sensor support"
 	depends on VIDEO_V4L2 && I2C
-- 
2.9.2


^ permalink raw reply	[flat|nested] 14+ messages in thread

* [PATCH 3/3] media: dt-bindings: media: i2c: Add bindings for ov02a10
  2019-05-23 10:22 [PATCH 0/3] media: suppport ov02a10 sensor driver dongchun.zhu
  2019-05-23 10:22 ` [PATCH 1/3] media: i2c: ov02a10: Add ov02a10 camera " dongchun.zhu
  2019-05-23 10:22 ` [PATCH 2/3] media: i2c: ov02a10: Add CONFIG_VIDEO_OV02A10 dongchun.zhu
@ 2019-05-23 10:22 ` dongchun.zhu
  2019-05-31 16:16   ` Sakari Ailus
  2 siblings, 1 reply; 14+ messages in thread
From: dongchun.zhu @ 2019-05-23 10:22 UTC (permalink / raw)
  To: mchehab, robh+dt, mark.rutland, matthias.bgg, bingbu.cao
  Cc: srv_heupstream, linux-mediatek, linux-arm-kernel, sj.huang,
	linux-media, devicetree, louis.kuo, menghui.lin, shengnan.wang,
	dongchun.zhu

From: Dongchun Zhu <dongchun.zhu@mediatek.com>

Add device tree binding documentation for the OV02A10 CMOS image sensor.

Signed-off-by: Dongchun Zhu <dongchun.zhu@mediatek.com>
---
 .../devicetree/bindings/media/i2c/ov02a10.txt      | 43 ++++++++++++++++++++++
 1 file changed, 43 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/media/i2c/ov02a10.txt

diff --git a/Documentation/devicetree/bindings/media/i2c/ov02a10.txt b/Documentation/devicetree/bindings/media/i2c/ov02a10.txt
new file mode 100644
index 0000000..fdc2904
--- /dev/null
+++ b/Documentation/devicetree/bindings/media/i2c/ov02a10.txt
@@ -0,0 +1,43 @@
+* Omnivision OV02A10 MIPI CSI-2 sensor
+
+Required Properties:
+- compatible: shall be "ovti,ov02a10"
+- clocks: reference to the xvclk input clock
+- clock-names: shall be "xvclk"
+- avdd-supply: Analog voltage supply, 2.8 volts
+- dovdd-supply: Digital I/O voltage supply, 1.8 volts
+- dvdd-supply: Digital core voltage supply, 1.8 volts
+- reset-gpios: Low active reset gpio
+
+The device node shall contain one 'port' child node with an
+'endpoint' subnode for its digital output video port,
+in accordance with the video interface bindings defined in
+Documentation/devicetree/bindings/media/video-interfaces.txt.
+The endpoint optional property 'data-lanes' shall be "<1>".
+
+Example:
+&i2c4 {
+	sensor_sub: sensor_sub {
+		compatible = "ovti,ov02a10";
+		reg = <0x3d>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&camera_pins_cam1_mclk_on>;
+
+		clocks = <&topckgen CLK_TOP_MUX_CAMTG2>,
+			<&topckgen CLK_TOP_UNIVP_192M_D8>;
+		clock-names = "xvclk", "freq_mux";
+
+		avdd-supply = <&mt6358_vcama1_reg>;
+		dvdd-supply = <&mt6358_vcn18_reg>;
+		dovdd-supply = <&mt6358_vcamio_reg>;
+		pwdn-gpios = <&pio 107 1>;
+		reset-gpios = <&pio 109 1>;
+
+		port@0 {
+		   ov02a10_core: endpoint {
+		       remote-endpoint = <&ov02a10_0>;
+			   data-lanes = <1>;
+		   };
+		};
+	};
+};
-- 
2.9.2


^ permalink raw reply	[flat|nested] 14+ messages in thread

* Re: [PATCH 1/3] media: i2c: ov02a10: Add ov02a10 camera sensor driver
  2019-05-23 10:22 ` [PATCH 1/3] media: i2c: ov02a10: Add ov02a10 camera " dongchun.zhu
@ 2019-05-26  8:53   ` Nicolas Boichat
  2019-06-13  2:44     ` Dongchun Zhu
  2019-05-28  6:20   ` Bingbu Cao
  2019-05-31 17:03   ` Sakari Ailus
  2 siblings, 1 reply; 14+ messages in thread
From: Nicolas Boichat @ 2019-05-26  8:53 UTC (permalink / raw)
  To: dongchun.zhu
  Cc: mchehab, Rob Herring, Mark Rutland, Matthias Brugger, bingbu.cao,
	devicetree, srv_heupstream, menghui.lin, shengnan.wang, sj.huang,
	moderated list:ARM/Mediatek SoC support, louis.kuo,
	linux-arm Mailing List, linux-media

On Thu, May 23, 2019 at 6:22 PM <dongchun.zhu@mediatek.com> wrote:
>
> From: Dongchun Zhu <dongchun.zhu@mediatek.com>
>
> Add a V4L2 sub-device driver for the OmniVision image sensor.
> This is a camera sensor using the I2C bus for control and the
> CSI-2 bus for data.
>
> Signed-off-by: Dongchun Zhu <dongchun.zhu@mediatek.com>
> ---
>  drivers/media/i2c/Makefile  |    1 +
>  drivers/media/i2c/ov02a10.c | 1067 +++++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 1068 insertions(+)
>  create mode 100644 drivers/media/i2c/ov02a10.c
>
> diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
> index d8ad9da..4b8f67b 100644
> --- a/drivers/media/i2c/Makefile
> +++ b/drivers/media/i2c/Makefile
> @@ -63,6 +63,7 @@ obj-$(CONFIG_VIDEO_VP27SMPX) += vp27smpx.o
>  obj-$(CONFIG_VIDEO_SONY_BTF_MPX) += sony-btf-mpx.o
>  obj-$(CONFIG_VIDEO_UPD64031A) += upd64031a.o
>  obj-$(CONFIG_VIDEO_UPD64083) += upd64083.o
> +obj-$(CONFIG_VIDEO_OV02A10) += ov02a10.o
>  obj-$(CONFIG_VIDEO_OV2640) += ov2640.o
>  obj-$(CONFIG_VIDEO_OV2680) += ov2680.o
>  obj-$(CONFIG_VIDEO_OV2685) += ov2685.o
> diff --git a/drivers/media/i2c/ov02a10.c b/drivers/media/i2c/ov02a10.c
> new file mode 100644
> index 0000000..39472ff
> --- /dev/null
> +++ b/drivers/media/i2c/ov02a10.c
> @@ -0,0 +1,1067 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * A V4L2 driver for OmniVision OV02A10 cameras.
> + *
> + * Based on Omnivision OV02A10 Camera Driver
> + * Copyright (C) 2019 MediaTek Inc.
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation version 2.
> + *
> + * This program is distributed .as is. WITHOUT ANY WARRANTY of any
> + * kind, whether express or implied; without even the implied warranty
> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */

This is not needed, you already have the SPDX header

> +
> +#include <linux/clk.h>
> +#include <linux/device.h>
> +#include <linux/delay.h>
> +#include <linux/gpio/consumer.h>
> +#include <linux/i2c.h>
> +#include <linux/module.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/regulator/consumer.h>
> +#include <linux/sysfs.h>
> +#include <media/media-entity.h>
> +#include <media/v4l2-async.h>
> +#include <media/v4l2-ctrls.h>
> +#include <media/v4l2-subdev.h>
> +
> +#define CHIP_ID                                         0x2509
> +#define OV02A10_REG_CHIP_ID_H                           0x02
> +#define OV02A10_REG_CHIP_ID_L                           0x03
> +#define OV02A10_ID(_msb, _lsb)                          ((_msb) << 8 | (_lsb))
> +
> +/* bit[1] vertical upside down */
> +/* bit[0] horizontal mirror */
> +#define OV02A10_REG_UPDOWN_MIRROR                       0x3F
> +
> +/* enable mirror & flip global effective */
> +#define OV02A10_REG_UPDOWN_MIRROR_ENABLE                0x01

So according to comment above, this enables horizontal mirror only?

What about vertical upside down? Do we want to define a mask for that?

> +
> +#define ov02a10_XVCLK_FREQ                              24000000

Upper-case OV02A10_ prefix for all these macros.

> +#define REG_SC_CTRL_MODE                                0xac
> +
> +#define SC_CTRL_MODE_STANDBY                            0x00
> +#define SC_CTRL_MODE_STREAMING                          0x01
> +
> +#define ov02a10_REG_EXPOSURE_H                          0x03
> +#define ov02a10_REG_EXPOSURE_L                          0x04
> +#define        ov02a10_EXPOSURE_MIN                            4
> +#define        ov02a10_EXPOSURE_STEP                           1
> +
> +#define ov02a10_REG_VTS_H                               0x05
> +#define ov02a10_REG_VTS_L                               0x06
> +#define ov02a10_VTS_MAX                                 0x209f
> +#define ov02a10_VTS_MIN                                 0x04cf
> +
> +#define ov02a10_REG_GAIN                                0x24
> +#define ov02a10_GAIN_MIN                                0x10
> +#define ov02a10_GAIN_MAX                                0xf8
> +#define ov02a10_GAIN_STEP                               0x01
> +#define ov02a10_GAIN_DEFAULT                            0x40
> +
> +#define ov02a10_REG_TEST_PATTERN                        0x0d
> +#define ov02a10_TEST_PATTERN_DISABLED                   0x00
> +#define ov02a10_TEST_PATTERN_COLOR_BAR                  0x01
> +
> +#define REG_NULL                                        0xFF
> +
> +#define ov02a10_LANES                                   1
> +#define ov02a10_BITS_PER_SAMPLE                         10
> +
> +static const char * const ov02a10_supply_names[] = {
> +       "avdd",         /* Analog power */
> +       "dovdd",        /* Digital I/O power */
> +       "dvdd",         /* Digital core power */
> +};
> +
> +#define ov02a10_NUM_SUPPLIES ARRAY_SIZE(ov02a10_supply_names)
> +
> +struct regval {
> +       u16 addr;
> +       u8 val;
> +};
> +
> +struct ov02a10_mode {
> +       u32 width;
> +       u32 height;
> +       u32 exp_def;
> +       u32 hts_def;
> +       u32 vts_def;
> +       const struct regval *reg_list;
> +};
> +
> +struct ov02a10 {
> +       struct i2c_client       *client;
> +       struct clk              *xvclk;
> +       struct gpio_desc        *pwdn_gpio;
> +       struct gpio_desc        *reset_gpio;
> +       struct regulator_bulk_data supplies[ov02a10_NUM_SUPPLIES];
> +
> +       bool                    streaming;
> +       bool                    upside_down;
> +
> +       /*
> +        * Serialize control access, get/set format, get selection
> +        * and start streaming.
> +        */
> +       struct mutex            mutex;
> +       struct v4l2_subdev      subdev;
> +       struct media_pad        pad;
> +       struct v4l2_ctrl        *anal_gain;
> +       struct v4l2_ctrl        *exposure;
> +       struct v4l2_ctrl        *hblank;
> +       struct v4l2_ctrl        *vblank;
> +       struct v4l2_ctrl        *test_pattern;
> +       struct v4l2_ctrl_handler ctrl_handler;
> +
> +       const struct ov02a10_mode *cur_mode;
> +};
> +
> +#define to_ov02a10(sd) container_of(sd, struct ov02a10, subdev)
> +
> +/* test pattern output */
> +static struct regval ov02a10_test_pattern_regs[] = {

const

> +       {0xfd, 0x01},
> +       {0x0d, 0x00},
> +       {0xb6, 0x01},
> +       {0x01, 0x01},
> +       {0xfd, 0x01},
> +       {0xac, 0x01},
> +       {REG_NULL, 0x00}
> +};
> +
> +/*
> + * Xclk 24Mhz
> + * Pclk 39Mhz
> + * linelength 934(0x3a6)
> + * framelength 1390(0x56E)
> + * grabwindow_width 1600
> + * grabwindow_height 1200
> + * max_framerate 30fps
> + * mipi_datarate per lane 780Mbps
> + */
> +static struct regval ov02a10_1600x1200_regs[] = {

const

> +       {0xfd, 0x01},
> +       {0xac, 0x00},
> +       {0xfd, 0x00},
> +       {0x2f, 0x29},
> +       {0x34, 0x00},
> +       {0x35, 0x21},
> +       {0x30, 0x15},
> +       {0x33, 0x01},
> +       {0xfd, 0x01},
> +       {0x44, 0x00},
> +       {0x2a, 0x4c},
> +       {0x2b, 0x1e},
> +       {0x2c, 0x60},
> +       {0x25, 0x11},
> +       {0x03, 0x01},
> +       {0x04, 0xae},
> +       {0x09, 0x00},
> +       {0x0a, 0x02},
> +       {0x06, 0xa6},
> +       {0x31, 0x00},
> +       {0x24, 0x40},
> +       {0x01, 0x01},
> +       {0xfb, 0x73},
> +       {0xfd, 0x01},
> +       {0x16, 0x04},
> +       {0x1c, 0x09},
> +       {0x21, 0x42},
> +       {0x12, 0x04},
> +       {0x13, 0x10},
> +       {0x11, 0x40},
> +       {0x33, 0x81},
> +       {0xd0, 0x00},
> +       {0xd1, 0x01},
> +       {0xd2, 0x00},
> +       {0x50, 0x10},
> +       {0x51, 0x23},
> +       {0x52, 0x20},
> +       {0x53, 0x10},
> +       {0x54, 0x02},
> +       {0x55, 0x20},
> +       {0x56, 0x02},
> +       {0x58, 0x48},
> +       {0x5d, 0x15},
> +       {0x5e, 0x05},
> +       {0x66, 0x66},
> +       {0x68, 0x68},
> +       {0x6b, 0x00},
> +       {0x6c, 0x00},
> +       {0x6f, 0x40},
> +       {0x70, 0x40},
> +       {0x71, 0x0a},
> +       {0x72, 0xf0},
> +       {0x73, 0x10},
> +       {0x75, 0x80},
> +       {0x76, 0x10},
> +       {0x84, 0x00},
> +       {0x85, 0x10},
> +       {0x86, 0x10},
> +       {0x87, 0x00},
> +       {0x8a, 0x22},
> +       {0x8b, 0x22},
> +       {0x19, 0xf1},
> +       {0x29, 0x01},
> +       {0xfd, 0x01},
> +       {0x9d, 0x96},
> +       {0xa0, 0x29},
> +       {0xa1, 0x05},
> +       {0xad, 0x62},
> +       {0xae, 0x00},
> +       {0xaf, 0x85},
> +       {0xb1, 0x01},
> +       {0x8e, 0x06},
> +       {0x8f, 0x40},
> +       {0x90, 0x04},
> +       {0x91, 0xb0},
> +       {0x45, 0x01},
> +       {0x46, 0x00},
> +       {0x47, 0x6c},
> +       {0x48, 0x03},
> +       {0x49, 0x8b},
> +       {0x4a, 0x00},
> +       {0x4b, 0x07},
> +       {0x4c, 0x04},
> +       {0x4d, 0xb7},
> +       {0xf0, 0x40},
> +       {0xf1, 0x40},
> +       {0xf2, 0x40},
> +       {0xf3, 0x40},
> +       {0x3f, 0x00},
> +       {0xfd, 0x01},
> +       {0x05, 0x00},
> +       {0x06, 0xa6},
> +       {0xfd, 0x01},
> +       {REG_NULL, 0x00}
> +};
> +
> +#define ov02a10_LINK_FREQ_390MHZ               390000000
> +static const s64 link_freq_menu_items[] = {
> +       ov02a10_LINK_FREQ_390MHZ
> +};
> +
> +static const char * const ov02a10_test_pattern_menu[] = {
> +       "Disabled",
> +       "Color Bar",
> +};
> +
> +static const int ov02a10_test_pattern_val[] = {
> +       ov02a10_TEST_PATTERN_DISABLED,
> +       ov02a10_TEST_PATTERN_COLOR_BAR,
> +};
> +
> +static const struct ov02a10_mode supported_modes[] = {
> +       {
> +               .width = 1600,
> +               .height = 1200,
> +               .exp_def = 0x01ae,
> +               .hts_def = 0x03a6,
> +               .vts_def = 0x056e,
> +               .reg_list = ov02a10_1600x1200_regs,
> +       },
> +};
> +
> +/* write a register */
> +static int ov02a10_write_reg(struct i2c_client *client, u8 addr, u8 val)
> +{
> +       u8 buf[2] = { addr, val };
> +
> +       int ret = i2c_master_send(client, buf, 2);
> +
> +       if (ret < 0) {
> +               dev_err(&client->dev, "%s: error: reg=%x, val=%x\n",
> +                       __func__, addr, val);
> +               return ret;
> +       }
> +
> +       return ret == 2 ? 0 : ret;

You want to return a negative error value if ret == 1 or ret == 0...
(and maybe print an error message)

> +}
> +
> +static int ov02a10_write_array(struct i2c_client *client,
> +                              const struct regval *regs)
> +{
> +       int ret = 0;
> +       u32 i;
> +
> +       for (i = 0; ret == 0 && regs[i].addr != REG_NULL; i++) {

ret == 0 test is useless, you already abort the loop. Just drop it.

> +               ret = ov02a10_write_reg(client, regs[i].addr, regs[i].val);
> +               if (ret < 0)
> +                       return ret;
> +       }
> +
> +       return 0;
> +}
> +
> +/* read a register */
> +static int ov02a10_read_reg(struct i2c_client *client, u8 reg, u8 *val)
> +{
> +       int ret;
> +       u8 data = reg;
> +       struct i2c_msg msg = {
> +               .addr   = client->addr,
> +               .flags  = 0,
> +               .len    = 1,
> +               .buf    = &data,
> +       };
> +
> +       ret = i2c_transfer(client->adapter, &msg, 1);
> +       if (ret < 0) {
> +               dev_err(&client->dev, "i2c_transfer failed, ret %d\n", ret);
> +               goto err;
> +       }
> +
> +       msg.flags = I2C_M_RD;
> +       ret = i2c_transfer(client->adapter, &msg, 1);
> +       if (ret < 0) {
> +               dev_err(&client->dev, "i2c_transfer --I2C_M_RD failed, \
> +                       ret %d\n", ret);
> +               goto err;
> +       }
> +
> +       *val = data;
> +       return 0;
> +
> +err:
> +       dev_err(&client->dev, "Failed reading register 0x%02x!\n", reg);
> +       return ret;
> +}
> +
> +static void ov02a10_fill_fmt(const struct ov02a10_mode *mode,
> +                            struct v4l2_mbus_framefmt *fmt)
> +{
> +       fmt->code = MEDIA_BUS_FMT_SBGGR10_1X10;
> +       fmt->width = mode->width;
> +       fmt->height = mode->height;
> +       fmt->field = V4L2_FIELD_NONE;
> +}
> +
> +static int ov02a10_set_fmt(struct v4l2_subdev *sd,
> +                          struct v4l2_subdev_pad_config *cfg,
> +                          struct v4l2_subdev_format *fmt)
> +{
> +       struct ov02a10 *ov02a10 = to_ov02a10(sd);
> +       struct v4l2_mbus_framefmt *mbus_fmt = &fmt->format;
> +
> +       /* only one mode supported for now */
> +       ov02a10_fill_fmt(ov02a10->cur_mode, mbus_fmt);
> +
> +       return 0;
> +}
> +
> +static int ov02a10_get_fmt(struct v4l2_subdev *sd,
> +                          struct v4l2_subdev_pad_config *cfg,
> +                          struct v4l2_subdev_format *fmt)
> +{
> +       struct ov02a10 *ov02a10 = to_ov02a10(sd);
> +       struct v4l2_mbus_framefmt *mbus_fmt = &fmt->format;
> +
> +       ov02a10_fill_fmt(ov02a10->cur_mode, mbus_fmt);
> +
> +       return 0;
> +}
> +
> +static int ov02a10_enum_mbus_code(struct v4l2_subdev *sd,
> +                                 struct v4l2_subdev_pad_config *cfg,
> +                                 struct v4l2_subdev_mbus_code_enum *code)
> +{
> +       if (code->index >= ARRAY_SIZE(supported_modes))
> +               return -EINVAL;
> +
> +       code->code = MEDIA_BUS_FMT_SBGGR10_1X10;
> +
> +       return 0;
> +}
> +
> +static int ov02a10_enum_frame_sizes(struct v4l2_subdev *sd,
> +                                   struct v4l2_subdev_pad_config *cfg,
> +                                   struct v4l2_subdev_frame_size_enum *fse)
> +{
> +       int index = fse->index;

I'd just use fse->index below, simpler.

> +
> +       if (index >= ARRAY_SIZE(supported_modes))
> +               return -EINVAL;
> +
> +       fse->code = MEDIA_BUS_FMT_SBGGR10_1X10;
> +
> +       fse->min_width  = supported_modes[index].width;
> +       fse->max_width  = supported_modes[index].width;
> +       fse->max_height = supported_modes[index].height;
> +       fse->min_height = supported_modes[index].height;
> +
> +       return 0;
> +}
> +
> +static int __ov02a10_power_on(struct ov02a10 *ov02a10)
> +{
> +       int ret;
> +

Nit: No blank line here

> +       struct device *dev = &ov02a10->client->dev;
> +
> +       ret = clk_prepare_enable(ov02a10->xvclk);
> +       if (ret < 0) {
> +               dev_err(dev, "Failed to enable xvclk\n");
> +               return ret;
> +       }
> +
> +       /* note: set 0 is high, set 1 is low */
> +       gpiod_set_value_cansleep(ov02a10->reset_gpio, 1);
> +       gpiod_set_value_cansleep(ov02a10->pwdn_gpio, 0);
> +
> +       ret = regulator_bulk_enable(ov02a10_NUM_SUPPLIES, ov02a10->supplies);
> +       if (ret < 0) {
> +               dev_err(dev, "Failed to enable regulators\n");
> +               goto disable_clk;
> +       }
> +       usleep_range(7 * 1000, 8 * 1000);
> +
> +       gpiod_set_value_cansleep(ov02a10->pwdn_gpio, 1);
> +       usleep_range(10 * 1000, 12 * 1000);
> +
> +       gpiod_set_value_cansleep(ov02a10->reset_gpio, 0);
> +       usleep_range(10 * 1000, 12 * 1000);
> +
> +#ifdef SENSOR_HARDWARE_RESET

If we don't need this, please drop this code. Or remove the ifdef if we do.

> +       /* sensor hardware reset */
> +       gpiod_set_value_cansleep(ov02a10->reset_gpio, 1);
> +       usleep_range(10 * 1000, 12 * 1000);
> +       gpiod_set_value_cansleep(ov02a10->reset_gpio, 0);
> +       usleep_range(10 * 1000, 12 * 1000);
> +#endif
> +
> +       return 0;
> +
> +disable_clk:
> +       clk_disable_unprepare(ov02a10->xvclk);
> +
> +       return ret;
> +}
> +
> +static void __ov02a10_power_off(struct ov02a10 *ov02a10)
> +{
> +       clk_disable_unprepare(ov02a10->xvclk);
> +       gpiod_set_value_cansleep(ov02a10->reset_gpio, 1);
> +       gpiod_set_value_cansleep(ov02a10->pwdn_gpio, 1);
> +       regulator_bulk_disable(ov02a10_NUM_SUPPLIES, ov02a10->supplies);
> +}
> +
> +static int __ov02a10_start_stream(struct ov02a10 *ov02a10)
> +{
> +       int ret;
> +
> +       ret = ov02a10_write_array(ov02a10->client, ov02a10->cur_mode->reg_list);
> +       if (ret)
> +               return ret;
> +
> +       ret = __v4l2_ctrl_handler_setup(&ov02a10->ctrl_handler);
> +       if (ret) {
> +               pr_err("__v4l2_ctrl_handler_setup fail %d\n", ret);
> +               return ret;
> +       }
> +
> +       return ov02a10_write_reg(ov02a10->client,
> +                                REG_SC_CTRL_MODE, SC_CTRL_MODE_STREAMING);
> +}
> +
> +static int __ov02a10_stop_stream(struct ov02a10 *ov02a10)
> +{
> +       return ov02a10_write_reg(ov02a10->client,
> +                                REG_SC_CTRL_MODE, SC_CTRL_MODE_STANDBY);
> +}
> +
> +static int ov02a10_s_stream(struct v4l2_subdev *sd, int on)
> +{
> +       struct ov02a10 *ov02a10 = to_ov02a10(sd);
> +       struct i2c_client *client = ov02a10->client;
> +       int ret = 0;
> +
> +       pr_info("ov02a10 s_stream-(%d)\n", on);
> +       mutex_lock(&ov02a10->mutex);
> +
> +       if (ov02a10->streaming == !on) {

You can simplify a bit by doing this, and de-indent the rest of the code:
if (ov02a10->streaming == on)
    goto unlock_and_return;

> +               if (on) {
> +                       ret = pm_runtime_get_sync(&client->dev);
> +                       if (ret < 0) {
> +                               pm_runtime_put_noidle(&client->dev);
> +                               goto unlock_and_return;
> +                       }
> +
> +                       ret = __ov02a10_start_stream(ov02a10);
> +                       if (ret) {
> +                               v4l2_err(sd, "start stream failed while write regs\n");
> +                               pm_runtime_put(&client->dev);
> +                               goto unlock_and_return;
> +                       }
> +               } else {
> +                       __ov02a10_stop_stream(ov02a10);
> +                       pm_runtime_put(&client->dev);
> +               }
> +
> +               ov02a10->streaming = on;
> +       }
> +
> +unlock_and_return:
> +       mutex_unlock(&ov02a10->mutex);
> +
> +       return ret;
> +}
> +
> +#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
> +static int ov02a10_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
> +{
> +       struct ov02a10 *ov02a10 = to_ov02a10(sd);
> +       struct v4l2_mbus_framefmt *try_fmt;
> +
> +       mutex_lock(&ov02a10->mutex);
> +
> +       try_fmt = v4l2_subdev_get_try_format(sd, fh->pad, 0);
> +       /* Initialize try_fmt */
> +       ov02a10_fill_fmt(&supported_modes[0], try_fmt);
> +
> +       mutex_unlock(&ov02a10->mutex);
> +
> +       return 0;
> +}
> +#endif
> +
> +static int __maybe_unused ov02a10_runtime_resume(struct device *dev)
> +{
> +       struct i2c_client *client = to_i2c_client(dev);
> +       struct v4l2_subdev *sd = i2c_get_clientdata(client);
> +       struct ov02a10 *ov02a10 = to_ov02a10(sd);
> +
> +       return __ov02a10_power_on(ov02a10);
> +}
> +
> +static int __maybe_unused ov02a10_runtime_suspend(struct device *dev)
> +{
> +       struct i2c_client *client = to_i2c_client(dev);
> +       struct v4l2_subdev *sd = i2c_get_clientdata(client);
> +       struct ov02a10 *ov02a10 = to_ov02a10(sd);
> +
> +       if (ov02a10->streaming == 1) {

I'd drop the == 1.

> +               __ov02a10_stop_stream(ov02a10);
> +               ov02a10->streaming = 0;
> +       }
> +       __ov02a10_power_off(ov02a10);
> +
> +       return 0;
> +}
> +
> +static const struct dev_pm_ops ov02a10_pm_ops = {
> +       SET_RUNTIME_PM_OPS(ov02a10_runtime_suspend,
> +                          ov02a10_runtime_resume, NULL)
> +};
> +
> +static int ov02a10_mod_reg(struct ov02a10 *ov02a10, u16 reg,
> +                          u8 mask, u8 val)
> +{
> +       u8 read_val;
> +       int ret;
> +
> +       ret = ov02a10_read_reg(ov02a10->client, reg, &read_val);
> +       if (ret)
> +               return ret;
> +
> +       read_val &= ~mask;
> +       val &= mask;
> +       val |= read_val;
> +
> +       return ov02a10_write_reg(ov02a10->client, reg, val);
> +}

Move this function right after the read_reg/write_reg ones.

> +
> +/* mirror & flip reg setting effective */
> +static int ov02a10_bayer_order(struct ov02a10 *ov02a10)
> +{
> +       int ret;
> +
> +       ret = ov02a10_write_reg(ov02a10->client,
> +                               OV02A10_REG_UPDOWN_MIRROR_ENABLE,
> +                               SC_CTRL_MODE_STREAMING);
> +       if (ret < 0)
> +               return ret;
> +
> +       return 0;
> +}
> +
> +static int ov02a10_set_ctrl_hflip(struct ov02a10 *ov02a10, int value)
> +{
> +       /*
> +        * If sensor is mounted upside down, mirror logic is inversed.
> +        *
> +        * Sensor is a BSI (Back Side Illuminated) one,
> +        * so image captured is physically mirrored.
> +        * This is why mirror logic is inversed in
> +        * order to cancel this mirror effect.
> +        */
> +
> +       /*
> +        * P1: 0x3F:
> +        * - [1]:       Vertical upside down
> +        * - [0]:       Horizontal mirror
> +        */

This was already described above, please drop it.

> +
> +       int ret;
> +
> +       ret = ov02a10_mod_reg(ov02a10, OV02A10_REG_UPDOWN_MIRROR,
> +                             BIT(0),

Use OV02A10_REG_UPDOWN_MIRROR_ENABLE that you defined above.

> +                             (!(value ^ ov02a10->upside_down)) ?
> +                             BIT(0) : 0);
> +
> +       if (ret < 0)
> +               return ret;
> +
> +       return ov02a10_bayer_order(ov02a10);
> +}
> +
> +static int ov02a10_set_ctrl_vflip(struct ov02a10 *ov02a10, int value)
> +{
> +       /* If sensor is mounted upside down, flip logic is inversed */
> +
> +       /*
> +        * P1: 0x3F:
> +        * - [1]:       Vertical upside down
> +        * - [0]:       Horizontal mirror
> +        */

ditto

> +
> +       int ret;
> +
> +       ret = ov02a10_mod_reg(ov02a10, OV02A10_REG_UPDOWN_MIRROR,
> +                             BIT(1),

Please define a macro for this one.

> +                             (value ^ ov02a10->upside_down) ?
> +                             BIT(1) : 0);
> +
> +       if (ret < 0)
> +               return ret;
> +
> +       return ov02a10_bayer_order(ov02a10);
> +}
> +
> +static int ov02a10_set_test_pattern(struct ov02a10 *ov02a10, s32 value)
> +{
> +       int ret = 0;
> +
> +       if (value)
> +               return ov02a10_write_array(ov02a10->client,
> +                                          ov02a10_test_pattern_regs);
> +
> +       return ret;

Just return 0, and drop variable ret.

> +}
> +
> +static int ov02a10_set_ctrl(struct v4l2_ctrl *ctrl)
> +{
> +       struct ov02a10 *ov02a10 = container_of(ctrl->handler,
> +                                            struct ov02a10, ctrl_handler);
> +       struct i2c_client *client = ov02a10->client;
> +       s64 max_expo;
> +       int ret = 0;
> +
> +       /* Propagate change of current control to all related controls */
> +       switch (ctrl->id) {
> +       case V4L2_CID_VBLANK:

That looks like an if (ctrl->id == V4L2_CID_VBLANK)

> +               /* Update max exposure while meeting expected vblanking */
> +               max_expo = ov02a10->cur_mode->height + ctrl->val - 4;
> +               __v4l2_ctrl_modify_range(ov02a10->exposure,
> +                                        ov02a10->exposure->minimum, max_expo,
> +                                        ov02a10->exposure->step,
> +                                        ov02a10->exposure->default_value);
> +               break;
> +       }
> +
> +       if (pm_runtime_get_if_in_use(&client->dev) <= 0)
> +               return 0;
> +
> +       switch (ctrl->id) {
> +       case V4L2_CID_EXPOSURE:
> +               ret = ov02a10_write_reg(client, 0xfd, 0x01);

Please define register 0xfd, and bit 0. Same below with register 0x01.

> +               if (ret < 0)
> +                       return ret;
> +               ret = ov02a10_write_reg(client, ov02a10_REG_EXPOSURE_H,
> +                                       ((ctrl->val >> 8) & 0xFF));
> +               if (!ret) {
> +                       ret = ov02a10_write_reg(client, ov02a10_REG_EXPOSURE_L,
> +                                               (ctrl->val & 0xFF));
> +                       if (ret < 0)
> +                               return ret;
> +               }
> +               ret = ov02a10_write_reg(client, 0x01, 0x01);
> +               if (ret < 0)
> +                       return ret;
> +               break;
> +       case V4L2_CID_ANALOGUE_GAIN:
> +               ret = ov02a10_write_reg(client, 0xfd, 0x01);
> +               if (ret < 0)
> +                       return ret;
> +               ret = ov02a10_write_reg(client, ov02a10_REG_GAIN,
> +                                       (ctrl->val & 0xFF));
> +               if (ret < 0)
> +                       return ret;
> +               ret = ov02a10_write_reg(client, 0x01, 0x01);
> +               if (ret < 0)
> +                       return ret;
> +               break;
> +       case V4L2_CID_VBLANK:
> +               ret = ov02a10_write_reg(client, 0xfd, 0x01);
> +               if (ret < 0)
> +                       return ret;
> +               ret = ov02a10_write_reg(client, ov02a10_REG_VTS_H,
> +                                       (((ctrl->val +
> +                                       ov02a10->cur_mode->height - 1224) >> 8)
> +                                       & 0xFF));
> +               if (!ret) {
> +                       ret = ov02a10_write_reg(client, ov02a10_REG_VTS_L,
> +                                               ((ctrl->val +
> +                                               ov02a10->cur_mode->height -
> +                                               1224) & 0xFF));
> +                       if (ret < 0)
> +                               return ret;
> +               }
> +               ret = ov02a10_write_reg(client, 0x01, 0x01);
> +               if (ret < 0)
> +                       return ret;
> +               break;
> +       case V4L2_CID_TEST_PATTERN:
> +               ret =
> +                ov02a10_set_test_pattern(ov02a10,
> +                                         ov02a10_test_pattern_val[ctrl->val]);
> +               break;
> +       case V4L2_CID_HFLIP:
> +               if (ov02a10->streaming)
> +                       return -EBUSY;
> +               if (ctrl->val)

Why? Don't we want to reset the flip if V4L2_CID_HFLIP is called with val 0?

> +                       ret = ov02a10_set_ctrl_hflip(ov02a10, ctrl->val);
> +               break;
> +       case V4L2_CID_VFLIP:
> +               if (ov02a10->streaming)
> +                       return -EBUSY;
> +               if (ctrl->val)

ditto

> +                       ret = ov02a10_set_ctrl_vflip(ov02a10, ctrl->val);
> +               break;
> +       default:
> +               dev_warn(&client->dev, "%s Unhandled id:0x%x, val:0x%x\n",
> +                        __func__, ctrl->id, ctrl->val);
> +               ret = -EINVAL;
> +               break;
> +       };
> +
> +       pm_runtime_put(&client->dev);
> +
> +       return ret;
> +}
> +
> +static const struct v4l2_subdev_video_ops ov02a10_video_ops = {
> +       .s_stream = ov02a10_s_stream,
> +};
> +
> +static const struct v4l2_subdev_pad_ops ov02a10_pad_ops = {
> +       .enum_mbus_code = ov02a10_enum_mbus_code,
> +       .enum_frame_size = ov02a10_enum_frame_sizes,
> +       .get_fmt = ov02a10_get_fmt,
> +       .set_fmt = ov02a10_set_fmt,
> +};
> +
> +static const struct v4l2_subdev_ops ov02a10_subdev_ops = {
> +       .video  = &ov02a10_video_ops,
> +       .pad    = &ov02a10_pad_ops,
> +};
> +
> +#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
> +static const struct v4l2_subdev_internal_ops ov02a10_internal_ops = {
> +       .open = ov02a10_open,
> +};
> +#endif
> +
> +static const struct v4l2_ctrl_ops ov02a10_ctrl_ops = {
> +       .s_ctrl = ov02a10_set_ctrl,
> +};
> +
> +static int ov02a10_initialize_controls(struct ov02a10 *ov02a10)
> +{
> +       const struct ov02a10_mode *mode;
> +       struct v4l2_ctrl_handler *handler;
> +       struct v4l2_ctrl *ctrl;
> +       u64 exposure_max;
> +       u32 pixel_rate, h_blank;
> +       int ret;
> +
> +       handler = &ov02a10->ctrl_handler;
> +       mode = ov02a10->cur_mode;
> +       ret = v4l2_ctrl_handler_init(handler, 8);
> +       if (ret)
> +               return ret;
> +       handler->lock = &ov02a10->mutex;
> +
> +       ctrl = v4l2_ctrl_new_int_menu(handler, NULL, V4L2_CID_LINK_FREQ,
> +                                     0, 0, link_freq_menu_items);
> +       if (ctrl)
> +               ctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY;
> +
> +       pixel_rate = (link_freq_menu_items[0] * 2 * ov02a10_LANES) /
> +                    ov02a10_BITS_PER_SAMPLE;
> +       v4l2_ctrl_new_std(handler, NULL, V4L2_CID_PIXEL_RATE,
> +                         0, pixel_rate, 1, pixel_rate);
> +
> +       h_blank = mode->hts_def - mode->width;
> +       ov02a10->hblank = v4l2_ctrl_new_std(handler, NULL, V4L2_CID_HBLANK,
> +                                           h_blank, h_blank, 1, h_blank);
> +       if (ov02a10->hblank)
> +               ov02a10->hblank->flags |= V4L2_CTRL_FLAG_READ_ONLY;
> +
> +       ov02a10->vblank = v4l2_ctrl_new_std(handler, &ov02a10_ctrl_ops,
> +                                           V4L2_CID_VBLANK, mode->vts_def -
> +                                           mode->height,
> +                                           ov02a10_VTS_MAX - mode->height, 1,
> +                                           mode->vts_def - mode->height);
> +
> +       exposure_max = mode->vts_def - 4;
> +       ov02a10->exposure = v4l2_ctrl_new_std(handler, &ov02a10_ctrl_ops,
> +                                             V4L2_CID_EXPOSURE,
> +                                             ov02a10_EXPOSURE_MIN,
> +                                             exposure_max,
> +                                             ov02a10_EXPOSURE_STEP,
> +                                             mode->exp_def);
> +
> +       ov02a10->anal_gain = v4l2_ctrl_new_std(handler, &ov02a10_ctrl_ops,
> +                                              V4L2_CID_ANALOGUE_GAIN,
> +                                              ov02a10_GAIN_MIN,
> +                                              ov02a10_GAIN_MAX,
> +                                              ov02a10_GAIN_STEP,
> +                                              ov02a10_GAIN_DEFAULT);
> +
> +       ov02a10->test_pattern =
> +          v4l2_ctrl_new_std_menu_items(handler,
> +                                       &ov02a10_ctrl_ops,
> +                                       V4L2_CID_TEST_PATTERN,
> +                                       ARRAY_SIZE(ov02a10_test_pattern_menu) -
> +                                       1, 0, 0, ov02a10_test_pattern_menu);
> +
> +       if (handler->error) {
> +               ret = handler->error;
> +               dev_err(&ov02a10->client->dev,
> +                       "Failed to init controls(%d)\n", ret);
> +               goto err_free_handler;
> +       }
> +
> +       ov02a10->subdev.ctrl_handler = handler;
> +
> +       return 0;
> +
> +err_free_handler:
> +       v4l2_ctrl_handler_free(handler);
> +
> +       return ret;
> +}
> +
> +static int ov02a10_check_sensor_id(struct ov02a10 *ov02a10,
> +                                  struct i2c_client *client)
> +{
> +       struct device *dev = &ov02a10->client->dev;
> +       u8 pid = 0;
> +       u8 ver = 0;
> +       int ret;
> +
> +       /* Check sensor revision */
> +       ret = ov02a10_read_reg(client, OV02A10_REG_CHIP_ID_H, &pid);
> +       if (!ret)

I'd change the error handling all over this function.

if (ret)
   return 0;

> +               ret = ov02a10_read_reg(client, OV02A10_REG_CHIP_ID_L, &ver);
> +
> +       if (!ret) {

if (ret)
    return 0;

> +               unsigned short id;
> +
> +               id = OV02A10_ID(pid, ver);
> +               dev_info(dev, "ov02a10_sensor id(%04x)\n", id);

Drop this line, no need to print the id twice.

> +               if (id != CHIP_ID) {
> +                       dev_err(dev, "Unexpected sensor id(%04x), ret(%d)\n",
> +                               id, ret);

ret always == 0 here, no need to print it.

> +                       return ret;
> +               }
> +               dev_info(dev, "Detected OV%04X sensor\n", id);
> +       }
> +
> +       return 0;
> +}
> +
> +static int ov02a10_configure_regulators(struct ov02a10 *ov02a10)
> +{
> +       int i;
> +
> +       for (i = 0; i < ov02a10_NUM_SUPPLIES; i++)
> +               ov02a10->supplies[i].supply = ov02a10_supply_names[i];
> +
> +       return devm_regulator_bulk_get(&ov02a10->client->dev,
> +                                      ov02a10_NUM_SUPPLIES,
> +                                      ov02a10->supplies);
> +}
> +
> +static int ov02a10_probe(struct i2c_client *client,
> +                        const struct i2c_device_id *id)
> +{
> +       struct device *dev = &client->dev;
> +       struct ov02a10 *ov02a10;
> +       u32 rotation;
> +       int ret;
> +
> +       dev_info(dev, "ov02a10 probe ++\n");

Drop this

> +       ov02a10 = devm_kzalloc(dev, sizeof(*ov02a10), GFP_KERNEL);
> +       if (!ov02a10)
> +               return -ENOMEM;
> +
> +       ov02a10->client = client;
> +       ov02a10->cur_mode = &supported_modes[0];
> +
> +       /* optional indication of physical rotation of sensor */
> +       ret = fwnode_property_read_u32(dev_fwnode(dev), "rotation",
> +                                      &rotation);
> +       if (!ret) {
> +               switch (rotation) {
> +               case 180:
> +                       ov02a10->upside_down = true;
> +                       /* fall through */

Just break here.

> +               case 0:
> +                       break;
> +               default:
> +                       dev_warn(dev, "%u degrees rotation is not supported, ignoring...\n",
> +                                rotation);
> +               }
> +       }
> +
> +       ov02a10->xvclk = devm_clk_get(dev, "xvclk");
> +       if (IS_ERR(ov02a10->xvclk)) {
> +               dev_err(dev, "Failed to get xvclk\n");
> +               return -EINVAL;
> +       }
> +       ret = clk_set_rate(ov02a10->xvclk, ov02a10_XVCLK_FREQ);
> +       if (ret < 0) {
> +               dev_err(dev, "Failed to set xvclk rate (24MHz)\n");
> +               return ret;
> +       }
> +       if (clk_get_rate(ov02a10->xvclk) != ov02a10_XVCLK_FREQ)
> +               dev_warn(dev, "xvclk mismatched, modes are based on 24MHz\n");
> +
> +       ov02a10->pwdn_gpio = devm_gpiod_get(dev, "pwdn", GPIOD_OUT_LOW);
> +       if (IS_ERR(ov02a10->pwdn_gpio)) {
> +               dev_err(dev, "Failed to get powerdown-gpios\n");
> +               return -EINVAL;
> +       }
> +
> +       ov02a10->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
> +       if (IS_ERR(ov02a10->reset_gpio)) {
> +               dev_err(dev, "Failed to get reset-gpios\n");
> +               return -EINVAL;
> +       }
> +
> +       ret = ov02a10_configure_regulators(ov02a10);
> +       if (ret) {
> +               dev_err(dev, "Failed to get power regulators\n");
> +               return ret;
> +       }
> +
> +       mutex_init(&ov02a10->mutex);
> +       v4l2_i2c_subdev_init(&ov02a10->subdev, client, &ov02a10_subdev_ops);
> +       ret = ov02a10_initialize_controls(ov02a10);
> +       if (ret) {
> +               dev_err(dev, "Failed to initialize controls\n");
> +               goto err_destroy_mutex;
> +       }
> +
> +       ret = __ov02a10_power_on(ov02a10);
> +       if (ret) {
> +               dev_err(dev, "Failed to power on\n");

No need to print an error message, __ov02a10_power_on already does it.

> +               goto err_free_handler;
> +       }
> +
> +       ret = ov02a10_check_sensor_id(ov02a10, client);
> +       if (ret) {
> +               dev_err(dev, "Failed to detect id, go to power off\n");

No need to print an error message here, check_sensor_id already does it.

> +               goto err_power_off;
> +       }
> +
> +#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
> +       ov02a10->subdev.internal_ops = &ov02a10_internal_ops;
> +       ov02a10->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
> +#endif
> +#if defined(CONFIG_MEDIA_CONTROLLER)
> +       ov02a10->pad.flags = MEDIA_PAD_FL_SOURCE;
> +       ov02a10->subdev.entity.function = MEDIA_ENT_F_CAM_SENSOR;
> +       ret = media_entity_pads_init(&ov02a10->subdev.entity, 1, &ov02a10->pad);
> +       if (ret < 0) {
> +               dev_err(dev, "Failed init pads\n");
> +               goto err_power_off;
> +       }
> +#endif
> +
> +       ret = v4l2_async_register_subdev(&ov02a10->subdev);
> +       if (ret) {
> +               dev_err(dev, "v4l2 async register subdev failed\n");
> +               goto err_clean_entity;
> +       }
> +
> +       pm_runtime_set_active(dev);
> +       pm_runtime_enable(dev);
> +       pm_runtime_idle(dev);
> +       dev_info(dev, "ov02a10 probe --\n");

Drop this.

> +
> +       return 0;
> +
> +err_clean_entity:
> +#if defined(CONFIG_MEDIA_CONTROLLER)
> +       media_entity_cleanup(&ov02a10->subdev.entity);
> +#endif
> +err_power_off:
> +       __ov02a10_power_off(ov02a10);
> +err_free_handler:
> +       v4l2_ctrl_handler_free(&ov02a10->ctrl_handler);
> +err_destroy_mutex:
> +       mutex_destroy(&ov02a10->mutex);
> +
> +       return ret;
> +}
> +
> +static int ov02a10_remove(struct i2c_client *client)
> +{
> +       struct v4l2_subdev *sd = i2c_get_clientdata(client);
> +       struct ov02a10 *ov02a10 = to_ov02a10(sd);
> +
> +       v4l2_async_unregister_subdev(sd);
> +#if defined(CONFIG_MEDIA_CONTROLLER)
> +       media_entity_cleanup(&sd->entity);
> +#endif
> +       v4l2_ctrl_handler_free(&ov02a10->ctrl_handler);
> +       mutex_destroy(&ov02a10->mutex);
> +
> +       pm_runtime_disable(&client->dev);
> +       if (!pm_runtime_status_suspended(&client->dev))
> +               __ov02a10_power_off(ov02a10);
> +       pm_runtime_set_suspended(&client->dev);
> +
> +       return 0;
> +}
> +
> +#if IS_ENABLED(CONFIG_OF)
> +static const struct of_device_id ov02a10_of_match[] = {
> +       { .compatible = "ovti,ov02a10" },
> +       {},
> +};
> +MODULE_DEVICE_TABLE(of, ov02a10_of_match);
> +#endif
> +
> +static struct i2c_driver ov02a10_i2c_driver = {
> +       .driver = {
> +               .name = "ov02a10",
> +               .pm = &ov02a10_pm_ops,
> +               .of_match_table = of_match_ptr(ov02a10_of_match),
> +       },
> +       .probe          = &ov02a10_probe,
> +       .remove         = &ov02a10_remove,
> +};
> +
> +module_i2c_driver(ov02a10_i2c_driver);
> +
> +MODULE_AUTHOR("Dongchun Zhu <dongchun.zhu@mediatek.com>");
> +MODULE_DESCRIPTION("OmniVision OV02A10 sensor driver");
> +MODULE_LICENSE("GPL v2");
> --
> 2.9.2
>
>
> _______________________________________________
> Linux-mediatek mailing list
> Linux-mediatek@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-mediatek

^ permalink raw reply	[flat|nested] 14+ messages in thread

* Re: [PATCH 1/3] media: i2c: ov02a10: Add ov02a10 camera sensor driver
  2019-05-23 10:22 ` [PATCH 1/3] media: i2c: ov02a10: Add ov02a10 camera " dongchun.zhu
  2019-05-26  8:53   ` Nicolas Boichat
@ 2019-05-28  6:20   ` Bingbu Cao
  2019-06-13  3:22     ` Dongchun Zhu
  2019-05-31 17:03   ` Sakari Ailus
  2 siblings, 1 reply; 14+ messages in thread
From: Bingbu Cao @ 2019-05-28  6:20 UTC (permalink / raw)
  To: dongchun.zhu, mchehab, robh+dt, mark.rutland, matthias.bgg, bingbu.cao
  Cc: srv_heupstream, linux-mediatek, linux-arm-kernel, sj.huang,
	linux-media, devicetree, louis.kuo, menghui.lin, shengnan.wang



On 5/23/19 6:22 PM, dongchun.zhu@mediatek.com wrote:
> From: Dongchun Zhu <dongchun.zhu@mediatek.com>
> 
> Add a V4L2 sub-device driver for the OmniVision image sensor.
> This is a camera sensor using the I2C bus for control and the
> CSI-2 bus for data.
> 
> Signed-off-by: Dongchun Zhu <dongchun.zhu@mediatek.com>
> ---
>  drivers/media/i2c/Makefile  |    1 +
>  drivers/media/i2c/ov02a10.c | 1067 +++++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 1068 insertions(+)
>  create mode 100644 drivers/media/i2c/ov02a10.c
> 
> diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
> index d8ad9da..4b8f67b 100644
> --- a/drivers/media/i2c/Makefile
> +++ b/drivers/media/i2c/Makefile
> @@ -63,6 +63,7 @@ obj-$(CONFIG_VIDEO_VP27SMPX) += vp27smpx.o
>  obj-$(CONFIG_VIDEO_SONY_BTF_MPX) += sony-btf-mpx.o
>  obj-$(CONFIG_VIDEO_UPD64031A) += upd64031a.o
>  obj-$(CONFIG_VIDEO_UPD64083) += upd64083.o
> +obj-$(CONFIG_VIDEO_OV02A10) += ov02a10.o
>  obj-$(CONFIG_VIDEO_OV2640) += ov2640.o
>  obj-$(CONFIG_VIDEO_OV2680) += ov2680.o
>  obj-$(CONFIG_VIDEO_OV2685) += ov2685.o
> diff --git a/drivers/media/i2c/ov02a10.c b/drivers/media/i2c/ov02a10.c
> new file mode 100644
> index 0000000..39472ff
> --- /dev/null
> +++ b/drivers/media/i2c/ov02a10.c
> @@ -0,0 +1,1067 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * A V4L2 driver for OmniVision OV02A10 cameras.
> + *
> + * Based on Omnivision OV02A10 Camera Driver
> + * Copyright (C) 2019 MediaTek Inc.
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation version 2.
> + *
> + * This program is distributed .as is. WITHOUT ANY WARRANTY of any
> + * kind, whether express or implied; without even the implied warranty
> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/device.h>
> +#include <linux/delay.h>
> +#include <linux/gpio/consumer.h>
> +#include <linux/i2c.h>
> +#include <linux/module.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/regulator/consumer.h>
> +#include <linux/sysfs.h>
> +#include <media/media-entity.h>
> +#include <media/v4l2-async.h>
> +#include <media/v4l2-ctrls.h>
> +#include <media/v4l2-subdev.h>
> +
> +#define CHIP_ID                                         0x2509
> +#define OV02A10_REG_CHIP_ID_H                           0x02
> +#define OV02A10_REG_CHIP_ID_L                           0x03
> +#define OV02A10_ID(_msb, _lsb)                          ((_msb) << 8 | (_lsb))
> +
> +/* bit[1] vertical upside down */
> +/* bit[0] horizontal mirror */
> +#define OV02A10_REG_UPDOWN_MIRROR                       0x3F
> +
> +/* enable mirror & flip global effective */
> +#define OV02A10_REG_UPDOWN_MIRROR_ENABLE                0x01
> +
> +#define ov02a10_XVCLK_FREQ                              24000000
> +#define REG_SC_CTRL_MODE                                0xac
> +
> +#define SC_CTRL_MODE_STANDBY                            0x00
> +#define SC_CTRL_MODE_STREAMING                          0x01
> +
> +#define ov02a10_REG_EXPOSURE_H                          0x03
> +#define ov02a10_REG_EXPOSURE_L                          0x04
> +#define	ov02a10_EXPOSURE_MIN                            4
> +#define	ov02a10_EXPOSURE_STEP                           1
> +
> +#define ov02a10_REG_VTS_H                               0x05
> +#define ov02a10_REG_VTS_L                               0x06
> +#define ov02a10_VTS_MAX                                 0x209f
> +#define ov02a10_VTS_MIN                                 0x04cf
> +
> +#define ov02a10_REG_GAIN                                0x24
> +#define ov02a10_GAIN_MIN                                0x10
> +#define ov02a10_GAIN_MAX                                0xf8
> +#define ov02a10_GAIN_STEP                               0x01
> +#define ov02a10_GAIN_DEFAULT                            0x40
> +
> +#define ov02a10_REG_TEST_PATTERN                        0x0d
> +#define ov02a10_TEST_PATTERN_DISABLED                   0x00
> +#define ov02a10_TEST_PATTERN_COLOR_BAR                  0x01
> +
> +#define REG_NULL                                        0xFF
> +
> +#define ov02a10_LANES                                   1
> +#define ov02a10_BITS_PER_SAMPLE                         10

I prefer using capital letters in macro.

> +
> +static const char * const ov02a10_supply_names[] = {
> +	"avdd",		/* Analog power */
> +	"dovdd",	/* Digital I/O power */
> +	"dvdd",		/* Digital core power */
> +};
> +
> +#define ov02a10_NUM_SUPPLIES ARRAY_SIZE(ov02a10_supply_names)
> +
> +struct regval {
> +	u16 addr;
> +	u8 val;
> +};
> +
> +struct ov02a10_mode {
> +	u32 width;
> +	u32 height;
> +	u32 exp_def;
> +	u32 hts_def;
> +	u32 vts_def;
> +	const struct regval *reg_list;
> +};
> +
> +struct ov02a10 {
> +	struct i2c_client	*client;
> +	struct clk		*xvclk;
> +	struct gpio_desc	*pwdn_gpio;
> +	struct gpio_desc	*reset_gpio;
> +	struct regulator_bulk_data supplies[ov02a10_NUM_SUPPLIES];
> +
> +	bool			streaming;
> +	bool			upside_down;
> +
> +	/*
> +	 * Serialize control access, get/set format, get selection
> +	 * and start streaming.
> +	 */
> +	struct mutex		mutex;
> +	struct v4l2_subdev	subdev;
> +	struct media_pad	pad;
> +	struct v4l2_ctrl	*anal_gain;
> +	struct v4l2_ctrl	*exposure;
> +	struct v4l2_ctrl	*hblank;
> +	struct v4l2_ctrl	*vblank;
> +	struct v4l2_ctrl	*test_pattern;
> +	struct v4l2_ctrl_handler ctrl_handler;
> +
> +	const struct ov02a10_mode *cur_mode;
> +};
> +
> +#define to_ov02a10(sd) container_of(sd, struct ov02a10, subdev)
> +
> +/* test pattern output */
> +static struct regval ov02a10_test_pattern_regs[] = {
> +	{0xfd, 0x01},
> +	{0x0d, 0x00},
> +	{0xb6, 0x01},
> +	{0x01, 0x01},
> +	{0xfd, 0x01},
> +	{0xac, 0x01},
> +	{REG_NULL, 0x00}
> +};
> +
> +/*
> + * Xclk 24Mhz
> + * Pclk 39Mhz
> + * linelength 934(0x3a6)
> + * framelength 1390(0x56E)
> + * grabwindow_width 1600
> + * grabwindow_height 1200
> + * max_framerate 30fps
> + * mipi_datarate per lane 780Mbps
> + */
> +static struct regval ov02a10_1600x1200_regs[] = {
> +	{0xfd, 0x01},
> +	{0xac, 0x00},
> +	{0xfd, 0x00},
> +	{0x2f, 0x29},
> +	{0x34, 0x00},
> +	{0x35, 0x21},
> +	{0x30, 0x15},
> +	{0x33, 0x01},
> +	{0xfd, 0x01},
> +	{0x44, 0x00},
> +	{0x2a, 0x4c},
> +	{0x2b, 0x1e},
> +	{0x2c, 0x60},
> +	{0x25, 0x11},
> +	{0x03, 0x01},
> +	{0x04, 0xae},
> +	{0x09, 0x00},
> +	{0x0a, 0x02},
> +	{0x06, 0xa6},
> +	{0x31, 0x00},
> +	{0x24, 0x40},
> +	{0x01, 0x01},
> +	{0xfb, 0x73},
> +	{0xfd, 0x01},
> +	{0x16, 0x04},
> +	{0x1c, 0x09},
> +	{0x21, 0x42},
> +	{0x12, 0x04},
> +	{0x13, 0x10},
> +	{0x11, 0x40},
> +	{0x33, 0x81},
> +	{0xd0, 0x00},
> +	{0xd1, 0x01},
> +	{0xd2, 0x00},
> +	{0x50, 0x10},
> +	{0x51, 0x23},
> +	{0x52, 0x20},
> +	{0x53, 0x10},
> +	{0x54, 0x02},
> +	{0x55, 0x20},
> +	{0x56, 0x02},
> +	{0x58, 0x48},
> +	{0x5d, 0x15},
> +	{0x5e, 0x05},
> +	{0x66, 0x66},
> +	{0x68, 0x68},
> +	{0x6b, 0x00},
> +	{0x6c, 0x00},
> +	{0x6f, 0x40},
> +	{0x70, 0x40},
> +	{0x71, 0x0a},
> +	{0x72, 0xf0},
> +	{0x73, 0x10},
> +	{0x75, 0x80},
> +	{0x76, 0x10},
> +	{0x84, 0x00},
> +	{0x85, 0x10},
> +	{0x86, 0x10},
> +	{0x87, 0x00},
> +	{0x8a, 0x22},
> +	{0x8b, 0x22},
> +	{0x19, 0xf1},
> +	{0x29, 0x01},
> +	{0xfd, 0x01},
> +	{0x9d, 0x96},
> +	{0xa0, 0x29},
> +	{0xa1, 0x05},
> +	{0xad, 0x62},
> +	{0xae, 0x00},
> +	{0xaf, 0x85},
> +	{0xb1, 0x01},
> +	{0x8e, 0x06},
> +	{0x8f, 0x40},
> +	{0x90, 0x04},
> +	{0x91, 0xb0},
> +	{0x45, 0x01},
> +	{0x46, 0x00},
> +	{0x47, 0x6c},
> +	{0x48, 0x03},
> +	{0x49, 0x8b},
> +	{0x4a, 0x00},
> +	{0x4b, 0x07},
> +	{0x4c, 0x04},
> +	{0x4d, 0xb7},
> +	{0xf0, 0x40},
> +	{0xf1, 0x40},
> +	{0xf2, 0x40},
> +	{0xf3, 0x40},
> +	{0x3f, 0x00},
> +	{0xfd, 0x01},
> +	{0x05, 0x00},
> +	{0x06, 0xa6},
> +	{0xfd, 0x01},
> +	{REG_NULL, 0x00}
> +};
> +
> +#define ov02a10_LINK_FREQ_390MHZ		390000000
How about OV02A10_LINK_FREQ_390MHZ?

> +static const s64 link_freq_menu_items[] = {
> +	ov02a10_LINK_FREQ_390MHZ
> +};
> +
> +static const char * const ov02a10_test_pattern_menu[] = {
> +	"Disabled",
> +	"Color Bar",
> +};
> +
> +static const int ov02a10_test_pattern_val[] = {
> +	ov02a10_TEST_PATTERN_DISABLED,
> +	ov02a10_TEST_PATTERN_COLOR_BAR,
> +};
This array is not needed, as the index align with the actual pattern value.
> +
> +static const struct ov02a10_mode supported_modes[] = {
> +	{
> +		.width = 1600,
> +		.height = 1200,
> +		.exp_def = 0x01ae,
> +		.hts_def = 0x03a6,
> +		.vts_def = 0x056e,
> +		.reg_list = ov02a10_1600x1200_regs,
> +	},
> +};
> +
> +/* write a register */
> +static int ov02a10_write_reg(struct i2c_client *client, u8 addr, u8 val)
> +{
> +	u8 buf[2] = { addr, val };
remove extra space
> +
> +	int ret = i2c_master_send(client, buf, 2);
> +
> +	if (ret < 0) {
> +		dev_err(&client->dev, "%s: error: reg=%x, val=%x\n",
> +			__func__, addr, val);
> +		return ret;
> +	}
> +
> +	return ret == 2 ? 0 : ret;
I think it is better to return an error code instead of ret for fail case.
> +}
> +
> +static int ov02a10_write_array(struct i2c_client *client,
> +			       const struct regval *regs)
> +{
> +	int ret = 0;
> +	u32 i;
> +
> +	for (i = 0; ret == 0 && regs[i].addr != REG_NULL; i++) {
> +		ret = ov02a10_write_reg(client, regs[i].addr, regs[i].val);
> +		if (ret < 0)
> +			return ret;
As no error message here and above, no any error message post for fail case.
> +	}
> +
> +	return 0;
> +}
> +
> +/* read a register */
> +static int ov02a10_read_reg(struct i2c_client *client, u8 reg, u8 *val)
> +{
> +	int ret;
> +	u8 data = reg;
> +	struct i2c_msg msg = {
> +		.addr	= client->addr,
> +		.flags	= 0,
> +		.len	= 1,
> +		.buf	= &data,
> +	};
> +
> +	ret = i2c_transfer(client->adapter, &msg, 1);
> +	if (ret < 0) {
> +		dev_err(&client->dev, "i2c_transfer failed, ret %d\n", ret);
> +		goto err;
> +	}
> +
> +	msg.flags = I2C_M_RD;
> +	ret = i2c_transfer(client->adapter, &msg, 1);
> +	if (ret < 0) {
> +		dev_err(&client->dev, "i2c_transfer --I2C_M_RD failed, \
> +			ret %d\n", ret);
Is it better squash this error message into goto?
> +		goto err;
> +	}
> +
> +	*val = data;
> +	return 0;
> +
> +err:
> +	dev_err(&client->dev, "Failed reading register 0x%02x!\n", reg);
> +	return ret;
> +}
> +
> +static void ov02a10_fill_fmt(const struct ov02a10_mode *mode,
> +			     struct v4l2_mbus_framefmt *fmt)
> +{
> +	fmt->code = MEDIA_BUS_FMT_SBGGR10_1X10;
> +	fmt->width = mode->width;
> +	fmt->height = mode->height;
> +	fmt->field = V4L2_FIELD_NONE;
> +}
> +
> +static int ov02a10_set_fmt(struct v4l2_subdev *sd,
> +			   struct v4l2_subdev_pad_config *cfg,
> +			   struct v4l2_subdev_format *fmt)
> +{
> +	struct ov02a10 *ov02a10 = to_ov02a10(sd);
> +	struct v4l2_mbus_framefmt *mbus_fmt = &fmt->format;
> +
> +	/* only one mode supported for now */
> +	ov02a10_fill_fmt(ov02a10->cur_mode, mbus_fmt);
> +
> +	return 0;
> +}
> +
> +static int ov02a10_get_fmt(struct v4l2_subdev *sd,
> +			   struct v4l2_subdev_pad_config *cfg,
> +			   struct v4l2_subdev_format *fmt)
> +{
> +	struct ov02a10 *ov02a10 = to_ov02a10(sd);
> +	struct v4l2_mbus_framefmt *mbus_fmt = &fmt->format;
> +
> +	ov02a10_fill_fmt(ov02a10->cur_mode, mbus_fmt);
> +
> +	return 0;
> +}
> +
> +static int ov02a10_enum_mbus_code(struct v4l2_subdev *sd,
> +				  struct v4l2_subdev_pad_config *cfg,
> +				  struct v4l2_subdev_mbus_code_enum *code)
> +{
> +	if (code->index >= ARRAY_SIZE(supported_modes))
> +		return -EINVAL;
> +
> +	code->code = MEDIA_BUS_FMT_SBGGR10_1X10;
> +
> +	return 0;
> +}
> +
> +static int ov02a10_enum_frame_sizes(struct v4l2_subdev *sd,
> +				    struct v4l2_subdev_pad_config *cfg,
> +				    struct v4l2_subdev_frame_size_enum *fse)
> +{
> +	int index = fse->index;
> +
> +	if (index >= ARRAY_SIZE(supported_modes))
> +		return -EINVAL;
> +
> +	fse->code = MEDIA_BUS_FMT_SBGGR10_1X10;
> +
> +	fse->min_width  = supported_modes[index].width;
> +	fse->max_width  = supported_modes[index].width;
> +	fse->max_height = supported_modes[index].height;
> +	fse->min_height = supported_modes[index].height;
> +
> +	return 0;
> +}
> +
> +static int __ov02a10_power_on(struct ov02a10 *ov02a10)
> +{
> +	int ret;
> +
> +	struct device *dev = &ov02a10->client->dev;
> +
> +	ret = clk_prepare_enable(ov02a10->xvclk);
> +	if (ret < 0) {
> +		dev_err(dev, "Failed to enable xvclk\n");
> +		return ret;
> +	}
> +
> +	/* note: set 0 is high, set 1 is low */
> +	gpiod_set_value_cansleep(ov02a10->reset_gpio, 1);
> +	gpiod_set_value_cansleep(ov02a10->pwdn_gpio, 0);
> +
> +	ret = regulator_bulk_enable(ov02a10_NUM_SUPPLIES, ov02a10->supplies);
> +	if (ret < 0) {
> +		dev_err(dev, "Failed to enable regulators\n");
> +		goto disable_clk;
> +	}
> +	usleep_range(7 * 1000, 8 * 1000);
> +
> +	gpiod_set_value_cansleep(ov02a10->pwdn_gpio, 1);
> +	usleep_range(10 * 1000, 12 * 1000);
> +
> +	gpiod_set_value_cansleep(ov02a10->reset_gpio, 0);
> +	usleep_range(10 * 1000, 12 * 1000);
> +
> +#ifdef SENSOR_HARDWARE_RESET
what is the purpose this macro? My understanding - if reset_gpio is not
NULL, driver should do hardware reset.
> +	/* sensor hardware reset */
> +	gpiod_set_value_cansleep(ov02a10->reset_gpio, 1);
> +	usleep_range(10 * 1000, 12 * 1000);
> +	gpiod_set_value_cansleep(ov02a10->reset_gpio, 0);
> +	usleep_range(10 * 1000, 12 * 1000);
> +#endif
> +
Could you clean up the usleep_range value here? If you want to need
bigger sleep, you can use msleep.
> +	return 0;
> +
> +disable_clk:
> +	clk_disable_unprepare(ov02a10->xvclk);
> +
> +	return ret;
> +}
> +
> +static void __ov02a10_power_off(struct ov02a10 *ov02a10)
> +{
> +	clk_disable_unprepare(ov02a10->xvclk);
> +	gpiod_set_value_cansleep(ov02a10->reset_gpio, 1);
> +	gpiod_set_value_cansleep(ov02a10->pwdn_gpio, 1);
> +	regulator_bulk_disable(ov02a10_NUM_SUPPLIES, ov02a10->supplies);
> +}
> +
> +static int __ov02a10_start_stream(struct ov02a10 *ov02a10)
> +{
> +	int ret;
> +
> +	ret = ov02a10_write_array(ov02a10->client, ov02a10->cur_mode->reg_list);
> +	if (ret)
> +		return ret;
> +
> +	ret = __v4l2_ctrl_handler_setup(&ov02a10->ctrl_handler);
> +	if (ret) {
> +		pr_err("__v4l2_ctrl_handler_setup fail %d\n", ret);
dev_err?
> +		return ret;
> +	}
> +
> +	return ov02a10_write_reg(ov02a10->client,
> +				 REG_SC_CTRL_MODE, SC_CTRL_MODE_STREAMING);
> +}
> +
> +static int __ov02a10_stop_stream(struct ov02a10 *ov02a10)
> +{
> +	return ov02a10_write_reg(ov02a10->client,
> +				 REG_SC_CTRL_MODE, SC_CTRL_MODE_STANDBY);
> +}
> +
> +static int ov02a10_s_stream(struct v4l2_subdev *sd, int on)
> +{
> +	struct ov02a10 *ov02a10 = to_ov02a10(sd);
> +	struct i2c_client *client = ov02a10->client;
> +	int ret = 0;
> +
> +	pr_info("ov02a10 s_stream-(%d)\n", on);
remove this debug info, or use dev_dbg?
> +	mutex_lock(&ov02a10->mutex);
> +
> +	if (ov02a10->streaming == !on) {
You can runtime pm interface to check the power status.
And I suggest use:
if (on) {
	...
	return 0;
}

/*stream off */
...

> +		if (on) {
> +			ret = pm_runtime_get_sync(&client->dev);
> +			if (ret < 0) {
> +				pm_runtime_put_noidle(&client->dev);
> +				goto unlock_and_return;
> +			}
> +
> +			ret = __ov02a10_start_stream(ov02a10);
> +			if (ret) {
> +				v4l2_err(sd, "start stream failed while write regs\n");
> +				pm_runtime_put(&client->dev);
> +				goto unlock_and_return;
> +			}
> +		} else {
> +			__ov02a10_stop_stream(ov02a10);
> +			pm_runtime_put(&client->dev);
> +		}
> +
> +		ov02a10->streaming = on;
> +	}
> +
> +unlock_and_return:
> +	mutex_unlock(&ov02a10->mutex);
> +
> +	return ret;
> +}
> +
> +#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
> +static int ov02a10_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
> +{
> +	struct ov02a10 *ov02a10 = to_ov02a10(sd);
> +	struct v4l2_mbus_framefmt *try_fmt;
> +
> +	mutex_lock(&ov02a10->mutex);
> +
> +	try_fmt = v4l2_subdev_get_try_format(sd, fh->pad, 0);
> +	/* Initialize try_fmt */
> +	ov02a10_fill_fmt(&supported_modes[0], try_fmt);
> +
> +	mutex_unlock(&ov02a10->mutex);
> +
> +	return 0;
> +}
> +#endif
> +
> +static int __maybe_unused ov02a10_runtime_resume(struct device *dev)
> +{
> +	struct i2c_client *client = to_i2c_client(dev);
> +	struct v4l2_subdev *sd = i2c_get_clientdata(client);
> +	struct ov02a10 *ov02a10 = to_ov02a10(sd);
> +
> +	return __ov02a10_power_on(ov02a10);
> +}
> +
> +static int __maybe_unused ov02a10_runtime_suspend(struct device *dev)
> +{
> +	struct i2c_client *client = to_i2c_client(dev);
> +	struct v4l2_subdev *sd = i2c_get_clientdata(client);
> +	struct ov02a10 *ov02a10 = to_ov02a10(sd);
> +
> +	if (ov02a10->streaming == 1) {
> +		__ov02a10_stop_stream(ov02a10);
Why not use ov02a10_s_stream?
> +		ov02a10->streaming = 0;
> +	}
> +	__ov02a10_power_off(ov02a10);
> +
> +	return 0;
> +}
> +
> +static const struct dev_pm_ops ov02a10_pm_ops = {
> +	SET_RUNTIME_PM_OPS(ov02a10_runtime_suspend,
> +			   ov02a10_runtime_resume, NULL)
> +};
> +
> +static int ov02a10_mod_reg(struct ov02a10 *ov02a10, u16 reg,
> +			   u8 mask, u8 val)
indent issue

> +{
> +	u8 read_val;
> +	int ret;
> +
> +	ret = ov02a10_read_reg(ov02a10->client, reg, &read_val);
> +	if (ret)
> +		return ret;
> +
> +	read_val &= ~mask;
> +	val &= mask;
> +	val |= read_val;
> +
> +	return ov02a10_write_reg(ov02a10->client, reg, val);
> +}
> +
> +/* mirror & flip reg setting effective */
> +static int ov02a10_bayer_order(struct ov02a10 *ov02a10)
> +{
> +	int ret;
> +
> +	ret = ov02a10_write_reg(ov02a10->client,
> +				OV02A10_REG_UPDOWN_MIRROR_ENABLE,
> +				SC_CTRL_MODE_STREAMING);

SC_CTRL_MODE_STRAMING? Is it correct?

> +	if (ret < 0)
> +		return ret;
> +
> +	return 0;
> +}
> +
> +static int ov02a10_set_ctrl_hflip(struct ov02a10 *ov02a10, int value)
> +{
> +	/*
> +	 * If sensor is mounted upside down, mirror logic is inversed.
> +	 *
> +	 * Sensor is a BSI (Back Side Illuminated) one,
> +	 * so image captured is physically mirrored.
> +	 * This is why mirror logic is inversed in
> +	 * order to cancel this mirror effect.
> +	 */
> +
> +	/*
> +	 * P1: 0x3F:
> +	 * - [1]:	Vertical upside down
> +	 * - [0]:	Horizontal mirror
> +	 */
Move this comment above?
> +
> +	int ret;
> +
> +	ret = ov02a10_mod_reg(ov02a10, OV02A10_REG_UPDOWN_MIRROR,
> +			      BIT(0),
> +			      (!(value ^ ov02a10->upside_down)) ?
> +			      BIT(0) : 0);
> +
> +	if (ret < 0)
> +		return ret;
> +
> +	return ov02a10_bayer_order(ov02a10);
> +}
> +
> +static int ov02a10_set_ctrl_vflip(struct ov02a10 *ov02a10, int value)
> +{
> +	/* If sensor is mounted upside down, flip logic is inversed */
> +
> +	/*
> +	 * P1: 0x3F:
> +	 * - [1]:	Vertical upside down
> +	 * - [0]:	Horizontal mirror
> +	 */
Same as above.
> +
> +	int ret;
> +
> +	ret = ov02a10_mod_reg(ov02a10, OV02A10_REG_UPDOWN_MIRROR,
> +			      BIT(1),
> +			      (value ^ ov02a10->upside_down) ?
> +			      BIT(1) : 0);
> +
> +	if (ret < 0)
> +		return ret;
> +
> +	return ov02a10_bayer_order(ov02a10);
> +}
> +
> +static int ov02a10_set_test_pattern(struct ov02a10 *ov02a10, s32 value)
> +{
> +	int ret = 0;
> +
> +	if (value)
> +		return ov02a10_write_array(ov02a10->client,
> +					   ov02a10_test_pattern_regs);
> +
> +	return ret;
> +}
> +
> +static int ov02a10_set_ctrl(struct v4l2_ctrl *ctrl)
> +{
> +	struct ov02a10 *ov02a10 = container_of(ctrl->handler,
> +					     struct ov02a10, ctrl_handler);
> +	struct i2c_client *client = ov02a10->client;
> +	s64 max_expo;
> +	int ret = 0;
> +
> +	/* Propagate change of current control to all related controls */
> +	switch (ctrl->id) {
> +	case V4L2_CID_VBLANK:
> +		/* Update max exposure while meeting expected vblanking */
> +		max_expo = ov02a10->cur_mode->height + ctrl->val - 4;
> +		__v4l2_ctrl_modify_range(ov02a10->exposure,
> +					 ov02a10->exposure->minimum, max_expo,
> +					 ov02a10->exposure->step,
> +					 ov02a10->exposure->default_value);
> +		break;
> +	}
> +
> +	if (pm_runtime_get_if_in_use(&client->dev) <= 0)
> +		return 0;
> +
> +	switch (ctrl->id) {
> +	case V4L2_CID_EXPOSURE:
> +		ret = ov02a10_write_reg(client, 0xfd, 0x01);
> +		if (ret < 0)
> +			return ret;
> +		ret = ov02a10_write_reg(client, ov02a10_REG_EXPOSURE_H,
> +					((ctrl->val >> 8) & 0xFF));
> +		if (!ret) {
> +			ret = ov02a10_write_reg(client, ov02a10_REG_EXPOSURE_L,
> +						(ctrl->val & 0xFF));
> +			if (ret < 0)
> +				return ret;
> +		}
> +		ret = ov02a10_write_reg(client, 0x01, 0x01);
> +		if (ret < 0)
> +			return ret;
> +		break;
> +	case V4L2_CID_ANALOGUE_GAIN:
> +		ret = ov02a10_write_reg(client, 0xfd, 0x01);
> +		if (ret < 0)
> +			return ret;
> +		ret = ov02a10_write_reg(client, ov02a10_REG_GAIN,
> +					(ctrl->val & 0xFF));
> +		if (ret < 0)
> +			return ret;
> +		ret = ov02a10_write_reg(client, 0x01, 0x01);
> +		if (ret < 0)
> +			return ret;
> +		break;
> +	case V4L2_CID_VBLANK:
> +		ret = ov02a10_write_reg(client, 0xfd, 0x01);
> +		if (ret < 0)
> +			return ret;
> +		ret = ov02a10_write_reg(client, ov02a10_REG_VTS_H,
> +					(((ctrl->val +
> +					ov02a10->cur_mode->height - 1224) >> 8)
> +					& 0xFF));
> +		if (!ret) {
> +			ret = ov02a10_write_reg(client, ov02a10_REG_VTS_L,
> +						((ctrl->val +
> +						ov02a10->cur_mode->height -
> +						1224) & 0xFF));
> +			if (ret < 0)
> +				return ret;
> +		}
> +		ret = ov02a10_write_reg(client, 0x01, 0x01);
> +		if (ret < 0)
> +			return ret;
> +		break;
> +	case V4L2_CID_TEST_PATTERN:
> +		ret =
> +		 ov02a10_set_test_pattern(ov02a10,
> +					  ov02a10_test_pattern_val[ctrl->val]);
As comment above, you can use ctrl->val directly.
> +		break;
> +	case V4L2_CID_HFLIP:
> +		if (ov02a10->streaming)
> +			return -EBUSY;
> +		if (ctrl->val)
> +			ret = ov02a10_set_ctrl_hflip(ov02a10, ctrl->val);
> +		break;
> +	case V4L2_CID_VFLIP:
> +		if (ov02a10->streaming)
> +			return -EBUSY;
> +		if (ctrl->val)
> +			ret = ov02a10_set_ctrl_vflip(ov02a10, ctrl->val);
> +		break;
> +	default:
> +		dev_warn(&client->dev, "%s Unhandled id:0x%x, val:0x%x\n",
> +			 __func__, ctrl->id, ctrl->val);
> +		ret = -EINVAL;
> +		break;
> +	};
> +
> +	pm_runtime_put(&client->dev);
> +
> +	return ret;
> +}
> +
> +static const struct v4l2_subdev_video_ops ov02a10_video_ops = {
> +	.s_stream = ov02a10_s_stream,
> +};
> +
> +static const struct v4l2_subdev_pad_ops ov02a10_pad_ops = {
> +	.enum_mbus_code = ov02a10_enum_mbus_code,
> +	.enum_frame_size = ov02a10_enum_frame_sizes,
> +	.get_fmt = ov02a10_get_fmt,
> +	.set_fmt = ov02a10_set_fmt,
> +};
> +
> +static const struct v4l2_subdev_ops ov02a10_subdev_ops = {
> +	.video	= &ov02a10_video_ops,
> +	.pad	= &ov02a10_pad_ops,
> +};
> +
> +#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
> +static const struct v4l2_subdev_internal_ops ov02a10_internal_ops = {
> +	.open = ov02a10_open,
> +};
> +#endif
> +
> +static const struct v4l2_ctrl_ops ov02a10_ctrl_ops = {
> +	.s_ctrl = ov02a10_set_ctrl,
> +};
> +
> +static int ov02a10_initialize_controls(struct ov02a10 *ov02a10)
> +{
> +	const struct ov02a10_mode *mode;
> +	struct v4l2_ctrl_handler *handler;
> +	struct v4l2_ctrl *ctrl;
> +	u64 exposure_max;
> +	u32 pixel_rate, h_blank;
> +	int ret;
> +
> +	handler = &ov02a10->ctrl_handler;
> +	mode = ov02a10->cur_mode;
> +	ret = v4l2_ctrl_handler_init(handler, 8);
> +	if (ret)
> +		return ret;
> +	handler->lock = &ov02a10->mutex;
> +
> +	ctrl = v4l2_ctrl_new_int_menu(handler, NULL, V4L2_CID_LINK_FREQ,
> +				      0, 0, link_freq_menu_items);
> +	if (ctrl)
> +		ctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY;
> +
> +	pixel_rate = (link_freq_menu_items[0] * 2 * ov02a10_LANES) /
> +		     ov02a10_BITS_PER_SAMPLE;
> +	v4l2_ctrl_new_std(handler, NULL, V4L2_CID_PIXEL_RATE,
> +			  0, pixel_rate, 1, pixel_rate);
> +
> +	h_blank = mode->hts_def - mode->width;
> +	ov02a10->hblank = v4l2_ctrl_new_std(handler, NULL, V4L2_CID_HBLANK,
> +					    h_blank, h_blank, 1, h_blank);
> +	if (ov02a10->hblank)
> +		ov02a10->hblank->flags |= V4L2_CTRL_FLAG_READ_ONLY;
> +
> +	ov02a10->vblank = v4l2_ctrl_new_std(handler, &ov02a10_ctrl_ops,
> +					    V4L2_CID_VBLANK, mode->vts_def -
> +					    mode->height,
> +					    ov02a10_VTS_MAX - mode->height, 1,
> +					    mode->vts_def - mode->height);
> +
> +	exposure_max = mode->vts_def - 4;
> +	ov02a10->exposure = v4l2_ctrl_new_std(handler, &ov02a10_ctrl_ops,
> +					      V4L2_CID_EXPOSURE,
> +					      ov02a10_EXPOSURE_MIN,
> +					      exposure_max,
> +					      ov02a10_EXPOSURE_STEP,
> +					      mode->exp_def);
> +
> +	ov02a10->anal_gain = v4l2_ctrl_new_std(handler, &ov02a10_ctrl_ops,
> +					       V4L2_CID_ANALOGUE_GAIN,
> +					       ov02a10_GAIN_MIN,
> +					       ov02a10_GAIN_MAX,
> +					       ov02a10_GAIN_STEP,
> +					       ov02a10_GAIN_DEFAULT);
> +
> +	ov02a10->test_pattern =
> +	   v4l2_ctrl_new_std_menu_items(handler,
> +					&ov02a10_ctrl_ops,
> +					V4L2_CID_TEST_PATTERN,
> +					ARRAY_SIZE(ov02a10_test_pattern_menu) -
> +					1, 0, 0, ov02a10_test_pattern_menu);
> +
> +	if (handler->error) {
> +		ret = handler->error;
> +		dev_err(&ov02a10->client->dev,
> +			"Failed to init controls(%d)\n", ret);
> +		goto err_free_handler;
> +	}
> +
> +	ov02a10->subdev.ctrl_handler = handler;
> +
> +	return 0;
> +
> +err_free_handler:
> +	v4l2_ctrl_handler_free(handler);
> +
> +	return ret;
> +}
> +
> +static int ov02a10_check_sensor_id(struct ov02a10 *ov02a10,
> +				   struct i2c_client *client)
> +{
> +	struct device *dev = &ov02a10->client->dev;
> +	u8 pid = 0;
> +	u8 ver = 0;
> +	int ret;
> +
> +	/* Check sensor revision */
> +	ret = ov02a10_read_reg(client, OV02A10_REG_CHIP_ID_H, &pid);
> +	if (!ret)
> +		ret = ov02a10_read_reg(client, OV02A10_REG_CHIP_ID_L, &ver);
> +
> +	if (!ret) {
> +		unsigned short id;
> +
> +		id = OV02A10_ID(pid, ver);
> +		dev_info(dev, "ov02a10_sensor id(%04x)\n", id);
dev_dbg
> +		if (id != CHIP_ID) {
> +			dev_err(dev, "Unexpected sensor id(%04x), ret(%d)\n",
> +				id, ret);
> +			return ret;
> +		}
> +		dev_info(dev, "Detected OV%04X sensor\n", id);
dev_dbg
> +	}
> +
> +	return 0;
> +}
> +
> +static int ov02a10_configure_regulators(struct ov02a10 *ov02a10)
> +{
> +	int i;
> +
> +	for (i = 0; i < ov02a10_NUM_SUPPLIES; i++)
> +		ov02a10->supplies[i].supply = ov02a10_supply_names[i];
> +
> +	return devm_regulator_bulk_get(&ov02a10->client->dev,
> +				       ov02a10_NUM_SUPPLIES,
> +				       ov02a10->supplies);
> +}
> +
> +static int ov02a10_probe(struct i2c_client *client,
> +			 const struct i2c_device_id *id)
> +{
> +	struct device *dev = &client->dev;
> +	struct ov02a10 *ov02a10;
> +	u32 rotation;
> +	int ret;
> +
> +	dev_info(dev, "ov02a10 probe ++\n");
dev_dbg, remove ++
> +	ov02a10 = devm_kzalloc(dev, sizeof(*ov02a10), GFP_KERNEL);
> +	if (!ov02a10)
> +		return -ENOMEM;
> +
> +	ov02a10->client = client;
> +	ov02a10->cur_mode = &supported_modes[0];
> +
> +	/* optional indication of physical rotation of sensor */
> +	ret = fwnode_property_read_u32(dev_fwnode(dev), "rotation",
> +				       &rotation);
> +	if (!ret) {
> +		switch (rotation) {
> +		case 180:
> +			ov02a10->upside_down = true;
> +			/* fall through */
> +		case 0:
> +			break;
> +		default:
> +			dev_warn(dev, "%u degrees rotation is not supported, ignoring...\n",
> +				 rotation);
> +		}
> +	}
> +
> +	ov02a10->xvclk = devm_clk_get(dev, "xvclk");
> +	if (IS_ERR(ov02a10->xvclk)) {
> +		dev_err(dev, "Failed to get xvclk\n");
> +		return -EINVAL;
> +	}
> +	ret = clk_set_rate(ov02a10->xvclk, ov02a10_XVCLK_FREQ);
> +	if (ret < 0) {
> +		dev_err(dev, "Failed to set xvclk rate (24MHz)\n");
> +		return ret;
> +	}
> +	if (clk_get_rate(ov02a10->xvclk) != ov02a10_XVCLK_FREQ)
> +		dev_warn(dev, "xvclk mismatched, modes are based on 24MHz\n");
> +
> +	ov02a10->pwdn_gpio = devm_gpiod_get(dev, "pwdn", GPIOD_OUT_LOW);
> +	if (IS_ERR(ov02a10->pwdn_gpio)) {
> +		dev_err(dev, "Failed to get powerdown-gpios\n");
> +		return -EINVAL;
> +	}
> +
> +	ov02a10->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
> +	if (IS_ERR(ov02a10->reset_gpio)) {
> +		dev_err(dev, "Failed to get reset-gpios\n");
> +		return -EINVAL;
> +	}
> +
> +	ret = ov02a10_configure_regulators(ov02a10);
> +	if (ret) {
> +		dev_err(dev, "Failed to get power regulators\n");
> +		return ret;
> +	}
> +
> +	mutex_init(&ov02a10->mutex);
> +	v4l2_i2c_subdev_init(&ov02a10->subdev, client, &ov02a10_subdev_ops);
> +	ret = ov02a10_initialize_controls(ov02a10);
> +	if (ret) {
> +		dev_err(dev, "Failed to initialize controls\n");
> +		goto err_destroy_mutex;
> +	}
> +
> +	ret = __ov02a10_power_on(ov02a10);
> +	if (ret) {
> +		dev_err(dev, "Failed to power on\n");
> +		goto err_free_handler;
> +	}
> +
> +	ret = ov02a10_check_sensor_id(ov02a10, client);
> +	if (ret) {
> +		dev_err(dev, "Failed to detect id, go to power off\n");
> +		goto err_power_off;
> +	}
> +
> +#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
> +	ov02a10->subdev.internal_ops = &ov02a10_internal_ops;
> +	ov02a10->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
> +#endif
> +#if defined(CONFIG_MEDIA_CONTROLLER)
> +	ov02a10->pad.flags = MEDIA_PAD_FL_SOURCE;
> +	ov02a10->subdev.entity.function = MEDIA_ENT_F_CAM_SENSOR;
> +	ret = media_entity_pads_init(&ov02a10->subdev.entity, 1, &ov02a10->pad);
> +	if (ret < 0) {
> +		dev_err(dev, "Failed init pads\n");
> +		goto err_power_off;
> +	}
> +#endif
> +
> +	ret = v4l2_async_register_subdev(&ov02a10->subdev);
> +	if (ret) {
> +		dev_err(dev, "v4l2 async register subdev failed\n");
> +		goto err_clean_entity;
> +	}
> +
> +	pm_runtime_set_active(dev);
> +	pm_runtime_enable(dev);
> +	pm_runtime_idle(dev);
> +	dev_info(dev, "ov02a10 probe --\n");
dev_dbg, and other dev_info().
> +
> +	return 0;
> +
> +err_clean_entity:
> +#if defined(CONFIG_MEDIA_CONTROLLER)
> +	media_entity_cleanup(&ov02a10->subdev.entity);
> +#endif
> +err_power_off:
> +	__ov02a10_power_off(ov02a10);
> +err_free_handler:
> +	v4l2_ctrl_handler_free(&ov02a10->ctrl_handler);
> +err_destroy_mutex:
> +	mutex_destroy(&ov02a10->mutex);
> +
> +	return ret;
> +}
> +
> +static int ov02a10_remove(struct i2c_client *client)
> +{
> +	struct v4l2_subdev *sd = i2c_get_clientdata(client);
> +	struct ov02a10 *ov02a10 = to_ov02a10(sd);
> +
> +	v4l2_async_unregister_subdev(sd);
> +#if defined(CONFIG_MEDIA_CONTROLLER)
> +	media_entity_cleanup(&sd->entity);
> +#endif
> +	v4l2_ctrl_handler_free(&ov02a10->ctrl_handler);
> +	mutex_destroy(&ov02a10->mutex);
> +
> +	pm_runtime_disable(&client->dev);
> +	if (!pm_runtime_status_suspended(&client->dev))
> +		__ov02a10_power_off(ov02a10);
> +	pm_runtime_set_suspended(&client->dev);
> +
> +	return 0;
> +}
> +
> +#if IS_ENABLED(CONFIG_OF)
> +static const struct of_device_id ov02a10_of_match[] = {
> +	{ .compatible = "ovti,ov02a10" },
> +	{},
> +};
> +MODULE_DEVICE_TABLE(of, ov02a10_of_match);
> +#endif
> +
> +static struct i2c_driver ov02a10_i2c_driver = {
> +	.driver = {
> +		.name = "ov02a10",
> +		.pm = &ov02a10_pm_ops,
> +		.of_match_table = of_match_ptr(ov02a10_of_match),
> +	},
> +	.probe		= &ov02a10_probe,
> +	.remove		= &ov02a10_remove,
> +};
> +
> +module_i2c_driver(ov02a10_i2c_driver);
> +
> +MODULE_AUTHOR("Dongchun Zhu <dongchun.zhu@mediatek.com>");
> +MODULE_DESCRIPTION("OmniVision OV02A10 sensor driver");
> +MODULE_LICENSE("GPL v2");
> 

^ permalink raw reply	[flat|nested] 14+ messages in thread

* Re: [PATCH 3/3] media: dt-bindings: media: i2c: Add bindings for ov02a10
  2019-05-23 10:22 ` [PATCH 3/3] media: dt-bindings: media: i2c: Add bindings for ov02a10 dongchun.zhu
@ 2019-05-31 16:16   ` Sakari Ailus
  2019-06-13  3:30     ` Dongchun Zhu
  2019-06-14 16:56     ` Rob Herring
  0 siblings, 2 replies; 14+ messages in thread
From: Sakari Ailus @ 2019-05-31 16:16 UTC (permalink / raw)
  To: dongchun.zhu
  Cc: mchehab, robh+dt, mark.rutland, matthias.bgg, bingbu.cao,
	srv_heupstream, linux-mediatek, linux-arm-kernel, sj.huang,
	linux-media, devicetree, louis.kuo, menghui.lin, shengnan.wang

Hi Dongchun,

Thanks for the patch.

On Thu, May 23, 2019 at 06:22:04PM +0800, dongchun.zhu@mediatek.com wrote:
> From: Dongchun Zhu <dongchun.zhu@mediatek.com>
> 
> Add device tree binding documentation for the OV02A10 CMOS image sensor.
> 
> Signed-off-by: Dongchun Zhu <dongchun.zhu@mediatek.com>
> ---
>  .../devicetree/bindings/media/i2c/ov02a10.txt      | 43 ++++++++++++++++++++++
>  1 file changed, 43 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/media/i2c/ov02a10.txt
> 
> diff --git a/Documentation/devicetree/bindings/media/i2c/ov02a10.txt b/Documentation/devicetree/bindings/media/i2c/ov02a10.txt
> new file mode 100644
> index 0000000..fdc2904
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/i2c/ov02a10.txt
> @@ -0,0 +1,43 @@
> +* Omnivision OV02A10 MIPI CSI-2 sensor
> +
> +Required Properties:
> +- compatible: shall be "ovti,ov02a10"
> +- clocks: reference to the xvclk input clock
> +- clock-names: shall be "xvclk"
> +- avdd-supply: Analog voltage supply, 2.8 volts
> +- dovdd-supply: Digital I/O voltage supply, 1.8 volts
> +- dvdd-supply: Digital core voltage supply, 1.8 volts
> +- reset-gpios: Low active reset gpio
> +
> +The device node shall contain one 'port' child node with an
> +'endpoint' subnode for its digital output video port,
> +in accordance with the video interface bindings defined in
> +Documentation/devicetree/bindings/media/video-interfaces.txt.
> +The endpoint optional property 'data-lanes' shall be "<1>".

If the sensor only supports a single lane configuration (one lane), you can
omit that property altogether. Is that the only possible configuration for
the sensor?

Please also wrap the text at 80 characters, not 65 or so.

> +
> +Example:
> +&i2c4 {
> +	sensor_sub: sensor_sub {

camera-sensor@3d {

> +		compatible = "ovti,ov02a10";
> +		reg = <0x3d>;
> +		pinctrl-names = "default";
> +		pinctrl-0 = <&camera_pins_cam1_mclk_on>;
> +
> +		clocks = <&topckgen CLK_TOP_MUX_CAMTG2>,
> +			<&topckgen CLK_TOP_UNIVP_192M_D8>;
> +		clock-names = "xvclk", "freq_mux";
> +
> +		avdd-supply = <&mt6358_vcama1_reg>;
> +		dvdd-supply = <&mt6358_vcn18_reg>;
> +		dovdd-supply = <&mt6358_vcamio_reg>;
> +		pwdn-gpios = <&pio 107 1>;
> +		reset-gpios = <&pio 109 1>;
> +
> +		port@0 {
> +		   ov02a10_core: endpoint {
> +		       remote-endpoint = <&ov02a10_0>;
> +			   data-lanes = <1>;
> +		   };

Tabs for indentation, please.

> +		};
> +	};
> +};

-- 
Kind regards,

Sakari Ailus

^ permalink raw reply	[flat|nested] 14+ messages in thread

* Re: [PATCH 1/3] media: i2c: ov02a10: Add ov02a10 camera sensor driver
  2019-05-23 10:22 ` [PATCH 1/3] media: i2c: ov02a10: Add ov02a10 camera " dongchun.zhu
  2019-05-26  8:53   ` Nicolas Boichat
  2019-05-28  6:20   ` Bingbu Cao
@ 2019-05-31 17:03   ` Sakari Ailus
  2019-06-11 14:09     ` Dongchun Zhu
  2 siblings, 1 reply; 14+ messages in thread
From: Sakari Ailus @ 2019-05-31 17:03 UTC (permalink / raw)
  To: dongchun.zhu
  Cc: mchehab, robh+dt, mark.rutland, matthias.bgg, bingbu.cao,
	srv_heupstream, linux-mediatek, linux-arm-kernel, sj.huang,
	linux-media, devicetree, louis.kuo, menghui.lin, shengnan.wang

Hi Dongchun,

On Thu, May 23, 2019 at 06:22:02PM +0800, dongchun.zhu@mediatek.com wrote:
> From: Dongchun Zhu <dongchun.zhu@mediatek.com>
> 
> Add a V4L2 sub-device driver for the OmniVision image sensor.
> This is a camera sensor using the I2C bus for control and the
> CSI-2 bus for data.
> 
> Signed-off-by: Dongchun Zhu <dongchun.zhu@mediatek.com>

Please include the Kconfig change to this patch and add a line to
MAINTAINERS for the driver as well. The DT binding patch precedes the
driver one, and the MAINTAINERS change goes there, too.

> ---
>  drivers/media/i2c/Makefile  |    1 +
>  drivers/media/i2c/ov02a10.c | 1067 +++++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 1068 insertions(+)
>  create mode 100644 drivers/media/i2c/ov02a10.c
> 
> diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
> index d8ad9da..4b8f67b 100644
> --- a/drivers/media/i2c/Makefile
> +++ b/drivers/media/i2c/Makefile
> @@ -63,6 +63,7 @@ obj-$(CONFIG_VIDEO_VP27SMPX) += vp27smpx.o
>  obj-$(CONFIG_VIDEO_SONY_BTF_MPX) += sony-btf-mpx.o
>  obj-$(CONFIG_VIDEO_UPD64031A) += upd64031a.o
>  obj-$(CONFIG_VIDEO_UPD64083) += upd64083.o
> +obj-$(CONFIG_VIDEO_OV02A10) += ov02a10.o
>  obj-$(CONFIG_VIDEO_OV2640) += ov2640.o
>  obj-$(CONFIG_VIDEO_OV2680) += ov2680.o
>  obj-$(CONFIG_VIDEO_OV2685) += ov2685.o
> diff --git a/drivers/media/i2c/ov02a10.c b/drivers/media/i2c/ov02a10.c
> new file mode 100644
> index 0000000..39472ff
> --- /dev/null
> +++ b/drivers/media/i2c/ov02a10.c
> @@ -0,0 +1,1067 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * A V4L2 driver for OmniVision OV02A10 cameras.
> + *
> + * Based on Omnivision OV02A10 Camera Driver
> + * Copyright (C) 2019 MediaTek Inc.
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation version 2.
> + *
> + * This program is distributed .as is. WITHOUT ANY WARRANTY of any
> + * kind, whether express or implied; without even the implied warranty
> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/device.h>
> +#include <linux/delay.h>
> +#include <linux/gpio/consumer.h>
> +#include <linux/i2c.h>
> +#include <linux/module.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/regulator/consumer.h>
> +#include <linux/sysfs.h>

Do you need this?

> +#include <media/media-entity.h>
> +#include <media/v4l2-async.h>
> +#include <media/v4l2-ctrls.h>
> +#include <media/v4l2-subdev.h>
> +
> +#define CHIP_ID                                         0x2509
> +#define OV02A10_REG_CHIP_ID_H                           0x02
> +#define OV02A10_REG_CHIP_ID_L                           0x03
> +#define OV02A10_ID(_msb, _lsb)                          ((_msb) << 8 | (_lsb))
> +
> +/* bit[1] vertical upside down */
> +/* bit[0] horizontal mirror */
> +#define OV02A10_REG_UPDOWN_MIRROR                       0x3F
> +
> +/* enable mirror & flip global effective */
> +#define OV02A10_REG_UPDOWN_MIRROR_ENABLE                0x01
> +
> +#define ov02a10_XVCLK_FREQ                              24000000

The frequency goes to the DT bindings (clock-frequency property). Please
add it. Unless the oscillator is in the sensor, which I doubt.

> +#define REG_SC_CTRL_MODE                                0xac
> +
> +#define SC_CTRL_MODE_STANDBY                            0x00
> +#define SC_CTRL_MODE_STREAMING                          0x01
> +
> +#define ov02a10_REG_EXPOSURE_H                          0x03
> +#define ov02a10_REG_EXPOSURE_L                          0x04
> +#define	ov02a10_EXPOSURE_MIN                            4
> +#define	ov02a10_EXPOSURE_STEP                           1
> +
> +#define ov02a10_REG_VTS_H                               0x05
> +#define ov02a10_REG_VTS_L                               0x06
> +#define ov02a10_VTS_MAX                                 0x209f
> +#define ov02a10_VTS_MIN                                 0x04cf
> +
> +#define ov02a10_REG_GAIN                                0x24
> +#define ov02a10_GAIN_MIN                                0x10
> +#define ov02a10_GAIN_MAX                                0xf8
> +#define ov02a10_GAIN_STEP                               0x01
> +#define ov02a10_GAIN_DEFAULT                            0x40
> +
> +#define ov02a10_REG_TEST_PATTERN                        0x0d
> +#define ov02a10_TEST_PATTERN_DISABLED                   0x00
> +#define ov02a10_TEST_PATTERN_COLOR_BAR                  0x01
> +
> +#define REG_NULL                                        0xFF
> +
> +#define ov02a10_LANES                                   1
> +#define ov02a10_BITS_PER_SAMPLE                         10
> +
> +static const char * const ov02a10_supply_names[] = {
> +	"avdd",		/* Analog power */
> +	"dovdd",	/* Digital I/O power */
> +	"dvdd",		/* Digital core power */
> +};
> +
> +#define ov02a10_NUM_SUPPLIES ARRAY_SIZE(ov02a10_supply_names)
> +
> +struct regval {
> +	u16 addr;
> +	u8 val;
> +};
> +
> +struct ov02a10_mode {
> +	u32 width;
> +	u32 height;
> +	u32 exp_def;
> +	u32 hts_def;
> +	u32 vts_def;
> +	const struct regval *reg_list;
> +};
> +
> +struct ov02a10 {
> +	struct i2c_client	*client;
> +	struct clk		*xvclk;
> +	struct gpio_desc	*pwdn_gpio;
> +	struct gpio_desc	*reset_gpio;
> +	struct regulator_bulk_data supplies[ov02a10_NUM_SUPPLIES];
> +
> +	bool			streaming;
> +	bool			upside_down;
> +
> +	/*
> +	 * Serialize control access, get/set format, get selection
> +	 * and start streaming.
> +	 */
> +	struct mutex		mutex;
> +	struct v4l2_subdev	subdev;
> +	struct media_pad	pad;
> +	struct v4l2_ctrl	*anal_gain;
> +	struct v4l2_ctrl	*exposure;
> +	struct v4l2_ctrl	*hblank;
> +	struct v4l2_ctrl	*vblank;
> +	struct v4l2_ctrl	*test_pattern;
> +	struct v4l2_ctrl_handler ctrl_handler;
> +
> +	const struct ov02a10_mode *cur_mode;
> +};
> +
> +#define to_ov02a10(sd) container_of(sd, struct ov02a10, subdev)
> +
> +/* test pattern output */
> +static struct regval ov02a10_test_pattern_regs[] = {

const

> +	{0xfd, 0x01},
> +	{0x0d, 0x00},
> +	{0xb6, 0x01},
> +	{0x01, 0x01},
> +	{0xfd, 0x01},
> +	{0xac, 0x01},
> +	{REG_NULL, 0x00}
> +};
> +
> +/*
> + * Xclk 24Mhz
> + * Pclk 39Mhz
> + * linelength 934(0x3a6)
> + * framelength 1390(0x56E)
> + * grabwindow_width 1600
> + * grabwindow_height 1200
> + * max_framerate 30fps
> + * mipi_datarate per lane 780Mbps
> + */
> +static struct regval ov02a10_1600x1200_regs[] = {

Ditto.

> +	{0xfd, 0x01},
> +	{0xac, 0x00},
> +	{0xfd, 0x00},
> +	{0x2f, 0x29},
> +	{0x34, 0x00},
> +	{0x35, 0x21},
> +	{0x30, 0x15},
> +	{0x33, 0x01},
> +	{0xfd, 0x01},
> +	{0x44, 0x00},
> +	{0x2a, 0x4c},
> +	{0x2b, 0x1e},
> +	{0x2c, 0x60},
> +	{0x25, 0x11},
> +	{0x03, 0x01},
> +	{0x04, 0xae},
> +	{0x09, 0x00},
> +	{0x0a, 0x02},
> +	{0x06, 0xa6},
> +	{0x31, 0x00},
> +	{0x24, 0x40},
> +	{0x01, 0x01},
> +	{0xfb, 0x73},
> +	{0xfd, 0x01},
> +	{0x16, 0x04},
> +	{0x1c, 0x09},
> +	{0x21, 0x42},
> +	{0x12, 0x04},
> +	{0x13, 0x10},
> +	{0x11, 0x40},
> +	{0x33, 0x81},
> +	{0xd0, 0x00},
> +	{0xd1, 0x01},
> +	{0xd2, 0x00},
> +	{0x50, 0x10},
> +	{0x51, 0x23},
> +	{0x52, 0x20},
> +	{0x53, 0x10},
> +	{0x54, 0x02},
> +	{0x55, 0x20},
> +	{0x56, 0x02},
> +	{0x58, 0x48},
> +	{0x5d, 0x15},
> +	{0x5e, 0x05},
> +	{0x66, 0x66},
> +	{0x68, 0x68},
> +	{0x6b, 0x00},
> +	{0x6c, 0x00},
> +	{0x6f, 0x40},
> +	{0x70, 0x40},
> +	{0x71, 0x0a},
> +	{0x72, 0xf0},
> +	{0x73, 0x10},
> +	{0x75, 0x80},
> +	{0x76, 0x10},
> +	{0x84, 0x00},
> +	{0x85, 0x10},
> +	{0x86, 0x10},
> +	{0x87, 0x00},
> +	{0x8a, 0x22},
> +	{0x8b, 0x22},
> +	{0x19, 0xf1},
> +	{0x29, 0x01},
> +	{0xfd, 0x01},
> +	{0x9d, 0x96},
> +	{0xa0, 0x29},
> +	{0xa1, 0x05},
> +	{0xad, 0x62},
> +	{0xae, 0x00},
> +	{0xaf, 0x85},
> +	{0xb1, 0x01},
> +	{0x8e, 0x06},
> +	{0x8f, 0x40},
> +	{0x90, 0x04},
> +	{0x91, 0xb0},
> +	{0x45, 0x01},
> +	{0x46, 0x00},
> +	{0x47, 0x6c},
> +	{0x48, 0x03},
> +	{0x49, 0x8b},
> +	{0x4a, 0x00},
> +	{0x4b, 0x07},
> +	{0x4c, 0x04},
> +	{0x4d, 0xb7},
> +	{0xf0, 0x40},
> +	{0xf1, 0x40},
> +	{0xf2, 0x40},
> +	{0xf3, 0x40},
> +	{0x3f, 0x00},
> +	{0xfd, 0x01},
> +	{0x05, 0x00},
> +	{0x06, 0xa6},
> +	{0xfd, 0x01},
> +	{REG_NULL, 0x00}
> +};
> +
> +#define ov02a10_LINK_FREQ_390MHZ		390000000
> +static const s64 link_freq_menu_items[] = {
> +	ov02a10_LINK_FREQ_390MHZ
> +};
> +
> +static const char * const ov02a10_test_pattern_menu[] = {
> +	"Disabled",
> +	"Color Bar",
> +};
> +
> +static const int ov02a10_test_pattern_val[] = {
> +	ov02a10_TEST_PATTERN_DISABLED,
> +	ov02a10_TEST_PATTERN_COLOR_BAR,
> +};
> +
> +static const struct ov02a10_mode supported_modes[] = {
> +	{
> +		.width = 1600,
> +		.height = 1200,
> +		.exp_def = 0x01ae,
> +		.hts_def = 0x03a6,
> +		.vts_def = 0x056e,
> +		.reg_list = ov02a10_1600x1200_regs,
> +	},
> +};
> +
> +/* write a register */
> +static int ov02a10_write_reg(struct i2c_client *client, u8 addr, u8 val)
> +{
> +	u8 buf[2] = { addr, val };
> +

Extra newline.

> +	int ret = i2c_master_send(client, buf, 2);

Please declare ret separately. This has more functionality than is good to
put in variable declarations.

> +
> +	if (ret < 0) {
> +		dev_err(&client->dev, "%s: error: reg=%x, val=%x\n",
> +			__func__, addr, val);
> +		return ret;
> +	}
> +
> +	return ret == 2 ? 0 : ret;
> +}
> +
> +static int ov02a10_write_array(struct i2c_client *client,
> +			       const struct regval *regs)
> +{
> +	int ret = 0;

No need to initialise ret.

> +	u32 i;
> +
> +	for (i = 0; ret == 0 && regs[i].addr != REG_NULL; i++) {
> +		ret = ov02a10_write_reg(client, regs[i].addr, regs[i].val);
> +		if (ret < 0)
> +			return ret;
> +	}
> +
> +	return 0;
> +}
> +
> +/* read a register */
> +static int ov02a10_read_reg(struct i2c_client *client, u8 reg, u8 *val)
> +{
> +	int ret;

Temporary variables, return values are usually best declared as last.

> +	u8 data = reg;
> +	struct i2c_msg msg = {
> +		.addr	= client->addr,
> +		.flags	= 0,
> +		.len	= 1,
> +		.buf	= &data,
> +	};
> +
> +	ret = i2c_transfer(client->adapter, &msg, 1);
> +	if (ret < 0) {
> +		dev_err(&client->dev, "i2c_transfer failed, ret %d\n", ret);
> +		goto err;
> +	}
> +
> +	msg.flags = I2C_M_RD;
> +	ret = i2c_transfer(client->adapter, &msg, 1);
> +	if (ret < 0) {
> +		dev_err(&client->dev, "i2c_transfer --I2C_M_RD failed, \
> +			ret %d\n", ret);
> +		goto err;
> +	}
> +
> +	*val = data;
> +	return 0;
> +
> +err:
> +	dev_err(&client->dev, "Failed reading register 0x%02x!\n", reg);
> +	return ret;
> +}
> +
> +static void ov02a10_fill_fmt(const struct ov02a10_mode *mode,
> +			     struct v4l2_mbus_framefmt *fmt)
> +{
> +	fmt->code = MEDIA_BUS_FMT_SBGGR10_1X10;
> +	fmt->width = mode->width;
> +	fmt->height = mode->height;
> +	fmt->field = V4L2_FIELD_NONE;
> +}
> +
> +static int ov02a10_set_fmt(struct v4l2_subdev *sd,
> +			   struct v4l2_subdev_pad_config *cfg,
> +			   struct v4l2_subdev_format *fmt)
> +{
> +	struct ov02a10 *ov02a10 = to_ov02a10(sd);
> +	struct v4l2_mbus_framefmt *mbus_fmt = &fmt->format;
> +
> +	/* only one mode supported for now */
> +	ov02a10_fill_fmt(ov02a10->cur_mode, mbus_fmt);
> +
> +	return 0;
> +}
> +
> +static int ov02a10_get_fmt(struct v4l2_subdev *sd,
> +			   struct v4l2_subdev_pad_config *cfg,
> +			   struct v4l2_subdev_format *fmt)
> +{
> +	struct ov02a10 *ov02a10 = to_ov02a10(sd);
> +	struct v4l2_mbus_framefmt *mbus_fmt = &fmt->format;
> +
> +	ov02a10_fill_fmt(ov02a10->cur_mode, mbus_fmt);
> +
> +	return 0;
> +}
> +
> +static int ov02a10_enum_mbus_code(struct v4l2_subdev *sd,
> +				  struct v4l2_subdev_pad_config *cfg,
> +				  struct v4l2_subdev_mbus_code_enum *code)
> +{
> +	if (code->index >= ARRAY_SIZE(supported_modes))

This isn't an enumeration supported modes but media bus formats. Therefore,
index != 0 should yield -EINVAL.

> +		return -EINVAL;
> +
> +	code->code = MEDIA_BUS_FMT_SBGGR10_1X10;
> +
> +	return 0;
> +}
> +
> +static int ov02a10_enum_frame_sizes(struct v4l2_subdev *sd,
> +				    struct v4l2_subdev_pad_config *cfg,
> +				    struct v4l2_subdev_frame_size_enum *fse)
> +{
> +	int index = fse->index;
> +
> +	if (index >= ARRAY_SIZE(supported_modes))

Be sure to use use the same signedness in comparisons, especially when
validating user input.

> +		return -EINVAL;
> +
> +	fse->code = MEDIA_BUS_FMT_SBGGR10_1X10;

Instead you need check the caller set this. The frame sizes could be
different for different media bus formats.

> +
> +	fse->min_width  = supported_modes[index].width;
> +	fse->max_width  = supported_modes[index].width;
> +	fse->max_height = supported_modes[index].height;
> +	fse->min_height = supported_modes[index].height;
> +
> +	return 0;
> +}
> +
> +static int __ov02a10_power_on(struct ov02a10 *ov02a10)
> +{
> +	int ret;
> +

Please declare ret as last; no need for a newline.

> +	struct device *dev = &ov02a10->client->dev;
> +
> +	ret = clk_prepare_enable(ov02a10->xvclk);
> +	if (ret < 0) {
> +		dev_err(dev, "Failed to enable xvclk\n");
> +		return ret;
> +	}
> +
> +	/* note: set 0 is high, set 1 is low */
> +	gpiod_set_value_cansleep(ov02a10->reset_gpio, 1);
> +	gpiod_set_value_cansleep(ov02a10->pwdn_gpio, 0);
> +
> +	ret = regulator_bulk_enable(ov02a10_NUM_SUPPLIES, ov02a10->supplies);
> +	if (ret < 0) {
> +		dev_err(dev, "Failed to enable regulators\n");
> +		goto disable_clk;
> +	}
> +	usleep_range(7 * 1000, 8 * 1000);
> +
> +	gpiod_set_value_cansleep(ov02a10->pwdn_gpio, 1);
> +	usleep_range(10 * 1000, 12 * 1000);
> +
> +	gpiod_set_value_cansleep(ov02a10->reset_gpio, 0);
> +	usleep_range(10 * 1000, 12 * 1000);
> +
> +#ifdef SENSOR_HARDWARE_RESET

This doesn't seem to be defined. When is this needed? The reset GPIO is
already set high previously in the function.

> +	/* sensor hardware reset */
> +	gpiod_set_value_cansleep(ov02a10->reset_gpio, 1);
> +	usleep_range(10 * 1000, 12 * 1000);
> +	gpiod_set_value_cansleep(ov02a10->reset_gpio, 0);
> +	usleep_range(10 * 1000, 12 * 1000);
> +#endif
> +
> +	return 0;
> +
> +disable_clk:
> +	clk_disable_unprepare(ov02a10->xvclk);
> +
> +	return ret;
> +}
> +
> +static void __ov02a10_power_off(struct ov02a10 *ov02a10)
> +{
> +	clk_disable_unprepare(ov02a10->xvclk);
> +	gpiod_set_value_cansleep(ov02a10->reset_gpio, 1);
> +	gpiod_set_value_cansleep(ov02a10->pwdn_gpio, 1);
> +	regulator_bulk_disable(ov02a10_NUM_SUPPLIES, ov02a10->supplies);
> +}
~> +
> +static int __ov02a10_start_stream(struct ov02a10 *ov02a10)
> +{
> +	int ret;
> +
> +	ret = ov02a10_write_array(ov02a10->client, ov02a10->cur_mode->reg_list);
> +	if (ret)
> +		return ret;
> +
> +	ret = __v4l2_ctrl_handler_setup(&ov02a10->ctrl_handler);
> +	if (ret) {
> +		pr_err("__v4l2_ctrl_handler_setup fail %d\n", ret);
> +		return ret;
> +	}
> +
> +	return ov02a10_write_reg(ov02a10->client,
> +				 REG_SC_CTRL_MODE, SC_CTRL_MODE_STREAMING);
> +}
> +
> +static int __ov02a10_stop_stream(struct ov02a10 *ov02a10)
> +{
> +	return ov02a10_write_reg(ov02a10->client,
> +				 REG_SC_CTRL_MODE, SC_CTRL_MODE_STANDBY);
> +}
> +
> +static int ov02a10_s_stream(struct v4l2_subdev *sd, int on)
> +{
> +	struct ov02a10 *ov02a10 = to_ov02a10(sd);
> +	struct i2c_client *client = ov02a10->client;
> +	int ret = 0;
> +
> +	pr_info("ov02a10 s_stream-(%d)\n", on);

Please stick to one way to print messages (dev_*, v4l2_* or pr_*); as you
have a device, the first one would seem the proper choice. The message
in this case also seems rather redundant.

> +	mutex_lock(&ov02a10->mutex);
> +
> +	if (ov02a10->streaming == !on) {
> +		if (on) {
> +			ret = pm_runtime_get_sync(&client->dev);
> +			if (ret < 0) {
> +				pm_runtime_put_noidle(&client->dev);
> +				goto unlock_and_return;
> +			}
> +
> +			ret = __ov02a10_start_stream(ov02a10);
> +			if (ret) {
> +				v4l2_err(sd, "start stream failed while write regs\n");
> +				pm_runtime_put(&client->dev);
> +				goto unlock_and_return;
> +			}
> +		} else {
> +			__ov02a10_stop_stream(ov02a10);
> +			pm_runtime_put(&client->dev);
> +		}
> +
> +		ov02a10->streaming = on;
> +	}
> +
> +unlock_and_return:
> +	mutex_unlock(&ov02a10->mutex);
> +
> +	return ret;
> +}
> +
> +#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
> +static int ov02a10_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
> +{
> +	struct ov02a10 *ov02a10 = to_ov02a10(sd);
> +	struct v4l2_mbus_framefmt *try_fmt;
> +
> +	mutex_lock(&ov02a10->mutex);
> +
> +	try_fmt = v4l2_subdev_get_try_format(sd, fh->pad, 0);
> +	/* Initialize try_fmt */
> +	ov02a10_fill_fmt(&supported_modes[0], try_fmt);

If this is all you need, you should implement the init_cfg pad op.

> +
> +	mutex_unlock(&ov02a10->mutex);
> +
> +	return 0;
> +}
> +#endif
> +
> +static int __maybe_unused ov02a10_runtime_resume(struct device *dev)
> +{
> +	struct i2c_client *client = to_i2c_client(dev);
> +	struct v4l2_subdev *sd = i2c_get_clientdata(client);
> +	struct ov02a10 *ov02a10 = to_ov02a10(sd);
> +
> +	return __ov02a10_power_on(ov02a10);
> +}
> +
> +static int __maybe_unused ov02a10_runtime_suspend(struct device *dev)
> +{
> +	struct i2c_client *client = to_i2c_client(dev);
> +	struct v4l2_subdev *sd = i2c_get_clientdata(client);
> +	struct ov02a10 *ov02a10 = to_ov02a10(sd);
> +
> +	if (ov02a10->streaming == 1) {
> +		__ov02a10_stop_stream(ov02a10);
> +		ov02a10->streaming = 0;
> +	}
> +	__ov02a10_power_off(ov02a10);
> +
> +	return 0;
> +}
> +
> +static const struct dev_pm_ops ov02a10_pm_ops = {
> +	SET_RUNTIME_PM_OPS(ov02a10_runtime_suspend,
> +			   ov02a10_runtime_resume, NULL)
> +};
> +
> +static int ov02a10_mod_reg(struct ov02a10 *ov02a10, u16 reg,
> +			   u8 mask, u8 val)
> +{
> +	u8 read_val;
> +	int ret;
> +
> +	ret = ov02a10_read_reg(ov02a10->client, reg, &read_val);
> +	if (ret)
> +		return ret;
> +
> +	read_val &= ~mask;
> +	val &= mask;
> +	val |= read_val;
> +
> +	return ov02a10_write_reg(ov02a10->client, reg, val);
> +}
> +
> +/* mirror & flip reg setting effective */
> +static int ov02a10_bayer_order(struct ov02a10 *ov02a10)
> +{
> +	int ret;
> +
> +	ret = ov02a10_write_reg(ov02a10->client,
> +				OV02A10_REG_UPDOWN_MIRROR_ENABLE,
> +				SC_CTRL_MODE_STREAMING);
> +	if (ret < 0)
> +		return ret;
> +
> +	return 0;
> +}
> +
> +static int ov02a10_set_ctrl_hflip(struct ov02a10 *ov02a10, int value)
> +{
> +	/*
> +	 * If sensor is mounted upside down, mirror logic is inversed.
> +	 *
> +	 * Sensor is a BSI (Back Side Illuminated) one,
> +	 * so image captured is physically mirrored.
> +	 * This is why mirror logic is inversed in
> +	 * order to cancel this mirror effect.
> +	 */
> +
> +	/*
> +	 * P1: 0x3F:
> +	 * - [1]:	Vertical upside down
> +	 * - [0]:	Horizontal mirror
> +	 */
> +
> +	int ret;
> +
> +	ret = ov02a10_mod_reg(ov02a10, OV02A10_REG_UPDOWN_MIRROR,
> +			      BIT(0),
> +			      (!(value ^ ov02a10->upside_down)) ?
> +			      BIT(0) : 0);
> +
> +	if (ret < 0)
> +		return ret;
> +
> +	return ov02a10_bayer_order(ov02a10);
> +}
> +
> +static int ov02a10_set_ctrl_vflip(struct ov02a10 *ov02a10, int value)
> +{
> +	/* If sensor is mounted upside down, flip logic is inversed */
> +
> +	/*
> +	 * P1: 0x3F:
> +	 * - [1]:	Vertical upside down
> +	 * - [0]:	Horizontal mirror
> +	 */
> +
> +	int ret;
> +
> +	ret = ov02a10_mod_reg(ov02a10, OV02A10_REG_UPDOWN_MIRROR,
> +			      BIT(1),
> +			      (value ^ ov02a10->upside_down) ?
> +			      BIT(1) : 0);
> +
> +	if (ret < 0)
> +		return ret;
> +
> +	return ov02a10_bayer_order(ov02a10);
> +}
> +
> +static int ov02a10_set_test_pattern(struct ov02a10 *ov02a10, s32 value)
> +{
> +	int ret = 0;

ret is redundant.

> +
> +	if (value)
> +		return ov02a10_write_array(ov02a10->client,
> +					   ov02a10_test_pattern_regs);

Don't you need to disable the test pattern on the sensor if the user
disables it?

> +
> +	return ret;
> +}
> +
> +static int ov02a10_set_ctrl(struct v4l2_ctrl *ctrl)
> +{
> +	struct ov02a10 *ov02a10 = container_of(ctrl->handler,
> +					     struct ov02a10, ctrl_handler);
> +	struct i2c_client *client = ov02a10->client;
> +	s64 max_expo;
> +	int ret = 0;
> +
> +	/* Propagate change of current control to all related controls */
> +	switch (ctrl->id) {
> +	case V4L2_CID_VBLANK:
> +		/* Update max exposure while meeting expected vblanking */
> +		max_expo = ov02a10->cur_mode->height + ctrl->val - 4;
> +		__v4l2_ctrl_modify_range(ov02a10->exposure,
> +					 ov02a10->exposure->minimum, max_expo,
> +					 ov02a10->exposure->step,
> +					 ov02a10->exposure->default_value);
> +		break;
> +	}
> +
> +	if (pm_runtime_get_if_in_use(&client->dev) <= 0)
> +		return 0;
> +
> +	switch (ctrl->id) {
> +	case V4L2_CID_EXPOSURE:
> +		ret = ov02a10_write_reg(client, 0xfd, 0x01);
> +		if (ret < 0)
> +			return ret;
> +		ret = ov02a10_write_reg(client, ov02a10_REG_EXPOSURE_H,
> +					((ctrl->val >> 8) & 0xFF));
> +		if (!ret) {
> +			ret = ov02a10_write_reg(client, ov02a10_REG_EXPOSURE_L,
> +						(ctrl->val & 0xFF));
> +			if (ret < 0)
> +				return ret;
> +		}
> +		ret = ov02a10_write_reg(client, 0x01, 0x01);
> +		if (ret < 0)
> +			return ret;
> +		break;
> +	case V4L2_CID_ANALOGUE_GAIN:
> +		ret = ov02a10_write_reg(client, 0xfd, 0x01);
> +		if (ret < 0)
> +			return ret;
> +		ret = ov02a10_write_reg(client, ov02a10_REG_GAIN,
> +					(ctrl->val & 0xFF));
> +		if (ret < 0)
> +			return ret;
> +		ret = ov02a10_write_reg(client, 0x01, 0x01);
> +		if (ret < 0)
> +			return ret;
> +		break;
> +	case V4L2_CID_VBLANK:
> +		ret = ov02a10_write_reg(client, 0xfd, 0x01);
> +		if (ret < 0)
> +			return ret;
> +		ret = ov02a10_write_reg(client, ov02a10_REG_VTS_H,
> +					(((ctrl->val +
> +					ov02a10->cur_mode->height - 1224) >> 8)
> +					& 0xFF));
> +		if (!ret) {
> +			ret = ov02a10_write_reg(client, ov02a10_REG_VTS_L,
> +						((ctrl->val +
> +						ov02a10->cur_mode->height -
> +						1224) & 0xFF));
> +			if (ret < 0)
> +				return ret;
> +		}
> +		ret = ov02a10_write_reg(client, 0x01, 0x01);
> +		if (ret < 0)
> +			return ret;
> +		break;
> +	case V4L2_CID_TEST_PATTERN:
> +		ret =
> +		 ov02a10_set_test_pattern(ov02a10,

Alignment. Sometimes it could be that you don't find perfect choices, but
usually it's a good choice to respect the indentation rules.

> +					  ov02a10_test_pattern_val[ctrl->val]);
> +		break;
> +	case V4L2_CID_HFLIP:
> +		if (ov02a10->streaming)
> +			return -EBUSY;

You could instead use v4l2_ctrl_grab() (or the unlocked variant) when
streaming starts. Same below.

> +		if (ctrl->val)
> +			ret = ov02a10_set_ctrl_hflip(ov02a10, ctrl->val);
> +		break;
> +	case V4L2_CID_VFLIP:
> +		if (ov02a10->streaming)
> +			return -EBUSY;
> +		if (ctrl->val)
> +			ret = ov02a10_set_ctrl_vflip(ov02a10, ctrl->val);
> +		break;
> +	default:
> +		dev_warn(&client->dev, "%s Unhandled id:0x%x, val:0x%x\n",
> +			 __func__, ctrl->id, ctrl->val);
> +		ret = -EINVAL;
> +		break;
> +	};
> +
> +	pm_runtime_put(&client->dev);
> +
> +	return ret;
> +}
> +
> +static const struct v4l2_subdev_video_ops ov02a10_video_ops = {
> +	.s_stream = ov02a10_s_stream,
> +};
> +
> +static const struct v4l2_subdev_pad_ops ov02a10_pad_ops = {
> +	.enum_mbus_code = ov02a10_enum_mbus_code,
> +	.enum_frame_size = ov02a10_enum_frame_sizes,
> +	.get_fmt = ov02a10_get_fmt,
> +	.set_fmt = ov02a10_set_fmt,
> +};
> +
> +static const struct v4l2_subdev_ops ov02a10_subdev_ops = {
> +	.video	= &ov02a10_video_ops,
> +	.pad	= &ov02a10_pad_ops,
> +};
> +
> +#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
> +static const struct v4l2_subdev_internal_ops ov02a10_internal_ops = {
> +	.open = ov02a10_open,
> +};
> +#endif
> +
> +static const struct v4l2_ctrl_ops ov02a10_ctrl_ops = {
> +	.s_ctrl = ov02a10_set_ctrl,
> +};
> +
> +static int ov02a10_initialize_controls(struct ov02a10 *ov02a10)
> +{
> +	const struct ov02a10_mode *mode;
> +	struct v4l2_ctrl_handler *handler;
> +	struct v4l2_ctrl *ctrl;
> +	u64 exposure_max;
> +	u32 pixel_rate, h_blank;
> +	int ret;
> +
> +	handler = &ov02a10->ctrl_handler;
> +	mode = ov02a10->cur_mode;
> +	ret = v4l2_ctrl_handler_init(handler, 8);
> +	if (ret)
> +		return ret;
> +	handler->lock = &ov02a10->mutex;
> +
> +	ctrl = v4l2_ctrl_new_int_menu(handler, NULL, V4L2_CID_LINK_FREQ,
> +				      0, 0, link_freq_menu_items);
> +	if (ctrl)
> +		ctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY;
> +
> +	pixel_rate = (link_freq_menu_items[0] * 2 * ov02a10_LANES) /
> +		     ov02a10_BITS_PER_SAMPLE;
> +	v4l2_ctrl_new_std(handler, NULL, V4L2_CID_PIXEL_RATE,
> +			  0, pixel_rate, 1, pixel_rate);
> +
> +	h_blank = mode->hts_def - mode->width;
> +	ov02a10->hblank = v4l2_ctrl_new_std(handler, NULL, V4L2_CID_HBLANK,
> +					    h_blank, h_blank, 1, h_blank);
> +	if (ov02a10->hblank)
> +		ov02a10->hblank->flags |= V4L2_CTRL_FLAG_READ_ONLY;
> +
> +	ov02a10->vblank = v4l2_ctrl_new_std(handler, &ov02a10_ctrl_ops,
> +					    V4L2_CID_VBLANK, mode->vts_def -
> +					    mode->height,
> +					    ov02a10_VTS_MAX - mode->height, 1,
> +					    mode->vts_def - mode->height);
> +
> +	exposure_max = mode->vts_def - 4;
> +	ov02a10->exposure = v4l2_ctrl_new_std(handler, &ov02a10_ctrl_ops,
> +					      V4L2_CID_EXPOSURE,
> +					      ov02a10_EXPOSURE_MIN,
> +					      exposure_max,
> +					      ov02a10_EXPOSURE_STEP,
> +					      mode->exp_def);
> +
> +	ov02a10->anal_gain = v4l2_ctrl_new_std(handler, &ov02a10_ctrl_ops,
> +					       V4L2_CID_ANALOGUE_GAIN,
> +					       ov02a10_GAIN_MIN,
> +					       ov02a10_GAIN_MAX,
> +					       ov02a10_GAIN_STEP,
> +					       ov02a10_GAIN_DEFAULT);
> +
> +	ov02a10->test_pattern =
> +	   v4l2_ctrl_new_std_menu_items(handler,

Indentation.

> +					&ov02a10_ctrl_ops,
> +					V4L2_CID_TEST_PATTERN,
> +					ARRAY_SIZE(ov02a10_test_pattern_menu) -
> +					1, 0, 0, ov02a10_test_pattern_menu);
> +
> +	if (handler->error) {
> +		ret = handler->error;
> +		dev_err(&ov02a10->client->dev,
> +			"Failed to init controls(%d)\n", ret);
> +		goto err_free_handler;
> +	}
> +
> +	ov02a10->subdev.ctrl_handler = handler;
> +
> +	return 0;
> +
> +err_free_handler:
> +	v4l2_ctrl_handler_free(handler);
> +
> +	return ret;
> +}
> +
> +static int ov02a10_check_sensor_id(struct ov02a10 *ov02a10,
> +				   struct i2c_client *client)
> +{
> +	struct device *dev = &ov02a10->client->dev;
> +	u8 pid = 0;
> +	u8 ver = 0;
> +	int ret;
> +
> +	/* Check sensor revision */
> +	ret = ov02a10_read_reg(client, OV02A10_REG_CHIP_ID_H, &pid);
> +	if (!ret)
> +		ret = ov02a10_read_reg(client, OV02A10_REG_CHIP_ID_L, &ver);
> +
> +	if (!ret) {

You could simply return the error here if there's one, and unindent the
rest.

> +		unsigned short id;

Please use a type of explicit size here; you have 16 bits.

> +
> +		id = OV02A10_ID(pid, ver);
> +		dev_info(dev, "ov02a10_sensor id(%04x)\n", id);
> +		if (id != CHIP_ID) {
> +			dev_err(dev, "Unexpected sensor id(%04x), ret(%d)\n",
> +				id, ret);
> +			return ret;
> +		}
> +		dev_info(dev, "Detected OV%04X sensor\n", id);
> +	}
> +
> +	return 0;
> +}
> +
> +static int ov02a10_configure_regulators(struct ov02a10 *ov02a10)
> +{
> +	int i;

unsigned int

> +
> +	for (i = 0; i < ov02a10_NUM_SUPPLIES; i++)
> +		ov02a10->supplies[i].supply = ov02a10_supply_names[i];
> +
> +	return devm_regulator_bulk_get(&ov02a10->client->dev,
> +				       ov02a10_NUM_SUPPLIES,
> +				       ov02a10->supplies);
> +}
> +
> +static int ov02a10_probe(struct i2c_client *client,
> +			 const struct i2c_device_id *id)

Use the probe_new() callback the struct i2c_driver, and you can omit the id
table argument.

> +{
> +	struct device *dev = &client->dev;
> +	struct ov02a10 *ov02a10;
> +	u32 rotation;
> +	int ret;
> +
> +	dev_info(dev, "ov02a10 probe ++\n");
> +	ov02a10 = devm_kzalloc(dev, sizeof(*ov02a10), GFP_KERNEL);
> +	if (!ov02a10)
> +		return -ENOMEM;
> +
> +	ov02a10->client = client;

You can get client using v4l2_get_subdevdata() once you've called
v4l2_i2c_subdev_init() below. No need for a separate field.

> +	ov02a10->cur_mode = &supported_modes[0];
> +
> +	/* optional indication of physical rotation of sensor */
> +	ret = fwnode_property_read_u32(dev_fwnode(dev), "rotation",
> +				       &rotation);

Please add support for clock-frequency property, as discussed in my
comments to the DT binding patch.

> +	if (!ret) {
> +		switch (rotation) {
> +		case 180:
> +			ov02a10->upside_down = true;
> +			/* fall through */
> +		case 0:
> +			break;
> +		default:
> +			dev_warn(dev, "%u degrees rotation is not supported, ignoring...\n",
> +				 rotation);
> +		}
> +	}
> +
> +	ov02a10->xvclk = devm_clk_get(dev, "xvclk");
> +	if (IS_ERR(ov02a10->xvclk)) {
> +		dev_err(dev, "Failed to get xvclk\n");
> +		return -EINVAL;
> +	}
> +	ret = clk_set_rate(ov02a10->xvclk, ov02a10_XVCLK_FREQ);
> +	if (ret < 0) {
> +		dev_err(dev, "Failed to set xvclk rate (24MHz)\n");
> +		return ret;
> +	}
> +	if (clk_get_rate(ov02a10->xvclk) != ov02a10_XVCLK_FREQ)
> +		dev_warn(dev, "xvclk mismatched, modes are based on 24MHz\n");
> +
> +	ov02a10->pwdn_gpio = devm_gpiod_get(dev, "pwdn", GPIOD_OUT_LOW);
> +	if (IS_ERR(ov02a10->pwdn_gpio)) {
> +		dev_err(dev, "Failed to get powerdown-gpios\n");
> +		return -EINVAL;
> +	}
> +
> +	ov02a10->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
> +	if (IS_ERR(ov02a10->reset_gpio)) {
> +		dev_err(dev, "Failed to get reset-gpios\n");
> +		return -EINVAL;
> +	}
> +
> +	ret = ov02a10_configure_regulators(ov02a10);
> +	if (ret) {
> +		dev_err(dev, "Failed to get power regulators\n");
> +		return ret;
> +	}
> +
> +	mutex_init(&ov02a10->mutex);
> +	v4l2_i2c_subdev_init(&ov02a10->subdev, client, &ov02a10_subdev_ops);
> +	ret = ov02a10_initialize_controls(ov02a10);
> +	if (ret) {
> +		dev_err(dev, "Failed to initialize controls\n");
> +		goto err_destroy_mutex;
> +	}
> +
> +	ret = __ov02a10_power_on(ov02a10);
> +	if (ret) {
> +		dev_err(dev, "Failed to power on\n");
> +		goto err_free_handler;
> +	}
> +
> +	ret = ov02a10_check_sensor_id(ov02a10, client);
> +	if (ret) {
> +		dev_err(dev, "Failed to detect id, go to power off\n");
> +		goto err_power_off;
> +	}
> +
> +#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
> +	ov02a10->subdev.internal_ops = &ov02a10_internal_ops;
> +	ov02a10->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
> +#endif
> +#if defined(CONFIG_MEDIA_CONTROLLER)

I think you can put both under CONFIG_VIDEO_V4L2_SUBDEV_API;
CONFIG_MEDIA_CONTROLLER depends on it and there's practically no use for
MC without subdev nodes.

> +	ov02a10->pad.flags = MEDIA_PAD_FL_SOURCE;
> +	ov02a10->subdev.entity.function = MEDIA_ENT_F_CAM_SENSOR;
> +	ret = media_entity_pads_init(&ov02a10->subdev.entity, 1, &ov02a10->pad);
> +	if (ret < 0) {
> +		dev_err(dev, "Failed init pads\n");
> +		goto err_power_off;
> +	}
> +#endif
> +
> +	ret = v4l2_async_register_subdev(&ov02a10->subdev);
> +	if (ret) {
> +		dev_err(dev, "v4l2 async register subdev failed\n");
> +		goto err_clean_entity;
> +	}
> +
> +	pm_runtime_set_active(dev);
> +	pm_runtime_enable(dev);
> +	pm_runtime_idle(dev);
> +	dev_info(dev, "ov02a10 probe --\n");

This looks like development time leftovers; please remove.

> +
> +	return 0;
> +
> +err_clean_entity:
> +#if defined(CONFIG_MEDIA_CONTROLLER)
> +	media_entity_cleanup(&ov02a10->subdev.entity);
> +#endif

No #if needed.

> +err_power_off:
> +	__ov02a10_power_off(ov02a10);
> +err_free_handler:
> +	v4l2_ctrl_handler_free(&ov02a10->ctrl_handler);
> +err_destroy_mutex:
> +	mutex_destroy(&ov02a10->mutex);
> +
> +	return ret;
> +}
> +
> +static int ov02a10_remove(struct i2c_client *client)
> +{
> +	struct v4l2_subdev *sd = i2c_get_clientdata(client);
> +	struct ov02a10 *ov02a10 = to_ov02a10(sd);
> +
> +	v4l2_async_unregister_subdev(sd);
> +#if defined(CONFIG_MEDIA_CONTROLLER)
> +	media_entity_cleanup(&sd->entity);

No need if #if defined ... here.

> +#endif
> +	v4l2_ctrl_handler_free(&ov02a10->ctrl_handler);
> +	mutex_destroy(&ov02a10->mutex);
> +
> +	pm_runtime_disable(&client->dev);
> +	if (!pm_runtime_status_suspended(&client->dev))
> +		__ov02a10_power_off(ov02a10);
> +	pm_runtime_set_suspended(&client->dev);
> +
> +	return 0;
> +}
> +
> +#if IS_ENABLED(CONFIG_OF)
> +static const struct of_device_id ov02a10_of_match[] = {
> +	{ .compatible = "ovti,ov02a10" },
> +	{},
> +};
> +MODULE_DEVICE_TABLE(of, ov02a10_of_match);
> +#endif
> +
> +static struct i2c_driver ov02a10_i2c_driver = {
> +	.driver = {
> +		.name = "ov02a10",
> +		.pm = &ov02a10_pm_ops,
> +		.of_match_table = of_match_ptr(ov02a10_of_match),

You can omit of_match_ptr here.

> +	},
> +	.probe		= &ov02a10_probe,
> +	.remove		= &ov02a10_remove,
> +};
> +
> +module_i2c_driver(ov02a10_i2c_driver);
> +
> +MODULE_AUTHOR("Dongchun Zhu <dongchun.zhu@mediatek.com>");
> +MODULE_DESCRIPTION("OmniVision OV02A10 sensor driver");
> +MODULE_LICENSE("GPL v2");

-- 
Kind regards,

Sakari Ailus

^ permalink raw reply	[flat|nested] 14+ messages in thread

* Re: [PATCH 1/3] media: i2c: ov02a10: Add ov02a10 camera sensor driver
  2019-05-31 17:03   ` Sakari Ailus
@ 2019-06-11 14:09     ` Dongchun Zhu
  2019-06-26  9:58       ` Sakari Ailus
  0 siblings, 1 reply; 14+ messages in thread
From: Dongchun Zhu @ 2019-06-11 14:09 UTC (permalink / raw)
  To: Sakari Ailus
  Cc: mchehab, robh+dt, mark.rutland, matthias.bgg, bingbu.cao,
	srv_heupstream, linux-mediatek, linux-arm-kernel, sj.huang,
	linux-media, devicetree, louis.kuo, menghui.lin, shengnan.wang,
	tfiga

Hi Sakari,

On Fri, 2019-05-31 at 20:03 +0300, Sakari Ailus wrote:
> Hi Dongchun,
> 
> On Thu, May 23, 2019 at 06:22:02PM +0800, dongchun.zhu@mediatek.com wrote:
> > From: Dongchun Zhu <dongchun.zhu@mediatek.com>
> > 
> > Add a V4L2 sub-device driver for the OmniVision image sensor.
> > This is a camera sensor using the I2C bus for control and the
> > CSI-2 bus for data.
> > 
> > Signed-off-by: Dongchun Zhu <dongchun.zhu@mediatek.com>
> 
> Please include the Kconfig change to this patch and add a line to
> MAINTAINERS for the driver as well. The DT binding patch precedes the
> driver one, and the MAINTAINERS change goes there, too.
> 

Fixed in next release.

> > ---
> >  drivers/media/i2c/Makefile  |    1 +
> >  drivers/media/i2c/ov02a10.c | 1067 +++++++++++++++++++++++++++++++++++++++++++
> >  2 files changed, 1068 insertions(+)
> >  create mode 100644 drivers/media/i2c/ov02a10.c
> > 
> > diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
> > index d8ad9da..4b8f67b 100644
> > --- a/drivers/media/i2c/Makefile
> > +++ b/drivers/media/i2c/Makefile
> > @@ -63,6 +63,7 @@ obj-$(CONFIG_VIDEO_VP27SMPX) += vp27smpx.o
> >  obj-$(CONFIG_VIDEO_SONY_BTF_MPX) += sony-btf-mpx.o
> >  obj-$(CONFIG_VIDEO_UPD64031A) += upd64031a.o
> >  obj-$(CONFIG_VIDEO_UPD64083) += upd64083.o
> > +obj-$(CONFIG_VIDEO_OV02A10) += ov02a10.o
> >  obj-$(CONFIG_VIDEO_OV2640) += ov2640.o
> >  obj-$(CONFIG_VIDEO_OV2680) += ov2680.o
> >  obj-$(CONFIG_VIDEO_OV2685) += ov2685.o
> > diff --git a/drivers/media/i2c/ov02a10.c b/drivers/media/i2c/ov02a10.c
> > new file mode 100644
> > index 0000000..39472ff
> > --- /dev/null
> > +++ b/drivers/media/i2c/ov02a10.c
> > @@ -0,0 +1,1067 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * A V4L2 driver for OmniVision OV02A10 cameras.
> > + *
> > + * Based on Omnivision OV02A10 Camera Driver
> > + * Copyright (C) 2019 MediaTek Inc.
> > + *
> > + * This program is free software; you can redistribute it and/or
> > + * modify it under the terms of the GNU General Public License as
> > + * published by the Free Software Foundation version 2.
> > + *
> > + * This program is distributed .as is. WITHOUT ANY WARRANTY of any
> > + * kind, whether express or implied; without even the implied warranty
> > + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> > + * GNU General Public License for more details.
> > + */
> > +
> > +#include <linux/clk.h>
> > +#include <linux/device.h>
> > +#include <linux/delay.h>
> > +#include <linux/gpio/consumer.h>
> > +#include <linux/i2c.h>
> > +#include <linux/module.h>
> > +#include <linux/pm_runtime.h>
> > +#include <linux/regulator/consumer.h>
> > +#include <linux/sysfs.h>
> 
> Do you need this?
> 

Removed in next release.

> > +#include <media/media-entity.h>
> > +#include <media/v4l2-async.h>
> > +#include <media/v4l2-ctrls.h>
> > +#include <media/v4l2-subdev.h>
> > +
> > +#define CHIP_ID                                         0x2509
> > +#define OV02A10_REG_CHIP_ID_H                           0x02
> > +#define OV02A10_REG_CHIP_ID_L                           0x03
> > +#define OV02A10_ID(_msb, _lsb)                          ((_msb) << 8 | (_lsb))
> > +
> > +/* bit[1] vertical upside down */
> > +/* bit[0] horizontal mirror */
> > +#define OV02A10_REG_UPDOWN_MIRROR                       0x3F
> > +
> > +/* enable mirror & flip global effective */
> > +#define OV02A10_REG_UPDOWN_MIRROR_ENABLE                0x01
> > +
> > +#define ov02a10_XVCLK_FREQ                              24000000
> 
> The frequency goes to the DT bindings (clock-frequency property). Please
> add it. Unless the oscillator is in the sensor, which I doubt.
> 

Fixed in next release.

> > +#define REG_SC_CTRL_MODE                                0xac
> > +
> > +#define SC_CTRL_MODE_STANDBY                            0x00
> > +#define SC_CTRL_MODE_STREAMING                          0x01
> > +
> > +#define ov02a10_REG_EXPOSURE_H                          0x03
> > +#define ov02a10_REG_EXPOSURE_L                          0x04
> > +#define	ov02a10_EXPOSURE_MIN                            4
> > +#define	ov02a10_EXPOSURE_STEP                           1
> > +
> > +#define ov02a10_REG_VTS_H                               0x05
> > +#define ov02a10_REG_VTS_L                               0x06
> > +#define ov02a10_VTS_MAX                                 0x209f
> > +#define ov02a10_VTS_MIN                                 0x04cf
> > +
> > +#define ov02a10_REG_GAIN                                0x24
> > +#define ov02a10_GAIN_MIN                                0x10
> > +#define ov02a10_GAIN_MAX                                0xf8
> > +#define ov02a10_GAIN_STEP                               0x01
> > +#define ov02a10_GAIN_DEFAULT                            0x40
> > +
> > +#define ov02a10_REG_TEST_PATTERN                        0x0d
> > +#define ov02a10_TEST_PATTERN_DISABLED                   0x00
> > +#define ov02a10_TEST_PATTERN_COLOR_BAR                  0x01
> > +
> > +#define REG_NULL                                        0xFF
> > +
> > +#define ov02a10_LANES                                   1
> > +#define ov02a10_BITS_PER_SAMPLE                         10
> > +
> > +static const char * const ov02a10_supply_names[] = {
> > +	"avdd",		/* Analog power */
> > +	"dovdd",	/* Digital I/O power */
> > +	"dvdd",		/* Digital core power */
> > +};
> > +
> > +#define ov02a10_NUM_SUPPLIES ARRAY_SIZE(ov02a10_supply_names)
> > +
> > +struct regval {
> > +	u16 addr;
> > +	u8 val;
> > +};
> > +
> > +struct ov02a10_mode {
> > +	u32 width;
> > +	u32 height;
> > +	u32 exp_def;
> > +	u32 hts_def;
> > +	u32 vts_def;
> > +	const struct regval *reg_list;
> > +};
> > +
> > +struct ov02a10 {
> > +	struct i2c_client	*client;
> > +	struct clk		*xvclk;
> > +	struct gpio_desc	*pwdn_gpio;
> > +	struct gpio_desc	*reset_gpio;
> > +	struct regulator_bulk_data supplies[ov02a10_NUM_SUPPLIES];
> > +
> > +	bool			streaming;
> > +	bool			upside_down;
> > +
> > +	/*
> > +	 * Serialize control access, get/set format, get selection
> > +	 * and start streaming.
> > +	 */
> > +	struct mutex		mutex;
> > +	struct v4l2_subdev	subdev;
> > +	struct media_pad	pad;
> > +	struct v4l2_ctrl	*anal_gain;
> > +	struct v4l2_ctrl	*exposure;
> > +	struct v4l2_ctrl	*hblank;
> > +	struct v4l2_ctrl	*vblank;
> > +	struct v4l2_ctrl	*test_pattern;
> > +	struct v4l2_ctrl_handler ctrl_handler;
> > +
> > +	const struct ov02a10_mode *cur_mode;
> > +};
> > +
> > +#define to_ov02a10(sd) container_of(sd, struct ov02a10, subdev)
> > +
> > +/* test pattern output */
> > +static struct regval ov02a10_test_pattern_regs[] = {
> 
> const
> 

Fixed in next release.

> > +	{0xfd, 0x01},
> > +	{0x0d, 0x00},
> > +	{0xb6, 0x01},
> > +	{0x01, 0x01},
> > +	{0xfd, 0x01},
> > +	{0xac, 0x01},
> > +	{REG_NULL, 0x00}
> > +};
> > +
> > +/*
> > + * Xclk 24Mhz
> > + * Pclk 39Mhz
> > + * linelength 934(0x3a6)
> > + * framelength 1390(0x56E)
> > + * grabwindow_width 1600
> > + * grabwindow_height 1200
> > + * max_framerate 30fps
> > + * mipi_datarate per lane 780Mbps
> > + */
> > +static struct regval ov02a10_1600x1200_regs[] = {
> 
> Ditto.
> 

Fixed in next release.

> > +	{0xfd, 0x01},
> > +	{0xac, 0x00},
> > +	{0xfd, 0x00},
> > +	{0x2f, 0x29},
> > +	{0x34, 0x00},
> > +	{0x35, 0x21},
> > +	{0x30, 0x15},
> > +	{0x33, 0x01},
> > +	{0xfd, 0x01},
> > +	{0x44, 0x00},
> > +	{0x2a, 0x4c},
> > +	{0x2b, 0x1e},
> > +	{0x2c, 0x60},
> > +	{0x25, 0x11},
> > +	{0x03, 0x01},
> > +	{0x04, 0xae},
> > +	{0x09, 0x00},
> > +	{0x0a, 0x02},
> > +	{0x06, 0xa6},
> > +	{0x31, 0x00},
> > +	{0x24, 0x40},
> > +	{0x01, 0x01},
> > +	{0xfb, 0x73},
> > +	{0xfd, 0x01},
> > +	{0x16, 0x04},
> > +	{0x1c, 0x09},
> > +	{0x21, 0x42},
> > +	{0x12, 0x04},
> > +	{0x13, 0x10},
> > +	{0x11, 0x40},
> > +	{0x33, 0x81},
> > +	{0xd0, 0x00},
> > +	{0xd1, 0x01},
> > +	{0xd2, 0x00},
> > +	{0x50, 0x10},
> > +	{0x51, 0x23},
> > +	{0x52, 0x20},
> > +	{0x53, 0x10},
> > +	{0x54, 0x02},
> > +	{0x55, 0x20},
> > +	{0x56, 0x02},
> > +	{0x58, 0x48},
> > +	{0x5d, 0x15},
> > +	{0x5e, 0x05},
> > +	{0x66, 0x66},
> > +	{0x68, 0x68},
> > +	{0x6b, 0x00},
> > +	{0x6c, 0x00},
> > +	{0x6f, 0x40},
> > +	{0x70, 0x40},
> > +	{0x71, 0x0a},
> > +	{0x72, 0xf0},
> > +	{0x73, 0x10},
> > +	{0x75, 0x80},
> > +	{0x76, 0x10},
> > +	{0x84, 0x00},
> > +	{0x85, 0x10},
> > +	{0x86, 0x10},
> > +	{0x87, 0x00},
> > +	{0x8a, 0x22},
> > +	{0x8b, 0x22},
> > +	{0x19, 0xf1},
> > +	{0x29, 0x01},
> > +	{0xfd, 0x01},
> > +	{0x9d, 0x96},
> > +	{0xa0, 0x29},
> > +	{0xa1, 0x05},
> > +	{0xad, 0x62},
> > +	{0xae, 0x00},
> > +	{0xaf, 0x85},
> > +	{0xb1, 0x01},
> > +	{0x8e, 0x06},
> > +	{0x8f, 0x40},
> > +	{0x90, 0x04},
> > +	{0x91, 0xb0},
> > +	{0x45, 0x01},
> > +	{0x46, 0x00},
> > +	{0x47, 0x6c},
> > +	{0x48, 0x03},
> > +	{0x49, 0x8b},
> > +	{0x4a, 0x00},
> > +	{0x4b, 0x07},
> > +	{0x4c, 0x04},
> > +	{0x4d, 0xb7},
> > +	{0xf0, 0x40},
> > +	{0xf1, 0x40},
> > +	{0xf2, 0x40},
> > +	{0xf3, 0x40},
> > +	{0x3f, 0x00},
> > +	{0xfd, 0x01},
> > +	{0x05, 0x00},
> > +	{0x06, 0xa6},
> > +	{0xfd, 0x01},
> > +	{REG_NULL, 0x00}
> > +};
> > +
> > +#define ov02a10_LINK_FREQ_390MHZ		390000000
> > +static const s64 link_freq_menu_items[] = {
> > +	ov02a10_LINK_FREQ_390MHZ
> > +};
> > +
> > +static const char * const ov02a10_test_pattern_menu[] = {
> > +	"Disabled",
> > +	"Color Bar",
> > +};
> > +
> > +static const int ov02a10_test_pattern_val[] = {
> > +	ov02a10_TEST_PATTERN_DISABLED,
> > +	ov02a10_TEST_PATTERN_COLOR_BAR,
> > +};
> > +
> > +static const struct ov02a10_mode supported_modes[] = {
> > +	{
> > +		.width = 1600,
> > +		.height = 1200,
> > +		.exp_def = 0x01ae,
> > +		.hts_def = 0x03a6,
> > +		.vts_def = 0x056e,
> > +		.reg_list = ov02a10_1600x1200_regs,
> > +	},
> > +};
> > +
> > +/* write a register */
> > +static int ov02a10_write_reg(struct i2c_client *client, u8 addr, u8 val)
> > +{
> > +	u8 buf[2] = { addr, val };
> > +
> 
> Extra newline.
> 

Removed in next release.

> > +	int ret = i2c_master_send(client, buf, 2);
> 
> Please declare ret separately. This has more functionality than is good to
> put in variable declarations.
> 

Fixed in next release.

> > +
> > +	if (ret < 0) {
> > +		dev_err(&client->dev, "%s: error: reg=%x, val=%x\n",
> > +			__func__, addr, val);
> > +		return ret;
> > +	}
> > +
> > +	return ret == 2 ? 0 : ret;
> > +}
> > +
> > +static int ov02a10_write_array(struct i2c_client *client,
> > +			       const struct regval *regs)
> > +{
> > +	int ret = 0;
> 
> No need to initialise ret.
> 

Removed in next release.

> > +	u32 i;
> > +
> > +	for (i = 0; ret == 0 && regs[i].addr != REG_NULL; i++) {
> > +		ret = ov02a10_write_reg(client, regs[i].addr, regs[i].val);
> > +		if (ret < 0)
> > +			return ret;
> > +	}
> > +
> > +	return 0;
> > +}
> > +
> > +/* read a register */
> > +static int ov02a10_read_reg(struct i2c_client *client, u8 reg, u8 *val)
> > +{
> > +	int ret;
> 
> Temporary variables, return values are usually best declared as last.
> 

Fixed in next release.

> > +	u8 data = reg;
> > +	struct i2c_msg msg = {
> > +		.addr	= client->addr,
> > +		.flags	= 0,
> > +		.len	= 1,
> > +		.buf	= &data,
> > +	};
> > +
> > +	ret = i2c_transfer(client->adapter, &msg, 1);
> > +	if (ret < 0) {
> > +		dev_err(&client->dev, "i2c_transfer failed, ret %d\n", ret);
> > +		goto err;
> > +	}
> > +
> > +	msg.flags = I2C_M_RD;
> > +	ret = i2c_transfer(client->adapter, &msg, 1);
> > +	if (ret < 0) {
> > +		dev_err(&client->dev, "i2c_transfer --I2C_M_RD failed, \
> > +			ret %d\n", ret);
> > +		goto err;
> > +	}
> > +
> > +	*val = data;
> > +	return 0;
> > +
> > +err:
> > +	dev_err(&client->dev, "Failed reading register 0x%02x!\n", reg);
> > +	return ret;
> > +}
> > +
> > +static void ov02a10_fill_fmt(const struct ov02a10_mode *mode,
> > +			     struct v4l2_mbus_framefmt *fmt)
> > +{
> > +	fmt->code = MEDIA_BUS_FMT_SBGGR10_1X10;
> > +	fmt->width = mode->width;
> > +	fmt->height = mode->height;
> > +	fmt->field = V4L2_FIELD_NONE;
> > +}
> > +
> > +static int ov02a10_set_fmt(struct v4l2_subdev *sd,
> > +			   struct v4l2_subdev_pad_config *cfg,
> > +			   struct v4l2_subdev_format *fmt)
> > +{
> > +	struct ov02a10 *ov02a10 = to_ov02a10(sd);
> > +	struct v4l2_mbus_framefmt *mbus_fmt = &fmt->format;
> > +
> > +	/* only one mode supported for now */
> > +	ov02a10_fill_fmt(ov02a10->cur_mode, mbus_fmt);
> > +
> > +	return 0;
> > +}
> > +
> > +static int ov02a10_get_fmt(struct v4l2_subdev *sd,
> > +			   struct v4l2_subdev_pad_config *cfg,
> > +			   struct v4l2_subdev_format *fmt)
> > +{
> > +	struct ov02a10 *ov02a10 = to_ov02a10(sd);
> > +	struct v4l2_mbus_framefmt *mbus_fmt = &fmt->format;
> > +
> > +	ov02a10_fill_fmt(ov02a10->cur_mode, mbus_fmt);
> > +
> > +	return 0;
> > +}
> > +
> > +static int ov02a10_enum_mbus_code(struct v4l2_subdev *sd,
> > +				  struct v4l2_subdev_pad_config *cfg,
> > +				  struct v4l2_subdev_mbus_code_enum *code)
> > +{
> > +	if (code->index >= ARRAY_SIZE(supported_modes))
> 
> This isn't an enumeration supported modes but media bus formats. Therefore,
> index != 0 should yield -EINVAL.
> 

Fixed in next release.

> > +		return -EINVAL;
> > +
> > +	code->code = MEDIA_BUS_FMT_SBGGR10_1X10;
> > +
> > +	return 0;
> > +}
> > +
> > +static int ov02a10_enum_frame_sizes(struct v4l2_subdev *sd,
> > +				    struct v4l2_subdev_pad_config *cfg,
> > +				    struct v4l2_subdev_frame_size_enum *fse)
> > +{
> > +	int index = fse->index;
> > +
> > +	if (index >= ARRAY_SIZE(supported_modes))
> 
> Be sure to use use the same signedness in comparisons, especially when
> validating user input.
> 

Fixed in next release.

> > +		return -EINVAL;
> > +
> > +	fse->code = MEDIA_BUS_FMT_SBGGR10_1X10;
> 
> Instead you need check the caller set this. The frame sizes could be
> different for different media bus formats.
> 

For one sensor mode, there should be one Bayer sequence.
In next version, this para could be changed when mirror/flip enabled.

> > +
> > +	fse->min_width  = supported_modes[index].width;
> > +	fse->max_width  = supported_modes[index].width;
> > +	fse->max_height = supported_modes[index].height;
> > +	fse->min_height = supported_modes[index].height;
> > +
> > +	return 0;
> > +}
> > +
> > +static int __ov02a10_power_on(struct ov02a10 *ov02a10)
> > +{
> > +	int ret;
> > +
> 
> Please declare ret as last; no need for a newline.
> 

Fixed in next release.

> > +	struct device *dev = &ov02a10->client->dev;
> > +
> > +	ret = clk_prepare_enable(ov02a10->xvclk);
> > +	if (ret < 0) {
> > +		dev_err(dev, "Failed to enable xvclk\n");
> > +		return ret;
> > +	}
> > +
> > +	/* note: set 0 is high, set 1 is low */
> > +	gpiod_set_value_cansleep(ov02a10->reset_gpio, 1);
> > +	gpiod_set_value_cansleep(ov02a10->pwdn_gpio, 0);
> > +
> > +	ret = regulator_bulk_enable(ov02a10_NUM_SUPPLIES, ov02a10->supplies);
> > +	if (ret < 0) {
> > +		dev_err(dev, "Failed to enable regulators\n");
> > +		goto disable_clk;
> > +	}
> > +	usleep_range(7 * 1000, 8 * 1000);
> > +
> > +	gpiod_set_value_cansleep(ov02a10->pwdn_gpio, 1);
> > +	usleep_range(10 * 1000, 12 * 1000);
> > +
> > +	gpiod_set_value_cansleep(ov02a10->reset_gpio, 0);
> > +	usleep_range(10 * 1000, 12 * 1000);
> > +
> > +#ifdef SENSOR_HARDWARE_RESET
> 
> This doesn't seem to be defined. When is this needed? The reset GPIO is
> already set high previously in the function.
> 

This would be removed in next release.

> > +	/* sensor hardware reset */
> > +	gpiod_set_value_cansleep(ov02a10->reset_gpio, 1);
> > +	usleep_range(10 * 1000, 12 * 1000);
> > +	gpiod_set_value_cansleep(ov02a10->reset_gpio, 0);
> > +	usleep_range(10 * 1000, 12 * 1000);
> > +#endif
> > +
> > +	return 0;
> > +
> > +disable_clk:
> > +	clk_disable_unprepare(ov02a10->xvclk);
> > +
> > +	return ret;
> > +}
> > +
> > +static void __ov02a10_power_off(struct ov02a10 *ov02a10)
> > +{
> > +	clk_disable_unprepare(ov02a10->xvclk);
> > +	gpiod_set_value_cansleep(ov02a10->reset_gpio, 1);
> > +	gpiod_set_value_cansleep(ov02a10->pwdn_gpio, 1);
> > +	regulator_bulk_disable(ov02a10_NUM_SUPPLIES, ov02a10->supplies);
> > +}
> ~> +
> > +static int __ov02a10_start_stream(struct ov02a10 *ov02a10)
> > +{
> > +	int ret;
> > +
> > +	ret = ov02a10_write_array(ov02a10->client, ov02a10->cur_mode->reg_list);
> > +	if (ret)
> > +		return ret;
> > +
> > +	ret = __v4l2_ctrl_handler_setup(&ov02a10->ctrl_handler);
> > +	if (ret) {
> > +		pr_err("__v4l2_ctrl_handler_setup fail %d\n", ret);
> > +		return ret;
> > +	}
> > +
> > +	return ov02a10_write_reg(ov02a10->client,
> > +				 REG_SC_CTRL_MODE, SC_CTRL_MODE_STREAMING);
> > +}
> > +
> > +static int __ov02a10_stop_stream(struct ov02a10 *ov02a10)
> > +{
> > +	return ov02a10_write_reg(ov02a10->client,
> > +				 REG_SC_CTRL_MODE, SC_CTRL_MODE_STANDBY);
> > +}
> > +
> > +static int ov02a10_s_stream(struct v4l2_subdev *sd, int on)
> > +{
> > +	struct ov02a10 *ov02a10 = to_ov02a10(sd);
> > +	struct i2c_client *client = ov02a10->client;
> > +	int ret = 0;
> > +
> > +	pr_info("ov02a10 s_stream-(%d)\n", on);
> 
> Please stick to one way to print messages (dev_*, v4l2_* or pr_*); as you
> have a device, the first one would seem the proper choice. The message
> in this case also seems rather redundant.
> 

Fixed in next release.

> > +	mutex_lock(&ov02a10->mutex);
> > +
> > +	if (ov02a10->streaming == !on) {
> > +		if (on) {
> > +			ret = pm_runtime_get_sync(&client->dev);
> > +			if (ret < 0) {
> > +				pm_runtime_put_noidle(&client->dev);
> > +				goto unlock_and_return;
> > +			}
> > +
> > +			ret = __ov02a10_start_stream(ov02a10);
> > +			if (ret) {
> > +				v4l2_err(sd, "start stream failed while write regs\n");
> > +				pm_runtime_put(&client->dev);
> > +				goto unlock_and_return;
> > +			}
> > +		} else {
> > +			__ov02a10_stop_stream(ov02a10);
> > +			pm_runtime_put(&client->dev);
> > +		}
> > +
> > +		ov02a10->streaming = on;
> > +	}
> > +
> > +unlock_and_return:
> > +	mutex_unlock(&ov02a10->mutex);
> > +
> > +	return ret;
> > +}
> > +
> > +#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
> > +static int ov02a10_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
> > +{
> > +	struct ov02a10 *ov02a10 = to_ov02a10(sd);
> > +	struct v4l2_mbus_framefmt *try_fmt;
> > +
> > +	mutex_lock(&ov02a10->mutex);
> > +
> > +	try_fmt = v4l2_subdev_get_try_format(sd, fh->pad, 0);
> > +	/* Initialize try_fmt */
> > +	ov02a10_fill_fmt(&supported_modes[0], try_fmt);
> 
> If this is all you need, you should implement the init_cfg pad op.
> 

It seems that other sensors (for instance, OV8856, OV13858 etc.)
initialize try_fmt in the same way.

> > +
> > +	mutex_unlock(&ov02a10->mutex);
> > +
> > +	return 0;
> > +}
> > +#endif
> > +
> > +static int __maybe_unused ov02a10_runtime_resume(struct device *dev)
> > +{
> > +	struct i2c_client *client = to_i2c_client(dev);
> > +	struct v4l2_subdev *sd = i2c_get_clientdata(client);
> > +	struct ov02a10 *ov02a10 = to_ov02a10(sd);
> > +
> > +	return __ov02a10_power_on(ov02a10);
> > +}
> > +
> > +static int __maybe_unused ov02a10_runtime_suspend(struct device *dev)
> > +{
> > +	struct i2c_client *client = to_i2c_client(dev);
> > +	struct v4l2_subdev *sd = i2c_get_clientdata(client);
> > +	struct ov02a10 *ov02a10 = to_ov02a10(sd);
> > +
> > +	if (ov02a10->streaming == 1) {
> > +		__ov02a10_stop_stream(ov02a10);
> > +		ov02a10->streaming = 0;
> > +	}
> > +	__ov02a10_power_off(ov02a10);
> > +
> > +	return 0;
> > +}
> > +
> > +static const struct dev_pm_ops ov02a10_pm_ops = {
> > +	SET_RUNTIME_PM_OPS(ov02a10_runtime_suspend,
> > +			   ov02a10_runtime_resume, NULL)
> > +};
> > +
> > +static int ov02a10_mod_reg(struct ov02a10 *ov02a10, u16 reg,
> > +			   u8 mask, u8 val)
> > +{
> > +	u8 read_val;
> > +	int ret;
> > +
> > +	ret = ov02a10_read_reg(ov02a10->client, reg, &read_val);
> > +	if (ret)
> > +		return ret;
> > +
> > +	read_val &= ~mask;
> > +	val &= mask;
> > +	val |= read_val;
> > +
> > +	return ov02a10_write_reg(ov02a10->client, reg, val);
> > +}
> > +
> > +/* mirror & flip reg setting effective */
> > +static int ov02a10_bayer_order(struct ov02a10 *ov02a10)
> > +{
> > +	int ret;
> > +
> > +	ret = ov02a10_write_reg(ov02a10->client,
> > +				OV02A10_REG_UPDOWN_MIRROR_ENABLE,
> > +				SC_CTRL_MODE_STREAMING);
> > +	if (ret < 0)
> > +		return ret;
> > +
> > +	return 0;
> > +}
> > +
> > +static int ov02a10_set_ctrl_hflip(struct ov02a10 *ov02a10, int value)
> > +{
> > +	/*
> > +	 * If sensor is mounted upside down, mirror logic is inversed.
> > +	 *
> > +	 * Sensor is a BSI (Back Side Illuminated) one,
> > +	 * so image captured is physically mirrored.
> > +	 * This is why mirror logic is inversed in
> > +	 * order to cancel this mirror effect.
> > +	 */
> > +
> > +	/*
> > +	 * P1: 0x3F:
> > +	 * - [1]:	Vertical upside down
> > +	 * - [0]:	Horizontal mirror
> > +	 */
> > +
> > +	int ret;
> > +
> > +	ret = ov02a10_mod_reg(ov02a10, OV02A10_REG_UPDOWN_MIRROR,
> > +			      BIT(0),
> > +			      (!(value ^ ov02a10->upside_down)) ?
> > +			      BIT(0) : 0);
> > +
> > +	if (ret < 0)
> > +		return ret;
> > +
> > +	return ov02a10_bayer_order(ov02a10);
> > +}
> > +
> > +static int ov02a10_set_ctrl_vflip(struct ov02a10 *ov02a10, int value)
> > +{
> > +	/* If sensor is mounted upside down, flip logic is inversed */
> > +
> > +	/*
> > +	 * P1: 0x3F:
> > +	 * - [1]:	Vertical upside down
> > +	 * - [0]:	Horizontal mirror
> > +	 */
> > +
> > +	int ret;
> > +
> > +	ret = ov02a10_mod_reg(ov02a10, OV02A10_REG_UPDOWN_MIRROR,
> > +			      BIT(1),
> > +			      (value ^ ov02a10->upside_down) ?
> > +			      BIT(1) : 0);
> > +
> > +	if (ret < 0)
> > +		return ret;
> > +
> > +	return ov02a10_bayer_order(ov02a10);
> > +}
> > +
> > +static int ov02a10_set_test_pattern(struct ov02a10 *ov02a10, s32 value)
> > +{
> > +	int ret = 0;
> 
> ret is redundant.
> 

Fixed in next release.

> > +
> > +	if (value)
> > +		return ov02a10_write_array(ov02a10->client,
> > +					   ov02a10_test_pattern_regs);
> 
> Don't you need to disable the test pattern on the sensor if the user
> disables it?
> 

Fixed in next release.

> > +
> > +	return ret;
> > +}
> > +
> > +static int ov02a10_set_ctrl(struct v4l2_ctrl *ctrl)
> > +{
> > +	struct ov02a10 *ov02a10 = container_of(ctrl->handler,
> > +					     struct ov02a10, ctrl_handler);
> > +	struct i2c_client *client = ov02a10->client;
> > +	s64 max_expo;
> > +	int ret = 0;
> > +
> > +	/* Propagate change of current control to all related controls */
> > +	switch (ctrl->id) {
> > +	case V4L2_CID_VBLANK:
> > +		/* Update max exposure while meeting expected vblanking */
> > +		max_expo = ov02a10->cur_mode->height + ctrl->val - 4;
> > +		__v4l2_ctrl_modify_range(ov02a10->exposure,
> > +					 ov02a10->exposure->minimum, max_expo,
> > +					 ov02a10->exposure->step,
> > +					 ov02a10->exposure->default_value);
> > +		break;
> > +	}
> > +
> > +	if (pm_runtime_get_if_in_use(&client->dev) <= 0)
> > +		return 0;
> > +
> > +	switch (ctrl->id) {
> > +	case V4L2_CID_EXPOSURE:
> > +		ret = ov02a10_write_reg(client, 0xfd, 0x01);
> > +		if (ret < 0)
> > +			return ret;
> > +		ret = ov02a10_write_reg(client, ov02a10_REG_EXPOSURE_H,
> > +					((ctrl->val >> 8) & 0xFF));
> > +		if (!ret) {
> > +			ret = ov02a10_write_reg(client, ov02a10_REG_EXPOSURE_L,
> > +						(ctrl->val & 0xFF));
> > +			if (ret < 0)
> > +				return ret;
> > +		}
> > +		ret = ov02a10_write_reg(client, 0x01, 0x01);
> > +		if (ret < 0)
> > +			return ret;
> > +		break;
> > +	case V4L2_CID_ANALOGUE_GAIN:
> > +		ret = ov02a10_write_reg(client, 0xfd, 0x01);
> > +		if (ret < 0)
> > +			return ret;
> > +		ret = ov02a10_write_reg(client, ov02a10_REG_GAIN,
> > +					(ctrl->val & 0xFF));
> > +		if (ret < 0)
> > +			return ret;
> > +		ret = ov02a10_write_reg(client, 0x01, 0x01);
> > +		if (ret < 0)
> > +			return ret;
> > +		break;
> > +	case V4L2_CID_VBLANK:
> > +		ret = ov02a10_write_reg(client, 0xfd, 0x01);
> > +		if (ret < 0)
> > +			return ret;
> > +		ret = ov02a10_write_reg(client, ov02a10_REG_VTS_H,
> > +					(((ctrl->val +
> > +					ov02a10->cur_mode->height - 1224) >> 8)
> > +					& 0xFF));
> > +		if (!ret) {
> > +			ret = ov02a10_write_reg(client, ov02a10_REG_VTS_L,
> > +						((ctrl->val +
> > +						ov02a10->cur_mode->height -
> > +						1224) & 0xFF));
> > +			if (ret < 0)
> > +				return ret;
> > +		}
> > +		ret = ov02a10_write_reg(client, 0x01, 0x01);
> > +		if (ret < 0)
> > +			return ret;
> > +		break;
> > +	case V4L2_CID_TEST_PATTERN:
> > +		ret =
> > +		 ov02a10_set_test_pattern(ov02a10,
> 
> Alignment. Sometimes it could be that you don't find perfect choices, but
> usually it's a good choice to respect the indentation rules.
> 

Fixed in next release.

> > +					  ov02a10_test_pattern_val[ctrl->val]);
> > +		break;
> > +	case V4L2_CID_HFLIP:
> > +		if (ov02a10->streaming)
> > +			return -EBUSY;
> 
> You could instead use v4l2_ctrl_grab() (or the unlocked variant) when
> streaming starts. Same below.
> 

It seems that other sensors (for instance, OV2680 etc.)
call V4L2_CID_HFLIP/V4L2_CID_VFLIP in the same way.

> > +		if (ctrl->val)
> > +			ret = ov02a10_set_ctrl_hflip(ov02a10, ctrl->val);
> > +		break;
> > +	case V4L2_CID_VFLIP:
> > +		if (ov02a10->streaming)
> > +			return -EBUSY;
> > +		if (ctrl->val)
> > +			ret = ov02a10_set_ctrl_vflip(ov02a10, ctrl->val);
> > +		break;
> > +	default:
> > +		dev_warn(&client->dev, "%s Unhandled id:0x%x, val:0x%x\n",
> > +			 __func__, ctrl->id, ctrl->val);
> > +		ret = -EINVAL;
> > +		break;
> > +	};
> > +
> > +	pm_runtime_put(&client->dev);
> > +
> > +	return ret;
> > +}
> > +
> > +static const struct v4l2_subdev_video_ops ov02a10_video_ops = {
> > +	.s_stream = ov02a10_s_stream,
> > +};
> > +
> > +static const struct v4l2_subdev_pad_ops ov02a10_pad_ops = {
> > +	.enum_mbus_code = ov02a10_enum_mbus_code,
> > +	.enum_frame_size = ov02a10_enum_frame_sizes,
> > +	.get_fmt = ov02a10_get_fmt,
> > +	.set_fmt = ov02a10_set_fmt,
> > +};
> > +
> > +static const struct v4l2_subdev_ops ov02a10_subdev_ops = {
> > +	.video	= &ov02a10_video_ops,
> > +	.pad	= &ov02a10_pad_ops,
> > +};
> > +
> > +#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
> > +static const struct v4l2_subdev_internal_ops ov02a10_internal_ops = {
> > +	.open = ov02a10_open,
> > +};
> > +#endif
> > +
> > +static const struct v4l2_ctrl_ops ov02a10_ctrl_ops = {
> > +	.s_ctrl = ov02a10_set_ctrl,
> > +};
> > +
> > +static int ov02a10_initialize_controls(struct ov02a10 *ov02a10)
> > +{
> > +	const struct ov02a10_mode *mode;
> > +	struct v4l2_ctrl_handler *handler;
> > +	struct v4l2_ctrl *ctrl;
> > +	u64 exposure_max;
> > +	u32 pixel_rate, h_blank;
> > +	int ret;
> > +
> > +	handler = &ov02a10->ctrl_handler;
> > +	mode = ov02a10->cur_mode;
> > +	ret = v4l2_ctrl_handler_init(handler, 8);
> > +	if (ret)
> > +		return ret;
> > +	handler->lock = &ov02a10->mutex;
> > +
> > +	ctrl = v4l2_ctrl_new_int_menu(handler, NULL, V4L2_CID_LINK_FREQ,
> > +				      0, 0, link_freq_menu_items);
> > +	if (ctrl)
> > +		ctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY;
> > +
> > +	pixel_rate = (link_freq_menu_items[0] * 2 * ov02a10_LANES) /
> > +		     ov02a10_BITS_PER_SAMPLE;
> > +	v4l2_ctrl_new_std(handler, NULL, V4L2_CID_PIXEL_RATE,
> > +			  0, pixel_rate, 1, pixel_rate);
> > +
> > +	h_blank = mode->hts_def - mode->width;
> > +	ov02a10->hblank = v4l2_ctrl_new_std(handler, NULL, V4L2_CID_HBLANK,
> > +					    h_blank, h_blank, 1, h_blank);
> > +	if (ov02a10->hblank)
> > +		ov02a10->hblank->flags |= V4L2_CTRL_FLAG_READ_ONLY;
> > +
> > +	ov02a10->vblank = v4l2_ctrl_new_std(handler, &ov02a10_ctrl_ops,
> > +					    V4L2_CID_VBLANK, mode->vts_def -
> > +					    mode->height,
> > +					    ov02a10_VTS_MAX - mode->height, 1,
> > +					    mode->vts_def - mode->height);
> > +
> > +	exposure_max = mode->vts_def - 4;
> > +	ov02a10->exposure = v4l2_ctrl_new_std(handler, &ov02a10_ctrl_ops,
> > +					      V4L2_CID_EXPOSURE,
> > +					      ov02a10_EXPOSURE_MIN,
> > +					      exposure_max,
> > +					      ov02a10_EXPOSURE_STEP,
> > +					      mode->exp_def);
> > +
> > +	ov02a10->anal_gain = v4l2_ctrl_new_std(handler, &ov02a10_ctrl_ops,
> > +					       V4L2_CID_ANALOGUE_GAIN,
> > +					       ov02a10_GAIN_MIN,
> > +					       ov02a10_GAIN_MAX,
> > +					       ov02a10_GAIN_STEP,
> > +					       ov02a10_GAIN_DEFAULT);
> > +
> > +	ov02a10->test_pattern =
> > +	   v4l2_ctrl_new_std_menu_items(handler,
> 
> Indentation.
> 

Fixed in next release.

> > +					&ov02a10_ctrl_ops,
> > +					V4L2_CID_TEST_PATTERN,
> > +					ARRAY_SIZE(ov02a10_test_pattern_menu) -
> > +					1, 0, 0, ov02a10_test_pattern_menu);
> > +
> > +	if (handler->error) {
> > +		ret = handler->error;
> > +		dev_err(&ov02a10->client->dev,
> > +			"Failed to init controls(%d)\n", ret);
> > +		goto err_free_handler;
> > +	}
> > +
> > +	ov02a10->subdev.ctrl_handler = handler;
> > +
> > +	return 0;
> > +
> > +err_free_handler:
> > +	v4l2_ctrl_handler_free(handler);
> > +
> > +	return ret;
> > +}
> > +
> > +static int ov02a10_check_sensor_id(struct ov02a10 *ov02a10,
> > +				   struct i2c_client *client)
> > +{
> > +	struct device *dev = &ov02a10->client->dev;
> > +	u8 pid = 0;
> > +	u8 ver = 0;
> > +	int ret;
> > +
> > +	/* Check sensor revision */
> > +	ret = ov02a10_read_reg(client, OV02A10_REG_CHIP_ID_H, &pid);
> > +	if (!ret)
> > +		ret = ov02a10_read_reg(client, OV02A10_REG_CHIP_ID_L, &ver);
> > +
> > +	if (!ret) {
> 
> You could simply return the error here if there's one, and unindent the
> rest.
> 

Fixed in next release.

> > +		unsigned short id;
> 
> Please use a type of explicit size here; you have 16 bits.
> 

Fixed in next release.

> > +
> > +		id = OV02A10_ID(pid, ver);
> > +		dev_info(dev, "ov02a10_sensor id(%04x)\n", id);
> > +		if (id != CHIP_ID) {
> > +			dev_err(dev, "Unexpected sensor id(%04x), ret(%d)\n",
> > +				id, ret);
> > +			return ret;
> > +		}
> > +		dev_info(dev, "Detected OV%04X sensor\n", id);
> > +	}
> > +
> > +	return 0;
> > +}
> > +
> > +static int ov02a10_configure_regulators(struct ov02a10 *ov02a10)
> > +{
> > +	int i;
> 
> unsigned int
> 

Fixed in next release.

> > +
> > +	for (i = 0; i < ov02a10_NUM_SUPPLIES; i++)
> > +		ov02a10->supplies[i].supply = ov02a10_supply_names[i];
> > +
> > +	return devm_regulator_bulk_get(&ov02a10->client->dev,
> > +				       ov02a10_NUM_SUPPLIES,
> > +				       ov02a10->supplies);
> > +}
> > +
> > +static int ov02a10_probe(struct i2c_client *client,
> > +			 const struct i2c_device_id *id)
> 
> Use the probe_new() callback the struct i2c_driver, and you can omit the id
> table argument.
> 

Fixed in next release.

> > +{
> > +	struct device *dev = &client->dev;
> > +	struct ov02a10 *ov02a10;
> > +	u32 rotation;
> > +	int ret;
> > +
> > +	dev_info(dev, "ov02a10 probe ++\n");
> > +	ov02a10 = devm_kzalloc(dev, sizeof(*ov02a10), GFP_KERNEL);
> > +	if (!ov02a10)
> > +		return -ENOMEM;
> > +
> > +	ov02a10->client = client;
> 
> You can get client using v4l2_get_subdevdata() once you've called
> v4l2_i2c_subdev_init() below. No need for a separate field.
> 

Fixed in next release.

> > +	ov02a10->cur_mode = &supported_modes[0];
> > +
> > +	/* optional indication of physical rotation of sensor */
> > +	ret = fwnode_property_read_u32(dev_fwnode(dev), "rotation",
> > +				       &rotation);
> 
> Please add support for clock-frequency property, as discussed in my
> comments to the DT binding patch.
> 

Fixed in next release.

> > +	if (!ret) {
> > +		switch (rotation) {
> > +		case 180:
> > +			ov02a10->upside_down = true;
> > +			/* fall through */
> > +		case 0:
> > +			break;
> > +		default:
> > +			dev_warn(dev, "%u degrees rotation is not supported, ignoring...\n",
> > +				 rotation);
> > +		}
> > +	}
> > +
> > +	ov02a10->xvclk = devm_clk_get(dev, "xvclk");
> > +	if (IS_ERR(ov02a10->xvclk)) {
> > +		dev_err(dev, "Failed to get xvclk\n");
> > +		return -EINVAL;
> > +	}
> > +	ret = clk_set_rate(ov02a10->xvclk, ov02a10_XVCLK_FREQ);
> > +	if (ret < 0) {
> > +		dev_err(dev, "Failed to set xvclk rate (24MHz)\n");
> > +		return ret;
> > +	}
> > +	if (clk_get_rate(ov02a10->xvclk) != ov02a10_XVCLK_FREQ)
> > +		dev_warn(dev, "xvclk mismatched, modes are based on 24MHz\n");
> > +
> > +	ov02a10->pwdn_gpio = devm_gpiod_get(dev, "pwdn", GPIOD_OUT_LOW);
> > +	if (IS_ERR(ov02a10->pwdn_gpio)) {
> > +		dev_err(dev, "Failed to get powerdown-gpios\n");
> > +		return -EINVAL;
> > +	}
> > +
> > +	ov02a10->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
> > +	if (IS_ERR(ov02a10->reset_gpio)) {
> > +		dev_err(dev, "Failed to get reset-gpios\n");
> > +		return -EINVAL;
> > +	}
> > +
> > +	ret = ov02a10_configure_regulators(ov02a10);
> > +	if (ret) {
> > +		dev_err(dev, "Failed to get power regulators\n");
> > +		return ret;
> > +	}
> > +
> > +	mutex_init(&ov02a10->mutex);
> > +	v4l2_i2c_subdev_init(&ov02a10->subdev, client, &ov02a10_subdev_ops);
> > +	ret = ov02a10_initialize_controls(ov02a10);
> > +	if (ret) {
> > +		dev_err(dev, "Failed to initialize controls\n");
> > +		goto err_destroy_mutex;
> > +	}
> > +
> > +	ret = __ov02a10_power_on(ov02a10);
> > +	if (ret) {
> > +		dev_err(dev, "Failed to power on\n");
> > +		goto err_free_handler;
> > +	}
> > +
> > +	ret = ov02a10_check_sensor_id(ov02a10, client);
> > +	if (ret) {
> > +		dev_err(dev, "Failed to detect id, go to power off\n");
> > +		goto err_power_off;
> > +	}
> > +
> > +#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
> > +	ov02a10->subdev.internal_ops = &ov02a10_internal_ops;
> > +	ov02a10->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
> > +#endif
> > +#if defined(CONFIG_MEDIA_CONTROLLER)
> 
> I think you can put both under CONFIG_VIDEO_V4L2_SUBDEV_API;
> CONFIG_MEDIA_CONTROLLER depends on it and there's practically no use for
> MC without subdev nodes.
> 

Fixed in next release.

> > +	ov02a10->pad.flags = MEDIA_PAD_FL_SOURCE;
> > +	ov02a10->subdev.entity.function = MEDIA_ENT_F_CAM_SENSOR;
> > +	ret = media_entity_pads_init(&ov02a10->subdev.entity, 1, &ov02a10->pad);
> > +	if (ret < 0) {
> > +		dev_err(dev, "Failed init pads\n");
> > +		goto err_power_off;
> > +	}
> > +#endif
> > +
> > +	ret = v4l2_async_register_subdev(&ov02a10->subdev);
> > +	if (ret) {
> > +		dev_err(dev, "v4l2 async register subdev failed\n");
> > +		goto err_clean_entity;
> > +	}
> > +
> > +	pm_runtime_set_active(dev);
> > +	pm_runtime_enable(dev);
> > +	pm_runtime_idle(dev);
> > +	dev_info(dev, "ov02a10 probe --\n");
> 
> This looks like development time leftovers; please remove.
> 

Fixed in next release.

> > +
> > +	return 0;
> > +
> > +err_clean_entity:
> > +#if defined(CONFIG_MEDIA_CONTROLLER)
> > +	media_entity_cleanup(&ov02a10->subdev.entity);
> > +#endif
> 
> No #if needed.
> 

Fixed in next release.

> > +err_power_off:
> > +	__ov02a10_power_off(ov02a10);
> > +err_free_handler:
> > +	v4l2_ctrl_handler_free(&ov02a10->ctrl_handler);
> > +err_destroy_mutex:
> > +	mutex_destroy(&ov02a10->mutex);
> > +
> > +	return ret;
> > +}
> > +
> > +static int ov02a10_remove(struct i2c_client *client)
> > +{
> > +	struct v4l2_subdev *sd = i2c_get_clientdata(client);
> > +	struct ov02a10 *ov02a10 = to_ov02a10(sd);
> > +
> > +	v4l2_async_unregister_subdev(sd);
> > +#if defined(CONFIG_MEDIA_CONTROLLER)
> > +	media_entity_cleanup(&sd->entity);
> 
> No need if #if defined ... here.
> 

Fixed in next release.

> > +#endif
> > +	v4l2_ctrl_handler_free(&ov02a10->ctrl_handler);
> > +	mutex_destroy(&ov02a10->mutex);
> > +
> > +	pm_runtime_disable(&client->dev);
> > +	if (!pm_runtime_status_suspended(&client->dev))
> > +		__ov02a10_power_off(ov02a10);
> > +	pm_runtime_set_suspended(&client->dev);
> > +
> > +	return 0;
> > +}
> > +
> > +#if IS_ENABLED(CONFIG_OF)
> > +static const struct of_device_id ov02a10_of_match[] = {
> > +	{ .compatible = "ovti,ov02a10" },
> > +	{},
> > +};
> > +MODULE_DEVICE_TABLE(of, ov02a10_of_match);
> > +#endif
> > +
> > +static struct i2c_driver ov02a10_i2c_driver = {
> > +	.driver = {
> > +		.name = "ov02a10",
> > +		.pm = &ov02a10_pm_ops,
> > +		.of_match_table = of_match_ptr(ov02a10_of_match),
> 
> You can omit of_match_ptr here.
> 

Fixed in next release.

> > +	},
> > +	.probe		= &ov02a10_probe,
> > +	.remove		= &ov02a10_remove,
> > +};
> > +
> > +module_i2c_driver(ov02a10_i2c_driver);
> > +
> > +MODULE_AUTHOR("Dongchun Zhu <dongchun.zhu@mediatek.com>");
> > +MODULE_DESCRIPTION("OmniVision OV02A10 sensor driver");
> > +MODULE_LICENSE("GPL v2");
> 



^ permalink raw reply	[flat|nested] 14+ messages in thread

* Re: [PATCH 1/3] media: i2c: ov02a10: Add ov02a10 camera sensor driver
  2019-05-26  8:53   ` Nicolas Boichat
@ 2019-06-13  2:44     ` Dongchun Zhu
  0 siblings, 0 replies; 14+ messages in thread
From: Dongchun Zhu @ 2019-06-13  2:44 UTC (permalink / raw)
  To: Nicolas Boichat
  Cc: mchehab, Rob Herring, Mark Rutland, Matthias Brugger, bingbu.cao,
	devicetree, srv_heupstream, menghui.lin, shengnan.wang, sj.huang,
	moderated list:ARM/Mediatek SoC support, louis.kuo,
	linux-arm Mailing List, linux-media, tfiga

Hi Nicolas,

On Sun, 2019-05-26 at 16:53 +0800, Nicolas Boichat wrote:
> On Thu, May 23, 2019 at 6:22 PM <dongchun.zhu@mediatek.com> wrote:
> >
> > From: Dongchun Zhu <dongchun.zhu@mediatek.com>
> >
> > Add a V4L2 sub-device driver for the OmniVision image sensor.
> > This is a camera sensor using the I2C bus for control and the
> > CSI-2 bus for data.
> >
> > Signed-off-by: Dongchun Zhu <dongchun.zhu@mediatek.com>
> > ---
> >  drivers/media/i2c/Makefile  |    1 +
> >  drivers/media/i2c/ov02a10.c | 1067 +++++++++++++++++++++++++++++++++++++++++++
> >  2 files changed, 1068 insertions(+)
> >  create mode 100644 drivers/media/i2c/ov02a10.c
> >
> > diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
> > index d8ad9da..4b8f67b 100644
> > --- a/drivers/media/i2c/Makefile
> > +++ b/drivers/media/i2c/Makefile
> > @@ -63,6 +63,7 @@ obj-$(CONFIG_VIDEO_VP27SMPX) += vp27smpx.o
> >  obj-$(CONFIG_VIDEO_SONY_BTF_MPX) += sony-btf-mpx.o
> >  obj-$(CONFIG_VIDEO_UPD64031A) += upd64031a.o
> >  obj-$(CONFIG_VIDEO_UPD64083) += upd64083.o
> > +obj-$(CONFIG_VIDEO_OV02A10) += ov02a10.o
> >  obj-$(CONFIG_VIDEO_OV2640) += ov2640.o
> >  obj-$(CONFIG_VIDEO_OV2680) += ov2680.o
> >  obj-$(CONFIG_VIDEO_OV2685) += ov2685.o
> > diff --git a/drivers/media/i2c/ov02a10.c b/drivers/media/i2c/ov02a10.c
> > new file mode 100644
> > index 0000000..39472ff
> > --- /dev/null
> > +++ b/drivers/media/i2c/ov02a10.c
> > @@ -0,0 +1,1067 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * A V4L2 driver for OmniVision OV02A10 cameras.
> > + *
> > + * Based on Omnivision OV02A10 Camera Driver
> > + * Copyright (C) 2019 MediaTek Inc.
> > + *
> > + * This program is free software; you can redistribute it and/or
> > + * modify it under the terms of the GNU General Public License as
> > + * published by the Free Software Foundation version 2.
> > + *
> > + * This program is distributed .as is. WITHOUT ANY WARRANTY of any
> > + * kind, whether express or implied; without even the implied warranty
> > + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> > + * GNU General Public License for more details.
> > + */
> 
> This is not needed, you already have the SPDX header
> 

Fixed in next release.

> > +
> > +#include <linux/clk.h>
> > +#include <linux/device.h>
> > +#include <linux/delay.h>
> > +#include <linux/gpio/consumer.h>
> > +#include <linux/i2c.h>
> > +#include <linux/module.h>
> > +#include <linux/pm_runtime.h>
> > +#include <linux/regulator/consumer.h>
> > +#include <linux/sysfs.h>
> > +#include <media/media-entity.h>
> > +#include <media/v4l2-async.h>
> > +#include <media/v4l2-ctrls.h>
> > +#include <media/v4l2-subdev.h>
> > +
> > +#define CHIP_ID                                         0x2509
> > +#define OV02A10_REG_CHIP_ID_H                           0x02
> > +#define OV02A10_REG_CHIP_ID_L                           0x03
> > +#define OV02A10_ID(_msb, _lsb)                          ((_msb) << 8 | (_lsb))
> > +
> > +/* bit[1] vertical upside down */
> > +/* bit[0] horizontal mirror */
> > +#define OV02A10_REG_UPDOWN_MIRROR                       0x3F
> > +
> > +/* enable mirror & flip global effective */
> > +#define OV02A10_REG_UPDOWN_MIRROR_ENABLE                0x01
> 
> So according to comment above, this enables horizontal mirror only?
> 
> What about vertical upside down? Do we want to define a mask for that?
> 

Fixed in next release.

> > +
> > +#define ov02a10_XVCLK_FREQ                              24000000
> 
> Upper-case OV02A10_ prefix for all these macros.
> 

Fixed in next release.

> > +#define REG_SC_CTRL_MODE                                0xac
> > +
> > +#define SC_CTRL_MODE_STANDBY                            0x00
> > +#define SC_CTRL_MODE_STREAMING                          0x01
> > +
> > +#define ov02a10_REG_EXPOSURE_H                          0x03
> > +#define ov02a10_REG_EXPOSURE_L                          0x04
> > +#define        ov02a10_EXPOSURE_MIN                            4
> > +#define        ov02a10_EXPOSURE_STEP                           1
> > +
> > +#define ov02a10_REG_VTS_H                               0x05
> > +#define ov02a10_REG_VTS_L                               0x06
> > +#define ov02a10_VTS_MAX                                 0x209f
> > +#define ov02a10_VTS_MIN                                 0x04cf
> > +
> > +#define ov02a10_REG_GAIN                                0x24
> > +#define ov02a10_GAIN_MIN                                0x10
> > +#define ov02a10_GAIN_MAX                                0xf8
> > +#define ov02a10_GAIN_STEP                               0x01
> > +#define ov02a10_GAIN_DEFAULT                            0x40
> > +
> > +#define ov02a10_REG_TEST_PATTERN                        0x0d
> > +#define ov02a10_TEST_PATTERN_DISABLED                   0x00
> > +#define ov02a10_TEST_PATTERN_COLOR_BAR                  0x01
> > +
> > +#define REG_NULL                                        0xFF
> > +
> > +#define ov02a10_LANES                                   1
> > +#define ov02a10_BITS_PER_SAMPLE                         10
> > +
> > +static const char * const ov02a10_supply_names[] = {
> > +       "avdd",         /* Analog power */
> > +       "dovdd",        /* Digital I/O power */
> > +       "dvdd",         /* Digital core power */
> > +};
> > +
> > +#define ov02a10_NUM_SUPPLIES ARRAY_SIZE(ov02a10_supply_names)
> > +
> > +struct regval {
> > +       u16 addr;
> > +       u8 val;
> > +};
> > +
> > +struct ov02a10_mode {
> > +       u32 width;
> > +       u32 height;
> > +       u32 exp_def;
> > +       u32 hts_def;
> > +       u32 vts_def;
> > +       const struct regval *reg_list;
> > +};
> > +
> > +struct ov02a10 {
> > +       struct i2c_client       *client;
> > +       struct clk              *xvclk;
> > +       struct gpio_desc        *pwdn_gpio;
> > +       struct gpio_desc        *reset_gpio;
> > +       struct regulator_bulk_data supplies[ov02a10_NUM_SUPPLIES];
> > +
> > +       bool                    streaming;
> > +       bool                    upside_down;
> > +
> > +       /*
> > +        * Serialize control access, get/set format, get selection
> > +        * and start streaming.
> > +        */
> > +       struct mutex            mutex;
> > +       struct v4l2_subdev      subdev;
> > +       struct media_pad        pad;
> > +       struct v4l2_ctrl        *anal_gain;
> > +       struct v4l2_ctrl        *exposure;
> > +       struct v4l2_ctrl        *hblank;
> > +       struct v4l2_ctrl        *vblank;
> > +       struct v4l2_ctrl        *test_pattern;
> > +       struct v4l2_ctrl_handler ctrl_handler;
> > +
> > +       const struct ov02a10_mode *cur_mode;
> > +};
> > +
> > +#define to_ov02a10(sd) container_of(sd, struct ov02a10, subdev)
> > +
> > +/* test pattern output */
> > +static struct regval ov02a10_test_pattern_regs[] = {
> 
> const
> 

Fixed in next release.

> > +       {0xfd, 0x01},
> > +       {0x0d, 0x00},
> > +       {0xb6, 0x01},
> > +       {0x01, 0x01},
> > +       {0xfd, 0x01},
> > +       {0xac, 0x01},
> > +       {REG_NULL, 0x00}
> > +};
> > +
> > +/*
> > + * Xclk 24Mhz
> > + * Pclk 39Mhz
> > + * linelength 934(0x3a6)
> > + * framelength 1390(0x56E)
> > + * grabwindow_width 1600
> > + * grabwindow_height 1200
> > + * max_framerate 30fps
> > + * mipi_datarate per lane 780Mbps
> > + */
> > +static struct regval ov02a10_1600x1200_regs[] = {
> 
> const
> 

Fixed in next release.

> > +       {0xfd, 0x01},
> > +       {0xac, 0x00},
> > +       {0xfd, 0x00},
> > +       {0x2f, 0x29},
> > +       {0x34, 0x00},
> > +       {0x35, 0x21},
> > +       {0x30, 0x15},
> > +       {0x33, 0x01},
> > +       {0xfd, 0x01},
> > +       {0x44, 0x00},
> > +       {0x2a, 0x4c},
> > +       {0x2b, 0x1e},
> > +       {0x2c, 0x60},
> > +       {0x25, 0x11},
> > +       {0x03, 0x01},
> > +       {0x04, 0xae},
> > +       {0x09, 0x00},
> > +       {0x0a, 0x02},
> > +       {0x06, 0xa6},
> > +       {0x31, 0x00},
> > +       {0x24, 0x40},
> > +       {0x01, 0x01},
> > +       {0xfb, 0x73},
> > +       {0xfd, 0x01},
> > +       {0x16, 0x04},
> > +       {0x1c, 0x09},
> > +       {0x21, 0x42},
> > +       {0x12, 0x04},
> > +       {0x13, 0x10},
> > +       {0x11, 0x40},
> > +       {0x33, 0x81},
> > +       {0xd0, 0x00},
> > +       {0xd1, 0x01},
> > +       {0xd2, 0x00},
> > +       {0x50, 0x10},
> > +       {0x51, 0x23},
> > +       {0x52, 0x20},
> > +       {0x53, 0x10},
> > +       {0x54, 0x02},
> > +       {0x55, 0x20},
> > +       {0x56, 0x02},
> > +       {0x58, 0x48},
> > +       {0x5d, 0x15},
> > +       {0x5e, 0x05},
> > +       {0x66, 0x66},
> > +       {0x68, 0x68},
> > +       {0x6b, 0x00},
> > +       {0x6c, 0x00},
> > +       {0x6f, 0x40},
> > +       {0x70, 0x40},
> > +       {0x71, 0x0a},
> > +       {0x72, 0xf0},
> > +       {0x73, 0x10},
> > +       {0x75, 0x80},
> > +       {0x76, 0x10},
> > +       {0x84, 0x00},
> > +       {0x85, 0x10},
> > +       {0x86, 0x10},
> > +       {0x87, 0x00},
> > +       {0x8a, 0x22},
> > +       {0x8b, 0x22},
> > +       {0x19, 0xf1},
> > +       {0x29, 0x01},
> > +       {0xfd, 0x01},
> > +       {0x9d, 0x96},
> > +       {0xa0, 0x29},
> > +       {0xa1, 0x05},
> > +       {0xad, 0x62},
> > +       {0xae, 0x00},
> > +       {0xaf, 0x85},
> > +       {0xb1, 0x01},
> > +       {0x8e, 0x06},
> > +       {0x8f, 0x40},
> > +       {0x90, 0x04},
> > +       {0x91, 0xb0},
> > +       {0x45, 0x01},
> > +       {0x46, 0x00},
> > +       {0x47, 0x6c},
> > +       {0x48, 0x03},
> > +       {0x49, 0x8b},
> > +       {0x4a, 0x00},
> > +       {0x4b, 0x07},
> > +       {0x4c, 0x04},
> > +       {0x4d, 0xb7},
> > +       {0xf0, 0x40},
> > +       {0xf1, 0x40},
> > +       {0xf2, 0x40},
> > +       {0xf3, 0x40},
> > +       {0x3f, 0x00},
> > +       {0xfd, 0x01},
> > +       {0x05, 0x00},
> > +       {0x06, 0xa6},
> > +       {0xfd, 0x01},
> > +       {REG_NULL, 0x00}
> > +};
> > +
> > +#define ov02a10_LINK_FREQ_390MHZ               390000000
> > +static const s64 link_freq_menu_items[] = {
> > +       ov02a10_LINK_FREQ_390MHZ
> > +};
> > +
> > +static const char * const ov02a10_test_pattern_menu[] = {
> > +       "Disabled",
> > +       "Color Bar",
> > +};
> > +
> > +static const int ov02a10_test_pattern_val[] = {
> > +       ov02a10_TEST_PATTERN_DISABLED,
> > +       ov02a10_TEST_PATTERN_COLOR_BAR,
> > +};
> > +
> > +static const struct ov02a10_mode supported_modes[] = {
> > +       {
> > +               .width = 1600,
> > +               .height = 1200,
> > +               .exp_def = 0x01ae,
> > +               .hts_def = 0x03a6,
> > +               .vts_def = 0x056e,
> > +               .reg_list = ov02a10_1600x1200_regs,
> > +       },
> > +};
> > +
> > +/* write a register */
> > +static int ov02a10_write_reg(struct i2c_client *client, u8 addr, u8 val)
> > +{
> > +       u8 buf[2] = { addr, val };
> > +
> > +       int ret = i2c_master_send(client, buf, 2);
> > +
> > +       if (ret < 0) {
> > +               dev_err(&client->dev, "%s: error: reg=%x, val=%x\n",
> > +                       __func__, addr, val);
> > +               return ret;
> > +       }
> > +
> > +       return ret == 2 ? 0 : ret;
> 
> You want to return a negative error value if ret == 1 or ret == 0...
> (and maybe print an error message)
> 

Fixed in next release.

> > +}
> > +
> > +static int ov02a10_write_array(struct i2c_client *client,
> > +                              const struct regval *regs)
> > +{
> > +       int ret = 0;
> > +       u32 i;
> > +
> > +       for (i = 0; ret == 0 && regs[i].addr != REG_NULL; i++) {
> 
> ret == 0 test is useless, you already abort the loop. Just drop it.
> 

Fixed in next release.

> > +               ret = ov02a10_write_reg(client, regs[i].addr, regs[i].val);
> > +               if (ret < 0)
> > +                       return ret;
> > +       }
> > +
> > +       return 0;
> > +}
> > +
> > +/* read a register */
> > +static int ov02a10_read_reg(struct i2c_client *client, u8 reg, u8 *val)
> > +{
> > +       int ret;
> > +       u8 data = reg;
> > +       struct i2c_msg msg = {
> > +               .addr   = client->addr,
> > +               .flags  = 0,
> > +               .len    = 1,
> > +               .buf    = &data,
> > +       };
> > +
> > +       ret = i2c_transfer(client->adapter, &msg, 1);
> > +       if (ret < 0) {
> > +               dev_err(&client->dev, "i2c_transfer failed, ret %d\n", ret);
> > +               goto err;
> > +       }
> > +
> > +       msg.flags = I2C_M_RD;
> > +       ret = i2c_transfer(client->adapter, &msg, 1);
> > +       if (ret < 0) {
> > +               dev_err(&client->dev, "i2c_transfer --I2C_M_RD failed, \
> > +                       ret %d\n", ret);
> > +               goto err;
> > +       }
> > +
> > +       *val = data;
> > +       return 0;
> > +
> > +err:
> > +       dev_err(&client->dev, "Failed reading register 0x%02x!\n", reg);
> > +       return ret;
> > +}
> > +
> > +static void ov02a10_fill_fmt(const struct ov02a10_mode *mode,
> > +                            struct v4l2_mbus_framefmt *fmt)
> > +{
> > +       fmt->code = MEDIA_BUS_FMT_SBGGR10_1X10;
> > +       fmt->width = mode->width;
> > +       fmt->height = mode->height;
> > +       fmt->field = V4L2_FIELD_NONE;
> > +}
> > +
> > +static int ov02a10_set_fmt(struct v4l2_subdev *sd,
> > +                          struct v4l2_subdev_pad_config *cfg,
> > +                          struct v4l2_subdev_format *fmt)
> > +{
> > +       struct ov02a10 *ov02a10 = to_ov02a10(sd);
> > +       struct v4l2_mbus_framefmt *mbus_fmt = &fmt->format;
> > +
> > +       /* only one mode supported for now */
> > +       ov02a10_fill_fmt(ov02a10->cur_mode, mbus_fmt);
> > +
> > +       return 0;
> > +}
> > +
> > +static int ov02a10_get_fmt(struct v4l2_subdev *sd,
> > +                          struct v4l2_subdev_pad_config *cfg,
> > +                          struct v4l2_subdev_format *fmt)
> > +{
> > +       struct ov02a10 *ov02a10 = to_ov02a10(sd);
> > +       struct v4l2_mbus_framefmt *mbus_fmt = &fmt->format;
> > +
> > +       ov02a10_fill_fmt(ov02a10->cur_mode, mbus_fmt);
> > +
> > +       return 0;
> > +}
> > +
> > +static int ov02a10_enum_mbus_code(struct v4l2_subdev *sd,
> > +                                 struct v4l2_subdev_pad_config *cfg,
> > +                                 struct v4l2_subdev_mbus_code_enum *code)
> > +{
> > +       if (code->index >= ARRAY_SIZE(supported_modes))
> > +               return -EINVAL;
> > +
> > +       code->code = MEDIA_BUS_FMT_SBGGR10_1X10;
> > +
> > +       return 0;
> > +}
> > +
> > +static int ov02a10_enum_frame_sizes(struct v4l2_subdev *sd,
> > +                                   struct v4l2_subdev_pad_config *cfg,
> > +                                   struct v4l2_subdev_frame_size_enum *fse)
> > +{
> > +       int index = fse->index;
> 
> I'd just use fse->index below, simpler.
> 

Fixed in next release.

> > +
> > +       if (index >= ARRAY_SIZE(supported_modes))
> > +               return -EINVAL;
> > +
> > +       fse->code = MEDIA_BUS_FMT_SBGGR10_1X10;
> > +
> > +       fse->min_width  = supported_modes[index].width;
> > +       fse->max_width  = supported_modes[index].width;
> > +       fse->max_height = supported_modes[index].height;
> > +       fse->min_height = supported_modes[index].height;
> > +
> > +       return 0;
> > +}
> > +
> > +static int __ov02a10_power_on(struct ov02a10 *ov02a10)
> > +{
> > +       int ret;
> > +
> 
> Nit: No blank line here
> 

Fixed in next release.

> > +       struct device *dev = &ov02a10->client->dev;
> > +
> > +       ret = clk_prepare_enable(ov02a10->xvclk);
> > +       if (ret < 0) {
> > +               dev_err(dev, "Failed to enable xvclk\n");
> > +               return ret;
> > +       }
> > +
> > +       /* note: set 0 is high, set 1 is low */
> > +       gpiod_set_value_cansleep(ov02a10->reset_gpio, 1);
> > +       gpiod_set_value_cansleep(ov02a10->pwdn_gpio, 0);
> > +
> > +       ret = regulator_bulk_enable(ov02a10_NUM_SUPPLIES, ov02a10->supplies);
> > +       if (ret < 0) {
> > +               dev_err(dev, "Failed to enable regulators\n");
> > +               goto disable_clk;
> > +       }
> > +       usleep_range(7 * 1000, 8 * 1000);
> > +
> > +       gpiod_set_value_cansleep(ov02a10->pwdn_gpio, 1);
> > +       usleep_range(10 * 1000, 12 * 1000);
> > +
> > +       gpiod_set_value_cansleep(ov02a10->reset_gpio, 0);
> > +       usleep_range(10 * 1000, 12 * 1000);
> > +
> > +#ifdef SENSOR_HARDWARE_RESET
> 
> If we don't need this, please drop this code. Or remove the ifdef if we do.
> 

Fixed in next release.

> > +       /* sensor hardware reset */
> > +       gpiod_set_value_cansleep(ov02a10->reset_gpio, 1);
> > +       usleep_range(10 * 1000, 12 * 1000);
> > +       gpiod_set_value_cansleep(ov02a10->reset_gpio, 0);
> > +       usleep_range(10 * 1000, 12 * 1000);
> > +#endif
> > +
> > +       return 0;
> > +
> > +disable_clk:
> > +       clk_disable_unprepare(ov02a10->xvclk);
> > +
> > +       return ret;
> > +}
> > +
> > +static void __ov02a10_power_off(struct ov02a10 *ov02a10)
> > +{
> > +       clk_disable_unprepare(ov02a10->xvclk);
> > +       gpiod_set_value_cansleep(ov02a10->reset_gpio, 1);
> > +       gpiod_set_value_cansleep(ov02a10->pwdn_gpio, 1);
> > +       regulator_bulk_disable(ov02a10_NUM_SUPPLIES, ov02a10->supplies);
> > +}
> > +
> > +static int __ov02a10_start_stream(struct ov02a10 *ov02a10)
> > +{
> > +       int ret;
> > +
> > +       ret = ov02a10_write_array(ov02a10->client, ov02a10->cur_mode->reg_list);
> > +       if (ret)
> > +               return ret;
> > +
> > +       ret = __v4l2_ctrl_handler_setup(&ov02a10->ctrl_handler);
> > +       if (ret) {
> > +               pr_err("__v4l2_ctrl_handler_setup fail %d\n", ret);
> > +               return ret;
> > +       }
> > +
> > +       return ov02a10_write_reg(ov02a10->client,
> > +                                REG_SC_CTRL_MODE, SC_CTRL_MODE_STREAMING);
> > +}
> > +
> > +static int __ov02a10_stop_stream(struct ov02a10 *ov02a10)
> > +{
> > +       return ov02a10_write_reg(ov02a10->client,
> > +                                REG_SC_CTRL_MODE, SC_CTRL_MODE_STANDBY);
> > +}
> > +
> > +static int ov02a10_s_stream(struct v4l2_subdev *sd, int on)
> > +{
> > +       struct ov02a10 *ov02a10 = to_ov02a10(sd);
> > +       struct i2c_client *client = ov02a10->client;
> > +       int ret = 0;
> > +
> > +       pr_info("ov02a10 s_stream-(%d)\n", on);
> > +       mutex_lock(&ov02a10->mutex);
> > +
> > +       if (ov02a10->streaming == !on) {
> 
> You can simplify a bit by doing this, and de-indent the rest of the code:
> if (ov02a10->streaming == on)
>     goto unlock_and_return;
> 

Fixed in next release.

> > +               if (on) {
> > +                       ret = pm_runtime_get_sync(&client->dev);
> > +                       if (ret < 0) {
> > +                               pm_runtime_put_noidle(&client->dev);
> > +                               goto unlock_and_return;
> > +                       }
> > +
> > +                       ret = __ov02a10_start_stream(ov02a10);
> > +                       if (ret) {
> > +                               v4l2_err(sd, "start stream failed while write regs\n");
> > +                               pm_runtime_put(&client->dev);
> > +                               goto unlock_and_return;
> > +                       }
> > +               } else {
> > +                       __ov02a10_stop_stream(ov02a10);
> > +                       pm_runtime_put(&client->dev);
> > +               }
> > +
> > +               ov02a10->streaming = on;
> > +       }
> > +
> > +unlock_and_return:
> > +       mutex_unlock(&ov02a10->mutex);
> > +
> > +       return ret;
> > +}
> > +
> > +#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
> > +static int ov02a10_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
> > +{
> > +       struct ov02a10 *ov02a10 = to_ov02a10(sd);
> > +       struct v4l2_mbus_framefmt *try_fmt;
> > +
> > +       mutex_lock(&ov02a10->mutex);
> > +
> > +       try_fmt = v4l2_subdev_get_try_format(sd, fh->pad, 0);
> > +       /* Initialize try_fmt */
> > +       ov02a10_fill_fmt(&supported_modes[0], try_fmt);
> > +
> > +       mutex_unlock(&ov02a10->mutex);
> > +
> > +       return 0;
> > +}
> > +#endif
> > +
> > +static int __maybe_unused ov02a10_runtime_resume(struct device *dev)
> > +{
> > +       struct i2c_client *client = to_i2c_client(dev);
> > +       struct v4l2_subdev *sd = i2c_get_clientdata(client);
> > +       struct ov02a10 *ov02a10 = to_ov02a10(sd);
> > +
> > +       return __ov02a10_power_on(ov02a10);
> > +}
> > +
> > +static int __maybe_unused ov02a10_runtime_suspend(struct device *dev)
> > +{
> > +       struct i2c_client *client = to_i2c_client(dev);
> > +       struct v4l2_subdev *sd = i2c_get_clientdata(client);
> > +       struct ov02a10 *ov02a10 = to_ov02a10(sd);
> > +
> > +       if (ov02a10->streaming == 1) {
> 
> I'd drop the == 1.
> 

Fixed in next release.

> > +               __ov02a10_stop_stream(ov02a10);
> > +               ov02a10->streaming = 0;
> > +       }
> > +       __ov02a10_power_off(ov02a10);
> > +
> > +       return 0;
> > +}
> > +
> > +static const struct dev_pm_ops ov02a10_pm_ops = {
> > +       SET_RUNTIME_PM_OPS(ov02a10_runtime_suspend,
> > +                          ov02a10_runtime_resume, NULL)
> > +};
> > +
> > +static int ov02a10_mod_reg(struct ov02a10 *ov02a10, u16 reg,
> > +                          u8 mask, u8 val)
> > +{
> > +       u8 read_val;
> > +       int ret;
> > +
> > +       ret = ov02a10_read_reg(ov02a10->client, reg, &read_val);
> > +       if (ret)
> > +               return ret;
> > +
> > +       read_val &= ~mask;
> > +       val &= mask;
> > +       val |= read_val;
> > +
> > +       return ov02a10_write_reg(ov02a10->client, reg, val);
> > +}
> 
> Move this function right after the read_reg/write_reg ones.
> 

Fixed in next release.

> > +
> > +/* mirror & flip reg setting effective */
> > +static int ov02a10_bayer_order(struct ov02a10 *ov02a10)
> > +{
> > +       int ret;
> > +
> > +       ret = ov02a10_write_reg(ov02a10->client,
> > +                               OV02A10_REG_UPDOWN_MIRROR_ENABLE,
> > +                               SC_CTRL_MODE_STREAMING);
> > +       if (ret < 0)
> > +               return ret;
> > +
> > +       return 0;
> > +}
> > +
> > +static int ov02a10_set_ctrl_hflip(struct ov02a10 *ov02a10, int value)
> > +{
> > +       /*
> > +        * If sensor is mounted upside down, mirror logic is inversed.
> > +        *
> > +        * Sensor is a BSI (Back Side Illuminated) one,
> > +        * so image captured is physically mirrored.
> > +        * This is why mirror logic is inversed in
> > +        * order to cancel this mirror effect.
> > +        */
> > +
> > +       /*
> > +        * P1: 0x3F:
> > +        * - [1]:       Vertical upside down
> > +        * - [0]:       Horizontal mirror
> > +        */
> 
> This was already described above, please drop it.
> 

Fixed in next release.

> > +
> > +       int ret;
> > +
> > +       ret = ov02a10_mod_reg(ov02a10, OV02A10_REG_UPDOWN_MIRROR,
> > +                             BIT(0),
> 
> Use OV02A10_REG_UPDOWN_MIRROR_ENABLE that you defined above.
> 

Fixed in next release.

> > +                             (!(value ^ ov02a10->upside_down)) ?
> > +                             BIT(0) : 0);
> > +
> > +       if (ret < 0)
> > +               return ret;
> > +
> > +       return ov02a10_bayer_order(ov02a10);
> > +}
> > +
> > +static int ov02a10_set_ctrl_vflip(struct ov02a10 *ov02a10, int value)
> > +{
> > +       /* If sensor is mounted upside down, flip logic is inversed */
> > +
> > +       /*
> > +        * P1: 0x3F:
> > +        * - [1]:       Vertical upside down
> > +        * - [0]:       Horizontal mirror
> > +        */
> 
> ditto
> 

Fixed in next release.

> > +
> > +       int ret;
> > +
> > +       ret = ov02a10_mod_reg(ov02a10, OV02A10_REG_UPDOWN_MIRROR,
> > +                             BIT(1),
> 
> Please define a macro for this one.
> 

Fixed in next release.

> > +                             (value ^ ov02a10->upside_down) ?
> > +                             BIT(1) : 0);
> > +
> > +       if (ret < 0)
> > +               return ret;
> > +
> > +       return ov02a10_bayer_order(ov02a10);
> > +}
> > +
> > +static int ov02a10_set_test_pattern(struct ov02a10 *ov02a10, s32 value)
> > +{
> > +       int ret = 0;
> > +
> > +       if (value)
> > +               return ov02a10_write_array(ov02a10->client,
> > +                                          ov02a10_test_pattern_regs);
> > +
> > +       return ret;
> 
> Just return 0, and drop variable ret.
> 

Fixed in next release.

> > +}
> > +
> > +static int ov02a10_set_ctrl(struct v4l2_ctrl *ctrl)
> > +{
> > +       struct ov02a10 *ov02a10 = container_of(ctrl->handler,
> > +                                            struct ov02a10, ctrl_handler);
> > +       struct i2c_client *client = ov02a10->client;
> > +       s64 max_expo;
> > +       int ret = 0;
> > +
> > +       /* Propagate change of current control to all related controls */
> > +       switch (ctrl->id) {
> > +       case V4L2_CID_VBLANK:
> 
> That looks like an if (ctrl->id == V4L2_CID_VBLANK)
> 

Fixed in next release.

> > +               /* Update max exposure while meeting expected vblanking */
> > +               max_expo = ov02a10->cur_mode->height + ctrl->val - 4;
> > +               __v4l2_ctrl_modify_range(ov02a10->exposure,
> > +                                        ov02a10->exposure->minimum, max_expo,
> > +                                        ov02a10->exposure->step,
> > +                                        ov02a10->exposure->default_value);
> > +               break;
> > +       }
> > +
> > +       if (pm_runtime_get_if_in_use(&client->dev) <= 0)
> > +               return 0;
> > +
> > +       switch (ctrl->id) {
> > +       case V4L2_CID_EXPOSURE:
> > +               ret = ov02a10_write_reg(client, 0xfd, 0x01);
> 
> Please define register 0xfd, and bit 0. Same below with register 0x01.
> 

Fixed in next release.

> > +               if (ret < 0)
> > +                       return ret;
> > +               ret = ov02a10_write_reg(client, ov02a10_REG_EXPOSURE_H,
> > +                                       ((ctrl->val >> 8) & 0xFF));
> > +               if (!ret) {
> > +                       ret = ov02a10_write_reg(client, ov02a10_REG_EXPOSURE_L,
> > +                                               (ctrl->val & 0xFF));
> > +                       if (ret < 0)
> > +                               return ret;
> > +               }
> > +               ret = ov02a10_write_reg(client, 0x01, 0x01);
> > +               if (ret < 0)
> > +                       return ret;
> > +               break;
> > +       case V4L2_CID_ANALOGUE_GAIN:
> > +               ret = ov02a10_write_reg(client, 0xfd, 0x01);
> > +               if (ret < 0)
> > +                       return ret;
> > +               ret = ov02a10_write_reg(client, ov02a10_REG_GAIN,
> > +                                       (ctrl->val & 0xFF));
> > +               if (ret < 0)
> > +                       return ret;
> > +               ret = ov02a10_write_reg(client, 0x01, 0x01);
> > +               if (ret < 0)
> > +                       return ret;
> > +               break;
> > +       case V4L2_CID_VBLANK:
> > +               ret = ov02a10_write_reg(client, 0xfd, 0x01);
> > +               if (ret < 0)
> > +                       return ret;
> > +               ret = ov02a10_write_reg(client, ov02a10_REG_VTS_H,
> > +                                       (((ctrl->val +
> > +                                       ov02a10->cur_mode->height - 1224) >> 8)
> > +                                       & 0xFF));
> > +               if (!ret) {
> > +                       ret = ov02a10_write_reg(client, ov02a10_REG_VTS_L,
> > +                                               ((ctrl->val +
> > +                                               ov02a10->cur_mode->height -
> > +                                               1224) & 0xFF));
> > +                       if (ret < 0)
> > +                               return ret;
> > +               }
> > +               ret = ov02a10_write_reg(client, 0x01, 0x01);
> > +               if (ret < 0)
> > +                       return ret;
> > +               break;
> > +       case V4L2_CID_TEST_PATTERN:
> > +               ret =
> > +                ov02a10_set_test_pattern(ov02a10,
> > +                                         ov02a10_test_pattern_val[ctrl->val]);
> > +               break;
> > +       case V4L2_CID_HFLIP:
> > +               if (ov02a10->streaming)
> > +                       return -EBUSY;
> > +               if (ctrl->val)
> 
> Why? Don't we want to reset the flip if V4L2_CID_HFLIP is called with val 0?
> 

Fixed in next release.

> > +                       ret = ov02a10_set_ctrl_hflip(ov02a10, ctrl->val);
> > +               break;
> > +       case V4L2_CID_VFLIP:
> > +               if (ov02a10->streaming)
> > +                       return -EBUSY;
> > +               if (ctrl->val)
> 
> ditto
> 

Fixed in next release.

> > +                       ret = ov02a10_set_ctrl_vflip(ov02a10, ctrl->val);
> > +               break;
> > +       default:
> > +               dev_warn(&client->dev, "%s Unhandled id:0x%x, val:0x%x\n",
> > +                        __func__, ctrl->id, ctrl->val);
> > +               ret = -EINVAL;
> > +               break;
> > +       };
> > +
> > +       pm_runtime_put(&client->dev);
> > +
> > +       return ret;
> > +}
> > +
> > +static const struct v4l2_subdev_video_ops ov02a10_video_ops = {
> > +       .s_stream = ov02a10_s_stream,
> > +};
> > +
> > +static const struct v4l2_subdev_pad_ops ov02a10_pad_ops = {
> > +       .enum_mbus_code = ov02a10_enum_mbus_code,
> > +       .enum_frame_size = ov02a10_enum_frame_sizes,
> > +       .get_fmt = ov02a10_get_fmt,
> > +       .set_fmt = ov02a10_set_fmt,
> > +};
> > +
> > +static const struct v4l2_subdev_ops ov02a10_subdev_ops = {
> > +       .video  = &ov02a10_video_ops,
> > +       .pad    = &ov02a10_pad_ops,
> > +};
> > +
> > +#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
> > +static const struct v4l2_subdev_internal_ops ov02a10_internal_ops = {
> > +       .open = ov02a10_open,
> > +};
> > +#endif
> > +
> > +static const struct v4l2_ctrl_ops ov02a10_ctrl_ops = {
> > +       .s_ctrl = ov02a10_set_ctrl,
> > +};
> > +
> > +static int ov02a10_initialize_controls(struct ov02a10 *ov02a10)
> > +{
> > +       const struct ov02a10_mode *mode;
> > +       struct v4l2_ctrl_handler *handler;
> > +       struct v4l2_ctrl *ctrl;
> > +       u64 exposure_max;
> > +       u32 pixel_rate, h_blank;
> > +       int ret;
> > +
> > +       handler = &ov02a10->ctrl_handler;
> > +       mode = ov02a10->cur_mode;
> > +       ret = v4l2_ctrl_handler_init(handler, 8);
> > +       if (ret)
> > +               return ret;
> > +       handler->lock = &ov02a10->mutex;
> > +
> > +       ctrl = v4l2_ctrl_new_int_menu(handler, NULL, V4L2_CID_LINK_FREQ,
> > +                                     0, 0, link_freq_menu_items);
> > +       if (ctrl)
> > +               ctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY;
> > +
> > +       pixel_rate = (link_freq_menu_items[0] * 2 * ov02a10_LANES) /
> > +                    ov02a10_BITS_PER_SAMPLE;
> > +       v4l2_ctrl_new_std(handler, NULL, V4L2_CID_PIXEL_RATE,
> > +                         0, pixel_rate, 1, pixel_rate);
> > +
> > +       h_blank = mode->hts_def - mode->width;
> > +       ov02a10->hblank = v4l2_ctrl_new_std(handler, NULL, V4L2_CID_HBLANK,
> > +                                           h_blank, h_blank, 1, h_blank);
> > +       if (ov02a10->hblank)
> > +               ov02a10->hblank->flags |= V4L2_CTRL_FLAG_READ_ONLY;
> > +
> > +       ov02a10->vblank = v4l2_ctrl_new_std(handler, &ov02a10_ctrl_ops,
> > +                                           V4L2_CID_VBLANK, mode->vts_def -
> > +                                           mode->height,
> > +                                           ov02a10_VTS_MAX - mode->height, 1,
> > +                                           mode->vts_def - mode->height);
> > +
> > +       exposure_max = mode->vts_def - 4;
> > +       ov02a10->exposure = v4l2_ctrl_new_std(handler, &ov02a10_ctrl_ops,
> > +                                             V4L2_CID_EXPOSURE,
> > +                                             ov02a10_EXPOSURE_MIN,
> > +                                             exposure_max,
> > +                                             ov02a10_EXPOSURE_STEP,
> > +                                             mode->exp_def);
> > +
> > +       ov02a10->anal_gain = v4l2_ctrl_new_std(handler, &ov02a10_ctrl_ops,
> > +                                              V4L2_CID_ANALOGUE_GAIN,
> > +                                              ov02a10_GAIN_MIN,
> > +                                              ov02a10_GAIN_MAX,
> > +                                              ov02a10_GAIN_STEP,
> > +                                              ov02a10_GAIN_DEFAULT);
> > +
> > +       ov02a10->test_pattern =
> > +          v4l2_ctrl_new_std_menu_items(handler,
> > +                                       &ov02a10_ctrl_ops,
> > +                                       V4L2_CID_TEST_PATTERN,
> > +                                       ARRAY_SIZE(ov02a10_test_pattern_menu) -
> > +                                       1, 0, 0, ov02a10_test_pattern_menu);
> > +
> > +       if (handler->error) {
> > +               ret = handler->error;
> > +               dev_err(&ov02a10->client->dev,
> > +                       "Failed to init controls(%d)\n", ret);
> > +               goto err_free_handler;
> > +       }
> > +
> > +       ov02a10->subdev.ctrl_handler = handler;
> > +
> > +       return 0;
> > +
> > +err_free_handler:
> > +       v4l2_ctrl_handler_free(handler);
> > +
> > +       return ret;
> > +}
> > +
> > +static int ov02a10_check_sensor_id(struct ov02a10 *ov02a10,
> > +                                  struct i2c_client *client)
> > +{
> > +       struct device *dev = &ov02a10->client->dev;
> > +       u8 pid = 0;
> > +       u8 ver = 0;
> > +       int ret;
> > +
> > +       /* Check sensor revision */
> > +       ret = ov02a10_read_reg(client, OV02A10_REG_CHIP_ID_H, &pid);
> > +       if (!ret)
> 
> I'd change the error handling all over this function.
> 
> if (ret)
>    return 0;
> 

Fixed in next release.

> > +               ret = ov02a10_read_reg(client, OV02A10_REG_CHIP_ID_L, &ver);
> > +
> > +       if (!ret) {
> 
> if (ret)
>     return 0;
> 

Fixed in next release.

> > +               unsigned short id;
> > +
> > +               id = OV02A10_ID(pid, ver);
> > +               dev_info(dev, "ov02a10_sensor id(%04x)\n", id);
> 
> Drop this line, no need to print the id twice.
> 

Fixed in next release.

> > +               if (id != CHIP_ID) {
> > +                       dev_err(dev, "Unexpected sensor id(%04x), ret(%d)\n",
> > +                               id, ret);
> 
> ret always == 0 here, no need to print it.
> 

Fixed in next release.

> > +                       return ret;
> > +               }
> > +               dev_info(dev, "Detected OV%04X sensor\n", id);
> > +       }
> > +
> > +       return 0;
> > +}
> > +
> > +static int ov02a10_configure_regulators(struct ov02a10 *ov02a10)
> > +{
> > +       int i;
> > +
> > +       for (i = 0; i < ov02a10_NUM_SUPPLIES; i++)
> > +               ov02a10->supplies[i].supply = ov02a10_supply_names[i];
> > +
> > +       return devm_regulator_bulk_get(&ov02a10->client->dev,
> > +                                      ov02a10_NUM_SUPPLIES,
> > +                                      ov02a10->supplies);
> > +}
> > +
> > +static int ov02a10_probe(struct i2c_client *client,
> > +                        const struct i2c_device_id *id)
> > +{
> > +       struct device *dev = &client->dev;
> > +       struct ov02a10 *ov02a10;
> > +       u32 rotation;
> > +       int ret;
> > +
> > +       dev_info(dev, "ov02a10 probe ++\n");
> 
> Drop this
> 

Could we use dev_dbg to replace of dev_info?

> > +       ov02a10 = devm_kzalloc(dev, sizeof(*ov02a10), GFP_KERNEL);
> > +       if (!ov02a10)
> > +               return -ENOMEM;
> > +
> > +       ov02a10->client = client;
> > +       ov02a10->cur_mode = &supported_modes[0];
> > +
> > +       /* optional indication of physical rotation of sensor */
> > +       ret = fwnode_property_read_u32(dev_fwnode(dev), "rotation",
> > +                                      &rotation);
> > +       if (!ret) {
> > +               switch (rotation) {
> > +               case 180:
> > +                       ov02a10->upside_down = true;
> > +                       /* fall through */
> 
> Just break here.
> 

Fixed in next release.

> > +               case 0:
> > +                       break;
> > +               default:
> > +                       dev_warn(dev, "%u degrees rotation is not supported, ignoring...\n",
> > +                                rotation);
> > +               }
> > +       }
> > +
> > +       ov02a10->xvclk = devm_clk_get(dev, "xvclk");
> > +       if (IS_ERR(ov02a10->xvclk)) {
> > +               dev_err(dev, "Failed to get xvclk\n");
> > +               return -EINVAL;
> > +       }
> > +       ret = clk_set_rate(ov02a10->xvclk, ov02a10_XVCLK_FREQ);
> > +       if (ret < 0) {
> > +               dev_err(dev, "Failed to set xvclk rate (24MHz)\n");
> > +               return ret;
> > +       }
> > +       if (clk_get_rate(ov02a10->xvclk) != ov02a10_XVCLK_FREQ)
> > +               dev_warn(dev, "xvclk mismatched, modes are based on 24MHz\n");
> > +
> > +       ov02a10->pwdn_gpio = devm_gpiod_get(dev, "pwdn", GPIOD_OUT_LOW);
> > +       if (IS_ERR(ov02a10->pwdn_gpio)) {
> > +               dev_err(dev, "Failed to get powerdown-gpios\n");
> > +               return -EINVAL;
> > +       }
> > +
> > +       ov02a10->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
> > +       if (IS_ERR(ov02a10->reset_gpio)) {
> > +               dev_err(dev, "Failed to get reset-gpios\n");
> > +               return -EINVAL;
> > +       }
> > +
> > +       ret = ov02a10_configure_regulators(ov02a10);
> > +       if (ret) {
> > +               dev_err(dev, "Failed to get power regulators\n");
> > +               return ret;
> > +       }
> > +
> > +       mutex_init(&ov02a10->mutex);
> > +       v4l2_i2c_subdev_init(&ov02a10->subdev, client, &ov02a10_subdev_ops);
> > +       ret = ov02a10_initialize_controls(ov02a10);
> > +       if (ret) {
> > +               dev_err(dev, "Failed to initialize controls\n");
> > +               goto err_destroy_mutex;
> > +       }
> > +
> > +       ret = __ov02a10_power_on(ov02a10);
> > +       if (ret) {
> > +               dev_err(dev, "Failed to power on\n");
> 
> No need to print an error message, __ov02a10_power_on already does it.
> 

Fixed in next release.

> > +               goto err_free_handler;
> > +       }
> > +
> > +       ret = ov02a10_check_sensor_id(ov02a10, client);
> > +       if (ret) {
> > +               dev_err(dev, "Failed to detect id, go to power off\n");
> 
> No need to print an error message here, check_sensor_id already does it.
> 

Fixed in next release.

> > +               goto err_power_off;
> > +       }
> > +
> > +#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
> > +       ov02a10->subdev.internal_ops = &ov02a10_internal_ops;
> > +       ov02a10->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
> > +#endif
> > +#if defined(CONFIG_MEDIA_CONTROLLER)
> > +       ov02a10->pad.flags = MEDIA_PAD_FL_SOURCE;
> > +       ov02a10->subdev.entity.function = MEDIA_ENT_F_CAM_SENSOR;
> > +       ret = media_entity_pads_init(&ov02a10->subdev.entity, 1, &ov02a10->pad);
> > +       if (ret < 0) {
> > +               dev_err(dev, "Failed init pads\n");
> > +               goto err_power_off;
> > +       }
> > +#endif
> > +
> > +       ret = v4l2_async_register_subdev(&ov02a10->subdev);
> > +       if (ret) {
> > +               dev_err(dev, "v4l2 async register subdev failed\n");
> > +               goto err_clean_entity;
> > +       }
> > +
> > +       pm_runtime_set_active(dev);
> > +       pm_runtime_enable(dev);
> > +       pm_runtime_idle(dev);
> > +       dev_info(dev, "ov02a10 probe --\n");
> 
> Drop this.
> 

Could we use dev_dbg to replace of dev_info?

> > +
> > +       return 0;
> > +
> > +err_clean_entity:
> > +#if defined(CONFIG_MEDIA_CONTROLLER)
> > +       media_entity_cleanup(&ov02a10->subdev.entity);
> > +#endif
> > +err_power_off:
> > +       __ov02a10_power_off(ov02a10);
> > +err_free_handler:
> > +       v4l2_ctrl_handler_free(&ov02a10->ctrl_handler);
> > +err_destroy_mutex:
> > +       mutex_destroy(&ov02a10->mutex);
> > +
> > +       return ret;
> > +}
> > +
> > +static int ov02a10_remove(struct i2c_client *client)
> > +{
> > +       struct v4l2_subdev *sd = i2c_get_clientdata(client);
> > +       struct ov02a10 *ov02a10 = to_ov02a10(sd);
> > +
> > +       v4l2_async_unregister_subdev(sd);
> > +#if defined(CONFIG_MEDIA_CONTROLLER)
> > +       media_entity_cleanup(&sd->entity);
> > +#endif
> > +       v4l2_ctrl_handler_free(&ov02a10->ctrl_handler);
> > +       mutex_destroy(&ov02a10->mutex);
> > +
> > +       pm_runtime_disable(&client->dev);
> > +       if (!pm_runtime_status_suspended(&client->dev))
> > +               __ov02a10_power_off(ov02a10);
> > +       pm_runtime_set_suspended(&client->dev);
> > +
> > +       return 0;
> > +}
> > +
> > +#if IS_ENABLED(CONFIG_OF)
> > +static const struct of_device_id ov02a10_of_match[] = {
> > +       { .compatible = "ovti,ov02a10" },
> > +       {},
> > +};
> > +MODULE_DEVICE_TABLE(of, ov02a10_of_match);
> > +#endif
> > +
> > +static struct i2c_driver ov02a10_i2c_driver = {
> > +       .driver = {
> > +               .name = "ov02a10",
> > +               .pm = &ov02a10_pm_ops,
> > +               .of_match_table = of_match_ptr(ov02a10_of_match),
> > +       },
> > +       .probe          = &ov02a10_probe,
> > +       .remove         = &ov02a10_remove,
> > +};
> > +
> > +module_i2c_driver(ov02a10_i2c_driver);
> > +
> > +MODULE_AUTHOR("Dongchun Zhu <dongchun.zhu@mediatek.com>");
> > +MODULE_DESCRIPTION("OmniVision OV02A10 sensor driver");
> > +MODULE_LICENSE("GPL v2");
> > --
> > 2.9.2
> >
> >
> > _______________________________________________
> > Linux-mediatek mailing list
> > Linux-mediatek@lists.infradead.org
> > http://lists.infradead.org/mailman/listinfo/linux-mediatek



^ permalink raw reply	[flat|nested] 14+ messages in thread

* Re: [PATCH 1/3] media: i2c: ov02a10: Add ov02a10 camera sensor driver
  2019-05-28  6:20   ` Bingbu Cao
@ 2019-06-13  3:22     ` Dongchun Zhu
  0 siblings, 0 replies; 14+ messages in thread
From: Dongchun Zhu @ 2019-06-13  3:22 UTC (permalink / raw)
  To: Bingbu Cao
  Cc: mchehab, robh+dt, mark.rutland, matthias.bgg, bingbu.cao,
	srv_heupstream, linux-mediatek, linux-arm-kernel, sj.huang,
	linux-media, devicetree, louis.kuo, menghui.lin, shengnan.wang,
	tfiga

Hi Bingbu,

On Tue, 2019-05-28 at 14:20 +0800, Bingbu Cao wrote:
> 
> On 5/23/19 6:22 PM, dongchun.zhu@mediatek.com wrote:
> > From: Dongchun Zhu <dongchun.zhu@mediatek.com>
> > 
> > Add a V4L2 sub-device driver for the OmniVision image sensor.
> > This is a camera sensor using the I2C bus for control and the
> > CSI-2 bus for data.
> > 
> > Signed-off-by: Dongchun Zhu <dongchun.zhu@mediatek.com>
> > ---
> >  drivers/media/i2c/Makefile  |    1 +
> >  drivers/media/i2c/ov02a10.c | 1067 +++++++++++++++++++++++++++++++++++++++++++
> >  2 files changed, 1068 insertions(+)
> >  create mode 100644 drivers/media/i2c/ov02a10.c
> > 
> > diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
> > index d8ad9da..4b8f67b 100644
> > --- a/drivers/media/i2c/Makefile
> > +++ b/drivers/media/i2c/Makefile
> > @@ -63,6 +63,7 @@ obj-$(CONFIG_VIDEO_VP27SMPX) += vp27smpx.o
> >  obj-$(CONFIG_VIDEO_SONY_BTF_MPX) += sony-btf-mpx.o
> >  obj-$(CONFIG_VIDEO_UPD64031A) += upd64031a.o
> >  obj-$(CONFIG_VIDEO_UPD64083) += upd64083.o
> > +obj-$(CONFIG_VIDEO_OV02A10) += ov02a10.o
> >  obj-$(CONFIG_VIDEO_OV2640) += ov2640.o
> >  obj-$(CONFIG_VIDEO_OV2680) += ov2680.o
> >  obj-$(CONFIG_VIDEO_OV2685) += ov2685.o
> > diff --git a/drivers/media/i2c/ov02a10.c b/drivers/media/i2c/ov02a10.c
> > new file mode 100644
> > index 0000000..39472ff
> > --- /dev/null
> > +++ b/drivers/media/i2c/ov02a10.c
> > @@ -0,0 +1,1067 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * A V4L2 driver for OmniVision OV02A10 cameras.
> > + *
> > + * Based on Omnivision OV02A10 Camera Driver
> > + * Copyright (C) 2019 MediaTek Inc.
> > + *
> > + * This program is free software; you can redistribute it and/or
> > + * modify it under the terms of the GNU General Public License as
> > + * published by the Free Software Foundation version 2.
> > + *
> > + * This program is distributed .as is. WITHOUT ANY WARRANTY of any
> > + * kind, whether express or implied; without even the implied warranty
> > + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> > + * GNU General Public License for more details.
> > + */
> > +
> > +#include <linux/clk.h>
> > +#include <linux/device.h>
> > +#include <linux/delay.h>
> > +#include <linux/gpio/consumer.h>
> > +#include <linux/i2c.h>
> > +#include <linux/module.h>
> > +#include <linux/pm_runtime.h>
> > +#include <linux/regulator/consumer.h>
> > +#include <linux/sysfs.h>
> > +#include <media/media-entity.h>
> > +#include <media/v4l2-async.h>
> > +#include <media/v4l2-ctrls.h>
> > +#include <media/v4l2-subdev.h>
> > +
> > +#define CHIP_ID                                         0x2509
> > +#define OV02A10_REG_CHIP_ID_H                           0x02
> > +#define OV02A10_REG_CHIP_ID_L                           0x03
> > +#define OV02A10_ID(_msb, _lsb)                          ((_msb) << 8 | (_lsb))
> > +
> > +/* bit[1] vertical upside down */
> > +/* bit[0] horizontal mirror */
> > +#define OV02A10_REG_UPDOWN_MIRROR                       0x3F
> > +
> > +/* enable mirror & flip global effective */
> > +#define OV02A10_REG_UPDOWN_MIRROR_ENABLE                0x01
> > +
> > +#define ov02a10_XVCLK_FREQ                              24000000
> > +#define REG_SC_CTRL_MODE                                0xac
> > +
> > +#define SC_CTRL_MODE_STANDBY                            0x00
> > +#define SC_CTRL_MODE_STREAMING                          0x01
> > +
> > +#define ov02a10_REG_EXPOSURE_H                          0x03
> > +#define ov02a10_REG_EXPOSURE_L                          0x04
> > +#define	ov02a10_EXPOSURE_MIN                            4
> > +#define	ov02a10_EXPOSURE_STEP                           1
> > +
> > +#define ov02a10_REG_VTS_H                               0x05
> > +#define ov02a10_REG_VTS_L                               0x06
> > +#define ov02a10_VTS_MAX                                 0x209f
> > +#define ov02a10_VTS_MIN                                 0x04cf
> > +
> > +#define ov02a10_REG_GAIN                                0x24
> > +#define ov02a10_GAIN_MIN                                0x10
> > +#define ov02a10_GAIN_MAX                                0xf8
> > +#define ov02a10_GAIN_STEP                               0x01
> > +#define ov02a10_GAIN_DEFAULT                            0x40
> > +
> > +#define ov02a10_REG_TEST_PATTERN                        0x0d
> > +#define ov02a10_TEST_PATTERN_DISABLED                   0x00
> > +#define ov02a10_TEST_PATTERN_COLOR_BAR                  0x01
> > +
> > +#define REG_NULL                                        0xFF
> > +
> > +#define ov02a10_LANES                                   1
> > +#define ov02a10_BITS_PER_SAMPLE                         10
> 
> I prefer using capital letters in macro.
> 

Fixed in next release.

> > +
> > +static const char * const ov02a10_supply_names[] = {
> > +	"avdd",		/* Analog power */
> > +	"dovdd",	/* Digital I/O power */
> > +	"dvdd",		/* Digital core power */
> > +};
> > +
> > +#define ov02a10_NUM_SUPPLIES ARRAY_SIZE(ov02a10_supply_names)
> > +
> > +struct regval {
> > +	u16 addr;
> > +	u8 val;
> > +};
> > +
> > +struct ov02a10_mode {
> > +	u32 width;
> > +	u32 height;
> > +	u32 exp_def;
> > +	u32 hts_def;
> > +	u32 vts_def;
> > +	const struct regval *reg_list;
> > +};
> > +
> > +struct ov02a10 {
> > +	struct i2c_client	*client;
> > +	struct clk		*xvclk;
> > +	struct gpio_desc	*pwdn_gpio;
> > +	struct gpio_desc	*reset_gpio;
> > +	struct regulator_bulk_data supplies[ov02a10_NUM_SUPPLIES];
> > +
> > +	bool			streaming;
> > +	bool			upside_down;
> > +
> > +	/*
> > +	 * Serialize control access, get/set format, get selection
> > +	 * and start streaming.
> > +	 */
> > +	struct mutex		mutex;
> > +	struct v4l2_subdev	subdev;
> > +	struct media_pad	pad;
> > +	struct v4l2_ctrl	*anal_gain;
> > +	struct v4l2_ctrl	*exposure;
> > +	struct v4l2_ctrl	*hblank;
> > +	struct v4l2_ctrl	*vblank;
> > +	struct v4l2_ctrl	*test_pattern;
> > +	struct v4l2_ctrl_handler ctrl_handler;
> > +
> > +	const struct ov02a10_mode *cur_mode;
> > +};
> > +
> > +#define to_ov02a10(sd) container_of(sd, struct ov02a10, subdev)
> > +
> > +/* test pattern output */
> > +static struct regval ov02a10_test_pattern_regs[] = {
> > +	{0xfd, 0x01},
> > +	{0x0d, 0x00},
> > +	{0xb6, 0x01},
> > +	{0x01, 0x01},
> > +	{0xfd, 0x01},
> > +	{0xac, 0x01},
> > +	{REG_NULL, 0x00}
> > +};
> > +
> > +/*
> > + * Xclk 24Mhz
> > + * Pclk 39Mhz
> > + * linelength 934(0x3a6)
> > + * framelength 1390(0x56E)
> > + * grabwindow_width 1600
> > + * grabwindow_height 1200
> > + * max_framerate 30fps
> > + * mipi_datarate per lane 780Mbps
> > + */
> > +static struct regval ov02a10_1600x1200_regs[] = {
> > +	{0xfd, 0x01},
> > +	{0xac, 0x00},
> > +	{0xfd, 0x00},
> > +	{0x2f, 0x29},
> > +	{0x34, 0x00},
> > +	{0x35, 0x21},
> > +	{0x30, 0x15},
> > +	{0x33, 0x01},
> > +	{0xfd, 0x01},
> > +	{0x44, 0x00},
> > +	{0x2a, 0x4c},
> > +	{0x2b, 0x1e},
> > +	{0x2c, 0x60},
> > +	{0x25, 0x11},
> > +	{0x03, 0x01},
> > +	{0x04, 0xae},
> > +	{0x09, 0x00},
> > +	{0x0a, 0x02},
> > +	{0x06, 0xa6},
> > +	{0x31, 0x00},
> > +	{0x24, 0x40},
> > +	{0x01, 0x01},
> > +	{0xfb, 0x73},
> > +	{0xfd, 0x01},
> > +	{0x16, 0x04},
> > +	{0x1c, 0x09},
> > +	{0x21, 0x42},
> > +	{0x12, 0x04},
> > +	{0x13, 0x10},
> > +	{0x11, 0x40},
> > +	{0x33, 0x81},
> > +	{0xd0, 0x00},
> > +	{0xd1, 0x01},
> > +	{0xd2, 0x00},
> > +	{0x50, 0x10},
> > +	{0x51, 0x23},
> > +	{0x52, 0x20},
> > +	{0x53, 0x10},
> > +	{0x54, 0x02},
> > +	{0x55, 0x20},
> > +	{0x56, 0x02},
> > +	{0x58, 0x48},
> > +	{0x5d, 0x15},
> > +	{0x5e, 0x05},
> > +	{0x66, 0x66},
> > +	{0x68, 0x68},
> > +	{0x6b, 0x00},
> > +	{0x6c, 0x00},
> > +	{0x6f, 0x40},
> > +	{0x70, 0x40},
> > +	{0x71, 0x0a},
> > +	{0x72, 0xf0},
> > +	{0x73, 0x10},
> > +	{0x75, 0x80},
> > +	{0x76, 0x10},
> > +	{0x84, 0x00},
> > +	{0x85, 0x10},
> > +	{0x86, 0x10},
> > +	{0x87, 0x00},
> > +	{0x8a, 0x22},
> > +	{0x8b, 0x22},
> > +	{0x19, 0xf1},
> > +	{0x29, 0x01},
> > +	{0xfd, 0x01},
> > +	{0x9d, 0x96},
> > +	{0xa0, 0x29},
> > +	{0xa1, 0x05},
> > +	{0xad, 0x62},
> > +	{0xae, 0x00},
> > +	{0xaf, 0x85},
> > +	{0xb1, 0x01},
> > +	{0x8e, 0x06},
> > +	{0x8f, 0x40},
> > +	{0x90, 0x04},
> > +	{0x91, 0xb0},
> > +	{0x45, 0x01},
> > +	{0x46, 0x00},
> > +	{0x47, 0x6c},
> > +	{0x48, 0x03},
> > +	{0x49, 0x8b},
> > +	{0x4a, 0x00},
> > +	{0x4b, 0x07},
> > +	{0x4c, 0x04},
> > +	{0x4d, 0xb7},
> > +	{0xf0, 0x40},
> > +	{0xf1, 0x40},
> > +	{0xf2, 0x40},
> > +	{0xf3, 0x40},
> > +	{0x3f, 0x00},
> > +	{0xfd, 0x01},
> > +	{0x05, 0x00},
> > +	{0x06, 0xa6},
> > +	{0xfd, 0x01},
> > +	{REG_NULL, 0x00}
> > +};
> > +
> > +#define ov02a10_LINK_FREQ_390MHZ		390000000
> How about OV02A10_LINK_FREQ_390MHZ?
> 

Fixed in next release.

> > +static const s64 link_freq_menu_items[] = {
> > +	ov02a10_LINK_FREQ_390MHZ
> > +};
> > +
> > +static const char * const ov02a10_test_pattern_menu[] = {
> > +	"Disabled",
> > +	"Color Bar",
> > +};
> > +
> > +static const int ov02a10_test_pattern_val[] = {
> > +	ov02a10_TEST_PATTERN_DISABLED,
> > +	ov02a10_TEST_PATTERN_COLOR_BAR,
> > +};
> This array is not needed, as the index align with the actual pattern value.

Fixed in next release.

> > +
> > +static const struct ov02a10_mode supported_modes[] = {
> > +	{
> > +		.width = 1600,
> > +		.height = 1200,
> > +		.exp_def = 0x01ae,
> > +		.hts_def = 0x03a6,
> > +		.vts_def = 0x056e,
> > +		.reg_list = ov02a10_1600x1200_regs,
> > +	},
> > +};
> > +
> > +/* write a register */
> > +static int ov02a10_write_reg(struct i2c_client *client, u8 addr, u8 val)
> > +{
> > +	u8 buf[2] = { addr, val };
> remove extra space

Fixed in next release.

> > +
> > +	int ret = i2c_master_send(client, buf, 2);
> > +
> > +	if (ret < 0) {
> > +		dev_err(&client->dev, "%s: error: reg=%x, val=%x\n",
> > +			__func__, addr, val);
> > +		return ret;
> > +	}
> > +
> > +	return ret == 2 ? 0 : ret;
> I think it is better to return an error code instead of ret for fail case.
> > +}
> > +
> > +static int ov02a10_write_array(struct i2c_client *client,
> > +			       const struct regval *regs)
> > +{
> > +	int ret = 0;
> > +	u32 i;
> > +
> > +	for (i = 0; ret == 0 && regs[i].addr != REG_NULL; i++) {
> > +		ret = ov02a10_write_reg(client, regs[i].addr, regs[i].val);
> > +		if (ret < 0)
> > +			return ret;
> As no error message here and above, no any error message post for fail case.

Fixed in next release.

> > +	}
> > +
> > +	return 0;
> > +}
> > +
> > +/* read a register */
> > +static int ov02a10_read_reg(struct i2c_client *client, u8 reg, u8 *val)
> > +{
> > +	int ret;
> > +	u8 data = reg;
> > +	struct i2c_msg msg = {
> > +		.addr	= client->addr,
> > +		.flags	= 0,
> > +		.len	= 1,
> > +		.buf	= &data,
> > +	};
> > +
> > +	ret = i2c_transfer(client->adapter, &msg, 1);
> > +	if (ret < 0) {
> > +		dev_err(&client->dev, "i2c_transfer failed, ret %d\n", ret);
> > +		goto err;
> > +	}
> > +
> > +	msg.flags = I2C_M_RD;
> > +	ret = i2c_transfer(client->adapter, &msg, 1);
> > +	if (ret < 0) {
> > +		dev_err(&client->dev, "i2c_transfer --I2C_M_RD failed, \
> > +			ret %d\n", ret);
> Is it better squash this error message into goto?

The variable ret describes the i2c_transfer result of reading register.
If seperating the error msg to goto, then we may need to define another
one.

> > +		goto err;
> > +	}
> > +
> > +	*val = data;
> > +	return 0;
> > +
> > +err:
> > +	dev_err(&client->dev, "Failed reading register 0x%02x!\n", reg);
> > +	return ret;
> > +}
> > +
> > +static void ov02a10_fill_fmt(const struct ov02a10_mode *mode,
> > +			     struct v4l2_mbus_framefmt *fmt)
> > +{
> > +	fmt->code = MEDIA_BUS_FMT_SBGGR10_1X10;
> > +	fmt->width = mode->width;
> > +	fmt->height = mode->height;
> > +	fmt->field = V4L2_FIELD_NONE;
> > +}
> > +
> > +static int ov02a10_set_fmt(struct v4l2_subdev *sd,
> > +			   struct v4l2_subdev_pad_config *cfg,
> > +			   struct v4l2_subdev_format *fmt)
> > +{
> > +	struct ov02a10 *ov02a10 = to_ov02a10(sd);
> > +	struct v4l2_mbus_framefmt *mbus_fmt = &fmt->format;
> > +
> > +	/* only one mode supported for now */
> > +	ov02a10_fill_fmt(ov02a10->cur_mode, mbus_fmt);
> > +
> > +	return 0;
> > +}
> > +
> > +static int ov02a10_get_fmt(struct v4l2_subdev *sd,
> > +			   struct v4l2_subdev_pad_config *cfg,
> > +			   struct v4l2_subdev_format *fmt)
> > +{
> > +	struct ov02a10 *ov02a10 = to_ov02a10(sd);
> > +	struct v4l2_mbus_framefmt *mbus_fmt = &fmt->format;
> > +
> > +	ov02a10_fill_fmt(ov02a10->cur_mode, mbus_fmt);
> > +
> > +	return 0;
> > +}
> > +
> > +static int ov02a10_enum_mbus_code(struct v4l2_subdev *sd,
> > +				  struct v4l2_subdev_pad_config *cfg,
> > +				  struct v4l2_subdev_mbus_code_enum *code)
> > +{
> > +	if (code->index >= ARRAY_SIZE(supported_modes))
> > +		return -EINVAL;
> > +
> > +	code->code = MEDIA_BUS_FMT_SBGGR10_1X10;
> > +
> > +	return 0;
> > +}
> > +
> > +static int ov02a10_enum_frame_sizes(struct v4l2_subdev *sd,
> > +				    struct v4l2_subdev_pad_config *cfg,
> > +				    struct v4l2_subdev_frame_size_enum *fse)
> > +{
> > +	int index = fse->index;
> > +
> > +	if (index >= ARRAY_SIZE(supported_modes))
> > +		return -EINVAL;
> > +
> > +	fse->code = MEDIA_BUS_FMT_SBGGR10_1X10;
> > +
> > +	fse->min_width  = supported_modes[index].width;
> > +	fse->max_width  = supported_modes[index].width;
> > +	fse->max_height = supported_modes[index].height;
> > +	fse->min_height = supported_modes[index].height;
> > +
> > +	return 0;
> > +}
> > +
> > +static int __ov02a10_power_on(struct ov02a10 *ov02a10)
> > +{
> > +	int ret;
> > +
> > +	struct device *dev = &ov02a10->client->dev;
> > +
> > +	ret = clk_prepare_enable(ov02a10->xvclk);
> > +	if (ret < 0) {
> > +		dev_err(dev, "Failed to enable xvclk\n");
> > +		return ret;
> > +	}
> > +
> > +	/* note: set 0 is high, set 1 is low */
> > +	gpiod_set_value_cansleep(ov02a10->reset_gpio, 1);
> > +	gpiod_set_value_cansleep(ov02a10->pwdn_gpio, 0);
> > +
> > +	ret = regulator_bulk_enable(ov02a10_NUM_SUPPLIES, ov02a10->supplies);
> > +	if (ret < 0) {
> > +		dev_err(dev, "Failed to enable regulators\n");
> > +		goto disable_clk;
> > +	}
> > +	usleep_range(7 * 1000, 8 * 1000);
> > +
> > +	gpiod_set_value_cansleep(ov02a10->pwdn_gpio, 1);
> > +	usleep_range(10 * 1000, 12 * 1000);
> > +
> > +	gpiod_set_value_cansleep(ov02a10->reset_gpio, 0);
> > +	usleep_range(10 * 1000, 12 * 1000);
> > +
> > +#ifdef SENSOR_HARDWARE_RESET
> what is the purpose this macro? My understanding - if reset_gpio is not
> NULL, driver should do hardware reset.

Sorry that this is hardware reset mechanism. Here we didn't use it.
This would be fixed in next release.

> > +	/* sensor hardware reset */
> > +	gpiod_set_value_cansleep(ov02a10->reset_gpio, 1);
> > +	usleep_range(10 * 1000, 12 * 1000);
> > +	gpiod_set_value_cansleep(ov02a10->reset_gpio, 0);
> > +	usleep_range(10 * 1000, 12 * 1000);
> > +#endif
> > +
> Could you clean up the usleep_range value here? If you want to need
> bigger sleep, you can use msleep.

Fixed in next release.

> > +	return 0;
> > +
> > +disable_clk:
> > +	clk_disable_unprepare(ov02a10->xvclk);
> > +
> > +	return ret;
> > +}
> > +
> > +static void __ov02a10_power_off(struct ov02a10 *ov02a10)
> > +{
> > +	clk_disable_unprepare(ov02a10->xvclk);
> > +	gpiod_set_value_cansleep(ov02a10->reset_gpio, 1);
> > +	gpiod_set_value_cansleep(ov02a10->pwdn_gpio, 1);
> > +	regulator_bulk_disable(ov02a10_NUM_SUPPLIES, ov02a10->supplies);
> > +}
> > +
> > +static int __ov02a10_start_stream(struct ov02a10 *ov02a10)
> > +{
> > +	int ret;
> > +
> > +	ret = ov02a10_write_array(ov02a10->client, ov02a10->cur_mode->reg_list);
> > +	if (ret)
> > +		return ret;
> > +
> > +	ret = __v4l2_ctrl_handler_setup(&ov02a10->ctrl_handler);
> > +	if (ret) {
> > +		pr_err("__v4l2_ctrl_handler_setup fail %d\n", ret);
> dev_err?

Fixed in next release.

> > +		return ret;
> > +	}
> > +
> > +	return ov02a10_write_reg(ov02a10->client,
> > +				 REG_SC_CTRL_MODE, SC_CTRL_MODE_STREAMING);
> > +}
> > +
> > +static int __ov02a10_stop_stream(struct ov02a10 *ov02a10)
> > +{
> > +	return ov02a10_write_reg(ov02a10->client,
> > +				 REG_SC_CTRL_MODE, SC_CTRL_MODE_STANDBY);
> > +}
> > +
> > +static int ov02a10_s_stream(struct v4l2_subdev *sd, int on)
> > +{
> > +	struct ov02a10 *ov02a10 = to_ov02a10(sd);
> > +	struct i2c_client *client = ov02a10->client;
> > +	int ret = 0;
> > +
> > +	pr_info("ov02a10 s_stream-(%d)\n", on);
> remove this debug info, or use dev_dbg?
> > +	mutex_lock(&ov02a10->mutex);
> > +
> > +	if (ov02a10->streaming == !on) {
> You can runtime pm interface to check the power status.
> And I suggest use:
> if (on) {
> 	...
> 	return 0;
> }
> 
> /*stream off */
> ...
> 

Thanks for kind suggestions. Fixed in next release.

> > +		if (on) {
> > +			ret = pm_runtime_get_sync(&client->dev);
> > +			if (ret < 0) {
> > +				pm_runtime_put_noidle(&client->dev);
> > +				goto unlock_and_return;
> > +			}
> > +
> > +			ret = __ov02a10_start_stream(ov02a10);
> > +			if (ret) {
> > +				v4l2_err(sd, "start stream failed while write regs\n");
> > +				pm_runtime_put(&client->dev);
> > +				goto unlock_and_return;
> > +			}
> > +		} else {
> > +			__ov02a10_stop_stream(ov02a10);
> > +			pm_runtime_put(&client->dev);
> > +		}
> > +
> > +		ov02a10->streaming = on;
> > +	}
> > +
> > +unlock_and_return:
> > +	mutex_unlock(&ov02a10->mutex);
> > +
> > +	return ret;
> > +}
> > +
> > +#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
> > +static int ov02a10_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
> > +{
> > +	struct ov02a10 *ov02a10 = to_ov02a10(sd);
> > +	struct v4l2_mbus_framefmt *try_fmt;
> > +
> > +	mutex_lock(&ov02a10->mutex);
> > +
> > +	try_fmt = v4l2_subdev_get_try_format(sd, fh->pad, 0);
> > +	/* Initialize try_fmt */
> > +	ov02a10_fill_fmt(&supported_modes[0], try_fmt);
> > +
> > +	mutex_unlock(&ov02a10->mutex);
> > +
> > +	return 0;
> > +}
> > +#endif
> > +
> > +static int __maybe_unused ov02a10_runtime_resume(struct device *dev)
> > +{
> > +	struct i2c_client *client = to_i2c_client(dev);
> > +	struct v4l2_subdev *sd = i2c_get_clientdata(client);
> > +	struct ov02a10 *ov02a10 = to_ov02a10(sd);
> > +
> > +	return __ov02a10_power_on(ov02a10);
> > +}
> > +
> > +static int __maybe_unused ov02a10_runtime_suspend(struct device *dev)
> > +{
> > +	struct i2c_client *client = to_i2c_client(dev);
> > +	struct v4l2_subdev *sd = i2c_get_clientdata(client);
> > +	struct ov02a10 *ov02a10 = to_ov02a10(sd);
> > +
> > +	if (ov02a10->streaming == 1) {
> > +		__ov02a10_stop_stream(ov02a10);
> Why not use ov02a10_s_stream?

This func is to suspend, thus we need to stop streaming.
And __ov02a10_stop_stream interface is also called by ov02a10_s_stream.

> > +		ov02a10->streaming = 0;
> > +	}
> > +	__ov02a10_power_off(ov02a10);
> > +
> > +	return 0;
> > +}
> > +
> > +static const struct dev_pm_ops ov02a10_pm_ops = {
> > +	SET_RUNTIME_PM_OPS(ov02a10_runtime_suspend,
> > +			   ov02a10_runtime_resume, NULL)
> > +};
> > +
> > +static int ov02a10_mod_reg(struct ov02a10 *ov02a10, u16 reg,
> > +			   u8 mask, u8 val)
> indent issue
> 

Fixed in next release.

> > +{
> > +	u8 read_val;
> > +	int ret;
> > +
> > +	ret = ov02a10_read_reg(ov02a10->client, reg, &read_val);
> > +	if (ret)
> > +		return ret;
> > +
> > +	read_val &= ~mask;
> > +	val &= mask;
> > +	val |= read_val;
> > +
> > +	return ov02a10_write_reg(ov02a10->client, reg, val);
> > +}
> > +
> > +/* mirror & flip reg setting effective */
> > +static int ov02a10_bayer_order(struct ov02a10 *ov02a10)
> > +{
> > +	int ret;
> > +
> > +	ret = ov02a10_write_reg(ov02a10->client,
> > +				OV02A10_REG_UPDOWN_MIRROR_ENABLE,
> > +				SC_CTRL_MODE_STREAMING);
> 
> SC_CTRL_MODE_STRAMING? Is it correct?
> 

Fixed in next release.

> > +	if (ret < 0)
> > +		return ret;
> > +
> > +	return 0;
> > +}
> > +
> > +static int ov02a10_set_ctrl_hflip(struct ov02a10 *ov02a10, int value)
> > +{
> > +	/*
> > +	 * If sensor is mounted upside down, mirror logic is inversed.
> > +	 *
> > +	 * Sensor is a BSI (Back Side Illuminated) one,
> > +	 * so image captured is physically mirrored.
> > +	 * This is why mirror logic is inversed in
> > +	 * order to cancel this mirror effect.
> > +	 */
> > +
> > +	/*
> > +	 * P1: 0x3F:
> > +	 * - [1]:	Vertical upside down
> > +	 * - [0]:	Horizontal mirror
> > +	 */
> Move this comment above?

Fixed in next release.

> > +
> > +	int ret;
> > +
> > +	ret = ov02a10_mod_reg(ov02a10, OV02A10_REG_UPDOWN_MIRROR,
> > +			      BIT(0),
> > +			      (!(value ^ ov02a10->upside_down)) ?
> > +			      BIT(0) : 0);
> > +
> > +	if (ret < 0)
> > +		return ret;
> > +
> > +	return ov02a10_bayer_order(ov02a10);
> > +}
> > +
> > +static int ov02a10_set_ctrl_vflip(struct ov02a10 *ov02a10, int value)
> > +{
> > +	/* If sensor is mounted upside down, flip logic is inversed */
> > +
> > +	/*
> > +	 * P1: 0x3F:
> > +	 * - [1]:	Vertical upside down
> > +	 * - [0]:	Horizontal mirror
> > +	 */
> Same as above.

Fixed in next release.

> > +
> > +	int ret;
> > +
> > +	ret = ov02a10_mod_reg(ov02a10, OV02A10_REG_UPDOWN_MIRROR,
> > +			      BIT(1),
> > +			      (value ^ ov02a10->upside_down) ?
> > +			      BIT(1) : 0);
> > +
> > +	if (ret < 0)
> > +		return ret;
> > +
> > +	return ov02a10_bayer_order(ov02a10);
> > +}
> > +
> > +static int ov02a10_set_test_pattern(struct ov02a10 *ov02a10, s32 value)
> > +{
> > +	int ret = 0;
> > +
> > +	if (value)
> > +		return ov02a10_write_array(ov02a10->client,
> > +					   ov02a10_test_pattern_regs);
> > +
> > +	return ret;
> > +}
> > +
> > +static int ov02a10_set_ctrl(struct v4l2_ctrl *ctrl)
> > +{
> > +	struct ov02a10 *ov02a10 = container_of(ctrl->handler,
> > +					     struct ov02a10, ctrl_handler);
> > +	struct i2c_client *client = ov02a10->client;
> > +	s64 max_expo;
> > +	int ret = 0;
> > +
> > +	/* Propagate change of current control to all related controls */
> > +	switch (ctrl->id) {
> > +	case V4L2_CID_VBLANK:
> > +		/* Update max exposure while meeting expected vblanking */
> > +		max_expo = ov02a10->cur_mode->height + ctrl->val - 4;
> > +		__v4l2_ctrl_modify_range(ov02a10->exposure,
> > +					 ov02a10->exposure->minimum, max_expo,
> > +					 ov02a10->exposure->step,
> > +					 ov02a10->exposure->default_value);
> > +		break;
> > +	}
> > +
> > +	if (pm_runtime_get_if_in_use(&client->dev) <= 0)
> > +		return 0;
> > +
> > +	switch (ctrl->id) {
> > +	case V4L2_CID_EXPOSURE:
> > +		ret = ov02a10_write_reg(client, 0xfd, 0x01);
> > +		if (ret < 0)
> > +			return ret;
> > +		ret = ov02a10_write_reg(client, ov02a10_REG_EXPOSURE_H,
> > +					((ctrl->val >> 8) & 0xFF));
> > +		if (!ret) {
> > +			ret = ov02a10_write_reg(client, ov02a10_REG_EXPOSURE_L,
> > +						(ctrl->val & 0xFF));
> > +			if (ret < 0)
> > +				return ret;
> > +		}
> > +		ret = ov02a10_write_reg(client, 0x01, 0x01);
> > +		if (ret < 0)
> > +			return ret;
> > +		break;
> > +	case V4L2_CID_ANALOGUE_GAIN:
> > +		ret = ov02a10_write_reg(client, 0xfd, 0x01);
> > +		if (ret < 0)
> > +			return ret;
> > +		ret = ov02a10_write_reg(client, ov02a10_REG_GAIN,
> > +					(ctrl->val & 0xFF));
> > +		if (ret < 0)
> > +			return ret;
> > +		ret = ov02a10_write_reg(client, 0x01, 0x01);
> > +		if (ret < 0)
> > +			return ret;
> > +		break;
> > +	case V4L2_CID_VBLANK:
> > +		ret = ov02a10_write_reg(client, 0xfd, 0x01);
> > +		if (ret < 0)
> > +			return ret;
> > +		ret = ov02a10_write_reg(client, ov02a10_REG_VTS_H,
> > +					(((ctrl->val +
> > +					ov02a10->cur_mode->height - 1224) >> 8)
> > +					& 0xFF));
> > +		if (!ret) {
> > +			ret = ov02a10_write_reg(client, ov02a10_REG_VTS_L,
> > +						((ctrl->val +
> > +						ov02a10->cur_mode->height -
> > +						1224) & 0xFF));
> > +			if (ret < 0)
> > +				return ret;
> > +		}
> > +		ret = ov02a10_write_reg(client, 0x01, 0x01);
> > +		if (ret < 0)
> > +			return ret;
> > +		break;
> > +	case V4L2_CID_TEST_PATTERN:
> > +		ret =
> > +		 ov02a10_set_test_pattern(ov02a10,
> > +					  ov02a10_test_pattern_val[ctrl->val]);
> As comment above, you can use ctrl->val directly.

Fixed in next release.

> > +		break;
> > +	case V4L2_CID_HFLIP:
> > +		if (ov02a10->streaming)
> > +			return -EBUSY;
> > +		if (ctrl->val)
> > +			ret = ov02a10_set_ctrl_hflip(ov02a10, ctrl->val);
> > +		break;
> > +	case V4L2_CID_VFLIP:
> > +		if (ov02a10->streaming)
> > +			return -EBUSY;
> > +		if (ctrl->val)
> > +			ret = ov02a10_set_ctrl_vflip(ov02a10, ctrl->val);
> > +		break;
> > +	default:
> > +		dev_warn(&client->dev, "%s Unhandled id:0x%x, val:0x%x\n",
> > +			 __func__, ctrl->id, ctrl->val);
> > +		ret = -EINVAL;
> > +		break;
> > +	};
> > +
> > +	pm_runtime_put(&client->dev);
> > +
> > +	return ret;
> > +}
> > +
> > +static const struct v4l2_subdev_video_ops ov02a10_video_ops = {
> > +	.s_stream = ov02a10_s_stream,
> > +};
> > +
> > +static const struct v4l2_subdev_pad_ops ov02a10_pad_ops = {
> > +	.enum_mbus_code = ov02a10_enum_mbus_code,
> > +	.enum_frame_size = ov02a10_enum_frame_sizes,
> > +	.get_fmt = ov02a10_get_fmt,
> > +	.set_fmt = ov02a10_set_fmt,
> > +};
> > +
> > +static const struct v4l2_subdev_ops ov02a10_subdev_ops = {
> > +	.video	= &ov02a10_video_ops,
> > +	.pad	= &ov02a10_pad_ops,
> > +};
> > +
> > +#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
> > +static const struct v4l2_subdev_internal_ops ov02a10_internal_ops = {
> > +	.open = ov02a10_open,
> > +};
> > +#endif
> > +
> > +static const struct v4l2_ctrl_ops ov02a10_ctrl_ops = {
> > +	.s_ctrl = ov02a10_set_ctrl,
> > +};
> > +
> > +static int ov02a10_initialize_controls(struct ov02a10 *ov02a10)
> > +{
> > +	const struct ov02a10_mode *mode;
> > +	struct v4l2_ctrl_handler *handler;
> > +	struct v4l2_ctrl *ctrl;
> > +	u64 exposure_max;
> > +	u32 pixel_rate, h_blank;
> > +	int ret;
> > +
> > +	handler = &ov02a10->ctrl_handler;
> > +	mode = ov02a10->cur_mode;
> > +	ret = v4l2_ctrl_handler_init(handler, 8);
> > +	if (ret)
> > +		return ret;
> > +	handler->lock = &ov02a10->mutex;
> > +
> > +	ctrl = v4l2_ctrl_new_int_menu(handler, NULL, V4L2_CID_LINK_FREQ,
> > +				      0, 0, link_freq_menu_items);
> > +	if (ctrl)
> > +		ctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY;
> > +
> > +	pixel_rate = (link_freq_menu_items[0] * 2 * ov02a10_LANES) /
> > +		     ov02a10_BITS_PER_SAMPLE;
> > +	v4l2_ctrl_new_std(handler, NULL, V4L2_CID_PIXEL_RATE,
> > +			  0, pixel_rate, 1, pixel_rate);
> > +
> > +	h_blank = mode->hts_def - mode->width;
> > +	ov02a10->hblank = v4l2_ctrl_new_std(handler, NULL, V4L2_CID_HBLANK,
> > +					    h_blank, h_blank, 1, h_blank);
> > +	if (ov02a10->hblank)
> > +		ov02a10->hblank->flags |= V4L2_CTRL_FLAG_READ_ONLY;
> > +
> > +	ov02a10->vblank = v4l2_ctrl_new_std(handler, &ov02a10_ctrl_ops,
> > +					    V4L2_CID_VBLANK, mode->vts_def -
> > +					    mode->height,
> > +					    ov02a10_VTS_MAX - mode->height, 1,
> > +					    mode->vts_def - mode->height);
> > +
> > +	exposure_max = mode->vts_def - 4;
> > +	ov02a10->exposure = v4l2_ctrl_new_std(handler, &ov02a10_ctrl_ops,
> > +					      V4L2_CID_EXPOSURE,
> > +					      ov02a10_EXPOSURE_MIN,
> > +					      exposure_max,
> > +					      ov02a10_EXPOSURE_STEP,
> > +					      mode->exp_def);
> > +
> > +	ov02a10->anal_gain = v4l2_ctrl_new_std(handler, &ov02a10_ctrl_ops,
> > +					       V4L2_CID_ANALOGUE_GAIN,
> > +					       ov02a10_GAIN_MIN,
> > +					       ov02a10_GAIN_MAX,
> > +					       ov02a10_GAIN_STEP,
> > +					       ov02a10_GAIN_DEFAULT);
> > +
> > +	ov02a10->test_pattern =
> > +	   v4l2_ctrl_new_std_menu_items(handler,
> > +					&ov02a10_ctrl_ops,
> > +					V4L2_CID_TEST_PATTERN,
> > +					ARRAY_SIZE(ov02a10_test_pattern_menu) -
> > +					1, 0, 0, ov02a10_test_pattern_menu);
> > +
> > +	if (handler->error) {
> > +		ret = handler->error;
> > +		dev_err(&ov02a10->client->dev,
> > +			"Failed to init controls(%d)\n", ret);
> > +		goto err_free_handler;
> > +	}
> > +
> > +	ov02a10->subdev.ctrl_handler = handler;
> > +
> > +	return 0;
> > +
> > +err_free_handler:
> > +	v4l2_ctrl_handler_free(handler);
> > +
> > +	return ret;
> > +}
> > +
> > +static int ov02a10_check_sensor_id(struct ov02a10 *ov02a10,
> > +				   struct i2c_client *client)
> > +{
> > +	struct device *dev = &ov02a10->client->dev;
> > +	u8 pid = 0;
> > +	u8 ver = 0;
> > +	int ret;
> > +
> > +	/* Check sensor revision */
> > +	ret = ov02a10_read_reg(client, OV02A10_REG_CHIP_ID_H, &pid);
> > +	if (!ret)
> > +		ret = ov02a10_read_reg(client, OV02A10_REG_CHIP_ID_L, &ver);
> > +
> > +	if (!ret) {
> > +		unsigned short id;
> > +
> > +		id = OV02A10_ID(pid, ver);
> > +		dev_info(dev, "ov02a10_sensor id(%04x)\n", id);
> dev_dbg

Fixed in next release.

> > +		if (id != CHIP_ID) {
> > +			dev_err(dev, "Unexpected sensor id(%04x), ret(%d)\n",
> > +				id, ret);
> > +			return ret;
> > +		}
> > +		dev_info(dev, "Detected OV%04X sensor\n", id);
> dev_dbg

Fixed in next release.

> > +	}
> > +
> > +	return 0;
> > +}
> > +
> > +static int ov02a10_configure_regulators(struct ov02a10 *ov02a10)
> > +{
> > +	int i;
> > +
> > +	for (i = 0; i < ov02a10_NUM_SUPPLIES; i++)
> > +		ov02a10->supplies[i].supply = ov02a10_supply_names[i];
> > +
> > +	return devm_regulator_bulk_get(&ov02a10->client->dev,
> > +				       ov02a10_NUM_SUPPLIES,
> > +				       ov02a10->supplies);
> > +}
> > +
> > +static int ov02a10_probe(struct i2c_client *client,
> > +			 const struct i2c_device_id *id)
> > +{
> > +	struct device *dev = &client->dev;
> > +	struct ov02a10 *ov02a10;
> > +	u32 rotation;
> > +	int ret;
> > +
> > +	dev_info(dev, "ov02a10 probe ++\n");
> dev_dbg, remove ++

Fixed in next release.

> > +	ov02a10 = devm_kzalloc(dev, sizeof(*ov02a10), GFP_KERNEL);
> > +	if (!ov02a10)
> > +		return -ENOMEM;
> > +
> > +	ov02a10->client = client;
> > +	ov02a10->cur_mode = &supported_modes[0];
> > +
> > +	/* optional indication of physical rotation of sensor */
> > +	ret = fwnode_property_read_u32(dev_fwnode(dev), "rotation",
> > +				       &rotation);
> > +	if (!ret) {
> > +		switch (rotation) {
> > +		case 180:
> > +			ov02a10->upside_down = true;
> > +			/* fall through */
> > +		case 0:
> > +			break;
> > +		default:
> > +			dev_warn(dev, "%u degrees rotation is not supported, ignoring...\n",
> > +				 rotation);
> > +		}
> > +	}
> > +
> > +	ov02a10->xvclk = devm_clk_get(dev, "xvclk");
> > +	if (IS_ERR(ov02a10->xvclk)) {
> > +		dev_err(dev, "Failed to get xvclk\n");
> > +		return -EINVAL;
> > +	}
> > +	ret = clk_set_rate(ov02a10->xvclk, ov02a10_XVCLK_FREQ);
> > +	if (ret < 0) {
> > +		dev_err(dev, "Failed to set xvclk rate (24MHz)\n");
> > +		return ret;
> > +	}
> > +	if (clk_get_rate(ov02a10->xvclk) != ov02a10_XVCLK_FREQ)
> > +		dev_warn(dev, "xvclk mismatched, modes are based on 24MHz\n");
> > +
> > +	ov02a10->pwdn_gpio = devm_gpiod_get(dev, "pwdn", GPIOD_OUT_LOW);
> > +	if (IS_ERR(ov02a10->pwdn_gpio)) {
> > +		dev_err(dev, "Failed to get powerdown-gpios\n");
> > +		return -EINVAL;
> > +	}
> > +
> > +	ov02a10->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
> > +	if (IS_ERR(ov02a10->reset_gpio)) {
> > +		dev_err(dev, "Failed to get reset-gpios\n");
> > +		return -EINVAL;
> > +	}
> > +
> > +	ret = ov02a10_configure_regulators(ov02a10);
> > +	if (ret) {
> > +		dev_err(dev, "Failed to get power regulators\n");
> > +		return ret;
> > +	}
> > +
> > +	mutex_init(&ov02a10->mutex);
> > +	v4l2_i2c_subdev_init(&ov02a10->subdev, client, &ov02a10_subdev_ops);
> > +	ret = ov02a10_initialize_controls(ov02a10);
> > +	if (ret) {
> > +		dev_err(dev, "Failed to initialize controls\n");
> > +		goto err_destroy_mutex;
> > +	}
> > +
> > +	ret = __ov02a10_power_on(ov02a10);
> > +	if (ret) {
> > +		dev_err(dev, "Failed to power on\n");
> > +		goto err_free_handler;
> > +	}
> > +
> > +	ret = ov02a10_check_sensor_id(ov02a10, client);
> > +	if (ret) {
> > +		dev_err(dev, "Failed to detect id, go to power off\n");
> > +		goto err_power_off;
> > +	}
> > +
> > +#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
> > +	ov02a10->subdev.internal_ops = &ov02a10_internal_ops;
> > +	ov02a10->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
> > +#endif
> > +#if defined(CONFIG_MEDIA_CONTROLLER)
> > +	ov02a10->pad.flags = MEDIA_PAD_FL_SOURCE;
> > +	ov02a10->subdev.entity.function = MEDIA_ENT_F_CAM_SENSOR;
> > +	ret = media_entity_pads_init(&ov02a10->subdev.entity, 1, &ov02a10->pad);
> > +	if (ret < 0) {
> > +		dev_err(dev, "Failed init pads\n");
> > +		goto err_power_off;
> > +	}
> > +#endif
> > +
> > +	ret = v4l2_async_register_subdev(&ov02a10->subdev);
> > +	if (ret) {
> > +		dev_err(dev, "v4l2 async register subdev failed\n");
> > +		goto err_clean_entity;
> > +	}
> > +
> > +	pm_runtime_set_active(dev);
> > +	pm_runtime_enable(dev);
> > +	pm_runtime_idle(dev);
> > +	dev_info(dev, "ov02a10 probe --\n");
> dev_dbg, and other dev_info().

Fixed in next release.

> > +
> > +	return 0;
> > +
> > +err_clean_entity:
> > +#if defined(CONFIG_MEDIA_CONTROLLER)
> > +	media_entity_cleanup(&ov02a10->subdev.entity);
> > +#endif
> > +err_power_off:
> > +	__ov02a10_power_off(ov02a10);
> > +err_free_handler:
> > +	v4l2_ctrl_handler_free(&ov02a10->ctrl_handler);
> > +err_destroy_mutex:
> > +	mutex_destroy(&ov02a10->mutex);
> > +
> > +	return ret;
> > +}
> > +
> > +static int ov02a10_remove(struct i2c_client *client)
> > +{
> > +	struct v4l2_subdev *sd = i2c_get_clientdata(client);
> > +	struct ov02a10 *ov02a10 = to_ov02a10(sd);
> > +
> > +	v4l2_async_unregister_subdev(sd);
> > +#if defined(CONFIG_MEDIA_CONTROLLER)
> > +	media_entity_cleanup(&sd->entity);
> > +#endif
> > +	v4l2_ctrl_handler_free(&ov02a10->ctrl_handler);
> > +	mutex_destroy(&ov02a10->mutex);
> > +
> > +	pm_runtime_disable(&client->dev);
> > +	if (!pm_runtime_status_suspended(&client->dev))
> > +		__ov02a10_power_off(ov02a10);
> > +	pm_runtime_set_suspended(&client->dev);
> > +
> > +	return 0;
> > +}
> > +
> > +#if IS_ENABLED(CONFIG_OF)
> > +static const struct of_device_id ov02a10_of_match[] = {
> > +	{ .compatible = "ovti,ov02a10" },
> > +	{},
> > +};
> > +MODULE_DEVICE_TABLE(of, ov02a10_of_match);
> > +#endif
> > +
> > +static struct i2c_driver ov02a10_i2c_driver = {
> > +	.driver = {
> > +		.name = "ov02a10",
> > +		.pm = &ov02a10_pm_ops,
> > +		.of_match_table = of_match_ptr(ov02a10_of_match),
> > +	},
> > +	.probe		= &ov02a10_probe,
> > +	.remove		= &ov02a10_remove,
> > +};
> > +
> > +module_i2c_driver(ov02a10_i2c_driver);
> > +
> > +MODULE_AUTHOR("Dongchun Zhu <dongchun.zhu@mediatek.com>");
> > +MODULE_DESCRIPTION("OmniVision OV02A10 sensor driver");
> > +MODULE_LICENSE("GPL v2");
> > 



^ permalink raw reply	[flat|nested] 14+ messages in thread

* Re: [PATCH 3/3] media: dt-bindings: media: i2c: Add bindings for ov02a10
  2019-05-31 16:16   ` Sakari Ailus
@ 2019-06-13  3:30     ` Dongchun Zhu
  2019-06-14 16:56     ` Rob Herring
  1 sibling, 0 replies; 14+ messages in thread
From: Dongchun Zhu @ 2019-06-13  3:30 UTC (permalink / raw)
  To: Sakari Ailus
  Cc: mchehab, robh+dt, mark.rutland, matthias.bgg, bingbu.cao,
	srv_heupstream, linux-mediatek, linux-arm-kernel, sj.huang,
	linux-media, devicetree, louis.kuo, menghui.lin, shengnan.wang,
	tfiga

Hi Sakari,

On Fri, 2019-05-31 at 19:16 +0300, Sakari Ailus wrote:
> Hi Dongchun,
> 
> Thanks for the patch.
> 
> On Thu, May 23, 2019 at 06:22:04PM +0800, dongchun.zhu@mediatek.com wrote:
> > From: Dongchun Zhu <dongchun.zhu@mediatek.com>
> > 
> > Add device tree binding documentation for the OV02A10 CMOS image sensor.
> > 
> > Signed-off-by: Dongchun Zhu <dongchun.zhu@mediatek.com>
> > ---
> >  .../devicetree/bindings/media/i2c/ov02a10.txt      | 43 ++++++++++++++++++++++
> >  1 file changed, 43 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/media/i2c/ov02a10.txt
> > 
> > diff --git a/Documentation/devicetree/bindings/media/i2c/ov02a10.txt b/Documentation/devicetree/bindings/media/i2c/ov02a10.txt
> > new file mode 100644
> > index 0000000..fdc2904
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/media/i2c/ov02a10.txt
> > @@ -0,0 +1,43 @@
> > +* Omnivision OV02A10 MIPI CSI-2 sensor
> > +
> > +Required Properties:
> > +- compatible: shall be "ovti,ov02a10"
> > +- clocks: reference to the xvclk input clock
> > +- clock-names: shall be "xvclk"
> > +- avdd-supply: Analog voltage supply, 2.8 volts
> > +- dovdd-supply: Digital I/O voltage supply, 1.8 volts
> > +- dvdd-supply: Digital core voltage supply, 1.8 volts
> > +- reset-gpios: Low active reset gpio
> > +
> > +The device node shall contain one 'port' child node with an
> > +'endpoint' subnode for its digital output video port,
> > +in accordance with the video interface bindings defined in
> > +Documentation/devicetree/bindings/media/video-interfaces.txt.
> > +The endpoint optional property 'data-lanes' shall be "<1>".
> 
> If the sensor only supports a single lane configuration (one lane), you can
> omit that property altogether. Is that the only possible configuration for
> the sensor?
> 
> Please also wrap the text at 80 characters, not 65 or so.
> 

Thanks for kind reminder. We would double confirm the lane nums that
sensor can support.
And the issue of text length one line would also be fixed in next
release.

> > +
> > +Example:
> > +&i2c4 {
> > +	sensor_sub: sensor_sub {
> 
> camera-sensor@3d {
> 

Fixed in next release.

> > +		compatible = "ovti,ov02a10";
> > +		reg = <0x3d>;
> > +		pinctrl-names = "default";
> > +		pinctrl-0 = <&camera_pins_cam1_mclk_on>;
> > +
> > +		clocks = <&topckgen CLK_TOP_MUX_CAMTG2>,
> > +			<&topckgen CLK_TOP_UNIVP_192M_D8>;
> > +		clock-names = "xvclk", "freq_mux";
> > +
> > +		avdd-supply = <&mt6358_vcama1_reg>;
> > +		dvdd-supply = <&mt6358_vcn18_reg>;
> > +		dovdd-supply = <&mt6358_vcamio_reg>;
> > +		pwdn-gpios = <&pio 107 1>;
> > +		reset-gpios = <&pio 109 1>;
> > +
> > +		port@0 {
> > +		   ov02a10_core: endpoint {
> > +		       remote-endpoint = <&ov02a10_0>;
> > +			   data-lanes = <1>;
> > +		   };
> 
> Tabs for indentation, please.
> 

Fixed in next release.

> > +		};
> > +	};
> > +};
> 



^ permalink raw reply	[flat|nested] 14+ messages in thread

* Re: [PATCH 3/3] media: dt-bindings: media: i2c: Add bindings for ov02a10
  2019-05-31 16:16   ` Sakari Ailus
  2019-06-13  3:30     ` Dongchun Zhu
@ 2019-06-14 16:56     ` Rob Herring
  1 sibling, 0 replies; 14+ messages in thread
From: Rob Herring @ 2019-06-14 16:56 UTC (permalink / raw)
  To: Sakari Ailus
  Cc: dongchun.zhu, mchehab, mark.rutland, matthias.bgg, bingbu.cao,
	srv_heupstream, linux-mediatek, linux-arm-kernel, sj.huang,
	linux-media, devicetree, louis.kuo, menghui.lin, shengnan.wang

On Fri, May 31, 2019 at 07:16:58PM +0300, Sakari Ailus wrote:
> Hi Dongchun,
> 
> Thanks for the patch.
> 
> On Thu, May 23, 2019 at 06:22:04PM +0800, dongchun.zhu@mediatek.com wrote:
> > From: Dongchun Zhu <dongchun.zhu@mediatek.com>
> > 
> > Add device tree binding documentation for the OV02A10 CMOS image sensor.
> > 
> > Signed-off-by: Dongchun Zhu <dongchun.zhu@mediatek.com>
> > ---
> >  .../devicetree/bindings/media/i2c/ov02a10.txt      | 43 ++++++++++++++++++++++
> >  1 file changed, 43 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/media/i2c/ov02a10.txt
> > 
> > diff --git a/Documentation/devicetree/bindings/media/i2c/ov02a10.txt b/Documentation/devicetree/bindings/media/i2c/ov02a10.txt
> > new file mode 100644
> > index 0000000..fdc2904
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/media/i2c/ov02a10.txt
> > @@ -0,0 +1,43 @@
> > +* Omnivision OV02A10 MIPI CSI-2 sensor
> > +
> > +Required Properties:
> > +- compatible: shall be "ovti,ov02a10"
> > +- clocks: reference to the xvclk input clock
> > +- clock-names: shall be "xvclk"
> > +- avdd-supply: Analog voltage supply, 2.8 volts
> > +- dovdd-supply: Digital I/O voltage supply, 1.8 volts
> > +- dvdd-supply: Digital core voltage supply, 1.8 volts
> > +- reset-gpios: Low active reset gpio
> > +
> > +The device node shall contain one 'port' child node with an
> > +'endpoint' subnode for its digital output video port,
> > +in accordance with the video interface bindings defined in
> > +Documentation/devicetree/bindings/media/video-interfaces.txt.
> > +The endpoint optional property 'data-lanes' shall be "<1>".
> 
> If the sensor only supports a single lane configuration (one lane), you can
> omit that property altogether. Is that the only possible configuration for
> the sensor?
> 
> Please also wrap the text at 80 characters, not 65 or so.
> 
> > +
> > +Example:
> > +&i2c4 {
> > +	sensor_sub: sensor_sub {
> 
> camera-sensor@3d {
> 
> > +		compatible = "ovti,ov02a10";
> > +		reg = <0x3d>;
> > +		pinctrl-names = "default";
> > +		pinctrl-0 = <&camera_pins_cam1_mclk_on>;
> > +
> > +		clocks = <&topckgen CLK_TOP_MUX_CAMTG2>,
> > +			<&topckgen CLK_TOP_UNIVP_192M_D8>;
> > +		clock-names = "xvclk", "freq_mux";
> > +
> > +		avdd-supply = <&mt6358_vcama1_reg>;
> > +		dvdd-supply = <&mt6358_vcn18_reg>;
> > +		dovdd-supply = <&mt6358_vcamio_reg>;
> > +		pwdn-gpios = <&pio 107 1>;
> > +		reset-gpios = <&pio 109 1>;
> > +
> > +		port@0 {

Also, drop the unit-address as there is no 'reg' property. Building your 
dts file will 'W=1' will tell you this.

> > +		   ov02a10_core: endpoint {
> > +		       remote-endpoint = <&ov02a10_0>;
> > +			   data-lanes = <1>;
> > +		   };
> 
> Tabs for indentation, please.
> 
> > +		};
> > +	};
> > +};
> 
> -- 
> Kind regards,
> 
> Sakari Ailus

^ permalink raw reply	[flat|nested] 14+ messages in thread

* Re: [PATCH 1/3] media: i2c: ov02a10: Add ov02a10 camera sensor driver
  2019-06-11 14:09     ` Dongchun Zhu
@ 2019-06-26  9:58       ` Sakari Ailus
  0 siblings, 0 replies; 14+ messages in thread
From: Sakari Ailus @ 2019-06-26  9:58 UTC (permalink / raw)
  To: Dongchun Zhu
  Cc: mchehab, robh+dt, mark.rutland, matthias.bgg, bingbu.cao,
	srv_heupstream, linux-mediatek, linux-arm-kernel, sj.huang,
	linux-media, devicetree, louis.kuo, menghui.lin, shengnan.wang,
	tfiga

Hi Dongchun,

On Tue, Jun 11, 2019 at 10:09:49PM +0800, Dongchun Zhu wrote:
...
> > > +		return -EINVAL;
> > > +
> > > +	fse->code = MEDIA_BUS_FMT_SBGGR10_1X10;
> > 
> > Instead you need check the caller set this. The frame sizes could be
> > different for different media bus formats.
> > 
> 
> For one sensor mode, there should be one Bayer sequence.
> In next version, this para could be changed when mirror/flip enabled.
> 

You should change the check based on the configuration.

...

> > > +#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
> > > +static int ov02a10_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
> > > +{
> > > +	struct ov02a10 *ov02a10 = to_ov02a10(sd);
> > > +	struct v4l2_mbus_framefmt *try_fmt;
> > > +
> > > +	mutex_lock(&ov02a10->mutex);
> > > +
> > > +	try_fmt = v4l2_subdev_get_try_format(sd, fh->pad, 0);
> > > +	/* Initialize try_fmt */
> > > +	ov02a10_fill_fmt(&supported_modes[0], try_fmt);
> > 
> > If this is all you need, you should implement the init_cfg pad op.
> > 
> 
> It seems that other sensors (for instance, OV8856, OV13858 etc.)
> initialize try_fmt in the same way.

Yes; these drivers should be changed as well.

...

> > > +					  ov02a10_test_pattern_val[ctrl->val]);
> > > +		break;
> > > +	case V4L2_CID_HFLIP:
> > > +		if (ov02a10->streaming)
> > > +			return -EBUSY;
> > 
> > You could instead use v4l2_ctrl_grab() (or the unlocked variant) when
> > streaming starts. Same below.
> > 
> 
> It seems that other sensors (for instance, OV2680 etc.)
> call V4L2_CID_HFLIP/V4L2_CID_VFLIP in the same way.

That's ok.

-- 
Regards,

Sakari Ailus

^ permalink raw reply	[flat|nested] 14+ messages in thread

end of thread, back to index

Thread overview: 14+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-05-23 10:22 [PATCH 0/3] media: suppport ov02a10 sensor driver dongchun.zhu
2019-05-23 10:22 ` [PATCH 1/3] media: i2c: ov02a10: Add ov02a10 camera " dongchun.zhu
2019-05-26  8:53   ` Nicolas Boichat
2019-06-13  2:44     ` Dongchun Zhu
2019-05-28  6:20   ` Bingbu Cao
2019-06-13  3:22     ` Dongchun Zhu
2019-05-31 17:03   ` Sakari Ailus
2019-06-11 14:09     ` Dongchun Zhu
2019-06-26  9:58       ` Sakari Ailus
2019-05-23 10:22 ` [PATCH 2/3] media: i2c: ov02a10: Add CONFIG_VIDEO_OV02A10 dongchun.zhu
2019-05-23 10:22 ` [PATCH 3/3] media: dt-bindings: media: i2c: Add bindings for ov02a10 dongchun.zhu
2019-05-31 16:16   ` Sakari Ailus
2019-06-13  3:30     ` Dongchun Zhu
2019-06-14 16:56     ` Rob Herring

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