Re: [RFC,V2,2/2] media: i2c: Add Omnivision OV02A10 camera sensor driver

[Dongchun Zhu <dongchun.zhu@mediatek.com>]

Hi Bingbu,

On Tue, 2019-07-08 at 15:52 +0800, Bingbu Cao wrote:
> -----Original Message-----
> From: Linux-mediatek [mailto:linux-mediatek-bounces@lists.infradead.org] On Behalf Of Bingbu Cao
> Sent: Monday, July 08, 2019 3:53 PM
> To: Dongchun Zhu (朱东春) <Dongchun.Zhu@mediatek.com>; mchehab@kernel.org; robh+dt@kernel.org; mark.rutland@arm.com; sakari.ailus@linux.intel.com; --to=drinkcat@chromium.org; tfiga@chromium.org; matthias.bgg@gmail.com; bingbu.cao@intel.com
> Cc: devicetree@vger.kernel.org; srv_heupstream <srv_heupstream@mediatek.com>; Shengnan Wang (王圣男) <shengnan.wang@mediatek.com>; Sj Huang (黃信璋) <sj.huang@mediatek.com>; linux-mediatek@lists.infradead.org; Louis Kuo (郭德寧) <louis.kuo@mediatek.com>; linux-arm-kernel@lists.infradead.org; linux-media@vger.kernel.org
> Subject: Re: [RFC,V2,2/2] media: i2c: Add Omnivision OV02A10 camera sensor driver
> 
> 
> 
> On 7/4/19 4:46 PM, dongchun.zhu@mediatek.com wrote:
> > From: Dongchun Zhu <dongchun.zhu@mediatek.com>
> >
> > This patch adds a V4L2 sub-device driver for OV02A10 image sensor.
> > The OV02A10 is a 1/5" CMOS sensor from Omnivision.
> > Supports output format: 10-bit Raw.
> > The OV02A10 has a single MIPI lane interface and use the I2C bus for control and the CSI-2 bus for data.
> >
> > Signed-off-by: Dongchun Zhu <dongchun.zhu@mediatek.com>
> >
> snip
> > +
> > +/* MIPI color bar enable output */
> > +static const struct regval ov02a10_test_pattern_enable_regs[] = {
> > +{0xfd, 0x01},
> > +{0x0d, 0x00},
> > +{0xb6, 0x01},
> > +{0x01, 0x01},
> > +{0xfd, 0x01},
> > +{0xac, 0x01},
> > +{REG_NULL, 0x00}
> Actually, you can use ARRAY_SIZE to write the regs, the REG_NULL can be removed. However, it is not a problem.
> ...
> snip...

Thanks for kindly reminder.
It would remain, just as OV5695/OV2685 did.

> > +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;
> > +int ret = 0;
> > +
> > +mutex_lock(&ov02a10->mutex);
> > +
> > +if (ov02a10->streaming) {
> > +ret = -EBUSY;
> > +goto unlock;
> I like return -EBUSY directly after mutex_unlock here and return 0 below.

Got it.
Fixed in next release.

> > +}
> > +
> > +/* only one mode supported */
> > +mbus_fmt->code = ov02a10->fmt.code;
> > +ov02a10_fill_fmt(ov02a10->cur_mode, mbus_fmt);
> > +ov02a10->fmt = fmt->format;
> > +
> > +unlock:
> > +mutex_unlock(&ov02a10->mutex);
> > +
> > +return ret;
> > +}
> > +
> > +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;
> > +
> > +mutex_lock(&ov02a10->mutex);
> > +
> > +fmt->format = ov02a10->fmt;
> > +mbus_fmt->code = ov02a10->fmt.code;
> > +ov02a10_fill_fmt(ov02a10->cur_mode, mbus_fmt);
> > +
> > +mutex_unlock(&ov02a10->mutex);
> > +
> > +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) {
> > +struct ov02a10 *ov02a10 = to_ov02a10(sd);
> > +
> > +if (code->index >= ARRAY_SIZE(supported_modes) || !(code->index))
> > +return -EINVAL;
> > +
> > +code->code = ov02a10->fmt.code;
> > +
> > +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) {
> > +if (fse->index >= ARRAY_SIZE(supported_modes) || !(fse->index))
> > +return -EINVAL;
> > +
> > +fse->min_width  = supported_modes[fse->index].width;
> > +fse->max_width  = supported_modes[fse->index].width;
> > +fse->max_height = supported_modes[fse->index].height;
> > +fse->min_height = supported_modes[fse->index].height;
> > +
> > +return 0;
> > +}
> > +
> > +static int __ov02a10_power_on(struct ov02a10 *ov02a10) {
> > +struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
> > +struct device *dev = &client->dev;
> > +int ret;
> > +
> > +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;
> > +}
> > +msleep_range(7);
> > +
> > +gpiod_set_value_cansleep(ov02a10->pwdn_gpio, 1);
> > +msleep_range(10);
> > +
> > +gpiod_set_value_cansleep(ov02a10->reset_gpio, 0);
> > +msleep_range(10);
> > +
> > +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) {
> > +struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
> > +int ret;
> > +
> > +/* Apply default values of current mode */
> > +ret = ov02a10_write_array(ov02a10, ov02a10->cur_mode->reg_list);
> > +if (ret)
> > +return ret;
> > +
> > +/* Apply customized values from user */
> > +ret = __v4l2_ctrl_handler_setup(ov02a10->subdev.ctrl_handler);
> > +if (ret)
> > +return ret;
> > +
> > +/* Set Orientation be 180 degree */
> Set orientation to 180 degree

Got it.
Fixed in next release.

> > +if (ov02a10->upside_down) {
> > +ret = ov02a10_write_reg(ov02a10, REG_MIRROR_FLIP_CONTROL,
> > +REG_CONFIG_MIRROR_FLIP);
> > +if (ret) {
> > +dev_err(&client->dev, "%s failed to set orientation\n",
> > +__func__);
> > +return ret;
> > +}
> > +ret = ov02a10_write_reg(ov02a10, REG_GLOBAL_EFFECTIVE,
> > +REG_ENABLE);
> > +if (ret < 0)
> > +return ret;
> > +}
> > +
> > +/* set stream on register */
> > +return ov02a10_write_reg(ov02a10,
> > + REG_SC_CTRL_MODE, SC_CTRL_MODE_STREAMING); }
> > +
> > +static int __ov02a10_stop_stream(struct ov02a10 *ov02a10) {
> > +return ov02a10_write_reg(ov02a10,
> > + REG_SC_CTRL_MODE, SC_CTRL_MODE_STANDBY); }
> > +
> > +static int ov02a10_entity_init_cfg(struct v4l2_subdev *subdev,
> > +   struct v4l2_subdev_pad_config *cfg) {
> > +struct v4l2_subdev_format fmt = { 0 };
> > +
> > +fmt.which = cfg ? V4L2_SUBDEV_FORMAT_TRY : V4L2_SUBDEV_FORMAT_ACTIVE;
> > +fmt.format.width = 1600;
> > +fmt.format.height = 1200;
> > +
> > +ov02a10_set_fmt(subdev, cfg, &fmt);
> > +
> > +return 0;
> > +}
> > +
> > +static int ov02a10_s_stream(struct v4l2_subdev *sd, int on) {
> > +struct ov02a10 *ov02a10 = to_ov02a10(sd);
> > +struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
> > +int ret = 0;
> > +
> > +dev_dbg(&client->dev, "ov02a10 s_stream (%d)\n", on);
> > +mutex_lock(&ov02a10->mutex);
> > +
> > +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) {
> > +__ov02a10_stop_stream(ov02a10);
> > +ov02a10->streaming = !on;
> > +goto err_rpm_put;
> > +}
> > +} else {
> > +__ov02a10_stop_stream(ov02a10);
> > +pm_runtime_put(&client->dev);
> > +}
> > +
> > +ov02a10->streaming = on;
> > +mutex_unlock(&ov02a10->mutex);
> > +
> > +return ret;
> > +
> > +err_rpm_put:
> > +pm_runtime_put(&client->dev);
> > +unlock_and_return:
> > +mutex_unlock(&ov02a10->mutex);
> > +
> > +return ret;
> > +}
> > +
> > +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 = v4l2_subdev_get_try_format(sd,
> > +fh->pad,
> > +0);
> > +
> > +mutex_lock(&ov02a10->mutex);
> > +/* Initialize try_fmt */
> > +try_fmt->code = ov02a10->fmt.code;
> > +ov02a10_fill_fmt(&supported_modes[0], try_fmt);
> > +
> > +mutex_unlock(&ov02a10->mutex);
> > +
> > +return 0;
> > +}
> > +
> > +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);
> > +
> > +__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_set_test_pattern(struct ov02a10 *ov02a10, s32
> > +value) {
> > +if (value)
> > +return ov02a10_write_array(ov02a10,
> > +   ov02a10_test_pattern_enable_regs);
> > +
> > +return ov02a10_write_array(ov02a10,
> > +ov02a10_test_pattern_disable_regs);
> > +}
> > +
> > +static int ov02a10_set_ctrl(struct v4l2_ctrl *ctrl) {
> > +struct ov02a10 *ov02a10 = container_of(ctrl->handler,
> > +     struct ov02a10, ctrl_handler);
> > +struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
> > +s64 max_expo;
> > +int ret;
> > +
> > +/* Propagate change of current control to all related controls */
> > +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);
> > +}
> > +
> > +/* V4L2 controls values will be applied only when power is already up */
> > +if (!pm_runtime_get_if_in_use(&client->dev))
> > +return 0;
> > +
> > +switch (ctrl->id) {
> > +case V4L2_CID_EXPOSURE:
> > +ret = ov02a10_write_reg(ov02a10, REG_PAGE_SWITCH, REG_ENABLE);
> > +if (ret < 0)
> > +return ret;
> > +ret = ov02a10_write_reg(ov02a10, OV02A10_REG_EXPOSURE_H,
> > +((ctrl->val >> 8) & 0xFF));
> > +if (!ret) {
> > +ret = ov02a10_write_reg(ov02a10, OV02A10_REG_EXPOSURE_L,
> > +(ctrl->val & 0xFF));
> > +if (ret < 0)
> > +return ret;
> > +}
> > +ret = ov02a10_write_reg(ov02a10, REG_GLOBAL_EFFECTIVE,
> > +REG_ENABLE);
> > +if (ret < 0)
> > +return ret;
> > +break;
> > +case V4L2_CID_ANALOGUE_GAIN:
> > +ret = ov02a10_write_reg(ov02a10, REG_PAGE_SWITCH, REG_ENABLE);
> > +if (ret < 0)
> > +return ret;
> > +ret = ov02a10_write_reg(ov02a10, OV02A10_REG_GAIN,
> > +(ctrl->val & 0xFF));
> > +if (ret < 0)
> > +return ret;
> > +ret = ov02a10_write_reg(ov02a10, REG_GLOBAL_EFFECTIVE,
> > +REG_ENABLE);
> > +if (ret < 0)
> > +return ret;
> > +break;
> > +case V4L2_CID_VBLANK:
> > +ret = ov02a10_write_reg(ov02a10, REG_PAGE_SWITCH, REG_ENABLE);
> > +if (ret < 0)
> > +return ret;
> > +ret = ov02a10_write_reg(ov02a10, OV02A10_REG_VTS_H,
> > +(((ctrl->val +
> > +ov02a10->cur_mode->height - 1224) >> 8)
> > +& 0xFF));
> 1224 is hard-coded here, could you add some comments? Is it a sensor setting sensitive value?

This would be fixed in next release.
1224 is the basic line for OV02a10 CMOS sensor.
In fact, there is one relationship between framelength and v-blanking.
That is, framelength = basic_line + v-blanking.
Thus we could modify the value of v-blanking register to update
framelength.

> > +if (!ret) {
> > +ret = ov02a10_write_reg(ov02a10, OV02A10_REG_VTS_L,
> > +((ctrl->val +
> > +ov02a10->cur_mode->height -
> > +1224) & 0xFF));
> ditto.

Fixed in next release.

> > +if (ret < 0)
> > +return ret;
> > +}
> > +ret = ov02a10_write_reg(ov02a10, REG_GLOBAL_EFFECTIVE,
> > +REG_ENABLE);
> > +if (ret < 0)
> > +return ret;
> > +break;
> > +case V4L2_CID_TEST_PATTERN:
> > +ret = ov02a10_set_test_pattern(ov02a10, ctrl->val);
> > +if (ret < 0)
> > +return ret;
> > +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 = {
> > +.init_cfg = ov02a10_entity_init_cfg,
> > +.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,
> > +};
> > +
> > +static const struct media_entity_operations ov02a10_subdev_entity_ops = {
> > +.link_validate = v4l2_subdev_link_validate, };
> > +
> > +static const struct v4l2_subdev_internal_ops ov02a10_internal_ops = {
> > +.open = ov02a10_open,
> > +};
> > +
> > +static const struct v4l2_ctrl_ops ov02a10_ctrl_ops = {
> > +.s_ctrl = ov02a10_set_ctrl,
> > +};
> > +
> > +static int ov02a10_initialize_controls(struct ov02a10 *ov02a10) {
> > +struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
> > +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, 10);
> > +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(&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 = v4l2_get_subdevdata(&ov02a10->subdev);
> > +u16 id;
> > +u8 pid = 0;
> > +u8 ver = 0;
> > +int ret;
> > +
> > +/* Check sensor revision */
> > +ret = ov02a10_read_reg(ov02a10, OV02A10_REG_CHIP_ID_H, &pid);
> > +if (ret)
> > +return ret;
> > +
> > +ret = ov02a10_read_reg(ov02a10, OV02A10_REG_CHIP_ID_L, &ver);
> > +if (ret)
> > +return ret;
> > +
> > +id = OV02A10_ID(pid, ver);
> > +if (id != CHIP_ID) {
> > +dev_err(&client->dev, "Unexpected sensor id(%04x)\n", id);
> > +return ret;
> > +}
> > +dev_dbg(&client->dev, "Detected OV%04X sensor\n", id);
> > +
> > +return 0;
> > +}
> > +
> > +static int ov02a10_configure_regulators(struct ov02a10 *ov02a10) {
> > +struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev);
> > +unsigned int i;
> > +
> > +for (i = 0; i < OV02A10_NUM_SUPPLIES; i++)
> > +ov02a10->supplies[i].supply = ov02a10_supply_names[i];
> > +
> > +return devm_regulator_bulk_get(&client->dev,
> > +       OV02A10_NUM_SUPPLIES,
> > +       ov02a10->supplies);
> > +}
> > +
> > +static int ov02a10_probe(struct i2c_client *client) {
> > +struct device *dev = &client->dev;
> > +struct ov02a10 *ov02a10;
> > +u32 rotation;
> > +u32 xclk_freq;
> > +int ret;
> > +
> > +dev_dbg(dev, "ov02a10 probe\n");
> I think this line is not needed at all.

Removed in next release.

> > +ov02a10 = devm_kzalloc(dev, sizeof(*ov02a10), GFP_KERNEL);
> > +if (!ov02a10)
> > +return -ENOMEM;
> > +
> > +v4l2_i2c_subdev_init(&ov02a10->subdev, client, &ov02a10_subdev_ops);
> > +ov02a10->fmt.code = MEDIA_BUS_FMT_SBGGR10_1X10;
> > +
> > +/* 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;
> > +ov02a10->fmt.code = MEDIA_BUS_FMT_SRGGB10_1X10;
> > +break;
> > +case 0:
> > +break;
> > +default:
> > +dev_warn(dev, "%u degrees rotation is not supported, ignoring...\n",
> > + rotation);
> > +}
> > +}
> > +
> > +/* get system clock (xvclk) */
> > +ov02a10->xvclk = devm_clk_get(dev, "xvclk");
> > +if (IS_ERR(ov02a10->xvclk)) {
> > +dev_err(dev, "Failed to get xvclk\n");
> > +return -EINVAL;
> > +}
> > +
> > +ret = of_property_read_u32(dev->of_node, "clock-frequency", &xclk_freq);
> > +if (ret) {
> > +dev_err(dev, "Failed to get xclk frequency\n");
> > +return ret;
> > +}
> > +
> > +/* external clock must be 24MHz, allow 1% tolerance */
> > +if (xclk_freq < 23760000 || xclk_freq > 24240000) {
> > +dev_err(dev, "external clock frequency %u is not supported\n",
> > +xclk_freq);
> > +return -EINVAL;
> > +}
> > +dev_dbg(dev, "external clock frequency %u\n", xclk_freq);
> > +
> > +ret = clk_set_rate(ov02a10->xvclk, xclk_freq);
> > +if (ret) {
> > +dev_err(dev, "Failed to set xvclk frequency (24MHz)\n");
> > +return ret;
> > +}
> > +
> > +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);
> > +ov02a10->cur_mode = &supported_modes[0];
> > +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)
> > +goto err_free_handler;
> > +
> > +ret = ov02a10_check_sensor_id(ov02a10);
> > +if (ret)
> > +goto err_power_off;
> > +
> > +ov02a10->subdev.internal_ops = &ov02a10_internal_ops;
> > +ov02a10->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
> > +ov02a10->subdev.entity.ops = &ov02a10_subdev_entity_ops;
> > +ov02a10->subdev.entity.function = MEDIA_ENT_F_CAM_SENSOR;
> > +ov02a10->pad.flags = MEDIA_PAD_FL_SOURCE;
> > +ret = media_entity_pads_init(&ov02a10->subdev.entity, 1, &ov02a10->pad);
> > +if (ret < 0) {
> > +dev_err(dev, "failed to init entity pads: %d", ret);
> > +goto err_power_off;
> > +}
> > +
> > +ret = v4l2_async_register_subdev(&ov02a10->subdev);
> > +if (ret) {
> > +dev_err(dev, "failed to register V4L2 subdev: %d",
> > +ret);
> > +goto err_clean_entity;
> > +}
> > +
> > +pm_runtime_set_active(dev);
> > +pm_runtime_enable(dev);
> > +pm_runtime_idle(dev);
> > +
> > +return 0;
> > +
> > +err_clean_entity:
> > +media_entity_cleanup(&ov02a10->subdev.entity);
> > +err_power_off:
> > +__ov02a10_power_off(ov02a10);
> > +err_free_handler:
> > +v4l2_ctrl_handler_free(ov02a10->subdev.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);
> > +media_entity_cleanup(&sd->entity);
> > +v4l2_ctrl_handler_free(sd->ctrl_handler);
> > +pm_runtime_disable(&client->dev);
> > +if (!pm_runtime_status_suspended(&client->dev))
> > +__ov02a10_power_off(ov02a10);
> > +pm_runtime_set_suspended(&client->dev);
> > +mutex_destroy(&ov02a10->mutex);
> > +
> > +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 = ov02a10_of_match,
> > +},
> > +.probe_new= &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");
> > +
> >
> Other part looks good to me.

Many thanks for your review.
I really appreciate the effort you all made for the work.

> 
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