Re: [PATCH v5 2/2] media: i2c: mira016: Add driver for Mira016

[Sakari Ailus]

Hi Jacopo,

One more small issue...

On Wed, Sep 30, 2026 at 12:51:20PM +0200, Jacopo Mondi wrote:

...

> +static int mira016_probe(struct i2c_client *client)
> +{
> +	struct device *dev = &client->dev;
> +	struct mira016 *mira016;
> +	int ret;
> +
> +	mira016 = devm_kzalloc(&client->dev, sizeof(*mira016), GFP_KERNEL);
> +	if (!mira016)
> +		return -ENOMEM;
> +
> +	mira016->dev = &client->dev;
> +
> +	ret = mira016_parse_endpoint(dev, mira016);
> +	if (ret)
> +		return ret;
> +
> +	v4l2_i2c_subdev_init(&mira016->sd, client, &mira016_subdev_ops);
> +
> +	mira016->regmap = devm_cci_regmap_init_i2c(client, 16);
> +	if (IS_ERR(mira016->regmap))
> +		return dev_err_probe(dev, PTR_ERR(mira016->regmap),
> +				     "failed to initialize CCI\n");
> +
> +	mira016->xclk = devm_v4l2_sensor_clk_get(dev, NULL);
> +	if (IS_ERR(mira016->xclk))
> +		return dev_err_probe(dev, PTR_ERR(mira016->xclk),
> +				     "failed to get xclk\n");
> +
> +	mira016->xclk_freq = clk_get_rate(mira016->xclk);
> +	if (mira016_validate_xclk_freq(mira016)) {
> +		dev_err(dev, "xclk frequency not supported: %d Hz\n",
> +			mira016->xclk_freq);
> +		return -EINVAL;
> +	}
> +
> +	ret = mira016_get_regulators(mira016);
> +	if (ret)
> +		return dev_err_probe(dev, ret, "failed to get regulators\n");
> +
> +	mira016->reset_gpio = devm_gpiod_get_optional(dev, "reset",
> +						      GPIOD_OUT_HIGH);
> +	if (IS_ERR(mira016->reset_gpio))
> +		return dev_err_probe(dev, PTR_ERR(mira016->reset_gpio),
> +				     "failed to get reset gpio\n");
> +
> +	/*
> +	 * Calculate the PLL configuration based on the link frequency
> +	 * selected by .dts and compute the sensor timing bases.
> +	 *
> +	 * Initialize row_length to a value matching the default format for
> +	 * exposure and frame time limits calculations.
> +	 */
> +	mira016_pll_calc(mira016);
> +	mira016_timings_calc(mira016);
> +	mira016->timings.row_length = 1262;
> +
> +	ret = mira016_power_on(dev);
> +	if (ret)
> +		return ret;
> +
> +	/* Enable runtime PM and power on the device */
> +	pm_runtime_set_active(dev);
> +	pm_runtime_enable(dev);
> +
> +	ret = mira016_identify_module(mira016);
> +	if (ret)
> +		goto error_power_off;
> +
> +	ret = mira016_init_controls(mira016);
> +	if (ret)
> +		goto error_power_off;
> +
> +	/* Initialize subdev */
> +	mira016->sd.internal_ops = &mira016_internal_ops;
> +	mira016->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
> +	mira016->sd.entity.function = MEDIA_ENT_F_CAM_SENSOR;
> +
> +	/* Initialize source pads */
> +	mira016->pad.flags = MEDIA_PAD_FL_SOURCE;
> +
> +	ret = media_entity_pads_init(&mira016->sd.entity, 1, &mira016->pad);
> +	if (ret) {
> +		dev_err_probe(dev, ret, "failed to init entity pads\n");
> +		goto error_handler_free;
> +	}
> +
> +	mira016->sd.state_lock = mira016->ctrl_handler.lock;
> +	ret = v4l2_subdev_init_finalize(&mira016->sd);
> +	if (ret < 0) {
> +		dev_err_probe(dev, ret, "subdev init error\n");
> +		goto error_media_entity;
> +	}
> +
> +	ret = v4l2_async_register_subdev_sensor(&mira016->sd);
> +	if (ret < 0) {
> +		dev_err_probe(dev, ret,
> +			      "failed to register sensor sub-device\n");
> +		goto error_subdev_cleanup;
> +	}
> +
> +	pm_runtime_set_autosuspend_delay(dev, 1000);
> +	pm_runtime_use_autosuspend(dev);
> +	pm_runtime_idle(dev);
> +
> +	return 0;
> +
> +error_subdev_cleanup:
> +	v4l2_subdev_cleanup(&mira016->sd);
> +error_media_entity:
> +	media_entity_cleanup(&mira016->sd.entity);
> +error_handler_free:
> +	v4l2_ctrl_handler_free(mira016->sd.ctrl_handler);
> +error_power_off:
> +	pm_runtime_disable(dev);
> +	if (!pm_runtime_status_suspended(&client->dev))
> +		mira016_power_off(dev);
> +	pm_runtime_set_suspended(dev);

These two come in pairs effectively. The sensor has been powered on earlier
and not powered off, so you can omit the suspended check above.

> +	return ret;
> +}

-- 
Regards,

Sakari Ailus