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Date:   Fri, 13 May 2022 02:41:23 +0300
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Subject: Re: [PATCH v4 3/3] iio: light: Add support for ltrf216a sensor
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To:     Shreeya Patel <shreeya.patel@collabora.com>, jic23@kernel.org,
        lars@metafoo.de, robh+dt@kernel.org, Zhigang.Shi@liteon.com,
        krisman@collabora.com
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        linux-kernel@vger.kernel.org, kernel@collabora.com,
        alvaro.soliverez@collabora.com
References: <20220511094024.175994-1-shreeya.patel@collabora.com>
 <20220511094024.175994-4-shreeya.patel@collabora.com>
From:   Dmitry Osipenko <digetx@gmail.com>
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11.05.2022 12:40, Shreeya Patel пишет:
> +static int ltrf216a_probe(struct i2c_client *client)
> +{
> +	struct ltrf216a_data *data;
> +	struct iio_dev *indio_dev;
> +	int ret;
> +
> +	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
> +	if (!indio_dev)
> +		return -ENOMEM;
> +
> +	data = iio_priv(indio_dev);
> +	i2c_set_clientdata(client, indio_dev);
> +	data->client = client;
> +
> +	mutex_init(&data->mutex);
> +
> +	indio_dev->info = &ltrf216a_info;
> +	indio_dev->name = LTRF216A_DRV_NAME;
> +	indio_dev->channels = ltrf216a_channels;
> +	indio_dev->num_channels = ARRAY_SIZE(ltrf216a_channels);
> +	indio_dev->modes = INDIO_DIRECT_MODE;
> +
> +	ret = ltrf216a_init(indio_dev);
> +	if (ret < 0)
> +		return dev_err_probe(&client->dev, ret,
> +				     "ltrf216a chip init failed\n");

Is it possible to enable sensor only when measurement is made for more
power savings? Light sensor shouldn't consume much power, but nevertheless.

You'll need to add msleep(power_on_delay + resolution_rate_delay) after
enabling sensor and before reading the measurement to wait until
measurement is made by h/w.