linux-kernel - Re: [PATCH v4 3/3] iio: light: Add support for ltrf216a sensor

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Message-ID: <a5929558-d09a-cb67-cba9-1dcfb5e43525@gmail.com>
Date:   Fri, 13 May 2022 02:54:08 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Shreeya Patel <shreeya.patel@...labora.com>, jic23@...nel.org,
        lars@...afoo.de, robh+dt@...nel.org, Zhigang.Shi@...eon.com,
        krisman@...labora.com
Cc:     linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel@...labora.com,
        alvaro.soliverez@...labora.com
Subject: Re: [PATCH v4 3/3] iio: light: Add support for ltrf216a sensor

11.05.2022 12:40, Shreeya Patel пишет:
> +static int ltrf216a_init(struct iio_dev *indio_dev)
> +{
> +	int ret;
> +	struct ltrf216a_data *data = iio_priv(indio_dev);
> +
> +	ret = i2c_smbus_read_byte_data(data->client, LTRF216A_MAIN_CTRL);
> +	if (ret < 0) {
> +		dev_err(&data->client->dev, "Error reading LTRF216A_MAIN_CTRL\n");
> +		return ret;
> +	}
> +
> +	/* enable sensor */
> +	ret |= FIELD_PREP(LTRF216A_ALS_ENABLE_MASK, 1);
> +	ret = i2c_smbus_write_byte_data(data->client, LTRF216A_MAIN_CTRL, ret);
> +	if (ret < 0) {
> +		dev_err(&data->client->dev, "Error writing LTRF216A_MAIN_CTRL\n");
> +		return ret;
> +	}

Couldn't you write "1" directly without reading?

What about doing SW reset?