linux-kernel - Re: [PATCH V2] iio: magnetometer: mag3110: add optional vdd/vddio regulator operation support

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Date:   Mon, 10 Dec 2018 07:55:19 -0200
From:   Fabio Estevam <festevam@...il.com>
To:     Yongcai Huang <anson.huang@....com>
Cc:     Jonathan Cameron <jic23@...nel.org>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald <pmeerw@...erw.net>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>, linux-iio@...r.kernel.org,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        NXP Linux Team <linux-imx@....com>
Subject: Re: [PATCH V2] iio: magnetometer: mag3110: add optional vdd/vddio
 regulator operation support

Hi Anson,

On Mon, Dec 10, 2018 at 5:17 AM Anson Huang <anson.huang@....com> wrote:

> +       data->vdd_reg = devm_regulator_get_optional(&client->dev, "vdd");
> +       if (!IS_ERR(data->vdd_reg)) {
> +               ret = regulator_enable(data->vdd_reg);
> +               if (ret) {
> +                       dev_err(&client->dev, "failed to enable VDD regulator\n");
> +                       return ret;
> +               }
> +       } else if (data->vdd_reg == ERR_PTR(-EPROBE_DEFER)) {
> +               return -EPROBE_DEFER;
> +       }
> +
> +       data->vddio_reg = devm_regulator_get_optional(&client->dev, "vddio");
> +       if (!IS_ERR(data->vddio_reg)) {
> +               ret = regulator_enable(data->vddio_reg);
> +               if (ret) {
> +                       dev_err(&client->dev, "failed to enable VDDIO regulator\n");
> +                       return ret;

In the case of error you should disable the vdd_reg regulator.

> +               }
> +       } else if (data->vddio_reg == ERR_PTR(-EPROBE_DEFER)) {
> +               return -EPROBE_DEFER;
> +       }
> +
>         ret = i2c_smbus_read_byte_data(client, MAG3110_WHO_AM_I);
>         if (ret < 0)
>                 return ret;

and here you should disable vddio_reg.