Re: [PATCH V2 2/2] iio: accell: mma8452: add optional vdd/vddio regulator operation support

[Fabio Estevam]

On Mon, Dec 10, 2018 at 5:25 AM Anson Huang <anson.huang@xxxxxxx> wrote:

> @@ -1533,6 +1536,27 @@ static int mma8452_probe(struct i2c_client *client,
>         data->client = client;
>         mutex_init(&data->lock);
>         data->chip_info = match->data;
> +       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;

As mentioned in your other patch: you should disable the previously
enabled regulator in the error path.